CASTELLE \CA\
424B1, 1996-11-12
COMPUTER PERIPHERAL EQUIPMENT, NEC
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November 6, 1996


VIA EDGAR

Securities and Exchange Commission
450 Fifth Street, N.W.
Judiciary Plaza
Washington, D.C. 20549
Attn:  Filing Desk

Re:      Castelle
         Registration Statement on Form S-4, File No. 333-14815

Ladies and Gentlemen:

Enclosed  for filing on behalf of  Castelle,  pursuant to Rule  424(b)(1) of the
Securities Act of 1933, as amended,  is the final  prospectus used in connection
with the above-referenced offering.

Sincerely,

CASTELLE



By:/s/ Randall I. Bambrough
Randall I. Bambrough
Chief Financial Officer






<PAGE>
                                                FILED PURSUANT TO RULE 424(b)(1)
                                                              FILE NO. 333-14815



CASTELLE                                                 IBEX TECHNOLOGIES, INC.

                        PROSPECTUS/JOINT PROXY STATEMENT

     This Prospectus/Joint Proxy Statement (the "Prospectus") is being furnished
to the  shareholders of Castelle in connection with the  solicitation of proxies
by the  Castelle  Board of Directors  for use at the Annual  Meeting of Castelle
shareholders  (the "Castelle  Meeting") to be held at 9:00 a.m.,  local time, on
Tuesday, November 19, 1996, at 3255-3 Scott Boulevard,  Santa Clara, California,
and at any adjournments or postponements of the Castelle Meeting.

     This  Prospectus  is  also  being  furnished  to the  shareholders  of Ibex
Technologies,  Inc. ("Ibex"),  in connection with the solicitation of proxies by
the Ibex Board of Directors for use at the Special Meeting of Ibex  shareholders
(the "Ibex Meeting") to be held at 10:00 a.m.,  local time, on Monday,  November
18, 1996, at 4921 R.J. Mathews Parkway, El Dorado Hills, California,  and at any
adjournments or postponements of the Ibex Meeting.

This Prospectus/Joint Proxy Statement constitutes the Prospectus of Castelle for
use in  connection  with the offer and  issuance of up to 850,000  shares  (less
shares reserved for issuance to Ibex shareholders who have perfected dissenters'
rights and shares  reserved for issuance  upon the exercise of Ibex  Options) of
Common Stock, no par value, of Castelle  ("Castelle  Common Stock") (the "Merger
Shares"),  pursuant to the merger of Ibex into  Castelle  (referred to herein as
the "Merger") as provided under the Agreement and Plan of  Reorganization  dated
as of August 22, 1996 (the "Merger Agreement") among Castelle,  Ibex and certain
shareholders  of Ibex (the  "Signing  Shareholders").  "Ibex  Options" are those
options to purchase Ibex Common Stock  outstanding  as of the effective  time of
the Merger which shall be converted into options to purchase  shares of Castelle
Common Stock. In the event the closing price of a share of Castelle Common Stock
on the business day  immediately  preceding the effective  time of the Merger is
$9.42 or greater, each share of Common Stock of Ibex, no par value ("Ibex Common
Stock") and each share of Series A  Convertible  Preferred  Stock of Ibex ("Ibex
Preferred  Stock")  outstanding  immediately  prior to the effective time of the
Merger shall be converted  into the right to receive  4.17731 shares of Castelle
Common Stock. In the event the closing price of a share of Castelle Common Stock
on the business day  immediately  preceding the effective  time of the Merger is
less than $9.42,  each share of Ibex  Preferred  Stock  outstanding  immediately
prior to the effective time of the Merger shall receive a pro rata allocation of
shares of Castelle  Common  Stock with a fair market  value on the  business day
immediately  preceding  the  effective  time  of the  Merger  of  $180,000  (the
"Preferred Stock  Preference").  Holders of Ibex Preferred Stock and Ibex Common
Stock  shall  share in a pro rata  distribution,  based on the  total  number of
shares held, of the Merger Shares  remaining  after  allocation of the Preferred
Stock Preference.

     On October 31, 1996, the closing  sales price on the Nasdaq National Market
of Castelle Common Stock was $6.00 per share.

     This Prospectus and the accompanying  forms of proxy are first being mailed
to shareholders of Castelle and Ibex on or about November 7, 1996.

                                 ---------------



                                       1.

<PAGE>




THE ABOVE  MATTERS ARE  DISCUSSED  IN DETAIL IN THIS  PROSPECTUS.  THE  PROPOSED
MERGER IS A COMPLEX  TRANSACTION.  SHAREHOLDERS  OF BOTH  CASTELLE  AND IBEX ARE
STRONGLY URGED TO READ AND CONSIDER  CAREFULLY THIS  PROSPECTUS IN ITS ENTIRETY,
PARTICULARLY THE MATTERS REFERRED TO UNDER "RISK FACTORS."
                                 ---------------

THE  SECURITIES TO BE ISSUED IN THE MERGER HAVE NOT BEEN APPROVED OR DISAPPROVED
BY THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR
HAS THE SECURITIES AND EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION
PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.  ANY  REPRESENTATION TO
THE CONTRARY IS A CRIMINAL OFFENSE.
                                 ---------------

                The date of this Prospectus is November 7, 1996.



                                       2.

<PAGE>
<TABLE>
<CAPTION>



                                TABLE OF CONTENTS

                                                                                                               Page

<S>                                                                                                               <C>
AVAILABLE INFORMATION...........................................................................................  1

SUMMARY  .......................................................................................................  3
         The Companies..........................................................................................  3
         Meetings of Shareholders...............................................................................  3
         Opinion of Financial Advisor...........................................................................  5
         Recommendations of Boards of Directors.................................................................  5
         The Merger.............................................................................................  5
         Benefits to Ibex Executives and Shareholders from Merger............................................... 10
         Additional Proposals for Castelle Shareholders......................................................... 13
         Additional Proposal for Ibex Shareholders.............................................................. 13
         Market Price Data...................................................................................... 14
         Selected Historical And Pro Forma Financial Data....................................................... 15
         Castelle Consolidated Selected Financial Data.......................................................... 16
         Ibex Selected Financial Data........................................................................... 18
         Unaudited Selected Pro Forma Combined Financial Data................................................... 19
         Comparative Per Share Data............................................................................. 20

RISK FACTORS.................................................................................................... 21
         Castelle:  History of Losses; Accumulated Deficit...................................................... 21
         Fluctuations in Operating Results...................................................................... 21
         Rapid Technological Change; Risks Associated with New Products......................................... 22
         Key Personnel.......................................................................................... 23
         Product Transition; Risk of Product Returns and Inventory Obsolescence................................. 23
         Competition and Price Erosion.......................................................................... 24
         Combination of the Companies; Possible Adverse Effect on Financial Results............................. 25
         Castelle:  Concentration of Distributors; Distribution Risks........................................... 25
         Lack of Product Revenue Diversification................................................................ 26
         Dependence on Suppliers and Subcontractors............................................................. 26
         Castelle:  Government Regulation....................................................................... 27
         Ibex:  Dependence on Distribution Partners; Distribution Risks......................................... 27
         International Sales.................................................................................... 27
         Dependence on Proprietary Rights; Uncertainty of Obtaining Licenses.................................... 28
         Possible Volatility of Castelle Stock Price............................................................ 29
         Castelle:  Future Capital Requirements................................................................. 29
         Castelle:  Voting Control by Officers, Directors and Affiliates........................................ 30
         Castelle:  Certain Charter Provisions.................................................................. 30
         Shares Eligible for Future Sale........................................................................ 30

RECENT DEVELOPMENTS............................................................................................. 31
         Litigation............................................................................................. 31


</TABLE>

                                       i.

<PAGE>

<TABLE>
<CAPTION>



                                TABLE OF CONTENTS
                                   (continued)
                                                                                                               Page

<S>                                                                                                              <C>
THE CASTELLE MEETING............................................................................................ 32
         Date, Time and Place of Meeting........................................................................ 32
         Record Date, Voting Rights and Outstanding Shares...................................................... 32
         Voting of Proxies...................................................................................... 32
         Vote Required.......................................................................................... 33
         Quorum; Abstentions; Broker Non-Votes.................................................................. 33
         Solicitation of Proxies and Expenses................................................................... 33
         Board Recommendations.................................................................................. 33

THE IBEX MEETING................................................................................................ 34
         Date, Time and Place................................................................................... 34
         Solicitation of Proxies................................................................................ 34
         Record Date and Outstanding Shares..................................................................... 34
         Vote Required.......................................................................................... 34
         Quorum; Abstentions.................................................................................... 34
         Voting of Proxies...................................................................................... 35
         Solicitation of Proxies and Expenses................................................................... 35
         Board Recommendations.................................................................................. 35

THE MERGER AND RELATED TRANSACTIONS............................................................................. 36
         General  .............................................................................................. 36
         Background of the Merger............................................................................... 39
         Reasons for the Merger................................................................................. 40
         Board Recommendation................................................................................... 43
         Opinion of Financial Advisor to Castelle............................................................... 43
         Related Agreements..................................................................................... 46
         Benefits to Ibex Executives and Shareholders from Merger............................................... 47
         Representations and Covenants.......................................................................... 47
         Escrow   .............................................................................................. 47
         Conditions to the Merger............................................................................... 48
         Termination and Termination Fees....................................................................... 48
         Waivers and Amendments................................................................................. 49
         Certain Federal Income Tax Matters..................................................................... 49
         Accounting Treatment................................................................................... 51
         Affiliates' Restrictions on Sale of Castelle Common Stock.............................................. 51
         Dissenters' Rights..................................................................................... 52
         Merger Expenses........................................................................................ 53
         Regulatory Matters..................................................................................... 54

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION.................................................... 55
         Unaudited Pro Forma Condensed Combined Balance Sheet June 28, 1996..................................... 56
         Unaudited Pro Forma Condensed Combined Statements of Operations Years Ended
                  December 31, 1993, 1994 and 1995.............................................................. 57


</TABLE>
                                       ii.

<PAGE>

<TABLE>
<CAPTION>



                                TABLE OF CONTENTS
                                   (continued)
                                                                                                               Page

         Unaudited Pro Forma Condensed Combined Statements of Operations Six Months
                  Ended June 30, 1995 and June 28, 1996......................................................... 58
         Notes to Unaudited Pro Forma Condensed Combined Financial Statements................................... 59

<S>                                                                                                              <C>
BUSINESS OF CASTELLE............................................................................................ 61
         General  .............................................................................................. 61
         Industry Background.................................................................................... 61
         Castelle Strategy...................................................................................... 62
         Products .............................................................................................. 63
         Research and Development............................................................................... 68
         Sales, Marketing and Distribution...................................................................... 69
         Customer Service and Support........................................................................... 70
         Competition............................................................................................ 70
         Manufacturing.......................................................................................... 71
         Proprietary Rights..................................................................................... 71
         Government Regulation.................................................................................. 72
         Employees.............................................................................................. 72
         Properties............................................................................................. 73
         Legal Proceedings...................................................................................... 73

BUSINESS OF IBEX................................................................................................ 74
         General  .............................................................................................. 74
         Industry Background.................................................................................... 74
         Ibex Strategy.......................................................................................... 74
         Products .............................................................................................. 75
         Customer Support Packages.............................................................................. 77
         Products Under Development............................................................................. 77
         Competition............................................................................................ 79
         Research and Development............................................................................... 79
         Sales, Marketing and Distribution...................................................................... 80
         Proprietary Rights..................................................................................... 81
         Government Regulation.................................................................................. 81
         Employees.............................................................................................. 81
         Properties............................................................................................. 82
         Legal Proceedings...................................................................................... 82

MANAGEMENT OF CASTELLE.......................................................................................... 83
         Directors Not Standing For Re-Election................................................................. 84
         Compensation of Executive Officers..................................................................... 85
         Compensation of Directors.............................................................................. 85



</TABLE>
                                      iii.

<PAGE>

<TABLE>
<CAPTION>



                                TABLE OF CONTENTS
                                   (continued)
                                                                                                               Page

<S>                                                                                                              <C>
DESCRIPTION OF CASTELLE COMPENSATION PLANS...................................................................... 87
         1988 Equity Incentive Plan............................................................................. 87
         Castelle's 1995 Non-Employee Directors' Stock Option Plan.............................................. 92

MANAGEMENT OF IBEX.............................................................................................. 95
         Executive Compensation................................................................................. 96

CASTELLE CONSOLIDATED SELECTED FINANCIAL DATA................................................................... 97

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
RESULTS OF OPERATIONS OF CASTELLE...............................................................................100
         Six Months Ended June 28, 1996 and June 30, 1995.......................................................100
         Years Ended December 31, 1995, 1994 and 1993...........................................................101
         Selected Quarterly Operating Results...................................................................103
         Quarterly Fluctuations.................................................................................105
         Liquidity and Capital Resources........................................................................105

CASTELLE STOCK, OPTIONS AND DIVIDENDS...........................................................................106

IBEX SELECTED FINANCIAL DATA....................................................................................107

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
RESULTS OF OPERATIONS OF IBEX...................................................................................109
         Six Months Ended June 30, 1996 and June 30, 1995.......................................................109
         Years Ended December 31, 1995, 1994 and 1993...........................................................110
         Liquidity and Capital Resources........................................................................111

IBEX STOCK, OPTIONS AND DIVIDENDS...............................................................................111

CASTELLE SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND
MANAGEMENT......................................................................................................112
         Compliance with the Reporting Requirements of Section 16(a)............................................114

IBEX SECURITY OWNERSHIP OF PRINCIPAL SHAREHOLDERS AND
MANAGEMENT......................................................................................................116

CERTAIN TRANSACTIONS............................................................................................118
         Stock Purchase by Executive Officers of Castelle.......................................................118
         Castelle Director and Shareholder Affiliations with Underwriter........................................118

COMPARISON OF RIGHTS OF SHAREHOLDERS OF CASTELLE AND IBEX.......................................................119



</TABLE>
                                       iv.

<PAGE>

<TABLE>
<CAPTION>



                                TABLE OF CONTENTS
                                   (continued)
                                                                                                               Page

<S>                                                                                                            <C> 
ADDITIONAL MATTERS FOR CONSIDERATION OF CASTELLE SHAREHOLDERS...................................................120
         Election of Directors..................................................................................120
                  Nominees .....................................................................................120
                  Retiring Director.............................................................................121
                  Board Committees and Meetings.................................................................121
         Ratification of Selection of Independent Auditors......................................................122

ADDITIONAL MATTER FOR CONSIDERATION OF IBEX SHAREHOLDERS........................................................123
         Approval of the 1992 Stock Option Plan.................................................................123
                  General  .....................................................................................123
                  Purpose  .....................................................................................123
                  Administration................................................................................123
                  Eligibility...................................................................................123
                  Terms of Options..............................................................................124
                  Adjustment Provisions.........................................................................124
                  Effect of Certain Corporate Events............................................................125
                  Duration, Amendment and Termination...........................................................125
                  Restrictions on Transfer......................................................................125
                  Tax Consequences..............................................................................125

SHAREHOLDER PROPOSALS...........................................................................................126

EXPERTS  .......................................................................................................126

LEGAL MATTERS...................................................................................................126

OTHER MATTERS...................................................................................................127

INDEX TO FINANCIAL STATEMENT....................................................................................F-1


APPENDICES:

APPENDIX  A -  Agreement  and Plan of Merger  and  Reorganization  
APPENDIX  B -  Opinion of Unterberg  Harris  
APPENDIX  C -  Sections  1300-1312 of the California Corporations Code 
APPENDIX  D -  1992 Stock Option Plan



</TABLE>
                                       v.

<PAGE>



NO PERSON HAS BEEN  AUTHORIZED BY CASTELLE OR IBEX TO GIVE ANY INFORMATION OR TO
MAKE ANY  REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS IN CONNECTION WITH THE
SOLICITATION  OF PROXIES OR THE OFFERING OF SECURITIES MADE HEREBY AND, IF GIVEN
OR MADE, SUCH  INFORMATION OR  REPRESENTATION  MUST NOT BE RELIED UPON AS HAVING
BEEN  AUTHORIZED BY CASTELLE OR IBEX.  THIS  PROSPECTUS  DOES NOT  CONSTITUTE AN
OFFER TO SELL OR A  SOLICITATION  OF AN OFFER TO BUY THE  SECURITIES  OFFERED BY
THIS PROXY STATEMENT/PROSPECTUS OR A SOLICITATION OF A PROXY IN ANY JURISDICTION
WHERE,  OR TO ANY PERSON TO WHOM,  IT WOULD BE UNLAWFUL TO MAKE SUCH AN OFFER OR
SOLICITATION.

NEITHER THE DELIVERY OF THIS  PROSPECTUS NOR ANY  DISTRIBUTION OF THE SECURITIES
TO  WHICH  THIS  JOINT  PROXY  STATEMENT/PROSPECTUS  RELATES  SHALL,  UNDER  ANY
CIRCUMSTANCES,  CREATE  AN  IMPLICATION  THAT  THERE  HAS BEEN NO  CHANGE IN THE
INFORMATION CONTAINED HEREIN SINCE THE DATE HEREOF.

                              AVAILABLE INFORMATION

     Castelle is subject to the  informational  requirements  of the  Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in  accordance
therewith  files  reports,  proxy  statements  and  other  information  with the
Securities and Exchange  Commission (the  "Commission").  These materials can be
inspected  and  copied at the  public  reference  facilities  maintained  by the
Commission at Room 1024, 450 Fifth Street,  N.W.,  Judiciary Plaza,  Washington,
D.C. 20549 and at the Commission's regional offices at Citicorp Center, 500 West
Madison Street,  Suite 1400,  Chicago,  Illinois 60661 and 7 World Trade Center,
Suite 1300,  New York,  New York 10048.  Copies of these  materials  can also be
obtained  from the  Commission  at  prescribed  rates by  writing  to the Public
Reference Section of the Commission,  450 Fifth Street, N.W.,  Washington,  D.C.
20549. In addition,  the Commission  maintains a Web site at  http://www.sec.gov
that contains  reports,  proxy and information  statement and other  information
regarding issuers such as Castelle that file electronically with the Commission.
Castelle  Common Stock is listed on the Nasdaq  National Market and such reports
and other  information  concerning  Castelle may be inspected  and copied at the
offices of the National Association of Securities Dealers,  Inc., 1735 K Street,
N.W., Washington, D.C. 20006.

     Under the rules and  regulations of the  Commission,  the  solicitation  of
proxies  from  shareholders  of Ibex to approve  and adopt the Merger  Agreement
constitutes an offering of the Castelle  Common Stock to be issued in connection
with  the  Merger.  Accordingly,  Castelle  has  filed  with  the  Commission  a
Registration  Statement on Form S-4 under the Securities Act of 1933, as amended
(the  "Securities  Act"),  with  respect  to such  offering  (the  "Registration
Statement").  This  Prospectus  constitutes  the  prospectus of Castelle that is
filed as part of the  Registration  Statement.  Other parts of the  Registration
Statement  are omitted from this  Prospectus  in  accordance  with the rules and
regulations of the Commission.  Copies of the Registration Statement,  including
the  exhibits  to the  Registration  Statement  and other  material  that is not
included herein,  may be inspected,  without charge,  at the regional offices of
the  Commission  referred to above,  or obtained  at  prescribed  rates from the
Public Reference Section of the Commission at the address set forth above.



                                        1

<PAGE>
     Statements made in this Prospectus  concerning the contents of any contract
or other document are not necessarily complete. With respect to each contract or
other document filed as an exhibit to the Registration  Statement,  reference is
hereby  made to that  exhibit  for a more  complete  description  of the  matter
involved,  and each such  statement is hereby  qualified in its entirety by such
reference.

     Except for the historical  information  contained herein, the discussion in
this  Prospectus  contains  forward-looking  statements  that involve  risks and
uncertainties.  Castelle's  actual  results could differ  materially  from those
discussed  here.  Factors  that could cause or  contribute  to such  differences
include,  but are not limited  to,  those  discussed  in the  sections  entitled
"Summary,"  "Risk Factors,"  "Unaudited Pro Forma Condensed  Combined  Financial
Information,"   "Business  of  Castelle,"   "Business  of  Ibex,"  "Management's
Discussion  and Analysis of Financial  Condition  and Results of  Operations  of
Castelle" and "Management's  Discussion and Analysis of Financial  Condition and
Results of  Operations  of Ibex," as well as those  discussed  elsewhere in this
Prospectus and any documents incorporated herein by reference.


                                        2

<PAGE>



                                     SUMMARY

     The following is a summary of certain  information  contained  elsewhere in
this  Prospectus.  The summary  does not contain a complete  description  of the
terms of the Merger and is  qualified  in its  entirety by reference to the full
text of this Prospectus and the Appendices hereto.  Shareholders of Castelle and
shareholders  of Ibex are urged to read this  Prospectus  and the  Appendices in
their entirety.

The Companies

     Castelle

     Castelle  designs,  develops,  markets  and  supports  network  enhancement
products, both software and hardware, that improve the productivity, performance
and  functionality  of local area  networks  ("LANs") and enhance the LAN user's
ability to communicate. The products are sold through domestic and international
distributors and selected Original Equipment Manufacturers ("OEMs") worldwide.

     Castelle was  originally  incorporated  in  California  in September  1987.
Unless  otherwise  indicated,   "Castelle"  refers  to  Castelle,  a  California
corporation,  and its wholly-owned subsidiaries.  Castelle's principal executive
offices are located at 3255-3 Scott Boulevard,  Santa Clara,  California  95054.
Castelle's telephone number is (408) 496-0474.

     Ibex

     Ibex   Technologies,   Inc.   ("Ibex")   designs,   develops   and  markets
fax-on-demand, fax-gateway, fax broadcast and Web/fax applications that are sold
direct and  through  value-added  resellers  ("VARs").  Ibex  products  are sold
primarily  to  medium  to  large   organizations   through  system  integrators,
distributors  and  directly  to  end  users.  Ibex  also  provides   significant
implementation and support services, both directly and through third parties, to
ensure the successful deployment and ongoing maintenance of Ibex products.

     Ibex was  incorporated in California in 1990.  Ibex's  principal  executive
offices are located at 4921 R.J.  Mathews Parkway,  El Dorado Hills,  California
95762. Ibex's telephone number is (916) 939- 8888.

Meetings of Shareholders

     Date, Time and Place

     Castelle. The Castelle Meeting will be held on Tuesday,  November 19, 1996,
at 9:00 a.m., local time, at Castelle's offices at 3255-3 Scott Boulevard, Santa
Clara, California.

     Ibex. The Ibex Meeting will be held on Monday,  November 18, 1996, at 10:00
a.m.,  local time, at Ibex's  offices at 4921 R.J.  Mathews  Parkway,  El Dorado
Hills, California.



                                        3

<PAGE>



     Purposes of the Meetings

     Castelle Meeting. At the Castelle Meeting, shareholders of Castelle will be
asked to consider and vote upon (i) a proposal to approve the Merger  Agreement,
a copy of which is attached hereto as Appendix A; (ii) the election of directors
to the  Board of  Directors,  to serve  for the  ensuing  year and  until  their
successors are elected; and (iii) the ratification of the selection of Coopers &
Lybrand L.L.P.  as independent  auditors for Castelle for its fiscal year ending
December 31, 1996.

     Ibex Meeting.  At the Ibex Meeting,  shareholders  of Ibex will be asked to
consider and vote upon (i) a proposal to approve and adopt the Merger Agreement,
a copy of which is attached  hereto as Appendix A, and (ii) the  approval of the
1992 Stock Option Plan, a copy of which is attached hereto as Appendix D.

     Record Date; Shares Entitled to Vote

     Castelle.  Holders of record of  Castelle  Common  Stock on October 7, 1996
(the  "Record  Date")  are  entitled  to notice  of and to vote at the  Castelle
Meeting. At the close of business on the Record Date, there were outstanding and
entitled to vote 3,621,261  shares of Castelle Common Stock,  each of which will
be  entitled  to one vote on each  matter to be acted  upon.  See "The  Castelle
Meeting -- Record Date, Voting Rights and Outstanding Shares."

     Ibex.  Holders  of record of Ibex  Common  Stock and Ibex  Preferred  Stock
(collectively,  "Ibex  Capital  Stock") on  November  1, 1996 (the "Ibex  Record
Date") are entitled to notice of and to vote at the Ibex  Meeting.  At the close
of business on the Ibex Record Date, there were outstanding and entitled to vote
142,316 shares of Ibex Common Stock and 48,035 shares of Ibex  Preferred  Stock.
Shares of Ibex  Preferred  Stock will vote together as a single class and shares
of Ibex Common Stock will vote as a separate class on the approval of the Merger
Agreement.  Shares of Ibex Common Stock and shares of Ibex Preferred  Stock will
vote  together as one class on the approval of the 1992 Stock  Option Plan.  See
"The Ibex Meeting -- Record Date and Outstanding Shares."

     Votes Required

     Castelle.  Approval of the Merger  Agreement  will require the  affirmative
vote of a majority of the outstanding shares of Castelle Common Stock. Directors
shall be elected by a plurality of the votes present in person or represented by
proxy and entitled to vote.  Ratification  of the selection of Coopers & Lybrand
L.L.P. as Castelle's auditors for the fiscal year ending December 31, 1996 shall
require the affirmative vote of the holders of a majority of the total shares of
Castelle  Common Stock present in person or represented by proxy and entitled to
vote therein.

     Ibex.  Approval  and  adoption  of the Merger  Agreement  will  require the
affirmative  vote of the  holders of (i) a majority of the shares of Ibex Common
Stock  outstanding on the Record Date,  voting as a separate  class;  and (ii) a
majority of the shares of Ibex Preferred  Stock  outstanding on the Record Date,
voting as a separate class.  Certain shareholders and the executive officers and
directors of Ibex have agreed to vote all the shares of Ibex Capital Stock owned
or  controlled  by them in favor of such  approval and  adoption.  On the Record
Date,  such  shareholders  and  such  executive  officers  and  directors  owned
approximately 70.3% and 100.0%, respectively,  of all then outstanding shares of
Ibex  Common  Stock  and Ibex  Preferred  Stock.  See  "The  Merger  --  Related
Agreements -- Irrevocable Proxy  Agreements."  Approval of the 1992 Stock Option
Plan will require the affirmative  vote of a majority of the outstanding  shares
of Ibex Common Stock and Ibex Preferred Stock, voting together as one class.


                                        4

<PAGE>

Opinion of Financial Advisor

     Unterberg Harris has delivered its written opinion dated August 22, 1996 to
the effect that the Merger  consideration  is fair,  from a  financial  point of
view, to Castelle.  The full text of the opinion of Unterberg Harris, which sets
forth the  assumptions  made,  matters  considered and limitations on the review
undertaken by Unterberg  Harris,  is attached as Appendix B to this  Prospectus.
Castelle shareholders are urged to read the opinion in its entirety.

Recommendations of Boards of Directors

     Castelle's  Board of  Directors.  The Board of  Directors  of Castelle  has
unanimously  approved the Merger Agreement and has determined that the Merger is
in the best  interests of Castelle and its  shareholders.  The Castelle Board of
Directors  unanimously  recommends approval and adoption of the Merger Agreement
by the Castelle shareholders.  The primary factors considered and relied upon by
the Castelle Board of Directors in reaching its  recommendation are described in
"The Merger and Related  Transactions  -- Reasons for the  Merger." In addition,
the  Castelle  Board of  Directors,  acting on the  recommendation  of the Audit
Committee  of Castelle,  has  unanimously  approved  the  selection of Coopers &
Lybrand L.L.P.  as Castelle's  auditors for the fiscal year ending  December 31,
1996 and  unanimously  recommends  ratification  of the  selection of Castelle's
auditors by the Castelle shareholders.

     Ibex's  Board  of  Directors.  The  Board  of  Directors  of Ibex  has also
unanimously  approved the Merger Agreement and has determined that the Merger is
in the best interests of Ibex and its shareholders.  The Ibex Board of Directors
unanimously recommends approval and adoption of the Merger Agreement by the Ibex
shareholders.  The primary factors  considered and relied upon by the Ibex Board
of  Directors in reaching its  recommendation  are  described in "The Merger and
Related  Transactions -- Reasons for the Merger." The Board of Directors of Ibex
has also  unanimously  approved  the  adoption of the 1992 Stock Option Plan and
unanimously recommends approval thereof by the Ibex shareholders.

The Merger

     General

     Effects  of the  Merger.  The Merger  will be  consummated  promptly  after
Castelle  shareholder  and Ibex  shareholder  approval and the  satisfaction  or
waiver of the other conditions to consummation of the Merger.  Upon consummation
of the Merger,  Ibex will merge into  Castelle.  The  shareholders  of Ibex will
become  shareholders of Castelle (as described below),  and their rights will be
governed by Castelle's Articles of Incorporation, as amended, and Bylaws.

     Reasons for the Merger.  In the discussions  that led to the signing of the
Merger  Agreement,  the Board of  Directors  of Castelle  identified a number of
potential  benefits  which  would  accrue to Castelle as a result of the Merger,
including:  (i) the opportunity to develop  technology and applications based on
the  expertise  of Ibex in the  delivery  of  information-on-demand  through the
mechanism  of  choice-fax,  e-mail or the Web;  (ii) the  ability  to  diversify
Castelle's product base and in the process realize higher average selling prices
and  higher  margins;  and (iii) the  opportunity  to  establish  a  significant
presence in the VAR market sector as a result of Ibex's expertise in that area.

                                        5

<PAGE>

     The Board of  Directors  of Ibex has also  identified a number of potential
benefits that would accrue to Ibex as a result of the Merger, including: (i) the
opportunity to take advantage of Castelle's  established  distribution channels;
(ii) increased  operating  flexibility  and increased  development  capital as a
result of Castelle's  current resources and access to public markets;  and (iii)
the conversion of a relatively  illiquid  investment into a liquid one. See "The
Merger and Related Transactions -- Reasons for the Merger."

     Conversion of Shares

     Ibex Shares. Upon the effective time of the Merger, the Merger Shares shall
be  available  for issuance to holders of Ibex  Preferred  Stock and Ibex Common
Stock. In the event the closing price of a share of Castelle Common Stock on the
business day immediately  preceding the effective time of the Merger is $9.42 or
greater,  each share of Ibex Common Stock and each share of Ibex Preferred Stock
outstanding  immediately  prior to the  effective  time of the  Merger  shall be
converted into the right to receive  4.17731 shares of Castelle Common Stock. In
the event the closing price of a share of Castelle  Common Stock on the business
day  immediately  preceding the effective time of the Merger is less than $9.42,
each  share  of  Ibex  Preferred  Stock  outstanding  immediately  prior  to the
effective  time of the Merger shall  receive a pro rata  allocation of shares of
Castelle  Common Stock with a fair market value on the business day  immediately
preceding  the  effective  time  of the  Merger  equal  to the  Preferred  Stock
Preference. Holders of Ibex Preferred Stock and Ibex Common Stock shall share in
a pro rata distribution, based on the total number of shares held, of the Merger
Shares remaining after allocation of the Preferred Stock Preference.

     If any shares of Ibex Common  Stock  outstanding  immediately  prior to the
consummation  of the Merger are unvested or are subject to a repurchase  option,
risk of forfeiture or other  condition  under any  applicable  restricted  stock
purchase  agreement or other  agreement  with Ibex,  then the shares of Castelle
Common  Stock  issued in exchange for such shares of Ibex Common Stock will also
be unvested and subject to the same  repurchase  option,  risk of  forfeiture or
other  condition,  and the  certificates  representing  such  shares of Castelle
Common Stock may accordingly be marked with appropriate legends.

     As of the date of this  Prospectus,  the Articles of  Incorporation of Ibex
entitle the holders of Ibex  Preferred  Stock to receive $6.25 per share of Ibex
Preferred  Stock prior to any other  allocations to  shareholders in a merger if
the  total  consideration  paid to  acquire  Ibex is less than $8  million.  The
holders of Ibex  Preferred  Stock have agreed to convert  19,235  (approximately
40%) of the  outstanding  shares of Ibex Preferred  Stock into Ibex Common Stock
immediately  prior to the consummation of the Merger. At the time of the Merger,
therefore,  assuming the Castelle  Common  Stock issued in  connection  with the
Merger has a fair  market  value of less than $8  million,  there will be 28,800
shares of Ibex Preferred Stock  outstanding with an aggregate  preference due of
$180,000.

     Although  the number of shares of Castelle  Common  Stock to be received in
exchange for each share of Ibex Preferred  Stock and Ibex Common Stock cannot be
calculated  at this time because the exchange  ratios will be  determined by the
fair  market  value of a share of  Castelle  Common  Stock on the  business  day
preceding the effective time of the Merger, for illustrative  purposes only, the
shares of Castelle  Common Stock to be received in exchange  for Ibex  Preferred
Stock  and  Ibex  Common  Stock  would  be as  follows  as of the  date  of this


                                       6
<PAGE>

Prospectus  at the  Designated  Castelle  Stock Prices  shown  below: 

                                   Shares of Castelle Common Stock     
                                     Received for each Share of:
                          ---------------------------------------------------- 
Designated Castelle  
  Stock  Price            Ibex  Preferred  Stock          Ibex  Common  Stock
- -------------------       ----------------------          -------------------- 
      $ 6.00                     5.07155                         4.02988
      $ 7.00                     4.94378                         4.05094 
      $ 8.00                     4.84798                         4.06673  
 $ 9.42 or greater               4.17731                         4.17731

     Utilizing  a closing  price  for a share of  Castelle  Common  Stock on the
business day immediately prior to the Merger of $6.00 as the Designated Castelle
Stock  Price,  approximately  146,061  shares of Castelle  Common Stock would be
issued in the Merger to holders of Ibex Preferred Stock,  approximately  645,792
shares of Castelle  Common Stock would be issued to holders of Ibex Common Stock
in the Merger, and approximately 58,147 shares of Castelle Common Stock would be
reserved for issuance upon the exercise of Ibex Options.

     Utilizing  a closing  price  for a share of  Castelle  Common  Stock on the
business day immediately prior to the Merger of $7.00 as the Designated Castelle
Stock  Price,  approximately  142,381  shares of Castelle  Common Stock would be
issued in the Merger to holders of Ibex Preferred Stock,  approximately  649,168
shares of Castelle  Common Stock would be issued to holders of Ibex Common Stock
in the Merger, and approximately 58,451 shares of Castelle Common Stock would be
reserved for issuance upon the exercise of Ibex Options.

     Utilizing  a closing  price  for a share of  Castelle  Common  Stock on the
business day immediately prior to the Merger of $7.00 as the Designated Castelle
Stock  Price,  approximately  142,381  shares of Castelle  Common Stock would be
issued in the Merger to holders of Ibex Preferred Stock,  approximately  649,168
shares of Castelle  Common Stock would be issued to holders of Ibex Common Stock
in the Merger, and approximately 58,451 shares of Castelle Common Stock would be
reserved for issuance upon the exercise of Ibex Options.

     Utilizing  a closing  price  for a share of  Castelle  Common  Stock on the
business day immediately prior to the Merger of $8.00 as the Designated Castelle
Stock  Price,  approximately  139,622  shares of Castelle  Common Stock would be
issued in the Merger to holders of Ibex Preferred Stock,  approximately  651,699
shares of Castelle  Common Stock would be issued to holders of Ibex Common Stock
in the Merger, and approximately 58,679 shares of Castelle Common Stock would be
reserved for issuance upon the exercise of Ibex Options.

     Utilizing  a closing  price  for a share of  Castelle  Common  Stock on the
business  day  immediately  prior to the Merger of $9.42 or  greater  results in
approximately 120,307 shares of Castelle Common Stock being issued in the Merger
to holders of Ibex  Preferred  Stock,  approximately  669,419 shares of Castelle
Common  Stock  being  issued to holders of Ibex  Common  Stock in the Merger and
approximately 60,274 shares of Castelle Common Stock being reserved for issuance
upon the exercise of assumed Ibex Options.  The foregoing numbers are subject to
change based upon the  granting,  exercise,  termination  or  expiration of Ibex
Options at or prior to the Merger Date.

     A recent price for Castelle Common Stock is shown on the cover page of this
Prospectus.  Holders of Ibex Common Stock may obtain the daily closing prices of
Castelle  Common Stock from The Wall Street  Journal or by calling Ibex at (916)
939-8888.

     Of the total shares of Castelle Common Stock issued in the Merger, 10% will
be retained  for a period of time in escrow as security to Castelle  against any
breach of  representations,  warranties or covenants by Ibex and the  Designated
Shareholders  (as defined  below).  Such shares shall be contributed  out of the
shares to be received as a result of the Merger by the Designated  Shareholders.
The Designated  Shareholders are Ney Grant, Betsy Gray-Grant,  Clovis Mattos and
Curtis  Powell.  Any shares not  required to satisfy  such  obligations  will be
released from escrow to the  Designated  Shareholders  after  termination of the
escrow period. See "The Merger and Related Transactions -- Escrow."


                                        7

<PAGE>



     No fractional shares of Castelle Common Stock will be issued in the Merger.
Instead,  each Ibex  shareholder  who would  otherwise  be entitled to receive a
fraction  of a share of  Castelle  Common  Stock will  receive an amount of cash
equal to $8.00 multiplied by the fraction of a share of Castelle Common Stock to
which the shareholder  would otherwise be entitled.  Castelle intends to use its
current cash resources to fund the payments for fractional shares.

     Ibex Options.  Upon consummation of the Merger,  each then outstanding Ibex
Option will  automatically  be converted  into an option to purchase a number of
shares of Castelle  Common Stock  determined by multiplying the number of shares
of Ibex Common Stock subject to the Ibex Option by the conversion  rate utilized
to convert  Ibex  Common  Stock into  Castelle  Common  Stock on the date of the
Merger,  at an exercise  price per share of Castelle  Common  Stock equal to the
exercise price per share of the Ibex Option at the time of the Merger divided by
the conversion  rate utilized to convert Ibex Common Stock into Castelle  Common
Stock  on the date of the  Merger,  rounded  up to the  nearest  cent.  To avoid
fractional  shares,  the number of shares of Castelle  Common Stock subject to a
converted  Ibex Option will be rounded down to the nearest whole share,  with no
cash being  payable  for such  fractional  share.  The other  terms of each Ibex
Option,  including status as a  "non-statutory  stock option" for federal income
tax purposes and vesting schedule, will remain unchanged.

     As of the Ibex Record Date, 14,429 shares of Ibex Common Stock were subject
to outstanding  Ibex Options.  Assuming a fair market value for Castelle  Common
Stock on the business day  immediately  preceding  the Merger of $6.00 per share
and that the same  number of shares are  subject  to Ibex  Options at the Merger
Date as were  outstanding  as of the Ibex  Record  Date,  such  options  will be
converted into options to purchase an aggregate of  approximately  58,147 shares
of Castelle Common Stock.  Should the fair market value of Castelle Common Stock
on the business day immediately  preceding the Merger be $7.00 per share and the
same  number of shares be  subject to Ibex  Options  at the Merger  Date as were
outstanding  as of the Ibex Record Date,  such  options  will be converted  into
options to purchase an  aggregate  of  approximately  58,451  shares of Castelle
Common  Stock.  Should the fair  market  value of Castelle  Common  Stock on the
business day  immediately  preceding  the Merger be $8.00 per share and the same
number  of  shares  be  subject  to  Ibex  Options  at the  Merger  Date as were
outstanding  as of the Ibex Record Date,  such  options  will be converted  into
options to purchase an  aggregate  of  approximately  58,679  shares of Castelle
Common  Stock.  Should the fair market  value for  Castelle  Common Stock on the
business day immediately  preceding the Merger be $9.42 per share or greater and
the same number of shares be subject to Ibex  Options at the Merger Date as were
as of the Ibex Record  Date,  such  options  will be  converted  into options to
purchase an aggregate of approximately 60,274 shares of Castelle Common Stock.

     Surrender of Certificates.  If the Merger becomes effective,  Castelle will
mail a letter of transmittal with  instructions to all holders of record of Ibex
Capital  Stock as of the  effective  time of the Merger for use in  surrendering
their stock  certificates  in exchange for  certificates  representing  Castelle
Common  Stock and a cash  payment  in lieu of  fractional  shares.  Certificates
representing  shares of Ibex Capital Stock should not be  surrendered  until the
letter of transmittal is received.


                                        8

<PAGE>



     Comparative Stock Price and Book Value Per Share

     The  following  table sets forth the  closing  prices per share of Castelle
Common Stock on the Nasdaq  National Market on August 22, 1996, the last trading
day before  announcement  of the proposed  Merger,  and on October 31, 1996, the
latest  practicable  trading  day before the  printing of this  Prospectus,  and
equivalent per share prices for Ibex Preferred Stock and Ibex Common Stock based
upon application of the conversion described above in "Conversion of Shares":

                                             Ibex Equivalent (a)
                                             -------------------
                                            Ibex             Ibex
                         Castelle         Preferred         Common
                       Common Stock         Stock           Stock
                       ------------       ---------         ------
August 22, 1996.....      $7.00             $34.61          $28.36
October 31, 1996....      $6.00             $30.43          $24.18

- ----------

(a)  Represents  the  equivalent  of one  share  of Ibex  Common  Stock  or Ibex
     Preferred  Stock  calculated by multiplying the price per share of Castelle
     Common Stock by the  conversion  rate  applicable at that  Castelle  Common
     Stock price per share.

     At June 28, 1996, the book values per share of Castelle Common Stock,  Ibex
Preferred  Stock and Ibex Common  Stock,  the pro forma  combined book value per
share and the book value per share of Ibex Preferred Stock and Ibex Common Stock
based on the  conversion of  outstanding  Ibex  Preferred  Stock and Ibex Common
Stock as of June 28, 1996 at the closing price for Castelle Common Stock on June
28, 1996 of $7.75 were as follows:
<TABLE>
<CAPTION>

                                                                                 Ibex Equivalent (a)
                                                                                 -------------------
                                          Ibex          Ibex                       Ibex        Ibex
                        Castelle        Preferred      Common      Pro Forma     Preferred    Common
                      Common Stock        Stock        Stock       Combined        Stock      Stock
                      ------------      ---------      ------      ---------     ---------    ------
<S>  <C> <C>              <C>             <C>          <C>           <C>           <C>        <C>   
June 28, 1996 ......      $3.23           $9.60        $3.35         $2.58         $12.74     $10.44

</TABLE>

- ----------

(a)  Represents  the  equivalent  of one share of Ibex  Preferred  Stock or Ibex
     Common Stock  calculated by  multiplying  the pro forma combined book value
     per share of Castelle  Common Stock by the conversion rate which would have
     been in effect had the Merger been effective on June 28, 1996.

     Accordingly,  the conversion resulted in a premium to Ibex shareholders and
dilution to Castelle  shareholders  based on the  respective  book values of the
shares at June 28, 1996.

     Related Agreements

     Affiliate Agreements.  To help ensure that the Merger will be accounted for
as a "pooling of  interests,"  the executive  officers and directors of Castelle
and Ibex and 10% shareholders of Ibex will execute agreements that prohibit such
persons  from  disposing of their shares  during the period  commencing  30 days
prior to the  closing  date of the Merger (the  "Closing  Date") and ending when
Castelle first publicly releases its quarterly  financial  statements  including
the combined  financial results of Ibex and Castelle for a period of at least 30
days.  Pursuant to such  agreements,  Ibex affiliates will also  acknowledge the

                                       9
<PAGE>

resale restrictions  imposed by Rule 145 promulgated under the Securities Act on
shares received by them in the Merger. In addition, certain shareholders of Ibex
will also sign  agreements  making  certain  representations  pertaining  to the
"continuity of interest"  requirements for a tax-free  reorganization.  See "The
Merger and Related Transactions -- Certain Federal Income Tax Matters" below.

     Conversion  Agreement.  As of the date of this Prospectus,  the Articles of
Incorporation  of Ibex  entitle the holders of Ibex  Preferred  Stock to receive
$6.25 per  share of Ibex  Preferred  Stock  prior to any  other  allocations  to
shareholders in a merger if the total consideration paid to acquire Ibex is less
than $8  million.  The  holders of Ibex  Preferred  Stock have agreed to convert
19,235  (approximately  40%) of the  outstanding  shares of Ibex Preferred Stock
into Ibex Common Stock  immediately  prior to the consummation of the Merger. At
the time of the Merger, therefore,  assuming the Castelle Common Stock issued in
connection  with the Merger  has a fair  market  value of less than $8  million,
there  will  be  28,800  shares  of Ibex  Preferred  Stock  outstanding  with an
aggregate preference due of $180,000.

     Irrevocable  Proxy  Agreements.  Pursuant to irrevocable  proxy  agreements
executed  concurrently  with the execution of the Merger  Agreement,  directors,
executive  officers  and  certain  major  shareholders  of Ibex  holding  in the
aggregate approximately 100.0% of the outstanding shares of Ibex Preferred Stock
and 70.3% of the outstanding shares of Ibex Common Stock on the record date have
agreed to vote in favor of the Merger and have granted  Castelle proxies to vote
their  shares  of Ibex  Common  Stock and Ibex  Preferred  Stock in favor of the
Merger.

     Benefits to Ibex Executives and Shareholders from Merger

     Ney Grant, Director,  President and Chief Executive Officer of Ibex, Curtis
Powell,  Director and Vice President of Ibex, and three other  employees of Ibex
have agreed to execute  employment  agreements  with Castelle in connection with
the Merger.  In addition,  Ney Grant,  Curtis Powell and one other employee have
agreed to execute noncompetition agreements with Castelle in connection with the
Merger.  In exchange for the  non-competition  agreements,  each  signatory  has
agreed to refrain  from  providing  services,  support,  products or  technology
related to the  business  of Ibex to any person for a period of two years  after
termination  of his employment  with Castelle with respect to Messrs.  Grant and
Powell and one year with respect to the other employee.

     In addition,  holders of Ibex Preferred  Stock have been granted the right,
effective  upon the Merger,  to register the Castelle  Common Stock  received in
connection  with the  Merger  for  resale  to the  public,  subject  to  certain
restrictions  and the  approval  of  such  rights  by the  existing  holders  of
registration  rights.  Upon the  approval  of existing  holders of  registration
rights,  holders of Ibex Common Stock shall  receive  more limited  registration
rights  which will be subject to certain  restrictions,  including  the right to
participate in the  registration of shares of Castelle stock initiated by either
Castelle  or  holders of  registration  rights  other  than the  holders of Ibex
Preferred Stock identified above.

     Representations and Covenants

     Under  the  Merger   Agreement,   Castelle   and  Ibex  made  a  number  of
representations  regarding  their  respective  businesses,  capital  structures,
operations,  financial condition and other matters, including their authority to
enter into the Merger  Agreement and to consummate the Merger.  Ibex  covenanted
that,  until the  consummation  of the Merger or the  termination  of the Merger
Agreement,  it will  maintain its  business,  it will not take  certain  actions
outside the ordinary course of business without Castelle's  consent.  Each party
covenants that until the  consummation  of the Merger or the  termination of the
Merger Agreement,  it will use its commercially reasonable efforts to consummate

                                       10
<PAGE>

the  Merger.  Each party has agreed not to  initiate  or solicit  any  proposals
relating to the possible  acquisition  of that party or any material  portion of
its capital stock or assets by any person other than  Castelle's  acquisition of
Ibex, and has further  agreed not to enter into any agreement  providing for any
such acquisition.

     Escrow

     The Merger  Agreement  provides  that 10% of the shares of Castelle  Common
Stock  to be  issued  to Ibex  shareholders  will be  placed  in  escrow  by the
Designated  Shareholders  to  indemnify  Castelle  for damages  arising from the
following  circumstances:  (a) an inaccuracy in or breach of a representation or
warranty of Ibex or the Designated  Shareholders in the Merger  Agreement or any
related  agreement;  (b) a breach of a  covenant  or  obligation  of Ibex or the
Designated Shareholders;  or (c) any legal proceeding in connection with clauses
(a) and (b).  Representations  and  warranties  which are  reviewed in the audit
process shall terminate when Castelle publishes its audited financial statements
for the fiscal year which includes the Merger Date and the escrow will terminate
365 days after the Closing  Date.  The Escrow Agent is presently  expected to be
First Trust of  California,  National  Association.  Subject to the retention of
shares in the escrow to cover claims made during the escrow  period,  any shares
remaining in the escrow after the 365 day period will be distributed pro rata to
the Designated Shareholders. See "The Merger and Related Transactions -- Escrow"
and "-- Benefits to Ibex Executives and Shareholders from the Merger."

     Conditions to the Merger

     In  addition  to  the  requirement   that  the  approval  by  the  Castelle
shareholders  and Ibex  shareholders be received,  consummation of the Merger is
subject to a number of other  conditions  that, if not satisfied or waived,  may
cause  the  Merger  not  to  be  consummated  and  the  Merger  Agreement  to be
terminated.  Each party's obligation to consummate the Merger is conditioned on,
among other things, the accuracy of the other party's representations, the other
party's  performance of its covenants,  the absence of a material adverse change
with respect to the other party, favorable legal opinions (including opinions to
the effect that the Merger will be treated for federal  income tax purposes as a
tax-free  reorganization),  and the  absence  of  legal  action  preventing  the
consummation of the Merger.

     Castelle's  obligation to consummate the Merger will be further conditioned
upon (i) the receipt of a letter from Coopers & Lybrand  L.L.P.  that the Merger
will be treated as a pooling of  interests  for  accounting  purposes;  and (ii)
holders of no more than 2% of the Ibex Common  Stock being  eligible to exercise
dissenters'  rights of  appraisal  under  California  law.  See "The  Merger and
Related Transactions -- Dissenters' Rights."

     Termination and Termination Fees

     Termination.  The Merger Agreement may be terminated by mutual agreement of
both  parties  or by either  party (i) as a result of a  material  breach by the
other party of any covenant or agreement set forth in the Merger Agreement; (ii)
if the timely  satisfaction  of any of the conditions for closing the Merger has
become  impossible;  (iii)  if any of  the  closing  conditions  have  not  been
satisfied  prior to the  Closing;  or (iv) if the  Closing  has not taken  place
before December 30, 1996.

     Termination Fees. If, prior to the Closing or the termination of the Merger
Agreement,  either Castelle or Ibex enters into negotiations or discussions with
a third party  concerning  the sale of all or  substantially  all of the assets,
business or stock of that company,  such company shall immediately reimburse the

                                       11
<PAGE>

other company for all expenses and costs incurred in connection with the Merger.
Should  either  company  enter into a letter of intent,  understanding  or other
agreement  relating  to the  sale  of all or  substantially  all of the  assets,
business or stock of that company,  such company shall immediately pay the other
company a termination fee in the amount of $250,000.

     Certain Federal Income Tax Consequences

     The Merger is expected to be a tax-free  reorganization  for federal income
tax  purposes,  so  that  no  gain  or  loss  will  be  recognized  by the  Ibex
shareholders  on the exchange of Ibex capital  stock for Castelle  Common Stock,
except to the extent that Ibex  shareholders  receive cash in lieu of fractional
shares or upon exercise of  dissenters'  rights.  The Merger  Agreement does not
require the parties to obtain a ruling from the Internal  Revenue  Service as to
the tax  consequences  of the Merger.  As a condition to  Castelle's  and Ibex's
obligations to consummate the Merger,  Castelle and Ibex are to receive opinions
at the effective time from their  respective  legal counsel that the Merger will
be treated as a tax-free  reorganization  for federal income tax purposes.  Ibex
shareholders  are urged to consult  their own tax  advisors  regarding  such tax
consequences. See "The Merger and Related Transactions -- Certain Federal Income
Tax Matters."

     Waivers and Amendments

     At any  time at or prior  to the  effective  time,  to the  extent  legally
allowed,  Castelle  or  Ibex,  without  approval  of the  shareholders  of  such
corporation,  may waive  compliance  with any of the  agreements  or  conditions
contained  in the Merger  Agreement  for the  benefit of that  company.  Neither
Castelle nor Ibex currently intends to waive compliance with any such agreements
or conditions.

     The Merger Agreement may be amended by Castelle and Ibex at any time before
or after approval of the Castelle shareholders or the Ibex shareholders,  except
that,  after such  approval,  no amendment may be made that requires the further
approval of the Castelle  shareholders or the Ibex shareholders under applicable
law, unless such approval is obtained.

     Accounting Treatment

     The  Merger is  intended  to be  treated  as a  pooling  of  interests  for
accounting purposes.  As a condition to Castelle's  obligation to consummate the
Merger,  Castelle is to receive a letter to such  effect from  Coopers & Lybrand
L.L.P.,  the  independent  auditors  for  Castelle.  See "The Merger and Related
Transactions -- Accounting Treatment."

     Dissenters' Rights

     If  the  Merger  Agreement  is  approved  by  the  required  vote  of  Ibex
shareholders  and is not abandoned or  terminated,  holders of Castelle and Ibex
Capital  Stock who did not vote in favor of the Merger  may, by  complying  with
Sections  1300  through  1312 of the  California  General  Corporation  Law (the
"California  Law"),  be entitled to  dissenters'  rights as  described  therein.
However,  it is a condition to Castelle's  obligation  to consummate  the Merger
that not more than 2% of the shares of Ibex Common  Stock and none of the shares
of Ibex Preferred  Stock be eligible to exercise  dissenters'  rights.  See "The
Merger and Related Transactions -- Dissenters' Rights."


                                       12

<PAGE>



     Merger Expenses and Fees and Other Costs

     Castelle and Ibex estimate that they will incur direct transaction costs of
approximately   $650,000   associated  with  the  Merger.   These   nonrecurring
transaction costs will be charged to operations upon consummation of the Merger.
In addition,  Castelle  anticipates  incurring a charge upon consummation of the
Merger of  $200,000  to  $300,000  to reflect  costs and  expenses  relating  to
integrating  the two companies.  See  "Unaudited  Pro Forma  Combined  Condensed
Financial Information" included elsewhere herein.

     Whether or not the Merger is consummated,  except as set forth below,  each
party will bear its own costs and expenses in connection with the Merger and the
transactions provided for therein.

     Castelle has agreed to reimburse  Ibex for the first $25,000 of audit fees,
costs and expenses  invoiced by Coopers & Lybrand L.L.P. and incurred by Ibex in
the audit by Coopers & Lybrand L.L.P.  of Ibex's fiscal years ended December 31,
1995 and 1994,  as well as one-half  of any  additional  audit  fees,  costs and
expenses  invoiced by Coopers & Lybrand  L.L.P.  Castelle has also agreed to pay
Unterberg  Harris a transaction fee of $250,000,  which amount has been included
in the direct  transaction  costs above, if the Merger is consummated.  Castelle
will also reimburse Unterberg Harris for the reasonable  out-of-pocket  expenses
incurred by  Unterberg  Harris in rendering  services to Castelle in  connection
with the  Merger.  See "The  Merger  and  Related  Transactions  --  Opinion  of
Financial Advisor to Castelle."

     Regulatory Matters

     Castelle and Ibex are not aware of any governmental or regulatory approvals
required for consummation of the Merger,  other than compliance with the federal
securities laws and applicable securities ("blue sky") laws of various states in
which Castelle and Ibex shareholders reside.

Additional Proposals for Castelle Shareholders

     In  addition to the  proposal  to approve  and adopt the Merger  Agreement,
Castelle  shareholders  will be asked at the Castelle Meeting to elect directors
to serve on the Board of  Directors  to serve until the next  Annual  Meeting of
Shareholders  and to ratify  the  appointment  of  Coopers & Lybrand  L.L.P.  as
Castelle's auditors for the fiscal year ended December 31, 1996. See "Additional
Matters for Consideration of Castelle Shareholders."

     Castelle's  Board of Directors has unanimously  approved the appointment of
Coopers & Lybrand L.L.P. as Castelle's auditors and unanimously  recommends that
the shareholders of Castelle approve the appointment of Coopers & Lybrand L.L.P.
as Castelle's auditors.

Additional Proposal for Ibex Shareholders

     In addition to the proposal to approve and adopt the Merger Agreement, Ibex
shareholders  will be asked at the Ibex  Meeting to approve the  adoption of the
1992  Stock  Option  Plan.  See  "Additional  Matter for  Consideration  of Ibex
Shareholders."

     Ibex's Board of Directors has unanimously approved the adoption of the 1992
Stock  Option Plan and  unanimously  recommends  that the  shareholders  of Ibex
approve the 1992 Stock Option Plan.

                                       13

<PAGE>



Market Price Data

     Castelle initiated public trading on December 20, 1995. The following table
sets forth the range of high and low bid prices  reported on the Nasdaq National
Market for Castelle Common Stock for the periods  indicated which are subsequent
to that date:

                                                         High           Low
Fiscal Year Ended December 31, 1995:
    Fourth Quarter (beginning December 21, 1995........  $8             $6 15/16
Fiscal Year Ended December 31, 1996:
    First Quarter......................................  $9 1/4         $7
    Second Quarter.....................................  $9 3/4         $7 1/4
    Third Quarter (through September 23, 1996).........  $8 1/4         $6 1/2


     There is no public trading market for Ibex securities.

     As of the  Record  Date,  October 7, 1996,  there  were  approximately  156
shareholders of record who held shares of Castelle Common Stock, as shown on the
records of  Castelle's  transfer  agent for such  shares.  As of the Ibex Record
Date, there were approximately 28 shareholders of record who held shares of Ibex
Common  Stock and 2  shareholders  of record who held  shares of Ibex  Preferred
Stock.

     Neither  Castelle nor Ibex has paid any cash  dividends on any class of its
stock.  Both Castelle and Ibex anticipate  that for the foreseeable  future they
will  continue  to  retain  any  earnings  for  use in the  operation  of  their
businesses.


                                       14

<PAGE>



                Selected Historical And Pro Forma Financial Data

     The following  selected  historical  financial  information of Castelle and
Ibex has been derived from their respective historical financial statements, and
should be read in  conjunction  with  such  financial  statements  and the notes
thereto,  included  elsewhere herein.  The selected pro forma combined financial
information is derived from the unaudited pro forma condensed combined financial
statements, which give effect to the Merger as a pooling of interests and should
be read in  conjunction  with such pro forma  statements  and the notes  thereto
included  in this  Prospectus.  The  pro  forma  information  is  presented  for
illustrative  purposes only and is not  necessarily  indicative of the operating
results or financial  position  that would have  occurred if the Merger had been
consummated  at the beginning of the periods  indicated,  nor is it  necessarily
indicative of future operating results or financial  position.  In addition,  it
does not  incorporate  any benefits from cost savings or synergies of operations
of the combined companies.


                                       15

<PAGE>



                  Castelle Consolidated Selected Financial Data
                    (in thousands, except per share amounts)

     The selected consolidated financial data of Castelle set forth below should
be read in conjunction with the consolidated  financial  statements of Castelle,
including  the notes  thereto,  and  "Management's  Discussion  and  Analysis of
Financial  Condition and Results of Operations of Castelle"  included  elsewhere
herein.  The  consolidated  statement  of  operations  data for the years  ended
December 31, 1991, 1992, 1993, 1994 and 1995 and the consolidated  balance sheet
data at December 31, 1991,  1992,  1993, 1994 and 1995 are derived from, and are
qualified by reference to, audited  consolidated  financial statements contained
in the  Prospectus.  The  consolidated  statement of operations data for the six
month periods ended June 30, 1995 and June 28, 1996 and the consolidated balance
sheet data at June 28, 1996 are derived from  unaudited  consolidated  financial
statements that have been prepared on the same basis as the audited consolidated
financial statements and, in the opinion of management, include all adjustments,
consisting  only  of  normal  recurring   adjustments,   necessary  for  a  fair
presentation of the results of operations and other information for such period.
These  historical  results  are not  necessarily  indicative  of the  results of
operations  to be expected  for the full fiscal year or any future  period.  See
"Management's  Discussion  and  Analysis of Financial  Condition  and Results of
Operations of Castelle."
<TABLE>
<CAPTION>


                                                      Year Ended December 31,                           Six Months Ended
                                      -------------------------------------------------------           ----------------
                                                                                                      June 30,    June 28,
                                         1991      1992       1993       1994        1995               1995        1996
                                         ----      ----       ----       ----        ----              ------      -----
Historical Consolidated Statement of                                                                 (unaudited) (unaudited)
Operations Data:
<S>                                    <C>       <C>        <C>        <C>         <C>                <C>         <C>    
     Net sales .....................   $ 9,067   $19,008    $17,787    $19,486     $25,082            $11,874     $13,425
     Cost of sales..................     5,457    10,563     11,346     11,503      13,571              6,385       7,117
                                        ------    ------     ------     ------      ------             ------      ------

        Gross profit................     3,610     8,445      6,441      7,983      11,511              5,489       6,308      
                                        ------     -----      -----      -----      ------              -----       -----     
                                               
     Operating expenses:                       
        Research and development.....    1,632     1,927      2,152      2,179       2,018                996       1,057      
        Sales and marketing..........    2,649     4,959      5,628      4,384       5,641              2,785       3,199      
        General and administrative...      850     1,313      1,977      1,446       1,405                623         718    
        Restructuring charge.........       --        --        615         --         --                  --          --  
                                        ------     -----     ------      -----       -----              -----       ----- 
          Total operating expenses...    5,131     8,199     10,372      8,009       9,064              4,404       4,974   
                                        ------     -----     ------      -----       -----              -----       ----- 
                                                   
     Operating income (loss).........   (1,521)      246     (3,931)       (26)      2,447              1,085       1,334
     Interest income (expense), net..      (11)     (157)      (349)      (481)       (296)              (192)        167
     Other income (expense), net.....       23        48       (515)       129         (53)                --         (75)
                                        ------     -----     -------     -----       -----              -----       -----
     Income (loss) before provision
        for income taxes.............   (1,509)      137     (4,795)      (378)      2,098                893       1,426
     Provision for (benefit from)
        income taxes                        --        11         --         --          74                 23          64
                                        ------     -----    -------      -----       -----              -----       -----
     Net income (loss)...............  $(1,509)  $   126    $(4,795)   $  (378)     $2,024             $  870      $1,362
                                        ======    ======     ======     ======       =====              =====       =====
     Net income (loss) per share (1).  $ (5.80)  $  0.09    $(12.11)   $ (0.91)     $ 0.77             $ 0.34      $ 0.35
                                        ======    ======     ======     ======       =====              =====       =====
     Shares used in per share
        calculation (1)                    260     1,330        396        414       2,673              2,648       3,887
                                         =====     =====     ======     ======       =====              =====       =====
     Pro forma net loss per share (1)                                   $(0.16)
                                                                         =====
     Pro forma shares used in per share
     calculation (1) ................                                    2,396
                                                                         =====


</TABLE>


                                       16

<PAGE>

<TABLE>
<CAPTION>


                                                                   As of December 31,                            June 28,
                                               ----------------------------------------------------------        --------
                                                      1991       1992        1993        1994       1995           1996
                                                      ----       ----        ----        ----       ----           ----
                                                                                                                (unaudited)
Historical Balance Sheet Data:
<S>                                                 <C>        <C>        <C>          <C>        <C>             <C>    
     Working capital (deficit)................      $1,872     $ 2,293    $  (765)     $  884     $8,849          $11,241
     Total assets.............................       5,144      10,114      8,623       7,124     14,667           15,696
     Short-term debt..........................         507       2,163      4,174       2,670        193               --
     Total shareholders' equity (deficit).....       2,390       3,493     (1,264)      1,355      9,289           11,709

</TABLE>


     (1) Computed on the basis described for net income (loss) per share in Note
2 of Notes to Consolidated Financial Statements.
    



                                       17

<PAGE>



                          Ibex Selected Financial Data
                    (in thousands, except per share amounts)

     The  selected  financial  data of Ibex set  forth  below  should be read in
conjunction with the financial  statements of Ibex, including the notes thereto,
and "Management's  Discussion and Analysis of Financial Condition and Results of
Operations of Ibex" included  elsewhere herein. The statement of operations data
for the years ended  December  31,  1994 and 1995 and the balance  sheet data at
December 31, 1994 and 1995 are derived from,  and are qualified by reference to,
audited  financial  statements  contained in this  Prospectus.  The statement of
operations data for the years ended December 31, 1991, 1992 and 1993 and the six
month  periods  ended  June 30,  1995 and 1996,  and the  balance  sheet data at
December  31,  1991,  1992 and 1993,  and at June 30,  1996,  are  derived  from
unaudited financial  statements that have been prepared on the same basis as the
audited  financial  statements  and, in the opinion of  management,  include all
adjustments,  consisting only of normal recurring  adjustments,  necessary for a
fair  presentation  of the results of operations and other  information for such
period.  These historical results are not necessarily  indicative of the results
of operations to be expected for the full fiscal year or any future period.  See
"Management's  Discussion  and  Analysis of Financial  Condition  and Results of
Operations of Ibex."
<TABLE>
<CAPTION>



                                                         Year Ended December 31,                          Six Months Ended
                                      ------------------------------------------------------------        ----------------
                                                                                                         June 30,     June 30,
                                           1991        1992        1993        1994        1995            1995         1996
                                           ----        ----        ----        ----        ----           ------       -----
Historical Statement of Operations Data (unaudited) (unaudited) (unaudited)                            (unaudited)  (unaudited)
<S>                                     <C>         <C>         <C>         <C>         <C>             <C>          <C>      
     Net sales .....................    $    521   $   1,020   $   1,791   $   2,708   $   3,091       $    1,393   $   2,075
     Cost of sales..................         218         290         554         691         732              355         444
                                        --------   ---------   ---------   ---------   ---------       ----------   ---------
        Gross profit................         303         730       1,237       2,017       2,359            1,038       1,631
                                        --------   ---------   ---------   ---------   ---------       ----------   ---------

     Operating expenses:
        Research and development.....         95         153         245         432         648              418         342
        Sales and marketing..........        128         368         638         988       1,391              660         760
        General and administrative...         68         197         289         256         262              129         153
                                        --------   ---------   ---------   ---------   ---------       ----------   ---------
          Total operating expenses...        291         718       1,172       1,676       2,301            1,207       1,255
                                        --------   ---------   ---------   ---------   ---------       ----------   ---------

     Operating income (loss).........         12          12          65         341          58             (169)        376
     Other income (expense), net.....         (4)         (4)          1          (8)         (4)              (5)         10
                                        --------   ---------   ---------   ---------   ---------       ----------   ---------
     Income (loss) before provision
        for income taxes.............          8           8          66         333          54             (174)        386
     Provision for (benefit
        from) income taxes...........          1           1          39         121          (5)             (21)        162
                                        --------   ---------   ---------   ---------   ---------       ----------   ---------
     Net income (loss)...............   $      7   $       7   $      27   $     212   $      59       $     (153)  $     224
                                        ========   =========   =========   =========   =========       ==========   =========
     Net income (loss) per share (1).   $   0.06   $     0.05  $    0.15   $    1.11   $    0.30       $    (1.13)  $    1.11
                                        ========   ==========  =========   =========   =========       ==========   =========
     Shares used in per
        share calculation (1)                116          151         174        191         199              135         201
                                             ===   ==========  ==========  =========   =========       ==========   =========
</TABLE>
<TABLE>
<CAPTION>


                                                                     As of December 31,                               June 30,
                                               -----------------------------------------------------------            --------
                                                   1991          1992         1993        1994       1995               1996
                                               (unaudited)   (unaudited)  (unaudited)                                (unaudited)
Historical Balance Sheet Data:
<S>                                              <C>            <C>          <C>         <C>        <C>               <C>   
     Working capital (deficit)................   $   11         $ 266        $ 302       $ 499      $ 593             $  828
     Total assets.............................      126           385          517         934        986              1,484
     Short-term debt..........................       68            --           28          28         75                 25
     Total shareholders' equity (deficit).....       32           341          368         608        700                924



</TABLE>

(1)  Computed on the basis  described  for net income (loss) per share in Note 2
     of Notes to Consolidated Financial Statements.  

                                       18

<PAGE>



              Unaudited Selected Pro Forma Combined Financial Data
                    (in thousands, except per share amounts)

     For  purposes  of the pro forma  operating  data,  Castelle's  consolidated
financial  statements for the five fiscal years ended December 31, 1995, and for
the six months  ended June 28, 1996 have been  combined  with  Ibex's  financial
statements  for the five fiscal years ended  December 31, 1995,  and for the six
months ended June 30,  1996.  Castelle  and Ibex  estimate  that they will incur
merger-related   expenses,   consisting   primarily  of  transaction  costs  for
investment bankers fees,  attorneys,  accountants,  financing printing,  and the
costs associated with integrating the two companies and other related charges of
approximately $850,000-$950,000. The pro forma combined balance sheet data gives
effect to such  expenses as if they had been  incurred as of June 28, 1996,  but
the pro forma condensed combined  statements of operations do not give effect to
such expenses.  No dividends have been declared or paid on Castelle Common Stock
or Ibex Capital Stock.

<TABLE>
<CAPTION>


                                                     Year Ended December 31,                         Six Months Ended
                                     ------------------------------------------------------          ----------------
                                                                                                    June 30,   June 30,
                                         1991       1992       1993       1994      1995              1995       1996
                                         ----       ----       ----       ----      ----             ------     ------
Pro Forma Condensed Combined          (unaudited)(unaudited)(unaudited)                           (unaudited) (unaudited)
Statement of Operations Data:
<S>                                    <C>        <C>        <C>        <C>       <C>               <C>        <C>    
  Net sales ........................   $ 9,588    $20,028    $19,578    $22,194   $28,173           $13,267    $15,500
  Cost of sales.....................     5,675     10,853     11,900     12,194    14,303             6,740      7,561
                                        ------     ------     ------     ------    ------            ------     ------
     Gross profit...................     3,913      9,175      7,678     10,000    13,870             6,527      7,939
                                         -----      -----      -----     ------    ------             -----      -----

  Operating expenses:
     Research and development........    1,727      2,080      2,397      2,611     2,666             1,414      1,399
     Sales and marketing.............    2,777      5,327      6,266      5,372     7,032             3,445      3,959
     General and administrative......      918      1,510      2,266      1,702     1,667               752        871
         Restructuring charge........       --         --        615         --        --                --         --
                                         -----      -----     ------     ------    ------             -----      -----
       Total operating expenses......    5,422      8,917     11,544      9,685    11,365             5,611      6,229
                                         -----      -----     ------     ------    ------             -----      -----

  Operating income (loss)............   (1,509)       258     (3,866)       315     2,505               916      1,710
  Interest income (expense), net.....      (11)      (157)      (349)      (481)     (296)             (192)       167
  Other income (expense), net........       19         44       (514)       121       (57)               (5)       (65)
                                         -----     ------     ------      -----     -----             -----      -----
  Income (loss) before provision for income
   taxes.............................   (1,501)       145     (4,729)       (45)    2,152               719      1,812
  Provision for (benefit from)
   income taxes                              1         12         39        121        69                 2        226
                                         -----     ------     ------      -----     -----            ------     ------
  Net income (loss).................. $ (1,502)   $   133    $(4,768)    $ (166)   $2,083           $   717    $ 1,586
                                      ========    =======    =======     ======    ======           =======    =======
  Net income (loss) per 
   Castelle share (1)                 $  (2.06)   $  0.07    $ (5.48)    $(0.17)   $ 0.59           $  0.21    $  0.33
                                      ========    =======    ========    ======    ======           =======    =======
  Shares used in per 
   share calculation (1)                   728      1,964         870       949     3,519             3,487      4,744
                                         =====     ======      ======     =====     =====            ======     ======
  Net income (loss) per Ibex share (1)   (8.34)      0.28      (22.18)    (0.71)     2.42              0.84       1.36
                                         =====     ======      ======     =====     =====            ======     ======
  Shares used in per share calculation (1) 180        480         215       235       859               851      1,162
                                         =====     ======      ======     =====     =====            ======     ======

</TABLE>
<TABLE>
<CAPTION>


                                                           As of December 31,                             June 28,
                                              ------------------------------------------------            -------         
                                              1991      1992      1993         1994       1995              1996
                                              ----      ----      ----         ----       ----              ----
Pro Forma Condensed Combined Balance     (unaudited)(unaudited)(unaudited)                              (unaudited)
    Sheet Data:
<S>                                         <C>       <C>        <C>         <C>        <C>               <C>    
  Working capital ......................    $1,883    $2,559     $(463)      $1,383     $9,442            $11,119
  Total assets    ......................     5,270    10,499      9,140       8,058     15,653             17,180
  Short term debt.......................       575     2,163      4,202       2,698        268                 25
     Shareholders' equity  .............     2,422     3,834      (896)       1,963      9,989             11,683

</TABLE>


     See "Pro Forma Combined Condensed  Financial  Information" and accompanying
notes thereto.

                                       19

<PAGE>



                           Comparative Per Share Data

     The  following  table  sets  forth  certain  historical  per share  data of
Castelle and Ibex and  combined  per share data on an unaudited  pro forma basis
after giving effect to the Merger on a pooling of interests basis of accounting.
Assuming a  designated  stock price of $7.00 for each share of  Castelle  common
stock,  791,541 shares of Castelle  Common Stock would be issued in exchange for
Ibex Common Stock and Ibex  Preferred  Stock in the Merger (and 58,451 shares of
Castelle  Common  Stock would be reserved  for  issuance  upon  exercise of Ibex
Options).  This data should be read in conjunction  with the selected  financial
data, the pro forma combined  condensed  financial  information and the separate
historical  financial statements of Castelle and Ibex and notes thereto included
elsewhere in this  Prospectus.  The pro forma  combined  financial  data are not
necessarily  indicative of the  operating  results that would have been achieved
had the Merger been consummated as of the beginning of the periods presented and
should not be construed as representative of future operations.

<TABLE>
<CAPTION>

                                                                                           Six Months       Six Months
                                                                                             Ended            Ended
                                                         Year Ended December 31,            June 30,         June 28,
                                                     ------------------------------        ----------       ----------
                                                     1993         1994         1995           1995             1996
                                                     ----         ----         ----        ----------       ----------
                                                                                           (unaudited)      (unaudited)
Castelle Historical Per Common Share:
<S>                                                <C>          <C>           <C>           <C>              <C>    
  Net income (loss)............................    $(12.11)     $ (0.91)      $ 0.77        $  0.34          $  0.35
  Book value (1)...............................    $(45.91)     $(32.48)      $ 2.68                         $  3.23
Pro Forma Combined - Per Castelle Share:
  Net income (loss) (2)........................    $ (5.48)     $ (0.17)      $ 0.59        $  0.21          $  0.33
  Book value (2)(4)............................    $(13.14)     $(11.75)      $ 2.27                         $  2.58

                                                                                           Six Months       Six Months
                                                                                             Ended            Ended
                                                          Year Ended December 31,           June 30,         June 30,
                                                     ------------------------------        ----------       ----------
                                                     1993         1994         1995           1995             1995
                                                     ----         ----         ----        ----------       ----------
Ibex Historical Per Common Share:                (unaudited)                               (unaudited)      (unaudited)
  Net income (loss) ...........................    $  0.15      $  1.11      $  0.30        $ (1.13)         $  1.11
  Book value (1)...............................    $  0.37      $  1.71      $  2.15                         $  3.35
Pro Forma Combined - Per Ibex Share:(3)
  Net income (loss) (3)........................    $(22.18)     $ (0.71)     $  2.42        $  0.84          $  1.36
  Book value (3)...............................    $(53.24)     $(47.61)     $  9.20                         $ 10.44

</TABLE>
 

(1)  The historical  book value per share is computed,  in the case of Castelle,
     by dividing shareholders' equity by the number of shares of Castelle Common
     Stock  outstanding  at the end of each period and, in the case of Ibex,  by
     dividing  shareholders' equity by the number of shares of Ibex Common Stock
     and Ibex Preferred Stock, on an as-converted basis,  outstanding at the end
     of each period.

(2)  Castelle  and Ibex  estimate  they will incur direct  transaction  costs of
     approximately $650,000 associated with the Merger, which will be charged to
     operations as incurred.  In addition, it is expected that after the Merger,
     Castelle will incur additional charges to operations,  currently  estimated
     to be between  $200,000  to  $300,000,  to reflect  costs  associated  with
     integrating the two companies.  The Pro Forma Combined Book Value Per Share
     data give effect to such costs  (estimated at $950,000 in total) as if such
     costs  had been  incurred  as of June 28,  1996.  See "Pro  Forma  Combined
     Condensed  Financial  Information" and accompanying notes thereto.  The pro
     forma condensed combined statement of operations do not give effect to such
     expenses.

(3)  The Pro Forma Combined-Per Ibex Share amounts are calculated by multiplying
     the Pro Forma Combined-Per Castelle Share amounts by the conversion rate in
     effect  assuming a fair market  value for  Castelle  Common Stock of $7 per
     share.

(4)  The Pro Forma  Combined  Book Value Per Share is computed  by dividing  pro
     forma  shareholders'  equity  by the pro  forma  number of shares of common
     stock outstanding at the end of each period.


                                       20

<PAGE>



                                  RISK FACTORS

     The following  risk factors  should be considered by holders of Ibex Common
and Ibex Preferred Stock in evaluating  whether to approve the Merger  Agreement
and thereby become  holders of Castelle  Common Stock and by holders of Castelle
Common Stock in evaluating whether to approve the issuance of shares of Castelle
Common  Stock  pursuant  to  the  Merger  Agreement.  These  factors  should  be
considered  in  conjunction  with the other  information  included in this Joint
Proxy Statement/Prospectus.

     Except for the  historical  information  contained  herein,  the  following
discussion   contains  forward-  looking   statements  that  involve  risks  and
uncertainties.  Castelle's  actual  results could differ  materially  from those
discussed  here.  Factors  that could cause or  contribute  to such  differences
include, but are not limited to, those discussed in "Risk Factors" as well as in
the  sections  entitled  "Summary,"  "Unaudited  Pro  Forma  Condensed  Combined
Financial   Information,"   "Business   of   Castelle,"   "Business   of  Ibex,"
"Management's  Discussion  and  Analysis of Financial  Condition  and Results of
Operations of Castelle" and  "Management's  Discussion And Analysis of Financial
Condition And Results of Operations of Ibex."

Castelle:  History of Losses; Accumulated Deficit

     Castelle has experienced  significant  operating losses and, as of December
31, 1995,  had an  accumulated  deficit of $12.7 million.  The  development  and
marketing  by  Castelle of new  products  will  continue to require  substantial
product development and other expenditures.  Although Castelle has recently been
profitable,  there can be no assurance that growth in net sales or profitability
will be  sustained.  See  "Management's  Discussion  and  Analysis of  Financial
Condition and Results of Operations of Castelle."

Fluctuations in Operating Results

     Castelle's and Ibex's revenues and operating results have fluctuated in the
past and the combined company's future revenues and operating results are likely
to do so in the future, particularly on a quarterly basis.

     Castelle's operating results may vary significantly from quarter to quarter
due to a variety  of  factors,  including  changes  in  Castelle's  product  and
customer mix, the  introduction of new products by Castelle or its  competitors,
constraints in Castelle's manufacturing and assembling operations,  shortages or
increases  in the prices of raw  materials  and  components,  changes in pricing
policy  by  Castelle  or  its  competitors,  a  slowdown  in the  growth  of the
networking market,  seasonality,  timing of expenditures and economic conditions
in the United States,  Europe and Asia.  Castelle's backlog at any given time is
not necessarily indicative of actual sales for any succeeding period. Castelle's
sales will often  reflect  orders  shipped in the same quarter in which they are
received.  In  addition,  a  significant  portion  of  Castelle's  expenses  are
relatively  fixed in nature,  and planned  expenditures  are based  primarily on
sales forecasts.  Therefore,  if Castelle inaccurately  forecasts demand for its
products,  the impact on net income may be magnified by Castelle's  inability to
adjust spending quickly enough to compensate for the net sales shortfall. Future
demand for Castelle's  products may be stronger  during the last quarter of each
year than the first  quarter of the  succeeding  year as the sales  personnel of
Castelle's  distributors  seek to meet their  annual  sales  quotas.  Castelle's
performance in any quarter is not  necessarily  indicative of its performance in
any subsequent quarter.  See "Management's  Discussion and Analysis of Financial
Condition and Results of Operations of Castelle."


                                       21

<PAGE>



     Ibex's  license  revenues are  difficult to forecast  because  Ibex's sales
cycle is relatively long and revenues in a particular quarter may be affected by
a relatively few large contracts that are subject to changes in customer budgets
and general economic conditions.  Because Ibex's operating expenses are based on
anticipated  revenue  levels  and a  high  percentage  of  Ibex's  expenses  are
relatively  fixed,  the  timing of  revenues  from a single  contract  can cause
significant  fluctuations  in operating  results from quarter to quarter and may
adversely affect operating results. In addition,  Ibex historically has operated
with little  backlog  because its  software  products are  generally  shipped as
orders  are  received.  As  a  result,  license  revenues  in  any  quarter  are
substantially  dependent on orders booked and shipped in that quarter.  Further,
certain contracts may constitute a significant  portion of the operating profits
for the quarter in which they are signed.  Accordingly,  revenues in any quarter
are  not  indicative  of  revenues  in  any  future  period.  See  "Management's
Discussion  and Analysis of Financial  Condition  and Results of  Operations  of
Ibex."

     The  combined  company's   quarterly  operating  results  may  continue  to
fluctuate  due to numerous  other  factors.  Some of these  factors  include the
demand  for  the  combined  company's  products,  seasonality,   customer  order
deferrals in  anticipation of new versions of the combined  company's  products,
the  introduction  of new  products  and product  enhancements  by the  combined
company or its  competitors,  including the effects of filling the  distribution
channels following such introductions and of potential delays in availability of
announced or anticipated products,  price changes by the combined company or its
competitors,  product  sales  mix,  the  mix of  license  and  service  revenue,
commencement  or conclusion of  significant  development  contracts,  changes in
foreign currency  exchange rates,  timing of acquisitions and associated  costs,
and timing of significant marketing and sales promotions.

Rapid Technological Change; Risks Associated with New Products

     The market for  Castelle's  and Ibex's  products  are  affected  by rapidly
changing  networking  technology and evolving industry  standards.  Castelle and
Ibex believe that their future success will depend upon their ability to enhance
their existing  products and to develop and introduce new products which conform
to or support emerging network telecommunications standards, are compatible with
a growing array of computer and peripheral devices, support popular computer and
network operating  systems and applications,  meet a wide range of evolving user
needs and achieve market acceptance.  There can be no assurance that Castelle or
Ibex will be  successful  in these  efforts.  In order to develop  new  products
successfully,  Castelle and Ibex are dependent upon timely access to information
about new  technological  developments and standards.  There can be no assurance
that Castelle or Ibex will have such access or that they will be able to develop
new products successfully and respond effectively to technological change or new
product announcements by others. Furthermore,  Castelle expects that printer and
other  peripheral  manufacturers  will add features to their  products that make
them more network-  accessible,  which may reduce demand for Castelle's  network
enhancement  devices.  There can be no assurance  that products or  technologies
developed   by  others  will  not  render  the   combined   company's   products
non-competitive  or  obsolete.  Ibex's  growth and the  fax-on-demand  market in
general  have been  negatively  affected by the growth of the World Wide Web and
the Internet. Although Ibex has new web/fax/email products in development, there
can be no assurance Ibex will compete successfully.  Castelle began shipping the
most recent  version of its FaxPress  product in June 1996 and began  shipping a
number of enhanced  versions of its print servers in the fourth quarter of 1995.
Complex  products  such  as  those  offered  by  Castelle  or Ibex  may  contain
undetected or unresolved hardware defects or software errors when they are first
introduced  or as new  versions  are  released.  Changes  in  Castelle's  or its
suppliers'   manufacturing   processes  or  the  inadvertent  use  of  defective
components  by Castelle  or its  suppliers  could  adversely  affect  Castelle's
ability to achieve  acceptable  manufacturing  yields and  product  reliability.
Castelle  and Ibex have in the past  discovered  hardware  defects and  software
errors  in  certain  of  their  new  products  and   enhancements   after  their

                                       22
<PAGE>

introduction.  Although neither  Castelle nor Ibex has not experienced  material
adverse  effects  resulting  from  any such  errors  to  date,  there  can be no
assurance that any such errors in the future will not result in adverse  product
reviews and a loss of or delay in market acceptance.

     Castelle  and Ibex have  incurred,  and the  combined  company  expects  to
continue to incur,  substantial  expenses  associated with the  introduction and
promotion of new products.  There can be no assurance that the expenses incurred
will not exceed  development  budgets or that new products  will achieve  market
acceptance  and  generate  sales  sufficient  to offset  development  costs.  In
addition,  programs as complex as those offered by Castelle and Ibex may contain
a number of undetected  errors or bugs when they are first  introduced or as new
versions  are  released.  There can be no  assurance  that,  despite  testing by
Castelle  and Ibex and by  third-party  test sites,  errors will not be found in
future  releases of the  combined  company's  products,  which would  negatively
affect market acceptance of these products.

     The introduction of new or enhanced  products requires Castelle and Ibex to
manage the transition from older products. Ibex must encourage the transition of
customers to new product releases in order to minimize the costs associated with
supporting   multiple  product  versions.   Castelle  must  manage  new  product
introductions so as to minimize disruption in customer ordering patterns,  avoid
excessive levels of older product  inventories and ensure that adequate supplies
of new products can be delivered  to meet  customer  demands.  Castelle and Ibex
have from time to time experienced delays in the shipment of new products. There
can be no assurance that future product transitions will be managed successfully
by the combined  company.  See "Business of Castelle -- Products,"  "-- Research
and  Development,"  "-- Sales,  Marketing and Distribution" and "-- Competition"
and "Business of Ibex -- Products,"  "-- Research and  Development,"  "-- Sales,
Marketing and Distribution" and "-- Competition."

Key Personnel

     Castelle's  and Ibex's  success  depends to a  significant  degree upon the
continued  contributions  of the combined  company's key management,  marketing,
product development and operational personnel.  In the past fifteen months, both
Castelle and Ibex have filled a number of key management positions.  The success
of the combined company will depend to a large extent upon its ability to retain
and continue to attract highly skilled  personnel.  Competition for employees in
the  computer  industry  is  intense,  and  there can be no  assurance  that the
combined company will be able to attract and retain enough qualified  employees.
If the  business  of the  combined  company  grows,  it may become  increasingly
difficult for it to hire,  train and  assimilate  the new employees  needed.  In
addition,  it is possible that the business changes or uncertainty brought about
by the Merger may cause key  employees  to leave  Castelle  or Ibex prior to the
Merger or to leave the  combined  company  following  the Merger.  The  combined
company's  inability to retain and attract key  employees  could have a material
adverse  effect on the combined  company's  product  development  and results of
operations.  Neither Castelle or Ibex carries any key person life insurance with
respect to any of its personnel. See "Management of Castelle" and "Management of
Ibex."

Product Transition; Risk of Product Returns and Inventory Obsolescence

     From time to time, the combined company may announce new products,  product
versions,  capabilities  or  technologies  that have the potential to replace or
shorten the life cycles of existing  products.  The combined  company has in the
past experienced increased returns of a particular product version following the
announcement  of a planned  release of a new version of that  product.  Although

                                       23
<PAGE>

Castelle and Ibex provide allowances for anticipated  returns,  and believes its
existing  policy results in the  establishment  of allowances that are currently
adequate,  there can be no assurance  that product  returns will not exceed such
allowances  in the future.  The release of a new product or product  version may
also result in the write-down of product in inventory if such inventory  becomes
obsolete.

Competition and Price Erosion

     The computer  software and hardware markets in which both Castelle and Ibex
participate  are  highly  competitive  and  characterized  by rapid  change  and
improvements in technology along with constant  pressure to reduce prices.  Many
of the combined company's competitors will have substantially greater financial,
marketing, recruiting and training resources than the combined company.

     Ibex's principal competitors include Faxback, Inc. and Copia International,
Inc. and numerous smaller  software  vendors.  Ibex also faces  competition from
systems integrators who configure hardware and software into customized systems.
In addition,  new companies  continue to enter the market. As the market becomes
increasingly  competitive,  many  companies are offering  lower priced  products
which compete with Ibex products.

     The network enhancement products market is highly competitive, and Castelle
believes that such competition will intensify in the future.  Castelle currently
competes  principally  in the market for network  print  servers and network fax
servers  and  software.  Increased  competition,   direct  and  indirect,  could
adversely  affect  Castelle's  business and operating  results  through  pricing
pressure,  loss of market  share  and other  factors.  In  particular,  Castelle
expects that,  over time,  average  selling prices for its print server products
may decline as the market for these products becomes  increasingly  competitive.
Any material  reduction in the average  selling  prices of  Castelle's  products
would  require  Castelle to increase unit sales in order to avoid a reduction in
net sales and would  adversely  affect gross margins.  There can be no assurance
Castelle  will be able to maintain  the current  average  selling  prices of its
products or the related gross margins.

     The  principal  competitive  factors  affecting  the market for  Castelle's
products include product functionality,  performance, quality, reliability, ease
of use, quality of customer training and support,  name recognition,  price, and
compatibility  and conformance  with industry  standards and changing  operating
system environments.  Several of Castelle's existing and potential  competitors,
most  notably  the  Hewlett-Packard   Company   ("Hewlett-Packard")   and  Intel
Corporation  ("Intel"),  have  substantially  greater  financial,   engineering,
manufacturing  and  marketing  resources  than  does  Castelle.   Castelle  also
experiences  competition  from a number of other  companies.  In addition to its
current competitors, Castelle may face substantial competition from new entrants
into  the  network  enhancement  market,   including  established  and  emerging
computer,  computer  peripherals,  communications  and  software  companies.  As
Castelle  develops and  introduces  more software  products,  it may  experience
increasing  competition  from  companies  such as Symantec  Corp.  and  Cheyenne
Software  Inc.  There can be no assurance  that  competitors  will not introduce
products  incorporating  technology  more  advanced  than that of  Castelle.  In
addition,  certain competing  methods of communications  such as the Internet or
electronic mail could adversely  affect the market for fax products.  Certain of
Castelle's existing and potential  competitors are manufacturers of printers and
other  peripherals,  and these competitors may develop closed systems accessible
only through  their own  proprietary  servers.  There can be no  assurance  that
Castelle will be able to compete  successfully or that competition will not have
a material  adverse  effect on Castelle's  business and operating  results.  See
"Management's  Discussion  and  Analysis of Financial  Condition  and Results of
Operations of Castelle" and "Business of Castelle -- Competition."


                                       24

<PAGE>



Combination of the Companies; Possible Adverse Effect on Financial Results

     The  combination  of the two  organizations  will require the dedication of
management  resources,  which  will  temporarily  distract  attention  from  the
day-to-day business of the combined company.  There can be no assurance that the
combination  will  be  completed  without   disrupting   Castelle's  and  Ibex's
businesses.  Should Castelle and Ibex not be able to combine their businesses in
a timely and coordinated  fashion,  it could result in a material adverse effect
on  operating  results.  Neither  management  group has  experience  in business
combinations of this size. Realization of the anticipated benefits of the Merger
will depend in part upon the successful  combination of the senior management of
the two companies.  The inability to successfully combine such senior management
or the loss of the  services  of one or more of these key  persons  could have a
material adverse effect on the combined companies.  The senior management of the
combined  companies  also must  continue to attract  and retain key  management,
technical,  sales and marketing  personnel and continue to motivate employees in
light of  organizational  changes  resulting from the Merger will be critical to
the  combined  company's  future  operations.   In  addition,   the  anticipated
combination  of the  two  companies  may  cause  uncertainties,  hesitation  and
possible dissatisfaction among customers and potential customers of Castelle and
Ibex.

     Castelle  and Ibex  estimate  they will incur direct  transaction  costs of
approximately   $650,000   associated  with  the  Merger.   These   nonrecurring
transaction costs will be charged to operations upon consummation of the Merger.
In  addition,   Castelle   anticipates   incurring  an  additional  charge  upon
consummation of the Merger of $200,000 to $300,000 to reflect costs and expenses
relating to  integrating  the two  companies.  See "Unaudited Pro Forma Combined
Condensed Financial Information" included elsewhere herein.

Castelle:  Concentration of Distributors; Distribution Risks

     Castelle  sells its  products  primarily  through a two-tier  domestic  and
international   distribution  network,  with  Castelle's   distributors  selling
Castelle's products to value-added  resellers  ("VARs"),  system integrators and
other  resellers.  The personal  computer and networking  products  distribution
industry has been characterized by rapid change, including consolidations due to
the financial  difficulties  of  distributors  and the emergence of  alternative
distribution  channels.  In addition,  an  increasing  number of  companies  are
competing for access to these  channels.  Castelle's  five largest  distributors
accounted  for 77% of its  net  sales  in the  first  six  months  of  1996  and
approximately   70%  and  67%  of  Castelle's   net  sales  in  1995  and  1994,
respectively.  Macnica Corporation  ("Macnica"),  Castelle's  principal Japanese
distributor,  and  Ingram  Micro,  Inc.  ("Ingram  Micro"),  Castelle's  largest
domestic  distributor,  accounted for approximately 38% and 16% of its net sales
in the first six months of 1996,  respectively,  29% and 18%,  respectively,  of
Castelle's net sales in 1995, and 17% and 23%,  respectively,  of Castelle's net
sales in 1994. Castelle's  distributors  typically represent other product lines
that are  complementary  to, or compete with, those of Castelle.  While Castelle
attempts  to  encourage  its  distributors  to  focus  on its  products  through
marketing and support programs,  these  distributors may give higher priority to
products of other suppliers, thereby reducing the efforts they devote to selling
Castelle's  products.  In  particular,  certain  of its  competitors,  including
Hewlett-Packard  and Intel,  sell a substantially  higher total dollar volume of
products through several of Castelle's large United States  distributors and, as
a result,  Castelle  believes such distributors give higher priority to products
offered  by such  competitors.  Castelle's  distributors  are not  contractually
committed to future  purchases  of  Castelle's  products  and could  discontinue
carrying  Castelle's  products at any time for any reason. In addition,  because
Castelle  is  dependent  on a small  number of  distributors  for a  significant
portion  of the  sales  of its  products,  the loss of any of  Castelle's  major
distributors or their inability to satisfy their payment obligations to Castelle
could have a significant  adverse  effect on  Castelle's  business and operating
results.  Castelle has a stock rotation policy with certain of its  distributors

                                       25
<PAGE>

which allows them to return marketable  inventory against  offsetting orders. In
addition, in the event Castelle reduces its prices,  Castelle credits certain of
its  distributors  for the  difference  between the  purchase  price of products
remaining in their inventory and Castelle's reduced price for such products.  In
addition,  due to industry  conditions or the actions of competitors,  inventory
levels of  Castelle's  products  held by  distributors  could  become  excessive
resulting in product returns and inventory write-downs.  In 1993, as a result of
offering  extended  payment  terms  and  other  pricing  promotions  to  certain
distributors,  Castelle  experienced  returns  from  distributors  which  had  a
material  adverse  effect  on  Castelle's  operating  results.  There  can be no
assurance that in the future such returns and price  protection  will not have a
material  adverse  effect on Castelle's  operating  results.  See  "Management's
Discussion  and Analysis of Financial  Condition  and Results of  Operations  of
Castelle" and "Business of Castelle -- Sales, Marketing and Distribution."

Lack of Product Revenue Diversification

     Ibex  derives  substantially  all of its  revenues  from its  fax-on-demand
software.  Castelle derived  substantially  all of its sales from the Fax Server
and Print Server line of  products.  Castelle  expects  that these  hardware and
software  products  will  continue  to account  for a majority  of the  combined
company's  sales in the  future.  A decline  in demand for these  products  as a
result of  competition,  technological  change  or other  factors  would  have a
material adverse effect on the combined company's results of operations.

Dependence on Suppliers and Subcontractors

     Castelle's  and  Ibex's  products  incorporate  or  require  components  or
sub-assemblies procured from third-party suppliers.  Certain of these components
or  sub-assemblies  are  available  only from a single  source,  and  others are
available  only from  limited  sources.  Certain key  components  of  Castelle's
products,  including  Token Ring  interface  modules  from Silcom  Manufacturing
Technology Inc., a modem chip set from Rockwell International  Corporation and a
microprocessor from Motorola,  Inc.  ("Motorola"),  are currently available from
only single sources.  Ibex software requires voice and fax boards available only
from Dialogic  Corporation.  In addition,  Castelle  subcontracts  a substantial
portion of its  manufacturing  to third  parties,  and there can be no assurance
that these subcontractors will be able to support the manufacturing requirements
of Castelle. Castelle does not have long-term supply contracts with these or any
other sole or limited  source  vendors  and  subcontractors  other than a signed
agreement  with  a  Taiwanese  company,   and  purchases  these  components  and
sub-assemblies  on a purchase  order basis.  Castelle's  ability to obtain these
components  and  sub-assemblies  is  dependent  upon its  ability to  accurately
forecast  customer  demand  for its  products  and to  anticipate  shortages  of
critical  components  or  sub-assemblies   created  by  competing  demands  upon
suppliers.  If  Castelle or Ibex were  unable to obtain a  sufficient  supply of
high-quality components or sub-assemblies from its current sources,  Castelle or
Ibex could experience delays in obtaining such components or sub-assemblies from
other  sources.  Resulting  delays or  reductions  in  product  shipments  could
adversely affect Castelle's and Ibex's business and operating results and damage
customer relationships.  Furthermore, a significant increase in the price of one
or more of these components or sub-assemblies or Castelle's  inability to obtain
lower  component  or  sub-assembly  prices  in  response  to  competitive  price
reductions could adversely affect Castelle's operating results.

     Castelle  augments its product offerings by obtaining access to third-party
products and  technologies  in areas outside of its core  competencies  or where
Castelle believes internal  development of products and technologies is not cost
effective.  Castelle's  third-party  product  supplier  is  SerComm  Corporation
("SerComm")  for  certain  of  Castelle's   print  server   products.   Although
third-party products have contributed negligible net sales in the past, Castelle

                                       26
<PAGE>

anticipates  that such products will constitute an increasing  percentage of net
sales in the future.  There can be no assurance that these products will produce
gross margins comparable to those of Castelle's  internally-generated  products.
Castelle's  agreements with its third-party product suppliers have limited terms
of two years,  subject to earlier  termination  upon the  occurrence  of certain
events.  Extensions of the terms of these agreements require the consent of both
Castelle and its  supplier.  Although,  to date,  Castelle  has not  experienced
supply  problems  that were  material to  Castelle's  business,  there can be no
assurance  that this  third-party  will continue to provide the  quantities  and
quality of  products  needed by  Castelle  or that such party will  upgrade  its
respective   products  on  a  timely  basis.   The   termination  of  Castelle's
relationships  with  SerComm  could  result in delays or  reductions  in product
shipments,  which could have a material  adverse effect on Castelle's  business,
operating  results  and  financial  condition.  See  "Business  of  Castelle  --
Manufacturing."

Castelle:  Government Regulation

     Certain aspects of the networking  industry in which Castelle  competes are
regulated  both in the United  States and in foreign  countries.  Imposition  of
public  carrier  tariffs,  taxation  of  telecommunications   services  and  the
necessity of incurring substantial costs and expenditure of managerial resources
to  obtain  regulatory  approvals,   particularly  in  foreign  countries  where
telecommunications  standards  differ  from  those in the United  States,  could
adversely affect  Castelle's  business and operating  results.  In addition,  if
Castelle is unable to obtain regulatory  approvals within a reasonable period of
time,  Castelle's  operating  results  could be adversely  affected.  Castelle's
products  must comply with a variety of equipment,  interface  and  installation
standards  promulgated  by  communications  regulatory  authorities in different
countries.  Changes in government policies,  regulations and interface standards
could  require the  redesign of products and result in product  shipment  delays
which could materially and adversely affect Castelle's operating results.

Ibex:  Dependence on Distribution Partners; Distribution Risks

     Ibex's sales are made primarily through value-added  resellers ("VARs") and
direct-to-end-user  sales.  Accordingly,  the combined company will be dependent
upon the continued viability and financial stability of such VARs, which are not
under the direct  control of Ibex. The future growth and success of the combined
company will continue to depend in large part upon its resale  channels.  If its
resellers  were to experience  financial  difficulties,  the combined  company's
results of  operations  could be  adversely  affected.  Additionally,  there are
increasing  numbers of  companies  competing  for  access to these  distribution
channels.  VARs often  carry  competing  products.  Ibex's VARs  typically  have
limited  promotional  resources for which there is intense  competition.  Ibex's
arrangements  with its respective  VARs may be terminated by either party at any
time without cause. There can be no assurance that VARs will continue to provide
the combined company's products with adequate levels of promotional  support and
customer  support.  Failure to do so would have a material adverse effect on the
combined company's results of operations.

International Sales

     Sales to customers  located outside Canada and the United States  accounted
for  approximately  56% of net sales for the six months ended June 30, 1996, and
52% and 42% of  Castelle's  net  sales in 1995 and  1994,  respectively.  Ibex's
international sales for the same period represented approximately 1%, 16% and 4%
of Ibex's net sales. Castelle sells its products in 39 foreign countries through
approximately  70  international  distributors.  A total of 12  distributors  in
Germany,   Japan,   the  Netherlands  and  the  United  Kingdom   accounted  for

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<PAGE>

approximately  44% and 32% of Castelle's  international  sales in 1995 and 1994,
respectively.  Macnica, Castelle's principal Japanese distributor, accounted for
approximately  38% of net sales for the six  months  ended  June 30,  1996,  and
approximately   29%  and  17%  of  Castelle's   net  sales  in  1995  and  1994,
respectively.  Castelle  expects  that  international  sales  will  continue  to
represent a significant  portion of the combined  company's product revenues and
that the combined  company will be subject to the normal risks of  international
sales,  such as export  laws,  currency  fluctuations,  longer  payment  cycles,
greater  difficulties in accounts receivable  collections and the requirement of
complying  with a wide  variety  of  foreign  laws.  Although  Castelle  has not
previously  experienced  any  difficulties  under  foreign law in exporting  its
products to other countries, there can be no assurance that the combined company
will not experience such  difficulties in foreign  countries in the future.  Any
such difficulties would have a material adverse effect on the combined company's
international  sales. In addition,  because both companies invoice their foreign
sales in U.S.  dollars,  fluctuations  in exchange rates could affect demand for
the combined  company's  products by causing their prices to be out of line with
products  priced in the local  currency.  See also  "Dependence  on  Proprietary
Rights; Uncertainty of Obtaining Licenses." Castelle may experience fluctuations
in European  sales on a quarterly  basis  because  European  sales may be weaker
during  the third  quarter  than the  second  quarter  due to  extended  holiday
shutdowns in July and August. See "Business of Castelle -- Sales,  Marketing and
Distribution."

Dependence on Proprietary Rights; Uncertainty of Obtaining Licenses

     Castelle's  and  Ibex's  success  depends  to a certain  extent  upon their
technological  expertise and proprietary software technology.  Castelle and Ibex
rely upon a combination of contractual protections and copyright,  trademark and
trade  secret laws to  establish  and protect  their  technologies.  Despite the
precautions taken by them, it may be possible for unauthorized  third parties to
copy  Castelle's  and Ibex's  products or to reverse  engineer or obtain and use
information that Castelle and Ibex regard as proprietary.  In addition, the laws
of  some  foreign  countries  either  do  not  protect   Castelle's  and  Ibex's
proprietary rights or offer only limited  protection.  Given the rapid evolution
of  technology  and  uncertainties  in  intellectual  property law in the United
States and internationally, there can be no assurance that Castelle's and Ibex's
current  or  future  products  will not be  subject  to  third-party  claims  of
infringement. Any litigation to determine the validity of any third-party claims
could  result in  significant  expense to  Castelle  and  divert the  efforts of
Castelle's technical and management personnel, whether or not such litigation is
determined in favor of Castelle.  In the event of an adverse  result in any such
litigation,  Castelle  could be  required  to expend  significant  resources  to
develop non-infringing  technology or to obtain licenses to the technology which
is the subject of the litigation.  There can be no assurance that Castelle would
be successful in such  development or that any such licenses would be available.
Castelle and Ibex also rely on technology licenses from third parties. There can
be no assurance  that these  licenses  will continue to be available to Castelle
upon  reasonable  terms,  if at all. Any impairment or termination of Castelle's
relationship with third-party  licensors could have a material adverse effect on
Castelle's and Ibex's business and operating results.  There can be no assurance
that   Castelle's   and   Ibex's   precautions   will  be   adequate   to  deter
misappropriation or infringement of its proprietary  technologies.  Furthermore,
while  Castelle and Ibex have obtained  federal  registration  for many of their
trademarks  in the  United  States,  certain of their  trademarks  have not been
registered in the United  States,  and neither  Castelle nor Ibex has registered
any of their trademarks in foreign jurisdictions. There can be no assurance that
Castelle's and Ibex's use of such unregistered  trademarks will not be contested
by third  parties in the future.  See "Business --  Proprietary  Rights" and "--
Research and Development."

     Castelle  and  Ibex  have   received,   and  may  receive  in  the  future,
communications  asserting that their products infringe the proprietary rights of
third  parties  or  seeking  indemnification   against  such  infringement.   In

                                       28
<PAGE>

particular,  Ibex has received  notification that its product name "Fax-It-Back"
potentially  infringes the trademark  "Faxback" owned by Faxback,  Inc. Ibex and
Faxback  have  entered  into  settlement  negotiations  with  respect  to Ibex's
continued use of the Fax-It-Back name.  Castelle and Ibex are not aware that any
of their respective products,  trademarks,  or other proprietary rights infringe
the property  rights of third parties.  However,  there can be no assurance that
third parties will not assert  infringement  claims against the combined company
in the  future  with  respect to  current  or future  products  or that any such
assertion   may  not  require  the  combined   company  to  enter  into  royalty
arrangements or result in costly litigation.  As the number of software products
in the  industry  increases  and the  functionality  of these  products  further
overlap,  Castelle  believes that software  developers  may become  increasingly
subject to infringement  claims. Any such claims,  with or without merit, can be
time consuming and expensive to defend.  There can be no assurance that any such
intellectual property litigation that may be brought in the future will not have
a material  adverse  effect on the  combined  company's  financial  position  or
results of operations.  As a result of such claims or litigation,  it may become
necessary or desirable in the future for the combined company to obtain licenses
relating  to one or more of its  products  or  relating  to  current  or  future
technologies,  and there can be no  assurance  that it would be able to do so on
commercially  reasonable terms. See "Business of Castelle -- Proprietary Rights"
and "-- Research and Development"  and "Business of Ibex -- Proprietary  Rights"
and "-- Research and Development."

Possible Volatility of Castelle Stock Price

     The prices for Castelle  Common Stock have  fluctuated  widely in the past.
Sales of substantial  amounts of Common Stock, or the perception that such sales
could occur,  could  adversely  affect  prevailing  market prices for the Common
Stock. The management of Castelle  believes that such fluctuations may have been
caused by announcements of new products,  quarterly  fluctuations in the results
of operations and other factors, including changes in conditions of the personal
computer  industry in general.  Stock  markets have  experienced  extreme  price
volatility in recent years. This volatility has had a substantial  effect on the
market  prices of  securities  issued by  Castelle  and  other  high  technology
companies,  often for reasons  unrelated  to the  operating  performance  of the
specific companies.  Castelle  anticipates that prices for Castelle Common Stock
may  continue  to be volatile  following  the  Merger.  Such future  stock price
volatility  for Castelle  Common Stock may provoke the  initiation of securities
litigation which may divert substantial management resources and have an adverse
effect on Castelle or the combined company's results of operations. In addition,
the total number of shares  issuable in connection  with the Merger is fixed and
will not be adjusted based on changes in the relative trading prices of Castelle
Common Stock.  The trading price of Castelle  Common Stock at the effective time
of the  Merger  may vary  from the price as of the date  hereof,  or the date on
which  shareholders  vote on the Merger, as a result of changes in the business,
operations,  financial  results  and  prospects  of  Castelle  or  Ibex,  market
assessments of the likelihood that the Merger will be consummated and the timing
thereof, and other  business-specific  factors.  These fluctuations,  as well as
general  economic,  political  and  market  conditions,  such as  recessions  or
international  currency  fluctuations,  may adversely affect the market price of
the Common Stock.  See "The Merger and Related  Transactions  -- Reasons for the
Merger."

Castelle:  Future Capital Requirements

     Although  Castelle believes that its existing capital  resources,  expected
cash flow from  operations  and available  lines of credit will be sufficient to
meet its anticipated  capital  requirements at least through the next 12 months,
Castelle may be required to seek additional equity or debt financing. The timing
and amount of such capital  requirements  cannot be  determined at this time and
will depend on a number of factors, including demand for Castelle's existing and

                                       29
<PAGE>

new products and changes in technology in the networking industry.  There can be
no assurance that such  additional  financing will be available on  satisfactory
terms when  needed,  if at all.  See  "Management's  Discussion  and Analysis of
Financial  Condition  and Results of  Operations  of Castelle --  Liquidity  and
Capital Resources."

Castelle:  Voting Control by Officers, Directors and Affiliates

     At August 31, 1996,  Castelle's officers and directors and their affiliates
beneficially  owned  approximately  37.91% of the  outstanding  shares of Common
Stock. Accordingly, together they had the ability to significantly influence the
election  of  Castelle's   directors  and  other  corporate   actions  requiring
shareholder  approval.  Were the  Merger  to have  closed on  August  31,  1996,
Castelle's  officers,  directors and their  affiliates  would have  beneficially
owned  approximately  30.70% of the  outstanding  shares of Common  Stock.  Such
concentration  of  ownership  may have the  effect  of  delaying,  deferring  or
preventing a change in control of Castelle.

Castelle:  Certain Charter Provisions

     Castelle's Board of Directors has authority to issue up to 2,000,000 shares
of  Preferred  Stock  and  to  fix  the  rights,  preferences,   privileges  and
restrictions,  including voting rights, of these shares without any further vote
or action by the  shareholders.  The rights of the  holders of the Common  Stock
will be subject to, and may be adversely  affected by, the rights of the holders
of any  Preferred  Stock  that may be  issued in the  future.  The  issuance  of
Preferred  Stock,  while  providing  desirable  flexibility  in connection  with
possible  acquisitions  and other corporate  purposes,  could have the effect of
making  it more  difficult  for a third  party  to  acquire  a  majority  of the
outstanding voting stock of Castelle, thereby delaying,  deferring or preventing
a change in control of  Castelle.  Furthermore,  such  Preferred  Stock may have
other rights,  including  economic rights,  senior to the Common Stock, and as a
result,  the issuance thereof could have a material adverse effect on the market
value of the Common Stock.

Shares Eligible for Future Sale

     Castelle  will issue up to 850,000  shares of Castelle  Common Stock in the
Merger or upon the subsequent exercise of the outstanding Ibex Options which are
being assumed in connection  with the Merger.  In general,  the shares issued in
the Merger,  other than to Ibex affiliates,  will be freely tradeable  following
the Merger,  although  persons  who may be  considered  affiliates  of Ibex have
agreed that they will not transfer, sell, exchange,  pledge or otherwise dispose
of any Castelle Common Stock now held by such holders or received by them in the
Merger from 30 days prior to the anticipated  effective time of the Merger until
the date Castelle shall have publicly  released  financial  results for a period
that includes at least 30 days of combined  operations of Castelle and Ibex (the
"Affiliates Expiration Date"). Immediately after the Affiliates Expiration Date,
these  shares of Castelle  Common  Stock will be eligible for sale in the public
market,  subject to compliance  with Rules 144 and 145 under the Securities Act.
In  addition,  holders  of Ibex  Preferred  Stock have been  granted  the right,
effective  upon the Merger,  to register the Castelle  Common Stock  received in
connection  with the  Merger  for  resale  to the  public,  subject  to  certain
restrictions  and the  approval  of  such  rights  by the  existing  holders  of
registration  rights.  In  addition,  holders of Ibex Common  Stock will receive
limited  registration  rights in connection with the Merger.  The sale of any of
the foregoing shares of Castelle Common Stock may cause substantial fluctuations
in the price of Castelle Common Stock over short time periods.


                                       30

<PAGE>



                               RECENT DEVELOPMENTS

Litigation

     In March 1995,  Ibex  commenced an action  before the  Trademark  Trial and
Appeal Board of the United  States  Patent and  Trademark  Office to cancel U.S.
Trademark Registration for the FAXBACK mark owned by Faxback, Inc. of Beaverton,
Oregon.  Prior to  commencing  the  cancellation  action,  Ibex had not used the
FAXBACK  or  FAX-IT-BACK   marks.   Faxback,   Inc.,  seeking  to  maintain  its
registration,  has  contested  Ibex's  petition  to  cancel  and the  action  is
presently in the  discovery  stage.  Recently  (subsequent  to the filing of the
cancellation  action),  Ibex  posted  notices  of  the  pending  release  of and
advertisements  for its  FAX-IT-BACK  product  on its  web  site.  In  response,
Faxback,  Inc.  has filed an  action in  federal  district  court in Oregon  for
trademark  infringement  against  Ibex  for  its  use of the  FAX-IT-BACK  mark.
Faxback,  Inc.  has not yet served the  complaint  on Ibex and the parties  have
agreed  that the  complaint  will not be served on Ibex  pending  the outcome of
settlement  negotiations  being  conducted  by the parties.  Management  of Ibex
believes  that the  resolution  of this matter will not have a material  adverse
effect on Ibex.


                                       31

<PAGE>



                              THE CASTELLE MEETING

Date, Time and Place of Meeting

     The Castelle  Meeting will be held on Tuesday,  November 19, 1996,  at 9:00
a.m., local time, at Castelle's offices located at 3255-3 Scott Boulevard, Santa
Clara, California.

Record Date, Voting Rights and Outstanding Shares

     Only holders of record of Castelle Common Stock at the close of business on
the Record Date are entitled to vote at the Castelle Meeting. As of the close of
business on the Record  Date,  there were  3,621,261  shares of Castelle  Common
Stock  outstanding  and entitled to vote,  held of record by  approximately  156
shareholders.  Each Castelle  shareholder is entitled to one vote for each share
of Castelle Common Stock held as of the Record Date.

     Each holder of record of Common  Stock on such date will be entitled to one
vote for each share held on all  matters to be voted upon.  With  respect to the
election of directors, shareholders may exercise cumulative voting rights. Under
cumulative  voting,  each  holder of Common  Stock will be  entitled to five (5)
votes for each share held. Each shareholder may give one candidate, who has been
nominated prior to voting, all the votes such shareholder is entitled to cast or
may  distribute  such votes among as many such  candidates  as such  shareholder
chooses.  (However, no shareholder will be entitled to cumulate votes unless the
candidate's  name has been placed in nomination prior to the voting and at least
one shareholder has given notice at the meeting,  prior to the voting, of his or
her  intention  to  cumulate  votes.)  Unless  the  proxyholders  are  otherwise
instructed,  shareholders,  by means of the accompanying  proxy,  will grant the
proxyholders discretionary authority to cumulate votes.

     All votes will be tabulated by the inspector of election  appointed for the
meeting,   who  will  separately   tabulate   affirmative  and  negative  votes,
abstentions and broker  non-votes.  Abstentions and broker non-votes are counted
towards a quorum but are not counted for any  purpose in  determining  whether a
matter is approved.

Voting of Proxies

     The Castelle proxy  accompanying  this Prospectus is solicited on behalf of
the Board of Directors of Castelle for use at the Castelle Meeting. Shareholders
are  requested to complete,  date and sign the  accompanying  proxy and promptly
return it in the  accompanying  envelope or otherwise  mail it to Castelle.  All
proxies that are properly executed and returned,  and that are not revoked, will
be voted at the Castelle Meeting in accordance with the  instructions  indicated
on the proxies or, if no direction is indicated, to approve the Merger Agreement
and the  election of the  nominees  indicated  on the proxy card to the Board of
Directors  and the  ratification  of  Coopers &  Lybrand  L.L.P.  as  Castelle's
auditors.  Castelle's  Board of Directors does not presently intend to bring any
business before the Castelle Meeting other than the specific  proposals referred
to in this  Prospectus and specified in the notice of the Castelle  Meeting.  So
far as is known to  Castelle's  Board of  Directors,  no other matters are to be
brought before the Castelle  Meeting.  As to any business that may properly come
before the Castelle Meeting,  however,  it is intended that proxies, in the form
enclosed,  will be voted in respect  thereof in accordance  with the judgment of
the persons voting such proxies.  A Castelle  shareholder  who has given a proxy
may revoke it at any time before it is exercised at the Castelle Meeting, by (i)
delivering  to the Secretary of Castelle (by any means,  including  facsimile) a
written  notice,  bearing a date later than the date of the proxy,  stating that
the proxy is revoked,  (ii) signing and so  delivering  a proxy  relating to the
same shares and bearing a later date prior to the vote at the Castelle  Meeting,

                                       32
<PAGE>

or  (iii)  attending  the  Castelle  Meeting  and  voting  in  person  (although
attendance at the Castelle Meeting will not, by itself, revoke a proxy).

Vote Required

     Approval of the Merger  Agreement  will require the  affirmative  vote of a
majority of the outstanding shares of Castelle Common Stock.  Directors shall be
elected by a plurality of the votes  present in person or  represented  by proxy
and entitled to vote.  Ratification of the selection of Coopers & Lybrand L.L.P.
as  Castelle's  auditors  for the fiscal  year  ending  December  31, 1996 shall
require the affirmative vote of the holders of a majority of the total shares of
Castelle  Common Stock present in person or represented by proxy and entitled to
vote  therein.  See "The Merger  Agreement and Related  Transactions  -- Related
Agreements" and "Additional Matters for Consideration of Castelle Shareholders."

Quorum; Abstentions; Broker Non-Votes

     The required quorum for the transaction of business at the Castelle Meeting
is a majority  of the shares of Common  Stock  outstanding  on the Record  Date.
Abstentions and broker non-votes each will be included in determining  whether a
quorum is present.  Abstentions  will be counted towards the tabulation of votes
cast.  Abstentions  will have the same effect as a vote  against the proposal to
approve the Merger but will have no effect on the election of directors.  Broker
non-votes  will not be  counted  for any  purpose  in  determining  whether  the
proposal to approve the Merger has been approved or to elect directors.

Solicitation of Proxies and Expenses

     Castelle  will  bear  the  entire  cost  of the  solicitation  of  proxies,
including preparation,  assembly,  printing and mailing of this proxy statement,
the proxy and any additional  information furnished to its shareholders.  Copies
of the  solicitation  materials  will be furnished to banks,  brokerage  houses,
fiduciaries  and custodians  holding in their names shares of Castelle's  Common
Stock  beneficially  owned by  others  to  forward  to such  beneficial  owners.
Castelle may reimburse  persons  representing  beneficial owners of Common Stock
for their costs of forwarding  solicitation materials to such beneficial owners.
Original  solicitation  of proxies  by mail may be  supplemented  by  telephone,
telegram,  letter or personal  solicitation  by  directors,  officers,  or other
regular  employees  of  Castelle.  No  additional  compensation  will be paid to
directors, officers and other regular employees for such services.

Board Recommendations

     THE BOARD OF DIRECTORS OF CASTELLE  BELIEVES THAT THE MERGER IS FAIR TO AND
IN THE BEST INTERESTS OF CASTELLE AND ITS SHAREHOLDERS AND THEREFORE UNANIMOUSLY
RECOMMENDS  A  VOTE  FOR  APPROVAL  OF  THE  MERGER  AGREEMENT  AND  UNANIMOUSLY
RECOMMENDS A VOTE IN FAVOR OF EACH NAMED NOMINEE TO THE BOARD OF DIRECTORS AND A
VOTE IN FAVOR OF THE  RATIFICATION  OF COOPERS & LYBRAND  L.L.P.  AS  CASTELLE'S
AUDITORS.

                                       33

<PAGE>



                                THE IBEX MEETING

Date, Time and Place

     The  Special  Meeting  of  Shareholders  of Ibex  will  be held on  Monday,
November 18, 1996,  at 10:00 a.m.,  local time,  at Ibex's  offices at 4921 R.J.
Mathews Parkway, El Dorado Hills, California.

Solicitation of Proxies

     The enclosed proxy is solicited on behalf of the Board of Directors of Ibex
for use at the Ibex  Meeting,  or at any  adjournment  thereof.  Any proxy given
pursuant to this solicitation may be revoked by the person giving it at any time
before its use by delivering to the corporate Secretary of Ibex a written notice
of revocation or a duly executed  proxy bearing a later date or by attending the
Ibex Meeting and voting in person.

Record Date and Outstanding Shares

     Only  shareholders  of record at the close of  business  on the Ibex Record
Date are entitled to vote at the Ibex  Meeting.  At the close of business on the
Ibex Record  Date,  there were  138,016  shares of Ibex Common  Stock and 48,035
shares  of  Ibex  Preferred  Stock   outstanding  and  entitled  to  vote.  Ibex
shareholders  are  entitled  to one vote for each share of Common  Stock and one
vote for each share of Ibex Preferred Stock held on the Record Date.

Vote Required

     Approval of the Merger  Agreement by Ibex  shareholders  is required by the
California General Corporation Law and the Ibex Articles. Such approval requires
the  affirmative  vote of the  holders of (i) a  majority  of the shares of Ibex
Common Stock  outstanding on the Ibex Record Date,  voting as a separate  class;
and (ii) a majority of the shares of Ibex  Preferred  Stock  outstanding  on the
Ibex  Record  Date,  voting as a separate  class.  Certain  executive  officers,
directors and shareholders of Ibex, who beneficially own on the Ibex Record Date
(i) 97,000 shares of Ibex Common Stock (constituting  approximately 70.3% of the
shares of Ibex Common Stock then  outstanding);  and (ii) 48,035  shares of Ibex
Preferred Stock (constituting  100.0% of the shares of Ibex Preferred Stock then
outstanding)  have entered into  agreements  obligating them to vote in favor of
the Merger Agreement and have executed proxies  appointing  officers of Castelle
as their  attorneys  and  proxies  with full power to vote their  shares of Ibex
Capital  Stock.  Approval  of the  1992  Stock  Option  Plan  will  require  the
affirmative  vote of a majority of the  outstanding  shares of Ibex Common Stock
and Ibex Preferred Stock, voting together as a single class. See "The Merger and
Related  Transactions -- Related Agreements." As of the Ibex Record Date and the
date of this Prospectus, Castelle owns no shares of Ibex stock.

Quorum; Abstentions

     The required  quorum for the transaction of business at the Ibex Meeting is
a majority  of the shares of Ibex  Common  Stock and a majority of the shares of
Ibex Preferred Stock outstanding on the Record Date. Abstentions will be counted
for  purposes  of  determining  the  presence of a quorum.  Abstentions  will be
counted towards the tabulation of the votes cast. Abstentions will have the same
effect as a vote against the Merger Agreement and the 1992 Stock Option Plan.

                                       34

<PAGE>



Voting of Proxies

     The Ibex proxy  accompanying  this Prospectus is solicited on behalf of the
Board  of  Directors  of Ibex  for use at the  Ibex  Meeting.  Shareholders  are
requested to complete,  date and sign the accompanying proxy and promptly return
it in the  accompanying  envelope or otherwise mail it to Ibex. All proxies that
are properly executed and returned,  and that are not revoked,  will be voted at
the Ibex Meeting in accordance  with the  instructions  indicated on the proxies
or, if no direction is indicated,  to approve the Merger  Agreement and the 1992
Option Plan.  Ibex's Board of Directors  does not presently  intend to bring any
business before the Ibex Meeting other than the specific  proposals  referred to
in this Prospectus and specified in the notice of the Ibex Meeting. So far as is
known to Ibex's Board of Directors,  no other  matters are to be brought  before
the Ibex  Meeting.  As to any business  that may  properly  come before the Ibex
Meeting,  however,  it is intended that proxies,  in the form enclosed,  will be
voted in respect  thereof in accordance  with the judgment of the persons voting
such  proxies.  An Ibex  shareholder  who has given a proxy may revoke it at any
time  before it is  exercised  at the Ibex  Meeting,  by (i)  delivering  to the
Secretary of Ibex (by any means,  including facsimile) a written notice, bearing
a date later than the date of the proxy, stating that the proxy is revoked, (ii)
signing  and so  delivering  a proxy  relating  to the same shares and bearing a
later date prior to the vote at the Ibex  Meeting,  or (iii)  attending the Ibex
Meeting and voting in person (although  attendance at the Ibex Meeting will not,
by itself, revoke a proxy).

Solicitation of Proxies and Expenses

     Ibex will bear the cost of  solicitation  of proxies in the  enclosed  form
from its  shareholders.  In addition to  solicitation  by mail,  the  directors,
officers  and  employees  of Ibex  may  solicit  proxies  from  shareholders  by
telephone, telegram, telecopy, letter or in person.

Board Recommendations

     THE BOARD OF DIRECTORS OF IBEX  BELIEVES  THAT THE MERGER IS FAIR TO AND IN
THE  BEST  INTERESTS  OF IBEX AND ITS  SHAREHOLDERS  AND  THEREFORE  UNANIMOUSLY
RECOMMENDS  A  VOTE  FOR  APPROVAL  OF  THE  MERGER  AGREEMENT  AND  UNANIMOUSLY
RECOMMENDS A VOTE FOR APPROVAL OF THE 1992 STOCK OPTION PLAN.

                     SHAREHOLDERS SHOULD NOT SEND ANY STOCK
                      CERTIFICATES WITH THEIR PROXY CARDS


                                       35

<PAGE>



                       THE MERGER AND RELATED TRANSACTIONS

     The  description  of the  Merger  and the  principal  terms  of the  Merger
Agreement in this Joint Proxy  Statement/Prospectus  is subject to and qualified
in its  entirety  by  reference  to the  Merger  Agreement,  a copy of  which is
attached as Appendix A and incorporated herein by reference.

General

     The Merger will be consummated promptly after Castelle shareholder and Ibex
shareholder  approval and the  satisfaction or waiver of the other conditions to
consummation of the Merger.  Upon  consummation  of the Merger,  Ibex will merge
into and become a division of  Castelle.  The  shareholders  of Ibex will become
shareholders of Castelle (as described below), and their rights will be governed
by Castelle's Articles of Incorporation, as amended, and Bylaws.

         Conversion of Shares

     Ibex Shares.  At the effective time of the Merger,  the Merger Shares shall
be  available  for issuance to holders of Ibex  Preferred  Stock and Ibex Common
Stock and upon  exercise of Ibex  Options.  In the event the closing  price of a
share of Castelle  Common Stock on the business day  immediately  preceding  the
effective  time of the Merger is $9.42 or  greater,  each  share of Ibex  Common
Stock and each share of Ibex Preferred Stock  outstanding  immediately  prior to
the  effective  time of the Merger shall be converted  into the right to receive
4.17731  shares of Castelle  Common  Stock.  In the event the closing price of a
share of Castelle  Common Stock on the business day  immediately  preceding  the
effective  time of the Merger is less than $9.42,  each share of Ibex  Preferred
Stock  outstanding  immediately  prior to the effective time of the Merger shall
receive a pro rata  allocation  of shares of Castelle  Common  Stock with a fair
market value on the business day immediately preceding the effective time of the
Merger equal to the Preferred Stock Preference.  Holders of Ibex Preferred Stock
and Ibex Common Stock shall share in a pro rata distribution, based on the total
number of shares held, of the Merger Shares  remaining  after  allocation of the
Preferred Stock Preference.

     If any shares of Ibex Common  Stock  outstanding  immediately  prior to the
consummation  of the Merger are unvested or are subject to a repurchase  option,
risk of forfeiture or other  condition  under any  applicable  restricted  stock
purchase  agreement or other  agreement  with Ibex,  then the shares of Castelle
Common  Stock  issued in exchange for such shares of Ibex Common Stock will also
be unvested and subject to the same  repurchase  option,  risk of  forfeiture or
other  condition,  and the  certificates  representing  such  shares of Castelle
Common Stock may accordingly be marked with appropriate legends.

     As of the date of this  Prospectus,  the Articles of  Incorporation of Ibex
entitle the holders of Ibex  Preferred  Stock to receive $6.25 per share of Ibex
Preferred  Stock prior to any other  allocations to  shareholders in a merger if
the  total  consideration  paid to  acquire  Ibex is less than $8  million.  The
holders of Ibex  Preferred  Stock have agreed to convert  19,235  (approximately
40%) of the  outstanding  shares of Ibex Preferred  Stock into Ibex Common Stock
immediately  prior to the consummation of the Merger. At the time of the Merger,
therefore,  assuming the Castelle  Common  Stock issued in  connection  with the
Merger has a fair  market  value of less than $8  million,  there will be 28,800
shares of Ibex Preferred Stock  outstanding with an aggregate  preference due of
$180,000.


                                       36

<PAGE>



     Although  the number of shares of Castelle  Common  Stock to be received in
exchange for each share of Ibex Preferred  Stock and Ibex Common Stock cannot be
calculated  at this time because the exchange  ratios will be  determined by the
fair  market  value of a share of  Castelle  Common  Stock on the  business  day
preceding the effective time of the Merger, for illustrative  purposes only, the
shares of Castelle  Common Stock to be received in exchange  for Ibex  Preferred
Stock  and  Ibex  Common  Stock  would  be as  follows  as of the  date  of this
Prospectus at the Designated Castelle Stock Prices shown below:

                                          Shares of Castelle Common Stock
                                            Received for each Share of:
                                     ----------------------------------------
     Designated Castelle             Ibex Preferred               Ibex Common
         Stock Price                     Stock                       Stock
     -------------------             --------------               -----------
            $6.00                       5.07155                     4.02988
            $7.00                       4.94378                     4.05094
            $8.00                       4.84798                     4.06673
      $9.42 or greater                  4.17731                     4.17731

     Utilizing  a closing  price  for a share of  Castelle  Common  Stock on the
business day immediately prior to the Merger of $6.00 as the Designated Castelle
Stock  Price,  approximately  146,061  shares of Castelle  Common Stock would be
issued in the Merger to holders of Ibex Preferred Stock,  approximately  645,792
shares of Castelle  Common Stock would be issued to holders of Ibex Common Stock
in the Merger, and approximately 58,147 shares of Castelle Common Stock would be
reserved for issuance upon the exercise of Ibex Options.


     Utilizing  a closing  price  for a share of  Castelle  Common  Stock on the
business day immediately prior to the Merger of $7.00 as the Designated Castelle
Stock  Price,  approximately  142,381  shares of Castelle  Common Stock would be
issued in the Merger to holders of Ibex Preferred Stock,  approximately  649,168
shares of Castelle  Common Stock would be issued to holders of Ibex Common Stock
in the Merger, and approximately 58,451 shares of Castelle Common Stock would be
reserved for issuance upon the exercise of Ibex Options.

     Utilizing  a closing  price  for a share of  Castelle  Common  Stock on the
business day immediately prior to the Merger of $8.00 as the Designated Castelle
Stock  Price,  approximately  139,622  shares of Castelle  Common Stock would be
issued in the Merger to holders of Ibex Preferred Stock,  approximately  651,699
shares of Castelle  Common Stock would be issued to holders of Ibex Common Stock
in the Merger, and approximately 58,679 shares of Castelle Common Stock would be
reserved for issuance upon the exercise of Ibex Options.

     Utilizing  a closing  price  for a share of  Castelle  Common  Stock on the
business  day  immediately  prior to the Merger of $9.42 or  greater  results in
approximately 120,307 shares of Castelle Common Stock being issued in the Merger
to holders of Ibex  Preferred  Stock,  approximately  669,419 shares of Castelle
Common  Stock  being  issued to holders of Ibex  Common  Stock in the Merger and
approximately 60,274 shares of Castelle Common Stock being reserved for issuance
upon the exercise of assumed Ibex Options.  The foregoing numbers are subject to
change based upon the  granting,  exercise,  termination  or  expiration of Ibex
Options at or prior to the Merger Date.

     A recent price for Castelle Common Stock is shown on the cover page of this
Prospectus.  Holders of Ibex Common Stock may obtain the daily closing prices of
Castelle  Common Stock from The Wall Street  Journal or by calling Ibex at (916)
939-8888.

     Of the total shares of Castelle Common Stock issued in the Merger, 10% will
be retained  for a period of time in escrow as security to Castelle  against any
breach of  representations,  warranties or covenants by Ibex and the  Designated
Shareholders  (as defined  below).  Such shares shall be contributed  out of the
shares to be received as a result of the Merger by the Designated  Shareholders.
The Designated  Shareholders are Ney Grant, Betsy Gray-Grant,  Clovis Mattos and
Curtis  Powell.  Any shares not  required to satisfy  such  obligations  will be

                                       37
<PAGE>

released from escrow to the  Designated  Shareholders  after  termination of the
escrow period. See "The Merger and Related Transactions -- Escrow."

     No fractional shares of Castelle Common Stock will be issued in the Merger.
Instead,  each Ibex  shareholder  who would  otherwise  be entitled to receive a
fraction  of a share of  Castelle  Common  Stock will  receive an amount of cash
equal to $8.00 multiplied by the fraction of a share of Castelle Common Stock to
which the shareholder  would otherwise be entitled.  Castelle intends to use its
current cash resources to fund the payments for fractional shares.

     Ibex Options.  Upon consummation of the Merger,  each then outstanding Ibex
Option will  automatically  be converted  into an option to purchase a number of
shares of Castelle  Common Stock  determined by multiplying the number of shares
of Ibex Common Stock subject to the Ibex Option by the conversion  rate utilized
to convert  Ibex  Common  Stock into  Castelle  Common  Stock on the date of the
Merger,  at an exercise  price per share of Castelle  Common  Stock equal to the
exercise price per share of the Ibex Option at the time of the Merger divided by
the conversion  rate utilized to convert Ibex Common Stock into Castelle  Common
Stock  on the date of the  Merger,  rounded  up to the  nearest  cent.  To avoid
fractional  shares,  the number of shares of Castelle  Common Stock subject to a
converted  Ibex Option will be rounded down to the nearest whole share,  with no
cash being  payable  for such  fractional  share.  The other  terms of each Ibex
Option,  including status as a  "non-statutory  stock option" for federal income
tax purposes and vesting schedule, will remain unchanged.

     As of the Ibex Record Date, 14,429 shares of Ibex Common Stock were subject
to outstanding  Ibex Options.  Assuming a fair market value for Castelle  Common
Stock on the business day  immediately  preceding  the Merger of $6.00 per share
and that the same  number of shares are  subject  to Ibex  Options at the Merger
Date as were  outstanding  as of the Ibex  Record  Date,  such  options  will be
converted into options to purchase an aggregate of  approximately  58,147 shares
of Castelle Common Stock.  Should the fair market value of Castelle Common Stock
on the business day immediately  preceding the Merger be $7.00 per share and the
same  number of shares be  subject to Ibex  Options  at the Merger  Date as were
outstanding  as of the Ibex Record Date,  such  options  will be converted  into
options to purchase an  aggregate  of  approximately  58,451  shares of Castelle
Common  Stock.  Should the fair  market  value of Castelle  Common  Stock on the
business day  immediately  preceding  the Merger be $8.00 per share and the same
number  of  shares  be  subject  to  Ibex  Options  at the  Merger  Date as were
outstanding  as of the Ibex Record Date,  such  options  will be converted  into
options to purchase an  aggregate  of  approximately  58,679  shares of Castelle
Common  Stock.  Should the fair market  value for  Castelle  Common Stock on the
business day immediately  preceding the Merger be $9.42 per share or greater and
the same number of shares be subject to Ibex  Options at the Merger Date as were
outstanding  as of the Ibex Record Date,  such  options  will be converted  into
options to purchase an  aggregate  of  approximately  60,274  shares of Castelle
Common Stock.

     Surrender of Certificates.  If the Merger becomes effective,  Castelle will
mail a letter of transmittal with  instructions to all holders of record of Ibex
Capital  Stock as of the  effective  time of the Merger for use in  surrendering
their stock  certificates  in exchange for  certificates  representing  Castelle
Common  Stock and a cash  payment  in lieu of  fractional  shares.  Certificates
representing  shares of Ibex Capital Stock should not be  surrendered  until the
letter of transmittal is received.

Background of the Merger

     On May 23, 1996,  Ney Grant,  President of Ibex,  received  from a publicly
traded  communications  company an solicited offer to acquire Ibex. At the time,
Ibex was considering  potential financing and strategic  alternatives.  Although
Ibex had negotiated terms for a $1.5 million investment from a venture investor,
the Ibex  Board of  Directors  decided  to  pursue  discussions  with  potential
acquirors based on the relative valuations and strategic advantages.  On June 3,
1996, Ney Grant contacted Jerry Burke, Executive Vice President of Castelle, and

                                       38
<PAGE>

explained that Ibex was in  acquisition  discussions  with another  company (the
"Other Company").  Given the discussions  between Ibex and Castelle in the past,
Ney Grant believed that Castelle may have an interest in merging with Ibex.

     On June 12, 1996,  Arthur  Bruno,  Chairman of the Board of  Directors  and
Chief Executive Officer of Castelle,  and Jerome Burke, Executive Vice President
of Castelle,  met with Ney Grant,  President of Ibex, to explore the possibility
of a business  combination  between  Castelle and Ibex.  To assist in Castelle's
evaluation  of a possible  transaction  with Ibex,  Castelle  engaged  Unterberg
Harris to act as its financial advisor. A representative of Unterberg Harris met
with  Ney  Grant  on  June  14 to  discuss  the  possibility  of a  transaction.
Subsequent  to these  meetings,  Castelle and Ibex  decided to exchange  further
information to further  explore the possibility of a transaction and a series of
discussions and meetings between representatives of Castelle and Ibex occurred.

     On June 21, 1996, Ney Grant and Curt Powell visited Castelle and received a
non-binding  term sheet  describing an acquisition  offer from Jerry Burke and a
representative  of  Unterberg  Harris.  Later the same  day,  Ney Grant and Curt
Powell  visited the  representatives  for the Other  Company and received a term
sheet describing an acquisition offer from the Other Company.

     On June 25, 1996,  Castelle  submitted to Ibex a revised  non-binding  term
sheet which  outlined  the general  terms  under which  Castelle  was willing to
negotiate a deal. Ibex management approved these general parameters,  subject to
approval by its Board of Directors, and notified the Other Company with which it
had been  negotiating that it was rejecting its offer.  Ibex  management,  after
careful  consideration,  elected  to merge  with  Castelle  instead of the other
alternatives  for  the  following   reasons:   (i)  Castelle  has  an  excellent
distribution  channel for high  volume  product  sales which would be  extremely
difficult and expensive to develop; neither the Other Company nor the investment
would  provide easy access to this depth of channel  development;  (ii) Castelle
was located  relatively  nearby  compared with the Other  Company,  allowing the
companies to merge more easily; (iii) Ibex management felt that Castelle's stock
price was  undervalued  and that Ibex could  significantly  contribute to adding
value to the stock price;  (iv) Castelle  management took immediate  interest in
the new fax/email/Web  product,  and convinced Ibex management that Castelle and
Ibex could  adequately  launch and market such a product.  The Other Company was
also  interested  in the new product,  but it was unclear  whether it would be a
major part of the company's strategy and vision.

     On June 28, 1996,  representatives  of Castelle and Ibex met to discuss the
proposed terms of the transaction and suggested timetable for proceeding.  Based
on this  timetable,  a number  of  meetings  and  discussions  was held  between
representatives of Castelle and Ibex during late June and early July.

     On July 16,  1996, a regularly  scheduled  meeting of  Castelle's  Board of
Directors was held. In this  meeting,  Ney Grant was  introduced to the Board of
Directors  and made a  presentation  to them  regarding  Ibex.  Included  in the
presentation  was a history of Ibex,  an  overview  of Ibex's  management  team,
Ibex's current product offering and how the technology works, new products under
development and Ibex's business strategy for the future.  The Board of Directors
then asked specific  questions of Ney Grant  regarding  Ibex. Ney Grant left the
meeting and the Board of Directors discussed the proposed Merger.

     After several telephone  conversations  with Ibex board members in July and
August in which Ney Grant and Ibex counsel  presented details of the transaction
and full  discussion  of the  transaction  resulted,  a written  consent  to the
transaction was executed by the Ibex Board of Directors on August 12, 1996.

                                       39

<PAGE>



     On August 15, 1996,  Castelle held a special Board of Directors  meeting to
review the specific terms of the proposed Merger. In this meeting,  a summary of
the  transaction  was  presented by  Castelle's  counsel,  Castelle's  financial
advisor presented an analysis of the financial terms of the proposed transaction
and Arthur Bruno presented the Board of Directors with an assessment of the Ibex
technology.  After full discussion,  the Board of Directors unanimously approved
the Merger  Agreement as presented and determined that the Merger is in the best
interest of Castelle and its shareholders.

Reasons for the Merger

     Castelle's Reasons for the Merger

     The  Castelle  Board of  Directors  has  unanimously  approved  the  Merger
Agreement.  The Board  believes that the terms of the Merger  Agreement are fair
to, and in the best interests of, Castelle and its shareholders, and unanimously
recommends  that  shareholders  of  Castelle  vote FOR  approval  of the  Merger
Agreement.

     The Castelle Board of Directors based its approval of the Merger  Agreement
and its  determination  that the Merger  Agreement  is in the best  interests of
Castelle and its shareholders upon a number of factors,  including the following
advantages of the merger:

     o    Accelerates Castelle Entry into Internet-Based  Information  Delivery:
          Ibex has products under development which will leverage Castelle's fax
          expertise and position the combined company as the premier provider of
          "information-on-demand" solutions.

     o    Broadens  Castelle's  Product  Line:  Ibex is the leading  provider of
          fax-on-demand  software, a market segment  complementary to Castelle's
          fax server product line.  Ibex's  fax-on-demand  product  broadens the
          range of products  Castelle is able to offer  customers and offers the
          potential for Castelle to attain higher gross margins.

     o    Increases   Castelle's   Technology  Base:  Ibex  possesses  technical
          competency  in a numbers  of key areas  including  document  delivery,
          document  management and fax processing.  Castelle  believes that this
          technical  competence  can be leveraged to  significantly  enhance the
          functionality of Castelle's fax server product line.

     o    Technical and Management  Personnel:  Ibex has substantial  managerial
          and  development  personnel  and  resources  which  offer  significant
          benefit to Castelle.

     o    Complementary Distribution: Ibex's network of value-added resellers is
          a good complement to Castelle's  current channel of distributors  such
          as Tech Data, Ingram Micro and Merisel.

     In the course of its  deliberations,  the Board of  Directors  of  Castelle
reviewed with  Castelle's  management a number of other factors  relevant to the
Merger. In particular,  the Castelle Board considered,  among other things:  (i)
information concerning Castelle's and Ibex's respective  businesses,  prospects,
financial performances, financial conditions, operations and product development
schedules;  (ii) the public stock  market price of Castelle  Common Stock in the
recent  past;  (iii)  multiples  paid in  other  selected  software  merger  and
acquisition  transactions;  (iv) an analysis of the respective  contributions to
revenues,  operating  profits and net profits of the combined  company;  (v) the
compatibility of the managements of Castelle and Ibex; (vi) Castelle's strategic
objectives for  participation in the enterprise  client-server  software market;

                                       40
<PAGE>

(vii) a financial  presentation  by Unterberg  Harris,  including the opinion of
Unterberg Harris to the effect that the  consideration to be paid is fair from a
financial point of view to Castelle (as of the date of such  presentation);  and
(viii)  reports from  management and legal advisors on the results of Castelle's
due diligence investigation of Ibex.

     The Board of Directors of Castelle also considered a variety of potentially
negative factors in its deliberations concerning the Merger,  including: (i) the
possible  dilutive  effect of the issuance of Castelle  stock in the Merger (see
"Risk Factors -- Integration of Operations; Possible Adverse Effect on Financial
Results");  (ii) the risk that the public market price of Castelle's stock might
be  adversely  affected by  announcement  of the  Merger;  and (iii) the charges
expected to be incurred in connection with the Merger,  primarily in the quarter
in which the Merger is completed,  including the transaction  costs and costs of
integrating  the  businesses  of  the  companies  to be  reflected  in a  charge
estimated to be between $850,000 and $950,000 (see "Pro Forma Combined Condensed
Financial Information"); (vi) the risk that, despite the efforts of the combined
company, the services of key persons might not be retained;  (vii) the risk that
other  benefits  sought to be obtained by the Merger might not be obtained;  and
(viii) other risks described above under "Risk Factors."

     In view of the  wide  variety  of  factors,  both  positive  and  negative,
considered  by the  Castelle  Board  of  Directors,  the  Board  did not find it
practical to, and did not,  quantify or otherwise assign relative weights to the
specific factors considered.  After taking into consideration all of the factors
set forth above,  the Board of Directors of Castelle  determined that the Merger
was in the best  interests of Castelle and its  shareholders  and that  Castelle
should proceed with the Merger at this time.

     Ibex's Reasons for the Merger

     The Board of Directors  of Ibex  believes  that the  proposed  Merger would
afford Ibex the following  additional  advantages  and a greater  opportunity to
accomplish its strategic objectives:

     o    Improved Sales Performance. As a result of the financial strengths and
          stability of the combined  company,  the Board of Ibex  believes  that
          Ibex will be better  positioned to be viewed as a  financially  stable
          provider  of  mission-critical   application  solutions  to  corporate
          customers.

     o    Access  to  Castelle   Distribution   Channels.   Castelle's   broader
          distribution   channels  will  facilitate   greater  sales  of  Ibex's
          products.

     o    Desktop  Capability.  Castelle's  desktop products and technology will
          complement Ibex's current enterprise solutions and improve its ability
          to provide a comprehensive solution to its customers.

     o    Access to Capital.  Castelle's  current resources and access to public
          markets  will  allow  Ibex  increased  operating  flexibility  and the
          opportunity to pursue development activities.

     o    Complementary  Operations.  The  businesses  of Castelle  and Ibex are
          complementary  on all levels --  strategic,  operating,  technical and
          marketing  minimizing the need for the time consuming and  potentially
          disruptive integration of operations.


                                       41

<PAGE>



     o    Employee Recruitment and Retention.  In addition to greater stability,
          a publicly  traded  company has greater  ability to provide  financial
          incentives in order to recruit and retain employees.

     o    Shareholder Liquidity.  The Merger will provide Ibex shareholders with
          the ability to convert a currently  illiquid  investment into a liquid
          one with the  opportunity  to  realize  a future  return  based on the
          potential appreciation of Castelle's Common Stock after the Merger.

     The Board of  Directors  believes  that it is in the best  interests of the
Ibex  shareholders  to obtain  marketable  securities that may be either held or
sold as determined by each individual shareholder.  In this regard, the Board of
Directors  considered  the  feasibility  and prospects of  alternative  means to
provide  liquidity for Ibex  shareholders,  including other  potential  business
combinations and an initial public offering of Ibex Common Stock (an "IPO"). The
Board of Directors  considered  whether any other potential acquiror might offer
the same or similar  benefits to Ibex, and concluded  that Castelle  offered the
best  benefits  available.  Prior to agreeing to the Merger,  Ibex's  management
conducted informal  discussions with investment  bankers,  who indicated that an
IPO would not be feasible in the near term.  After  careful  consideration,  the
Board of Directors concurred with this assessment.

     In evaluating the proposed Merger,  the Ibex Board of Directors  considered
and  discussed a wide  variety of factors,  including  the details of the Merger
Agreement,  a description of Castelle's business and the recent trading activity
of its stock. The Board of Directors also discussed each component of the Merger
Agreement  in light of its  fairness to Ibex's  shareholders,  the impact of the
Merger  on  current  employees  of and  lenders  to Ibex,  the  availability  of
liquidity  to  Ibex's   shareholders,   and  the  requirements  for  a  tax-free
transaction which could be accounted for as a pooling of interests. In addition,
the Board of Directors  considered  the advantages  and  disadvantages  that the
Merger would present to Ibex's achievement of its strategic objectives.  As part
of the evaluation process, the Board of Directors reviewed information about the
business,  operations and future prospects of both Ibex and Castelle,  including
Castelle's  annual,  quarterly and other  reports,  registration  statements and
definitive  proxy  statements filed by Castelle with the Securities and Exchange
Commission, and Ibex's current business plan.

     The Ibex Board also considered the following  potentially negative factors:
(i) the potential  disruption of Ibex's business that might result from employee
uncertainty  and lack of focus  following  announcement of the Merger and during
the  combination  of the operations of Castelle and Ibex;  (ii) the  possibility
that  the  Merger  might  not be  consummated,  and the  effects  of the  public
announcement of the Merger on (A) Ibex's revenues and operating results, and (B)
Ibex's  ability to attract and retain key  management,  marketing  and technical
personnel;  (iii) the possible effects of the public  announcement of the Merger
on the market price of Castelle's Common Stock; (iv) the risk that,  despite the
intentions and the efforts of the parties to reassure Ibex's system  integrators
and VAR's  regarding  the combined  company's  intention to support their future
sales efforts,  the announcement of the Merger could result in decisions by such
partners to delay or cancel  purchases of Ibex  products;  (v) the risk that the
anticipated  benefits  of the Merger  will not be  realized;  and (vi) the other
risks described above under "Risk Factors."

     After considering the foregoing factors, the Board of Directors unanimously
approved  the  Merger  Agreement  and  the  transactions  contemplated  thereby,
including the Merger,  and recommended that the shareholders of Ibex approve and
adopt the Merger Agreement.  In view of the wide variety of factors  considered,

                                       42
<PAGE>

both  positive  and  negative,  Ibex's  Board  of  Directors  did  not  find  it
practicable to, and did not,  quantify or otherwise  assign relative  weights to
the specific factors considered.

     Board Recommendation

     THE BOARD OF DIRECTORS OF CASTELLE HAS DETERMINED THAT THE MERGER IS IN THE
BEST INTERESTS OF CASTELLE AND ITS SHAREHOLDERS AND HAS UNANIMOUSLY  RECOMMENDED
A VOTE FOR APPROVAL OF THE MERGER AGREEMENT.

     THE BOARD OF  DIRECTORS  OF IBEX HAS  DETERMINED  THAT THE MERGER IS IN THE
BEST INTERESTS OF IBEX AND ITS  SHAREHOLDERS  AND HAS UNANIMOUSLY  RECOMMENDED A
VOTE FOR APPROVAL OF THE MERGER AGREEMENT.

     Opinion of Financial Advisor to Castelle

     At a meeting of  Castelle's  Board of  Directors  held on August 15,  1996,
Unterberg Harris delivered its oral opinion that, based on the proposed terms of
the  Merger as of that date,  the  consideration  proposed  to be offered to the
shareholders  of Ibex in the Merger was fair to Castelle from a financial  point
of view.  In  connection  with the  delivery of its oral opinion to the Board of
Directors  of  Castelle  on August  15,  1996,  Unterberg  Harris  presented  to
Castelle's  Board of  Directors  a summary of the  material  financial  analyses
conducted by Unterberg  Harris in connection  with such oral opinion.  Unterberg
Harris was asked to render an opinion that the merger  consideration was fair to
Castelle from a financial point of view. Unterberg Harris's opinion is addressed
only  to  the  Board  of  Directors  of  Castelle  and  does  not  constitute  a
recommendation to any shareholder of Castelle as to how such shareholder  should
vote at the Castelle  Meeting.  No  limitations  were  imposed by Castelle  with
respect to the opinion rendered by Unterberg Harris.

     The full text of Unterberg Harris's written opinion, dated August 22, 1996,
which sets forth certain of the assumptions  made and the factors  considered by
Unterberg  Harris in rendering its opinion,  as well as the  limitations  on the
review  undertaken in connection  with such opinion,  is set forth as Annex B to
this  Proxy/Prospectus  and should be read in its  entirety.  The following is a
summary of the text of Unterberg  Harris's  opinion and,  accordingly,  the full
text of Unterberg Harris's written opinion should be read in its entirety.

     In arriving at its opinion,  Unterberg Harris reviewed certain  information
relating  to  Castelle  and Ibex  including:  the  Merger  Agreement;  financial
information with respect to the business  operations of Ibex including,  but not
limited to, audited  financial  statements of Ibex for the fiscal years December
31, 1995 and December 31, 1994 and unaudited financial  information for Ibex for
the  period  ended  June 30,  1996;  financial  information  with  regard to the
business  operations  of  Castelle,  including,  but  not  limited  to,  audited
financial  statements  of for the fiscal years  December 31, 1995,  December 31,
1994, and December 31, 1993 and unaudited financial  statements for Castelle for
the period  ended June 28, 1996;  a  comparison  of operating  results and other
financial statement  information of Castelle and Ibex with other companies which
Unterberg Harris deemed appropriate;  a comparison of the financial terms of the
Merger  with the terms of certain  other  transactions  which  Unterberg  Harris
deemed appropriate; and certain financial projections prepared by the respective
managements of Castelle and Ibex. In addition, Unterberg Harris held discussions
with certain  members of Castelle and Ibex senior  management  concerning  their
past and current  operations  and financial  condition  and business  prospects,
discussed  with Castelle  management  the results of their due diligence of Ibex
and participated in the discussions and negotiations  among  representatives  of
Castelle and Ibex and their legal advisors and independent  auditors.  Unterberg

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<PAGE>

Harris also reviewed other  information  and performed such other analysis as it
deemed appropriate.

     Unterberg  Harris  has  assumed  and  relied  upon,   without   independent
verification,  the accuracy and completeness of the information  reviewed by it.
With respect to any  financial  projections,  Unterberg  Harris has assumed that
they  have been  reasonably  prepared  on bases  reflecting  the best  currently
available   estimates  and  judgments  of  the   respective   future   financial
performances  of Castelle and Ibex and the future  financial  performance of the
Merged  Company.   Unterberg  Harris  has  also  assumed,   without  independent
verification,  that Ibex owns or has adequate legal  protection for all material
intellectual  property it purports to own, that Ibex owns or has adequate rights
to use all  intellectual  property  material  to its  business as  conducted  or
contemplated  to be conducted  and that the  representations  and  warranties of
Castelle and Ibex in the Merger Agreement are true and correct.

     Unterberg Harris has not conducted a physical  inspection of the properties
or facilities of Castelle or Ibex or made any independent valuation or appraisal
for the assets,  liabilities,  patents or  intellectual  property of Castelle or
Ibex,  nor has  Unterberg  Harris been  furnished  with any such  valuations  or
appraisals. Unterberg Harris has assumed that the assessments of management have
been made in good faith and  reflect  the best  currently  available  management
judgments as to the matters covered.  Unterberg Harris's opinion was necessarily
based on  economic,  market  and  other  conditions  as in  effect  on,  and the
information made available to it as of, the date of its opinion.

     The following  paragraphs provide a brief summary of the material financial
analyses conducted by Unterberg Harris in connection with its opinion. Except as
otherwise  noted,  analysis  of current  stock  prices of  Castelle,  comparable
companies and  transaction  values were based on trading  prices as of August 7,
1996.

     In considering  the financial  impact of the Merger on Castelle,  Unterberg
Harris  analyzed  the pro forma effect of the Merger on the  projected  combined
income of Castelle and Ibex for the fiscal year ending  December  31, 1997.  The
analysis was based on an assumed  issuance of 850,000 shares of Castelle  common
stock and on the financial  projections  and related  assumptions as provided by
the management of Castelle and Ibex. The analysis showed an increase in earnings
per share of the Merged  Company  relative to that of Castelle on a  stand-alone
basis for the fiscal year ending December 31, 1997,  before giving effect to any
potential revenue and operating synergies.

     Unterberg  Harris also analyzed the  contribution of revenue,  gross profit
and operating  income to the Merged Company from each of Castelle and Ibex. This
contribution analysis was then compared to the pro forma ownership percentage of
the  Castelle  shareholders  in the pro forma  Merged  Company.  The  comparison
indicated  that  Castelle's  pro  forma  ownership   percentage  was  more  than
Castelle's  relative  contribution to gross profit and operating income for both
the latest twelve months ending June 30, 1996 and for the projected  fiscal year
ending December 31, 1997.

     Unterberg Harris also compared selected  historical and projected operating
and stock market data and operating  and financial  ratios for Castelle and Ibex
to the corresponding  data and ratios of certain other publicly traded companies
as of August 7, 1996, which it deemed comparable to Castelle and Ibex. Such data
and ratios  included:  multiples of net market value (defined as market value of
equity plus long term debt less cash and equivalents) to last 12 months revenue,
to projected  calendar  year 1996 revenue and to  projected  calendar  year 1997
revenue;  and market  value to last twelve  months net  earnings,  to  projected
calendar year 1996 net earnings and to projected  calendar  year 1997  earnings.
For the  comparable  companies,  the  multiples of net market value to latest 12

                                       44
<PAGE>

months revenue ranged from 0.6x to 16.5x with a median of 2.5x. The multiples of
net market value to projected  calendar  1996 revenue  ranged from 0.6x to 13.0x
with a median of 1.8x.  The multiples of net market value to projected  calendar
1997 revenue  ranged from 0.5x to 9.4x with a median of 1.3x.  The  multiples of
market price to last twelve months net earnings  ranged from 12.6x to 67.6x with
a median of 19.9x. The multiples of market price to projected  calendar 1996 net
earnings  ranged from 12.6x to 50.4x with a median of 24.8x.  The  multiples  of
market price to projected  calendar 1997 net earnings  ranged from 9.8x to 39.0x
with a median of 15.5x.  Unterberg Harris determined that based on this analysis
of comparable  companies,  the multiples for Ibex, when calculated  based on the
merger  consideration,  were  within  or below the  range of  multiples  for the
selected comparable companies.

     Unterberg    Harris   also    analyzed    data   obtained   from   selected
technology-related  merger  and  acquisition  transactions  that  occurred  from
January 15, 1992 through July 22, 1996 or were  pending  during such period.  In
examining these transactions, Unterberg Harris analyzed certain income statement
and  balance  sheet  parameters  of  the  acquired  companies  relative  to  the
consideration paid. Multiples analyzed included equity value to latest 12 months
net income,  equity value to book value, and enterprise value (defined as equity
value plus debt less cash and  equivalents)  to latest 12 months  revenue and to
latest 12 months operating income. In certain cases, complete financial data was
not publicly available for these  transactions and only partial  information was
used in such instances. Unterberg Harris determined that, based on this analysis
of merger and  acquisition  transactions,  the multiples for Ibex,  based on the
merger consideration, were within the range of multiples for the selected merger
and acquisition transactions.

     The  summary  above does not  purport to be a complete  description  of the
analyses  performed by Unterberg Harris in connection with its fairness opinion.
The  preparation of a fairness  opinion  involves  various  subjective  business
determinations  as to the most  appropriate  and  relevant  methods of financial
analysis and the  application of those methods to the particular  circumstances,
and therefore such an opinion is not readily  susceptible to partial analysis or
summary   description.   Accordingly,   notwithstanding   the  separate  factors
summarized above, Unterberg Harris believes that its analyses must be considered
as a  whole  and  that  selecting  portions  of  its  analyses  and  considering
individual factors without  considering all analyses and factors could create an
incomplete and misleading view of the evaluation process underlying its opinion.
With  respect  to  comparable  companies  analyses  and  comparable  transaction
analyses, a particular analysis performed by Unterberg Harris is not necessarily
indicative of actual  values,  which may be  significantly  higher or lower than
suggested  by  such  analyses.  The  analyses  are  not  appraisals  and  do not
necessarily  reflect the prices for which  businesses  actually could be sold or
actual  values or future  results  that might be  achieved.  Unterberg  Harris's
analyses  were  prepared  solely  as part of  Unterberg  Harris's  review of the
fairness of the  consideration  to be paid by Castelle  in  connection  with the
Merger from a financial point of view and were provided to the Castelle Board of
Directors in  connection  with the delivery of Unterberg  Harris's  opinion.  In
addition,  Unterberg Harris's opinion and presentation to the Castelle Board was
only one of many  factors  taken into  consideration  by the  Castelle  Board in
making its determination to approve the Merger.

     Pursuant to the terms of the engagement by Castelle of Unterberg  Harris as
its  financial  advisor in  connection  with the Merger,  Unterberg  Harris will
receive a fee upon  consummation of the Merger.  In addition,  Unterberg  Harris
will be reimbursed for out-of-pocket expenses in connection with the engagement.
Unterberg  Harris has provided  investment  banking  services to Castelle in the
past,  including  acting as managing  underwriter  in Castelle's  initial public
offering in 1995.  Unterberg Harris has received customary  compensation for its
services.  Unterberg  Harris  is a  market  maker  for  Castelle  Common  Stock.
Unterberg Harris, as part of its investment banking business,  is engaged in the
valuation of businesses and their  securities in corporate  reorganizations  and

                                       45
<PAGE>

for other  purposes.  The Castelle  Board  selected  Unterberg  Harris to act as
financial advisor on the basis of Unterberg Harris's reputation as an investment
bank, Castelle's prior relationship with Unterberg Harris and Unterberg Harris's
familiarity with Castelle.

Related Agreements

     Affiliate Agreements

     To help  ensure  that the Merger  will be  accounted  for as a "pooling  of
interests,"  the  executive  officers and directors of Castelle and Ibex and 10%
shareholders  of Ibex will execute  agreements  that  prohibit such persons from
disposing  of their  shares  during the period  commencing  30 days prior to the
closing date of the Merger (the "Closing  Date") and ending when Castelle  first
publicly  releases its  quarterly  financial  statements  including the combined
financial  results  of Ibex  and  Castelle  for a  period  of at  least 30 days.
Pursuant to such  agreements,  Ibex affiliates will also  acknowledge the resale
restrictions  imposed by Rule 145 promulgated under the Securities Act on shares
received by them in the Merger. In addition,  certain  shareholders of Ibex will
also  sign  agreements   making  certain   representations   pertaining  to  the
"continuity  of  interest"  requirements  for  a  tax-free  reorganization.  See
"Certain Federal Income Tax Matters" below.

     Conversion Agreement

     As of the date of this  Prospectus,  the Articles of  Incorporation of Ibex
entitle the holders of Ibex  Preferred  Stock to receive $6.25 per share of Ibex
Preferred  Stock prior to any other  allocations to  shareholders in a merger if
the  total  consideration  paid to  acquire  Ibex is less than $8  million.  The
holders of Ibex  Preferred  Stock have agreed to convert  19,235  (approximately
40%) of the  outstanding  shares of Ibex Preferred  Stock into Ibex Common Stock
immediately  prior to the consummation of the Merger. At the time of the Merger,
therefore,  assuming the Castelle  Common  Stock issued in  connection  with the
Merger has a fair  market  value of less than $8  million,  there will be 28,800
shares of Ibex Preferred Stock  outstanding with an aggregate  preference due of
$180,000.

     Irrevocable Proxy Agreements

     Pursuant to irrevocable  proxy agreements  executed  concurrently  with the
execution of the Merger  Agreement,  directors,  executive  officers and certain
major shareholders of Ibex holding in the aggregate  approximately 100.0% of the
outstanding  shares of Ibex Preferred Stock and 70.3% of the outstanding  shares
of Ibex Common Stock have agreed to vote in favor of the Merger and have granted
Castelle  proxies to vote their shares of Ibex Common  Stock and Ibex  Preferred
Stock in favor of the Merger.

Benefits to Ibex Executives and Shareholders from Merger

     Ney Grant, Director,  President and Chief Executive Officer of Ibex, Curtis
Powell,  Director and Vice President of Ibex, and three other  employees of Ibex
have agreed to execute  employment  agreements  with Castelle in connection with
the Merger.  In addition,  Ney Grant,  Curtis Powell and one other employee have
agreed to execute noncompetition agreements with Castelle in connection with the
Merger.  The  employment  agreements  have terms of  between  one and two years,
include  annual  salaries  of between  $40,000 and  $125,000  and the payment of
commissions on sales where  appropriate,  and provide for the payment of stay-on
bonuses of between  $3,333 and $11,667 per month for periods  varying from 12 to
18 months.  Castelle may terminate the employees with or without cause,  however
Castelle  remains  obligated  to pay the salary and  stay-on  bonus  obligations

                                       46
<PAGE>

through  the term of the  applicable  contract  if the  employee  is  terminated
without cause.  Mr. Grant, Mr. Powell and one other employee have also agreed to
execute  Noncompetitive  Agreements with Castelle in connection with the Merger.
Under these  agreements  Castelle shall pay each signatory  amounts ranging from
$50,000 to $150,000 in three equal, monthly installments beginning with the date
on which the Merger is  effective.  In exchange,  Messrs.  Grant and Powell have
agreed to refrain  from  providing  services,  support,  products or  technology
related to the  business  of Ibex to any person for a period of two years  after
termination  of their  employment  with Castelle.  The  additional  employee has
agreed to such  restrictions  for a period of one year after  termination of his
employment with Castelle.

     In addition,  holders of Ibex Preferred  Stock have been granted the right,
effective  upon the Merger,  to register the Castelle  Common Stock  received in
connection  with the  Merger  for  resale  to the  public,  subject  to  certain
restrictions  and the  approval  of  such  rights  by the  existing  holders  of
registration  rights.  Upon the  approval  of existing  holders of  registration
rights,  holders of Ibex Common Stock shall  receive  more limited  registration
rights  which will be subject to certain  restrictions,  including  the right to
participate in the  registration of shares of Castelle stock initiated by either
Castelle  or  holders of  registration  rights  other  than the  holders of Ibex
Preferred Stock identified above.

Representations and Covenants

     Under  the  Merger   Agreement,   Castelle   and  Ibex  made  a  number  of
representations  regarding  their  respective  businesses,  capital  structures,
operations,  financial condition and other matters, including their authority to
enter into the Merger  Agreement and to consummate the Merger.  Ibex  covenanted
that,  until the  consummation  of the Merger or the  termination  of the Merger
Agreement,  it will maintain its business,  and it will not take certain actions
outside the ordinary course of business without Castelle's  consent.  Each party
covenants that until the  consummation  of the Merger or the  termination of the
Merger Agreement,  it will use its commercially reasonable efforts to consummate
the  Merger.  Each party has agreed not to  initiate  or solicit  any  proposals
relating to the possible  acquisition  of that party or any material  portion of
its capital stock or assets by any person other than  Castelle's  acquisition of
Ibex, and has further  agreed not to enter into any agreement  providing for any
such acquisition.

Escrow

     The Merger  Agreement  provides  that 10% of the shares of Castelle  Common
Stock  to be  issued  to Ibex  shareholders  will be  placed  in  escrow  by the
Designated  Shareholders  to  indemnify  Castelle  for damages  arising from the
following  circumstances:  (a) an inaccuracy in or breach of a representation or
warranty of Ibex or the Designated  Shareholders in the Merger  Agreement or any
related  agreement;  (b) a breach of a  covenant  or  obligation  of Ibex or the
Designated Shareholders;  or (c) any legal proceeding in connection with clauses
(a) and (b).  Representations  and  warranties  which are  reviewed in the audit
process shall terminate when Castelle publishes its audited financial statements
for the fiscal year which includes the Merger Date and the escrow will terminate
365 days after the Closing  Date.  The Escrow Agent is presently  expected to be
First Trust of  California,  National  Association.  Subject to the retention of
shares in the escrow to cover claims made during the escrow  period,  any shares
remaining in the escrow after the 365 day period will be distributed pro rata to
the Designated Shareholders. See "The Merger and Related Transactions -- Escrow"
and "-- Benefits to Ibex Executives and Shareholders from the Merger."


                                       47

<PAGE>



Conditions to the Merger

     In addition to the requirement  that approval by the Castelle  shareholders
and Ibex  shareholders  be  received,  the  obligations  of Castelle and Ibex to
consummate the Merger will be subject to the  satisfaction  of a number of other
conditions,  including the absence of any stop orders or  proceedings  seeking a
stop order with respect to the  Registration  Statement filed in connection with
this  Prospectus;  the  absence of any  order,  decree or ruling by any court or
governmental agency or threat thereof,  or any other fact or circumstance,  that
would prohibit or render  illegal the  transactions  contemplated  by the Merger
Agreement;  the  absence of the  issuance  by any  federal or state court of any
temporary  restraining  order,  any  preliminary or permanent  injunction or any
other order  preventing the  consummation of the Merger;  and the receipt of all
permits or authorizations that may be required by regulatory authorities.

     Each  party's   obligations   under  the  Merger  Agreement  will  also  be
conditioned upon the accuracy in every material  respect of the  representations
and warranties made by the other party; the performance in all material respects
by the other party of its  covenants;  the absence of a material  adverse change
with  respect to the other  party;  the receipt of approval of the Merger by the
shareholders  of  Castelle  and the  shareholders  of Ibex;  and the  receipt of
certain legal opinions  (including an opinion to the effect that the Merger will
be treated for federal income tax purposes as a tax-free reorganization).

     Castelle's   obligations   to   consummate   the  Merger  will  be  further
conditioned, among other things, upon (i) the receipt of a letter from Coopers &
Lybrand  L.L.P.  that the Merger will be treated as a pooling of  interests  for
accounting  purposes  and  (ii)  no  more  than  2% of  the  Ibex  Common  Stock
outstanding  at the time of the Merger  being  eligible to exercise  dissenters'
rights  of  appraisal  under   California  law.  See  "The  Merger  and  Related
Transactions -- Dissenters' Rights."

Termination and Termination Fees

     Termination

     The Merger  Agreement may be terminated by mutual agreement of both parties
or by either  party (i) as a result of a material  breach by the other  party of
any covenant or agreement set forth in the Merger Agreement;  (ii) if the timely
satisfaction  of any  of the  conditions  for  closing  the  Merger  has  become
impossible; (iii) if any of the closing conditions have not been satisfied prior
to the Closing;  or (iv) if the Closing has not taken place before  December 30,
1996.

     Termination Fees

     If, prior to the Closing or the termination of the Merger Agreement, either
Castelle or Ibex  enters into  negotiations  or  discussions  with a third party
concerning the sale of all or substantially all of the assets, business or stock
of that company,  such company shall immediately reimburse the other company for
all expenses and costs  incurred in  connection  with the Merger.  Should either
company enter into a letter of intent, understanding or other agreement relating
to the sale of all or substantially all of the assets, business or stock of that
company,  such company shall immediately pay the other company a termination fee
in the amount of $250,000.

                                       48

<PAGE>



Waivers and Amendments

     At any  time at or prior  to the  effective  time,  to the  extent  legally
allowed,  Castelle or Ibex,  without  approval of the  shareholders of each such
company, may waive compliance with any of the agreements or conditions contained
in the Merger  Agreement for the benefit of that company.  Neither  Castelle nor
Ibex  currently  intends  to  waive  compliance  with  any  such  agreements  or
conditions.

     The Merger Agreement may be amended by Castelle and Ibex at any time before
or after approval of the Castelle shareholders or the Ibex shareholders,  except
that,  after such  approval,  no amendment  may be made that by law requires the
further approval of the Castelle  shareholders or the Ibex  shareholders  unless
such approval is obtained.

Certain Federal Income Tax Matters

     The  following  discussion  summarizes  the  material  federal  income  tax
considerations  of the Merger that are  generally  applicable to holders of Ibex
Capital Stock. This discussion is based on currently existing  provisions of the
Code,  existing  and  proposed  Treasury  Regulations   thereunder  and  current
administrative rulings and court decisions,  all of which are subject to change.
Any such  change,  which  may or may not be  retroactive,  could  alter  the tax
consequences to Castelle, Ibex or Ibex's shareholders as described herein.

     Ibex  shareholders  should be aware that this discussion does not deal with
all federal income tax  considerations  that may be relevant to particular  Ibex
shareholders in light of their  particular  circumstances,  such as shareholders
who are dealers in securities,  who are subject to the  alternative  minimum tax
provisions of the Code, who are foreign persons, or who acquired their shares in
connection  with stock option or stock purchase  plans or in other  compensatory
transactions.  In addition,  the following  discussion  does not address the tax
consequences  of the Merger  under  foreign,  state or local tax laws or the tax
consequences  of  the  exercise  of  Ibex  Options  or  any  other  transactions
effectuated  prior to or after the Merger (whether or not such  transactions are
in connection with the Merger). Accordingly, IBEX OPTIONHOLDERS AND SHAREHOLDERS
ARE URGED TO CONSULT THEIR OWN TAX ADVISORS AS TO THE SPECIFIC  CONSEQUENCES  OF
THE MERGER,  INCLUDING  THE  APPLICABLE  FEDERAL,  STATE,  LOCAL AND FOREIGN TAX
CONSEQUENCES TO THEM OF THE MERGER IN THEIR PARTICULAR CIRCUMSTANCES.

     Neither  Castelle nor Ibex has requested a ruling from the Internal Revenue
Service (the "IRS") with regard to any of the federal income tax consequences of
the Merger. Graham & James LLP, counsel to Ibex, and Cooley Godward LLP, counsel
to Castelle,  have each rendered an opinion  (collectively,  the "Tax Opinions")
that the Merger will  constitute a  reorganization  under Section  368(a) of the
Code (a  "Reorganization").  Such opinions are based on certain  assumptions  as
well  as   representations   received  from  Castelle  and  Ibex  (including  an
assumption,  based on  representations,  concerning the "continuity of interest"
requirement discussed below) and are subject to the limitations discussed below.
Moreover, such opinions will not be binding on the IRS nor preclude the IRS from
adopting a contrary position.  The discussion below assumes that the Merger will
qualify as a Reorganization, based upon such opinions.

     Subject to the limitations and qualifications  referred to herein, and as a
result of the Merger's  qualifying as a  Reorganization,  the following  federal
income tax consequences should result:


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<PAGE>



     19.1 No gain or loss will be  recognized  by the  holders  of Ibex  Capital
          Stock upon the receipt of Castelle Common Stock solely in exchange for
          such Ibex  Capital  Stock in the Merger  (except to the extent of cash
          received in lieu of fractional shares).

     19.2 The  aggregate  tax basis of the Castelle  Common Stock so received by
          Ibex  shareholders  in the Merger  (including any fractional  share of
          Castelle  Common Stock not actually  received) will be the same as the
          aggregate tax basis of the Ibex Capital Stock  surrendered in exchange
          therefor.

     19.3 The holding  period of the  Castelle  Common Stock so received by each
          Ibex  shareholder  in the Merger will include the period for which the
          Ibex Capital Stock  surrendered in exchange therefor was considered to
          be held,  provided that the Ibex Capital Stock so  surrendered is held
          as a capital asset at the effective time of the Merger.

     19.4 Cash  payments  received by holders of Ibex Capital Stock in lieu of a
          fractional  share  will be  treated  as if such  fractional  share  of
          Castelle  Common Stock had been issued in the Merger and then redeemed
          by Castelle.  An Ibex  shareholder  receiving such cash will recognize
          gain or loss upon such payment,  measured by the  difference  (if any)
          between the amount of cash  received and the basis in such  fractional
          share.  The gain or loss should be capital gain or loss  provided that
          such share of Ibex  Capital  Stock was held as a capital  asset at the
          effective time of the Merger.

     19.5 A  shareholder  of Ibex who  exercises  dissenters'  rights  under any
          applicable  law with  respect  to a share of Ibex  Capital  Stock  and
          receives  payments for such stock in cash will recognize  capital gain
          or loss (if such  stock was held as a capital  asset at the  effective
          time of the Merger)  measured by the difference  between the amount of
          cash received and the shareholder's basis in such share, provided such
          payment is neither  essentially  equivalent  to a dividend  within the
          meaning  of  Section  302  of  the  Code  nor  has  the  effect  of  a
          distribution of a dividend within the meaning of Section  356(a)(2) of
          the Code (collectively,  a "Dividend Equivalent Transaction").  A sale
          of Ibex shares  incident to an  exercise  of  dissenters'  rights will
          generally not be a Dividend Equivalent  Transaction if, as a result of
          such exercise,  the dissenting  shareholder owns no shares of Castelle
          Common Stock (either actually or constructively  within the meaning of
          Section 318 of the Code).

     19.6 Neither  Castelle nor Ibex will  recognize  gain solely as a result of
          the Merger.

     The Tax Opinions are subject to certain  assumptions and qualifications and
are based on the truth and accuracy of certain representations of Castelle, Ibex
and  certain  shareholders  of  Ibex,   including   representations  in  certain
certificates  delivered to counsel by the respective managements of Castelle and
Ibex  and  certain  shareholders  of  Ibex.  Of  particular  importance  are the
assumptions  and  representations  relating  to  the  "continuity  of  interest"
requirement.

     To satisfy the "continuity of interest" requirement, Ibex shareholders must
not,  pursuant to a plan or intent existing at or prior to the effective time of
the  Merger,  dispose of or  transfer  so much of either (i) their Ibex  Capital
Stock in  anticipation  of the Merger or (ii) the  Castelle  Common  Stock to be
received in the Merger  (collectively,  "Planned  Dispositions"),  such that the
Ibex  shareholders,  as a  group,  would no  longer  have a  significant  equity
interest in the Ibex business being conducted by Castelle after the Merger. Ibex
shareholders will generally be regarded as having a significant  equity interest
as long as the Castelle  Common Stock  received in the Merger (after taking into

                                       50
<PAGE>

account  Planned  Dispositions),  in the  aggregate,  represents  a  substantial
portion of the entire  consideration  received by the Ibex  shareholders  in the
Merger.  No assurance can be made that the "continuity of interest"  requirement
will be satisfied,  and if such  requirement is not satisfied,  the Merger would
not be treated as a Reorganization.

     A successful IRS challenge to the Reorganization status of the Merger (as a
result of a failure of the  "continuity  of interest"  requirement or otherwise)
would  result  in  significant  tax  consequences.  An  Ibex  shareholder  would
recognize  gain  or loss  with  respect  to each  share  of Ibex  Capital  Stock
surrendered  equal to the  difference  between the  shareholder's  basis in such
share and the fair market value, as of the effective time of the Merger,  of the
Castelle  Common  Stock  received  in  exchange  therefor.   In  such  event,  a
shareholder's  aggregate  basis in the Castelle  Common Stock so received  would
equal its fair market value, and the shareholder's holding period for such stock
would begin the day after the Merger. In addition, the transfer of all of Ibex's
assets to  Castelle  would be  treated  as a taxable  sale of such  assets.  The
corporate level gain Ibex would recognize upon such a taxable sale of its assets
would be equal to the  difference  between  Ibex's  adjusted  tax  basis in such
assets and the fair market value of all of the merger consideration  transferred
by Castelle as of the effective time of the Merger plus the  liabilities of Ibex
assumed by Castelle as a result of the Merger.  Ibex's tax liability  associated
with such recognized gain would be assumed by Castelle as part of the Merger.

Accounting Treatment

     The  Merger  is  structured  to  qualify  as a  pooling  of  interests  for
accounting purposes.  Under this accounting  treatment,  the recorded assets and
liabilities  and the  operating  results of both  Castelle  and Ibex are carried
forward  to the  combined  operations  of the  surviving  corporation  at  their
recorded  amounts.  No recognition of goodwill in the combination is required of
either party to the Merger.

     To support  the  treatment  of the Merger as a pooling  of  interests,  the
affiliates of Castelle and Ibex have entered into  agreements  imposing  certain
resale  limitations  on their  stock.  See "-- Related  Agreements  -- Affiliate
Agreements"  above.  It  is  a  condition  to  each  of  Castelle's  and  Ibex's
obligations to consummate the Merger that, among other things,  Castelle receive
a letter from Coopers & Lybrand L.L.P., its independent  auditors, to the effect
that the  Merger  will be  treated  as a pooling  of  interests  for  accounting
purposes.

Affiliates' Restrictions on Sale of Castelle Common Stock

     The shares of  Castelle  Common  Stock to be issued in the Merger will have
been registered under the Securities Act pursuant to a Registration Statement on
Form S-4, thereby  allowing such shares to be traded without  restriction by all
former  holders of Ibex capital stock who (i) are not deemed to be  "affiliates"
of Ibex at the time of the Ibex Special Shareholders Meeting (as "affiliates" is
defined for purposes of Rule 145 under the  Securities  Act) and (ii) who do not
become  "affiliates" of Castelle after the Merger.  Ibex shareholders who may be
deemed to be "affiliates" of Ibex will be so advised prior to the Merger.

     The Merger Agreement  requires Ibex affiliates to enter into agreements not
to make any public sale of any Castelle Common Stock received upon conversion of
Ibex capital stock in the Merger prior to the date Castelle  shall have publicly
released  financial  results  for a  period  that  includes  at least 30 days of
combined operations of Ibex and Castelle, and thereafter not to make any sale of
Ibex Common Stock received upon  conversion of Ibex capital stock in the Merger,
except in  compliance  with Rule 145 under the  Securities  Act. See "-- Related
Agreements -- Affiliate Agreements" above. In general, Rule 145, as currently in

                                       51
<PAGE>

effect, imposes restrictions on the manner in which such affiliates,  who remain
affiliates  of Castelle  after the Merger,  may make resales of Castelle  Common
Stock  and also on the  number  of shares of  Castelle  Common  Stock  that such
affiliates,  and  others  (including  persons  with whom the  affiliates  act in
concert),  may sell  within any  three-month  period.  These  restrictions  will
generally  apply for at least a period of two years  after the Merger (or longer
if the person remains an affiliate of Castelle).

Dissenters' Rights

     If  the  Merger  Agreement  is  approved  by  the  required  vote  of  Ibex
shareholders  and is not abandoned or  terminated,  holders of Castelle and Ibex
capital  stock who did not vote in favor of the Merger  may, by  complying  with
Sections  1300 through 1312 of the  California  Law, be entitled to  dissenters'
rights as  described  therein.  It should be  noted,  however,  that  Castelle's
obligation to consummate  the Merger is conditioned on the fact that the holders
of no more than an  aggregate  of 2% of the  outstanding  shares of Ibex  Common
Stock are eligible to exercise  dissenters'  rights.  The record  holders of the
shares of Castelle and Ibex capital stock that are eligible to, and do, exercise
their  dissenters'  rights with  respect to the Merger are referred to herein as
"Dissenting  Shareholders,"  and the shares of stock with  respect to which they
exercise  dissenters' rights are referred to herein as "Dissenting Shares." If a
Castelle or Ibex shareholder has a beneficial  interest in shares of Castelle or
Ibex capital stock, respectively, that are held of record in the name of another
person,  such as a broker or nominee,  and such  shareholder  desires to perfect
whatever   dissenters'  rights  such  beneficial   shareholder  may  have,  such
beneficial  shareholder  must act promptly to cause the holder of record  timely
and properly to follow the steps summarized below.

     The following  discussion is not a complete statement of the California Law
relating to dissenters' rights, and is qualified in its entirety by reference to
Sections 1300 through 1312 of the California Law attached to this  Prospectus as
Appendix C and  incorporated  herein by reference.  This discussion and Sections
1300  through  1312 of the  California  Law should be reviewed  carefully by any
holder who wishes to exercise statutory dissenters' rights or wishes to preserve
the right to do so, since  failure to comply with the required  procedures  will
result in the loss of such rights.

     Shares of Castelle or Ibex capital stock must satisfy each of the following
requirements  to qualify as Dissenting  Shares under the California Law: (i) the
shares of  Castelle  or Ibex  capital  stock must have been  outstanding  on the
Record Date or the Ibex Record Date, as applicable;  (ii) the shares of Castelle
or Ibex capital stock must not have been voted in favor of the Merger; (iii) the
holder of such  shares of  Castelle  or Ibex  capital  stock must make a written
demand that Castelle or Ibex repurchase shares of Castelle or Ibex capital stock
at fair market value (as described below); and (iv) the holder of such shares of
Castelle or Ibex capital  stock must submit  certificates  for  endorsement  (as
described  below).  A vote by proxy or in person  against the Merger does not in
and of itself constitute a demand for appraisal rights under the California Law.

     Additionally, holders of more than 5% of the outstanding shares of Castelle
Common Stock would need to make a written demand that Castelle  repurchase their
shares for such shares to qualify as Dissenting Shares under the California Law.

     Pursuant to Sections 1300 through 1312 of the  California  Law,  holders of
Dissenting  Shares may require  Castelle or Ibex to repurchase  their Dissenting
Shares at a price equal to the fair market value of such shares determined as of
the day before the first announcement of the terms of the Merger,  excluding any

                                       52
<PAGE>

appreciation  or  depreciation  as a  consequence  of the proposed  Merger,  but
adjusted for any stock split, reverse stock split or stock dividend that becomes
effective thereafter.

     Within  ten days  following  approval  of the  Merger by  Castelle  or Ibex
shareholders,  the  company  whose  shareholders  have  approved  the  Merger is
required to mail to each holder of shares of that  company's  capital  stock not
voted in favor of the Merger a notice of the approval of the Merger, a statement
of the price  determined  by that company to represent  the fair market value of
Dissenting  Shares (which shall  constitute an offer by that company to purchase
such  Dissenting  Shares  at  such  stated  price),  and a  description  of  the
procedures for such holders to exercise their rights as Dissenting Shareholders.

     Within 30 days  after the date on which the notice of the  approval  of the
Merger  by the  outstanding  shares  is mailed  to  Dissenting  Shareholders,  a
Dissenting   Shareholder   must  demand  that  such  company   repurchase   such
shareholder's  Dissenting  Shares in a  statement  setting  forth the number and
class of Dissenting  Shares held of record by such Dissenting  Shareholder  that
the Dissenting Shareholder demands that the company purchase, and a statement of
what  the  Dissenting  Shareholder  claims  to be the fair  market  value of the
Dissenting  Shares as of the day before the announcement of the proposed Merger.
The statement of fair market value in such demand by the Dissenting  Shareholder
constitutes an offer by the Dissenting Shareholder to sell the Dissenting Shares
at such price  within  such 30-day  period.  Such holder must also submit to the
company or its transfer agent  certificates  representing any Dissenting  Shares
that the  Dissenting  Shareholder  demands  the company  purchase,  so that such
Dissenting  Shares may either be stamped or endorsed with the statement that the
shares are  Dissenting  Shares or  exchanged  for  certificates  of  appropriate
denomination so stamped or endorsed.

     If,  upon  the  Dissenting  Shareholder's  surrender  of  the  certificates
representing  the Dissenting  Shares,  the company and a Dissenting  Shareholder
agree  upon the price to be paid for the  Dissenting  Shares and agree that such
shares are  Dissenting  Shares,  then the agreed  price is required by law to be
paid to the Dissenting Shareholder within the later of 30 days after the date of
such agreement or 30 days after any statutory or  contractual  conditions to the
consummation of the Merger are satisfied or waived.

     If the company and a  Dissenting  Shareholder  disagree as to the price for
such Dissenting  Shares or disagree as to whether such shares are entitled to be
classified as Dissenting Shares, such holder has the right to bring an action in
California  Superior Court, within six months after the date on which the notice
of the  approval  of the Merger by the  company's  shareholders  is  mailed,  to
resolve such  dispute.  In such  action,  the court will  determine  whether the
shares of the company's  capital stock held by such  shareholder  are Dissenting
Shares,  the fair market value of such shares of the company's capital stock, or
both.  The  California  Law  provides,  among other  things,  that a  Dissenting
Shareholder  may not withdraw the demand for payment of the fair market value of
Dissenting  Shares  unless  Ibex  or  Castelle  consents  to  such  request  for
withdrawal.

Merger Expenses

     Castelle and Ibex estimate that they will incur direct transaction costs of
approximately   $650,000   associated  with  the  Merger.   These   nonrecurring
transaction costs will be charged to operations upon consummation of the Merger.
In addition,  Castelle  anticipates  incurring a charge upon consummation of the
Merger of  $200,000  to  $300,000  to reflect  costs and  expenses  relating  to
integrating  the two  companies.  See "Pro Forma  Condensed  Combined  Financial
Information" included elsewhere herein.

     Whether or not the Merger is consummated,  except as set forth below,  each
party will bear its own costs and expenses in connection with the Merger and the
transactions provided for therein.

                                       53

<PAGE>




     Castelle has agreed to reimburse  Ibex for the first $25,000 of audit fees,
costs and expenses  invoiced by Coopers & Lybrand L.L.P. and incurred by Ibex in
the audit by Coopers & Lybrand L.L.P.  of Ibex's fiscal years ended December 31,
1995 and 1994,  as well as one-half  of any  additional  audit  fees,  costs and
expenses  invoiced by Coopers & Lybrand  L.L.P.  Castelle has also agreed to pay
Unterberg  Harris a transaction fee of $250,000,  which amount has been included
in the direct  transaction  costs above, if the Merger is consummated.  Castelle
will also reimburse Unterberg Harris for the reasonable  out-of-pocket  expenses
incurred by  Unterberg  Harris in rendering  services to Castelle in  connection
with the  Merger.  See "The  Merger  and  Related  Transactions  --  Opinion  of
Financial Advisor to Castelle."

Regulatory Matters

     Castelle and Ibex are not aware of any governmental or regulatory approvals
required for consummation of the Merger,  other than compliance with the federal
securities  laws and  applicable  securities  and "blue sky" laws of the various
states.


                                       54

<PAGE>



          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

     The following unaudited pro forma condensed combined financial  statements,
including  the notes  thereto,  have been prepared to give effect to the Merger,
using the pooling of interests method of accounting,  and are qualified in their
entirety by reference to, and should be read in conjunction with, the historical
financial  statements  of  Castelle  and  Ibex,  including  the  notes  thereto,
incorporated elsewhere herein.

     The unaudited pro forma condensed  combined  financial  statements  reflect
certain assumptions deemed probable by management  regarding the proposed Merger
(e.g.,  that share  information used in the pro forma  information  approximates
actual share information at the effective date of the Merger). No adjustments to
the unaudited pro forma condensed combined financial  information have been made
to account for different  possible results in connection with the foregoing,  as
management believes that the impact on such information of the varying outcomes,
individually or in the aggregate, would not be materially different.

     The unaudited  pro forma  condensed  combined  balance sheet as of June 28,
1996 gives  effect to the Merger as if it had  occurred  on June 28,  1996,  and
combines the unaudited  condensed  consolidated  balance sheet of Castelle as of
June 28, 1996 and the unaudited  condensed  balance sheet of Ibex as of June 30,
1996.

     The unaudited pro forma condensed combined statements of operations combine
the  historical  consolidated  statements  of  operations  of  Castelle  and the
historical  statements  of  operations  of Ibex for each of the two years in the
period ended  December 31, 1995 (audited) and the six months ended June 28, 1996
(unaudited),  in each case as if the Merger had occurred at the beginning of the
earliest period presented.

     Castelle and Ibex estimate that they will incur direct transaction costs of
approximately  $650,000  associated  with the  Merger,  which will be charged to
operations  upon  consummation of the Merger.  In addition,  it is expected that
following the Merger,  Castelle will incur an additional  charge to  operations,
currently  estimated  to be between  $200,000  and  $300,000  to  reflect  costs
associated  with  integrating  the two  companies.  This range is a  preliminary
estimate only and is therefore subject to change. There can be no assurance that
Castelle will not incur additional  charges to reflect costs associated with the
Merger or that  management  will be  successful  in its efforts to integrate the
operations of the two companies.

     Such  unaudited  pro forma  condensed  combined  financial  information  is
presented for  illustrative  purposes only and is not necessarily  indicative of
the financial  position or results of  operations  that would have actually been
reported had the Merger occurred at the beginning of the periods presented,  nor
is it  necessarily  indicative  of a future  financial  position  or  results of
operations.  These unaudited pro forma condensed combined  financial  statements
are based upon the historical  consolidated financial statements of Castelle and
the  historical  financial  statements of Ibex and should be read in conjunction
with the respective financial statements and notes thereto of Castelle and Ibex,
included  elsewhere in this  Prospectus and do not incorporate any benefits from
cost savings or synergies of operations of the combined company.


                                       55

<PAGE>
<TABLE>
<CAPTION>



                      CASTELLE AND IBEX TECHNOLOGIES, INC.

              Unaudited Pro Forma Condensed Combined Balance Sheet
                                  June 28, 1996
                                 (in thousands)

                                                                                                 Pro                    Pro
                                                                                                Forma                  Forma
                                               Castelle                   Ibex               Adjustments              Combined
                                               --------                   ----               -----------              --------
                                              (unaudited)             (unaudited)            (unaudited)             (unaudited)
ASSETS
Current assets:
<S>                                             <C>                     <C>                                            <C>    
    Cash and cash equivalents.............      $ 7,416                 $  279                                         $ 7,695
    Accounts receivable...................        2,266                    929                                           3,195
    Inventories...........................        4,988                     36                                           5,024
    Prepaid expenses and other current assets       558                    114                                             672
                                                -------                 ------                                         -------
        Total current assets..............       15,228                  1,358                                          16,586
Property and equipment, net...............          374                    126                                             500
Other assets, net.........................           94                                                                     94
                                                -------                 ------                                         -------
        Total assets......................      $15,696                 $1,484                                         $17,180
                                                =======                 ======                                         =======

LIABILITIES AND SHAREHOLDERS'
EQUITY
Current liabilities:
    Notes payable.........................     $     --                $    25                                        $     25
    Accounts payable......................        1,869                    135                                           2,004
    Deferred revenue                                 --                    145                                             145
    Accrued liabilities...................        2,118                    102                                           2,220
    Income taxes payable .................                                 123                                             123
    Accrued integration and merger costs..                                                       $950(2)                   950
                                                -------                -------                   ----                  -------

        Total current liabilities.........        3,987                    530                    950                    5,467
                                                -------                -------                   ----                  -------

    Deferred income taxes.................                                  30                                              30
                                                                       -------                                         -------

Shareholders' equity:
    Preferred stock.......................                                 300                   (300)                      --
    Common stock..........................       23,298                     90                    300                   23,688
    Shareholder notes receivable..........         (296)                    --                     --                     (296)
    Accumulated deficit...................      (11,293)                   534                   (950)(2)              (11,709)
                                                -------                -------                   ----                  -------

        Total shareholders' equity........       11,709                    924                   (950)                  11,683
                                                -------                -------                   ----                  -------
        Total liabilities and
          shareholders' equity............      $15,696                 $1,484                 $    0                  $17,180
                                                =======                 ======                 ======                  =======

</TABLE>

     See accompanying  notes to unaudited pro forma condensed combined financial
statements.


                                       56

<PAGE>



                      CASTELLE AND IBEX TECHNOLOGIES, INC.

         Unaudited Pro Forma Condensed Combined Statements of Operations
                  Years Ended December 31, 1993, 1994 and 1995
                    (in thousands, except per share amounts)


<TABLE>
<CAPTION>

                                              Castelle                          Ibex                       Pro Forma Combined
                                    ---------------------------       -------------------------        --------------------------  
                                    1993        1994       1995       1993      1994       1995        1993       1994       1995
                                    ----        ----       ----       ----      ----       ----        ----       ----       ----
<S>                             <C>         <C>        <C>        <C>        <C>       <C>         <C>        <C>        <C>       
Net sales.....................  $  17,787   $  19,486  $  25,082  $   1,791  $  2,708  $   3,091   $  19,578  $  22,194  $   28,173
Cost of sales.................     11,346      11,503     13,571        554       691        732      11,900     12,194      14,303
                                ---------   ---------  ---------  ---------  --------  ---------   ---------  ---------  ----------
    Gross profit..............      6,441       7,983     11,511      1,237     2,017      2,359       7,678     10,000      13,870
                                ---------   ---------  ---------  ---------  --------  ---------   ---------  ---------  ----------

Operating expenses:
  Research and development....      2,152       2,179      2,018        245       432        648       2,397      2,611       2,666
  Sales and marketing.........      5,628       4,384      5,641        638       988      1,391       6,266      5,372       7,032
  General and administrative..      1,977       1,446      1,405        289       256        262       2,266      1,702       1,667
  Restructuring charge........        615          --         --         --        --         --         615         --          --
                                ---------   ---------  ---------  ---------  --------  ---------   ---------  ---------  ----------
    Total operating expenses..     10,372       8,009      9,064      1,172     1,676      2,301      11,544      9,685      11,365
                                ---------   ---------  ---------  ---------  --------  ---------   ---------  ---------  ----------
Operating income (loss).......     (3,931)        (26)     2,447         65       341         58      (3,866)       315       2,505
Interest income (expense).....       (349)       (481)      (296)        --        --         --        (349)      (481)       (296)
Other income (expense) net....       (515)        129        (53)         1        (8)        (4)       (514)       121         (57)
                                ---------   ---------  ---------  ---------  --------  ---------   ---------  ---------  ----------
Income (loss) before provision
  for income taxes............     (4,795)       (378)     2,098         66       333         54      (4,729)       (45)      2,152
Provision for (benefit from)
  income taxes                         --          --         74         39       121         (5)         39        121          69
                                ---------   ---------  ---------  ---------  --------  ---------   ---------  ---------  ----------
Net income (loss).............  $  (4,795)  $    (378) $   2,024  $      27  $    212  $      59   $  (4,768) $    (166) $    2,083
                                =========   =========  =========  =========  ========  ==========  =========  =========  ==========
Net income (loss) per share(1)  $  (12.11)  $   (0.91) $    0.77  $    0.15  $   1.11  $     0.30  $   (5.48) $   (0.17) $    $0.59
                                =========   =========  =========  =========  ========  ==========  =========  =========  ==========
Shares used in per share 
 calculation(1)                       396         414      2,673        174       191         199        870        949       3,519
                                =========   =========  =========  =========  ========  ==========  =========  =========  ==========
Pro Forma net income (loss)
 per share(2)                               $   (0.16)
                                             ========
Pro Forma shares used in per share
calculation(2)                                  2,396
                                             ========

</TABLE>

     See  accompanying   notes  to  pro  forma  combined   condensed   financial
statements.


                                       57

<PAGE>



                      CASTELLE AND IBEX TECHNOLOGIES, INC.

         Unaudited Pro Forma Condensed Combined Statements of Operations
                Six Months Ended June 30, 1995 and June 28, 1996
                    (in thousands, except per share amounts)
<TABLE>
<CAPTION>

                                           Castelle                         Ibex                   Pro Forma Combined
                                   -------------------------    ----------------------------  ----------------------------
                                       1995           1996            1995            1996          1995            1996
                                      ------         ------          ------          ------        ------          -----
                                   (unaudited)    (unaudited)     (unaudited)     (unaudited)   (unaudited)    (unaudited)
<S>                               <C>            <C>            <C>            <C>            <C>            <C>          
Net sales.......................  $    11,874    $    13,425    $      1,393   $       2,075  $     13,267   $      15,500
Cost of sales...................        6,385          7,117             355             444         6,740           7,561
                                  -----------    -----------    ------------   -------------  ------------   -------------
Gross profit....................  $     5,489    $     6,308           1,038           1,631         6,527           7,939
                                  -----------    -----------    ------------   -------------  ------------   -------------
Operating expenses:
  Research and development......  $       996    $     1,057             418             342         1,414           1,399
  Sales and marketing...........        2,785          3,199             660             760         3,445           3,959
  General and administrative....  $       623    $       718             129             153           752             871
                                  -----------    -----------    ------------   -------------  ------------   -------------
Total operating expenses          $     4,404    $     4,974           1,207           1,255         5,611           6,229
                                  -----------    -----------    ------------   -------------  ------------   -------------
Operating income (loss).........  $     1,085    $     1,334            (169)            376           916           1,710
Interest income (expense), net..         (192)           167                                          (192)            167
Other income (expense) net......           --            (75)             (5)             10            (5)            (65)
                                  -----------    -----------    ------------   -------------  -------------  -------------
Income (loss) before provision
  for income taxes                $       893    $     1,426            (174)            386           719           1,812
Provision for (benefit from)  
  income taxes                             23             64             (21)            162             2             226
                                  -----------    -----------    ------------   -------------  ------------   -------------
Net income (loss)...............  $       870    $     1,362    $       (153)  $         224  $        717   $       1,586
                                  ===========    ===========    ============   =============  ============   =============
Net income (loss) per share.....  $      0.34    $      0.35    $      (1.13)  $        1.11  $       0.21  $         0.33
                                  ===========    ===========    ============   =============  ============   =============
Shares used in per share
   calculation..................        2,648          3,887             135             201         3,487           4,744
                                  ===========    ===========    ============   =============  ============   =============



</TABLE>

                                       58

<PAGE>



                      CASTELLE AND IBEX TECHNOLOGIES, INC.

      Notes to Unaudited Pro Forma Condensed Combined Financial Statements

1. Pro Forma Basis of Presentation

     These unaudited pro forma condensed combined  financial  statements reflect
the  issuance of 791,549  shares of  Castelle  Common  Stock in exchange  for an
aggregate  of 160,251  shares of Ibex  Common  Stock and  28,800  shares of Ibex
Preferred Stock in connection with the Merger, assuming the fair market value of
a share of Castelle Common Stock on the business day  immediately  preceding the
Merger is $7.00.

<TABLE>
<CAPTION>

                                                                Preferred Shares                 Equivalent
                                                                to be Converted     Shares        Number of
                                                    Shares         to Common    Outstanding at    Castelle
                                                  Outstanding        Stock         Closing      Common Shares
                                               -------------------------------------------------------------- 
Ibex shares outstanding at June 30, 1996:
<S>                                                 <C>             <C>            <C>              <C>    
    Common.....................................     141,016         19,235         160,251          649,168
    Series A Convertible Preferred.............      48,035        (19,235)         28,800          142,381
                                                                                                    ------- 
Castelle Common Shares to be issued:...........                                                     791,549
Castelle Common Shares outstanding at June 28, 1996                                               3,620,844
                                                                                                  ---------
Total Castelle Common Shares outstanding after
    completion of the Merger...................                                                   4,412,393
                                                                                                  =========
</TABLE>


     The actual number of shares of Castelle Common Stock to be issued,  as well
as the exchange  ratios,  will be determined at the effective time of the Merger
based on the  closing  price  of  Castelle  Common  Stock  on the  business  day
immediately  preceding the Merger Date,  and the number of shares of Ibex Common
and Ibex Preferred Stock and Ibex Options outstanding.

2. Pro Forma Combined Balance Sheet

     Castelle  and Ibex  estimate  they will incur direct  transaction  costs of
approximately $650,000 associated with the Merger consisting of transaction fees
for investment  bankers,  attorneys,  accountants,  financial printing and other
related  charges.  These  nonrecurring  transaction  costs  will be  charged  to
operations upon  consummation  of the Merger.  It is expected that following the
Merger,  Castelle  will  incur an  additional  charge to  operations,  currently
estimated to be between  $200,000 and $300,000 to reflect costs  associated with
integrating  the two  companies.  The Pro Forma  Condensed  Balance  Sheet gives
effect to such costs  (estimated at $950,000 in total) as if such costs had been
incurred as of June 28, 1996.

     The direct transaction costs and additional charge are not reflected in the
Pro Forma Combined Condensed Statements of Operations.


                                       59

<PAGE>



     The following table  reconciles the numbers of shares used in the pro forma
per share  computations  to the  numbers  set  forth in  Castelle's  and  Ibex's
historical statements of operations:

<TABLE>
<CAPTION>

                                                                                                         Six Months
                                                                                                           Ended
                                                                       Years Ended December 31,           June 28,
                                                                       ------------------------         -----------   
                                                                           1994         1995                1996
Shares used in per share calculation (in thousands,                    -----------  -----------         -----------
  except estimated Applicable Fraction):
<S>                                                                            <C>        <C>                 <C>  
Historical - Castelle Common Shares..................................          414        2,673               3,887

Historical - Ibex Common Shares......................................          132          137                 138
Estimated Applicable Fraction........................................      4.05094      4.05094             4.05094
                                                                       -----------  -----------         -----------
Castelle Common Shares to be issued in return for Ibex Common Shares.          535          553                 558
                                                                       -----------  -----------         -----------

Historical - Ibex Outstanding options (1)............................                        14                  15
Estimated Applicable Fraction........................................      4.05094      4.05094             4.05094
                                                                       -----------  -----------         -----------
Castelle Common Shares to be reserved for Ibex Options...............           --           56                  62
                                                                       -----------  -----------         -----------

Historical Ibex Preferred Shares (1).................................                        48                  48
                                                                       -----------  -----------         -----------
Estimated Applicable Fraction........................................                   4.94378             4.94378
                                                                       -----------  -----------         -----------
Castelle Common Shares to be issued for Ibex Preferred Shares........           --          237                 237
                                                                       -----------  -----------         -----------

Shares used in proforma per share calculation........................          949        3,519               4,744
                                                                       -----------  -----------         -----------


</TABLE>
 

(1) Options and preferred shares not included as they would be anti-dilutive.


                                       60

<PAGE>



                              BUSINESS OF CASTELLE

General

     Castelle  designs,  develops,  markets  and  supports  network  enhancement
products, both software and hardware, that improve the productivity, performance
and  functionality  of local area  networks  ("LANs") and enhance the LAN user's
ability to communicate.  Castelle's current products include FaxPress fax server
systems,   JetPress  and  LANpress   print  servers  and  a  range  of  software
enhancements  for Castelle's  fax and print server  product  lines.  In February
1996,  Castelle entered the Small Office/Home Office ("SOHO") market through its
license agreement and joint marketing arrangement with 3Com Corporation ("3Com")
as the supplier of print,  fax, and CD-ROM  servers for 3Com's  Office-  Connect
products.  Castelle's  products  are  characterized  by  their  ease  of use and
installation,  reliability,  cost-effectiveness  and compatibility  with leading
network operating systems.

Industry Background

     In the mid-1980s,  organizations  began to interconnect  personal computers
into LANs in order to allow work groups to share files and  peripherals  such as
printers.  Originally,  these LANs consisted of a dedicated  personal  computer,
called a file server, on which the network  operating system was installed,  and
multiple  personal  computers on which users of the LAN ran their  applications.
The  network   operating   system  on  the  file  server   provided  the  server
administration  and basic file and print sharing.  As networks have proliferated
throughout organizations and client/server architectures have gained acceptance,
LANs have become increasingly complex, the size and graphical intensity of files
being  transmitted has increased and the applications  operating on the LAN have
become more  mission-critical.  These factors have caused network administrators
to seek network  enhancement  products  which can improve  network  performance,
enhance the  functionality of the current installed base of network hardware and
cost-effectively  convert single-user resources such as stand-alone printers and
telephone lines into shared LAN resources. Fax servers and print servers are two
of the  primary  network  enhancement  solutions  that have  emerged  to provide
cost-effective improvements in network performance and functionality.

     Fax  Servers.  Fax machines  typically  used in business  environments  are
characterized  by relatively low quality  transmissions,  low data  transmission
rates and the inability to send and receive faxes  simultaneously.  Fax machines
also  require  labor-intensive  sorting,  copying  and routing of faxes in paper
form. Alternatively,  a dedicated personal computer with a fax modem, while able
to  store  incoming  faxes  electronically  and  improve  fax  quality,  is  not
economical in a LAN  environment  because each user must have his or her own fax
modem,  and dedicated  telephone line. Fax servers have emerged as an economical
alternative for providing high performance faxing capability to network users. A
fax  server  connects  a LAN to one or more  telephone  lines,  enabling a large
number of users to share dedicated telephone lines. Users are able to send faxes
directly from their computers or  workstations,  eliminating the need to print a
document, take it to a stand-alone fax machine and wait for its transmission. In
addition, a fax server can sort incoming faxes and route them electronically and
confidentially  directly to the electronic  mailboxes of the intended recipients
and store non-urgent outgoing faxes for automatic  transmission at an "off-peak"
time when telephone rates are lower.

     Print  Servers.  The sharing of  printers,  a basic  benefit of a LAN,  has
traditionally  been  provided by  connecting a printer  either to a network file
server or to a dedicated  personal  computer  on the  network.  However,  direct
connection to the file server has several  disadvantages,  including the risk of

                                       61
<PAGE>

the file server being overburdened by the processing  required to print large or
graphically   complex   files,   lower  print   transfer   speeds  and  location
inflexibility.  Similarly,  printer connection to a dedicated personal computer,
while  providing  better  location  flexibility,   is  more  costly  and  offers
substantially  lower print file transfer speed than a dedicated print server can
provide.  A  print  server  directly  connects  one or more  printers  to a LAN,
providing a cost-effective,  high-speed  solution to the demand for shared print
resources  on  a  LAN.  In  addition  to  providing  location   flexibility  and
convenience,  print servers improve network  performance by relieving the burden
on the file server. Furthermore,  print servers enable users to access essential
information  about the status of the printer and their print files and to select
their desired printer configuration.

     Network enhancement solutions,  such as fax servers and print servers, have
emerged to gain  significant  market  acceptance due to their ability to improve
network performance and personal productivity, enhance network functionality and
preserve the investment many companies have made in network  hardware.  Castelle
believes  that  as  the  client/server  computing  paradigm  continues  to  gain
acceptance  and  mission-critical   applications  continue  to  be  ported  from
mainframes  and  minicomputers  to LANs,  corporate  processes  will become more
dependent on the LAN and the performance enhancement that can be achieved on the
corporate LAN will more directly impact overall  productivity.  As LAN users and
network  managers  continue to  recognize  the  benefits of network  enhancement
products,  and as additional network  functionality  such as  facsimile/document
communication across the Internet, remote access, scanning,  electronic mail and
multimedia  communications continue to emerge, Castelle believes that the demand
for such network enhancement products will increase.

Castelle Strategy

Castelle's   objective  is  to  be  a  leading  worldwide  supplier  of  network
enhancement  solutions.  Castelle  intends to  continue  to  provide  innovative
products  focused on  enhancing  the LAN  user's  ability  to  communicate.  Key
elements of Castelle's strategy include:

     Focus on Network  Enhancement  Products.  Castelle  focuses  exclusively on
providing innovative,  reliable, easy-to-use network enhancement products. Since
its  inception,  Castelle has focused on  developing  networking  products  that
utilize advanced software to tightly integrate proprietary hardware systems with
standard computing platforms.  As a result, Castelle believes it has developed a
high level of expertise in networking, software development, hardware design and
telephony  technology.  Castelle  plans to  capitalize  on these  attributes  by
continuing to focus on providing network enhancement products which enable users
to communicate more effectively.

     Broaden Software Offerings.  In order to leverage its significant installed
base of fax and print  servers,  Castelle is  developing a range of  value-added
software  options which increase the  functionality  of Castelle's  products and
enable  them to  address  specialized  applications.  Examples  of  applications
currently   available  include  electronic  mail  gateways,   optical  character
recognition/image  enhancement and billing/analysis and other management utility
software.  Utilizing  an  extensive  internal  database of over 3,000  corporate
end-users,  Castelle is marketing these products through a direct  telemarketing
team.

     Expand Product Line.  Castelle is leveraging its expertise in  easy-to-use,
cost-effective  enhancement  solutions  to offer new network and  communications
enhancement  products.  In  addition to its recent  efforts in the SOHO  market,
Castelle continues to expand both its fax server and print server product lines.


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<PAGE>



     Penetrate the Small Office/Home Office Market. As the productivity benefits
of  networks  have  been  demonstrated,   small  offices  and  businesses  which
previously   have  used   stand-alone   personal   computers   are  now  seeking
cost-effective devices which provide basic printing and faxing functionality and
are easy to use,  install  and  maintain.  Castelle  is  addressing  this market
through its licensing and joint marketing  agreement with 3Com in which Castelle
provides print and fax workgroup server modules for 3Com's OfficeConnect product
line.

     Strengthen and Expand  Distribution  Channels.  Castelle has  established a
two-tier domestic and international distribution network of leading national and
regional network product distributors and resellers. Castelle also sells through
leading system integrators such as Electronic Data Systems, Inc. ("EDS") and OEM
vendors  such as Ricoh  Corporation  ("Ricoh")  and  Fujitsu  Ltd.  ("Fujitsu").
Castelle is expanding its  distribution  network in North America,  Europe,  the
Asia-Pacific and Latin American regions and other markets in order to capitalize
on the rapid growth in LANs in these regions.

     Leverage Strategic Relationships. Castelle augments its product offering by
establishing  relationships  with  companies  able to provide  products in areas
outside of Castelle's core technical competencies or in instances where internal
development of such products is not  cost-effective.  Castelle also  establishes
relationships  with  numerous  leaders in hardware  and software  technology  to
enable it to keep abreast of, and respond quickly to, technological changes that
may affect the network enhancement market.

Products

     Castelle  develops  and  markets a broad  range of  products  that  enhance
network productivity, performance and functionality. Castelle's current products
include  FaxPress fax server systems,  JetPress and LANpress print servers and a
range of software  enhancements  for its fax and print server product lines.  In
1996, Castelle entered the SOHO market through its licensing and joint marketing
agreement with 3Com which  provides  print and fax workgroup  server modules for
3Com's OfficeConnect product family.

Fax Servers

     Castelle's fax server product line includes  FaxPress fax server systems as
well as FaxPress software.  Castelle's line of FaxPress software includes client
applications  and  interfaces  for use with the  FaxPress  system  and  software
enhancements and options.  Castelle's fax server products allow network users to
send,  receive,  route,  print,  store, edit and retrieve fax transmissions from
their own personal  computers  on a LAN.  These fax server  products  enable all
network  users to access fax services  without  requiring a large  investment in
stand-alone  fax  machines,  fax modem  boards or  additional  telephone  lines.
Network-based  fax  capability  is  a  logical  extension  of  network  printing
capability,  enabling  users to transmit  documents  directly to a fax device as
easily as if they were printing to a laser printer or sending an electronic mail
message.  Network fax servers redirect fax output from applications running on a
LAN user's personal  computer or workstation to a fax queue. The fax server then
converts  the file to fax  format and sends the fax to the  intended  recipient.
Castelle's FaxPress products are designed to comply with regulatory standards in
the United  States as well as  Australia,  Canada,  Germany,  Hong Kong,  Japan,
Korea, the Netherlands,  Singapore, Switzerland and the United Kingdom. Castelle
is seeking regulatory clearance in a number of other countries. During the first
six  months of 1996,  fax  servers  represented  approximately  44% of total net
sales. During 1995 and 1994, fax servers represented 44% and 36%,  respectively,
of total net sales.


                                       63

<PAGE>



     FaxPress   Systems.    Castelle's   FaxPress   fax   server   systems   are
high-performance   network-based   fax   solutions.   FaxPress   is  a  compact,
self-contained  fax server that connects directly to a LAN and is accompanied by
software that is installed from any personal computer or workstation on the LAN.
FaxPress system products are available in  configurations  that support one, two
or four dedicated  telephone  lines.  In addition,  FaxPress system products can
function as parallel and serial port print servers. Key features of the FaxPress
product line (configured with its current software versions) include:

     o    Ability to send faxes from many applications:  Easy faxing from within
          any Windows,  Windows 95, Windows NT and DOS  application  and certain
          electronic mail  applications.  Castelle  expects to introduce  client
          software for the Macintosh in the second quarter of 1996.

     o    Electronic  routing of faxes:  Electronic  routing  of faxes  enhances
          efficiency and  confidentiality  through electronic delivery direct to
          the electronic mailbox of the intended recipient.

     o    Retention of document  formatting:  Retention  of all text,  fonts and
          graphics generated by PCL and other leading document format languages.
          Any document  that can be printed to a  Hewlett-Packard  laser printer
          can be faxed using the FaxPress system.

     o    Ability to use fax servers in tandem: Load sharing between fax servers
          provides the capability to stack up to five fax server units and share
          up to 20 modems for outbound faxing.

     o    No waiting for document  conversion:  Internal image processing by the
          FaxPress  provides high image quality and frees the personal  computer
          for  end-user  applications.  The  user  does  not  have to wait for a
          document to be  converted  to a fax image  before  using the  personal
          computer for other tasks.

     o    Group  broadcasts/scheduled   transmission:  Delayed  sending  feature
          allows  users to send  faxes  during  "off-peak"  hours,  facilitating
          low-cost communications for group broadcast and other uses.

     Castelle  offers a family of  FaxPress  fax  server  systems  ranging  from
entry-level  products to high-end fax solutions  capable of supporting  over 500
users. The suggested U.S. list prices for FaxPress fax servers range from $1,695
to $5,795.  The following table  summarizes  Castelle's  FaxPress system product
line:

<TABLE>
<CAPTION>

- --------------------------------------------------------------------------------------------------------------------------
     
                                               
                                                                                      NetWorking Environment        
                      Number      Number of                                           ---------------------- 
                        of          Micro-       Memory                               NetWare,       Windows       TCP/IP  
Product Model         Modems      processors   (Megabytes)   Network Topology         3.x, 4.x         NT          Support  
- --------------------------------------------------------------------------------------------------------------------------
<S>                     <C>           <C>          <C>                                                                  
OfficeConnect Fax       1             1            4         Ethernet                    x              x             x 
FaxPress 1500        1 or 2           1            4         Ethernet                    x                            x 
FaxPress 1500-N      1 or 2           1            8         Ethernet                    x              x             x 
FaxPress 3000        2 or 4          2-3           4         Ethernet/Token Ring         x                            x 
FaxPress 3500        2 or 4          2-3           8         Ethernet/Token Ring         x              x             x 
- --------------------------------------------------------------------------------------------------------------------------

</TABLE>

     o    FaxPress  Software.  Castelle's  line of  FaxPress  software  includes
          client  applications  and interfaces for use with FaxPress systems and
          software enhancements and options.


                                       64

<PAGE>



     o    Client  Applications  and  Interfaces:   Castelle  has  developed  fax
          applications,  available for both Windows and DOS environments,  which
          reside on the LAN user's personal computer and are included as part of
          Castelle's  FaxPress products.  For the user who has already installed
          other third-party fax application  software,  Castelle offers software
          that  enables  the  user to  access  the  capabilities  of  Castelle's
          FaxPress  products  through such  third-party  software.  In addition,
          Castelle is developing an interface which enables Macintosh clients to
          send and receive faxes  through  FaxPress  systems.  Castelle has also
          developed utilities that permit network and systems  administrators to
          monitor and control the routing of fax files.

     o    Software  Enhancements  and  Upgrades:  Castelle  offers  a  range  of
          value-added  software  options  which  increase the  functionality  of
          Castelle's  FaxPress  systems  and  enable  the  FaxPress  to  address
          specialized applications.  Software upgrades and options are available
          to the installed base of FaxPress units at prices ranging from $495 to
          $995. The following table describes the available software options:

- --------------------------------------------------------------------------------
Software Option                                    Description
- --------------------------------------------------------------------------------
Lotus                                              cc:Mail  Gateway   Integrates
                                                   the FaxPress into the cc:Mail
                                                   environment,  enabling  users
                                                   to  send  and  receive  faxes
                                                   within cc:Mail.
Novell                                             MHS Mail  Gateway  Integrates
                                                   the FaxPress  into any Novell
                                                   MHS-compatible     electronic
                                                   mail  application,   enabling
                                                   users  to  send  and  receive
                                                   faxes  within the  electronic
                                                   mail package.
Novell                                             GroupWise Gateway  Integrates
                                                   the FaxPress into  GroupWise,
                                                   enabling  users  to send  and
                                                   receive faxes from  GroupWise
                                                   in    addition   to   sending
                                                   documents in native format as
                                                   fax attachments.
Lotus                                              Notes Gateway  Integrates the
                                                   FaxPress  into  Lotus  Notes,
                                                   enabling  users  to send  and
                                                   receive   faxes   from  Lotus
                                                   Notes.
Embedded                                           Codes     Gateway     Enables
                                                   mainframe  computer  users to
                                                   send faxes using the FaxPress
                                                   server.
Optical Character Recognition/                     Enables an incoming fax to be
                                                   converted into an editable
                                                   format.
Image Enhancement                                  Image  enhancement capability
                                                   enables     the    electronic
                                                   editing  of a  fax  image  to
                                                   correct visual defects.
Billing and Analysis Software                      Analyzes and  allocates  cost
                                                   of faxing by user, department
                                                   or   customer   and   creates
                                                   "ready to print" reports.    
FaxPress  Print Server  Software                   Enables  the FaxPress  to act
                                                   as a network print server.
- --------------------------------------------------------------------------------

Print Servers

     Castelle's  print  server  products   perform  network  printing   services
otherwise handled by a file server or a dedicated  personal  computer.  Castelle
offers a family of  multi-protocol  external  and  internal  print  servers that
enhance overall network performance by reducing the burden on the file server or
a  dedicated  personal  computer.  During  the first six  months of 1996,  print
servers  represented 55% of total net sales. During 1995 and 1996, print servers
represented 56% and 64%, respectively, of total net sales.

     Castelle believes its print servers provide a superior method of connecting
printers to a LAN for a number of reasons, including:


                                       65

<PAGE>



     o    Network  performance  enhancement:  Castelle's  print  servers  enable
          substantially  higher  print file  transfer  speeds than file  servers
          while  reducing  the  data  transfer  and  processing  burden  on file
          servers.

     o    Plug-and-play  in  a  multi-protocol  environment:   Castelle's  print
          servers  offer easy  installation  and  configuration,  with  multiple
          protocols  enabling  a  seamless  integration  into  a  mixed  network
          environment.  This is not possible  using either a dedicated  personal
          computer or a file server.

     o    Location flexibility: Castelle's print servers are self-contained, can
          be located anywhere on a network and can support printer-clustering as
          well as single printer connectivity.

     o    Cost-effectiveness:  Castelle's print servers are more  cost-effective
          than dedicated personal computers or direct file server connections.

     o    Compatibility:  Castelle's  print servers are compatible with printers
          from virtually all major printer  vendors and support  leading network
          operating systems.

     LANpress  Product Line.  Castelle's  LANpress  products are external  print
servers that are independent nodes on a network. They represent superior methods
of connecting printers to a LAN due to their multi-protocol capabilities. With a
variety of configurations for a single printer or up to 4 printers,  and support
for NetWare (true NDS), UNIX,  Windows NT and Appletalk,  LANpress is compatible
with printers with standard parallel or serial interfaces and is targeted at the
large installed base of stand-alone printers. LANpress has remote management and
configuration  features  enabling the network  administrator  to check for print
queues and status,  locate sources of problems and reconfigure  units within the
network from anywhere on the LAN. LANpress  selectively  routes to all networked
printers  and thereby  improves  the  productivity  of all  printers  across the
network.  LANpress  products  can  serve up to 64 print  queues on up to 16 file
servers.  The suggested  U.S. list price for LANpress  print servers ranges from
$379 to $719.

     The following table summarizes  Castelle's line of LANpress  external print
servers:

<TABLE>
<CAPTION>


- ------------------------------------------------------------------------------------------------------------------------ 
                                                                                                            
                                                                                                            
                            Network Topology                        Networking Environment                  
                           -----------------       --------------------------------------------------          Flash   
     Product                           Token             NetWare       UNIX      Windows      Apple           Upgrade  
 Configuration (1)         Ethernet    Ring          2.x, 3.x, 4.x    TCP/IP       NT       Ethertalk        Capability
- ------------------------------------------------------------------------------------------------------------------------ 
<S>                 <C>                                                                                             
OfficeConnect Print (1)       x                            x             x          x                             x 
LanPress Jr. MP (2)           x                            x             x          x            x                x 
LanPress 1P MP (3)            x                            x             x          x            x                x 
LanPress 2+1 MP (4)           x          x                 x             x          x            x                x 
LanPress 3+1 MP (4)           x                            x             x          x            x                x 
- ------------------------------------------------------------------------------------------------------------------------ 

</TABLE>

(1)      2 Centronics parallel ports
(2)      Connects directly to port on Printer
(3)      1 Centronics parallel port
(4)      Numbers refer to the number of parallel and serial port connections,
         respectively.

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<PAGE>



     JetPress  Product Line.  Castelle's  JetPress  products are easy to install
plug-and-play  internal  print servers that are inserted  into the  input/output
expansion  slots of a printer  and do not  require  software  on a network  file
server. The JetPress print servers are compatible with Hewlett-Packard  LaserJet
models  II,  III,  IIISi,  4, 4M,  4Si,  PaintJet  XL300,  DesignJet  and  other
Hewlett-Packard  printers with MIO  expansion  slots.  JetPress is  considerably
faster  than most  external  network  print  server  devices  due to its  direct
interface  with the printer.  JetPress print servers  streamline  shared printer
operations on a LAN by supporting up to 32 print queues on up to eight different
file servers. Castelle's JetPress works in both Novell Netware (2.x/3.x/4.x) and
UNIX  environments  allowing printers to be placed anywhere on the LAN. A Novell
user can submit a print job to a LaserJet  with a JetPress  board,  while at the
same time another user can submit a print job from a UNIX system.  The family of
JetPress models are available today for both Ethernet and Token Ring topologies.
The  suggested  U.S. list price for JetPress  print servers  ranges from $549 to
$749.

     The following table summarizes  Castelle's line of JetPress  internal print
servers:

<TABLE>
<CAPTION>

- -------------------------------------------------------------------------------------------------------- 
                                                                  Networking Environment
                            Network Topology         ---------------------------------------------------
                           ------------------              Netware               
        Product                         Token        ---------------------        UNIX         Windows
   Configuration (1)       Ethernet     Ring         2.x     3.x      4.x        TCP/IP          NT 
- -------------------------------------------------------------------------------------------------------- 
         XIO                              x           x       x                    x              x 
         <S>                 <C>         <C>         <C>     <C>      <C>         <C>            <C>
         MIO+                 x           x           x       x        x           x              x 
- -------------------------------------------------------------------------------------------------------- 

</TABLE>

     (1) Refers to compatibility with printer input/output expansion slots.

Small Office/Home Office Market: The OfficeConnect Family of Products

     Castelle  has  partnered  with 3Com to develop  the  OfficeConnect  product
family  to  target  the  SOHO  marketplace.  Under  the  agreement  between  the
companies,  each party maintains proprietary rights to the products it develops.
Castelle has been  responsible  for developing the fax and print server modules,
while 3Com has been responsible for the hub unit and Integrated Services Digital
Network  ("ISDN")  dial-up  router.  Castelle  and 3Com  have  engaged  in joint
marketing activities to promote the products.  The sales and marketing personnel
of each company  have been  provided  with  technical  training and  promotional
literature by the other company and the companies have cooperated in trade shows
and other promotional  activities such as advertising and direct mail marketing.
Both the fax server and print server  modules have the same look and feel as the
3Com  OfficeConnect  products.  Castelle's  fax  server  module  is a  low-cost,
single-line,  workgroup-based fax sharing device. Castelle's print server module
has two  parallel  ports and is software  upgradeable  using flash  memory.  The
network  operating  systems  supported  by the fax server  include  NetWare  and
Windows NT. The print servers also provide support for UNIX and peer-to-peer.

     OfficeConnect CD-ROM Server.  Castelle is introducing another member to the
OfficeConnect   family.   The  OfficeConnect   product  line  offers  integrated
networking  solutions focused on the needs of the small office and branch office
environments. The OfficeConnect CD-ROM Server, presently scheduled to be shipped
in the fourth quarter of 1996, will allow multiple users across the LAN to share
information  on CD-ROMs  simultaneously.  The CD-ROM server is a  multi-protocol
unit designed to provide  simultaneous  network  access for up to seven attached
CD-ROM  drives.  It  offers  many of the key  benefits  that  differentiate  the

                                       67
<PAGE>

OfficeConnect  family from the competition,  including easy  installation,  easy
manageability,  reliability  and  advanced  technology.  Castelle  has  licensed
certain CD-ROM technology from Compact Devices, Inc., an acknowledged technology
leader  in  CD  Server  technology,  in  order  to  address  key  time-to-market
objectives with this new product.

Products Under Development

     Hewlett-Packard Scanner Integration. In April 1996, Castelle entered into a
joint  marketing and development  relationship  with  Hewlett-Packard's  Scanner
division to integrate its FaxPress product line with Hewlett  Packard's  ScanJet
product family. This integration will allow users on a network to instantly scan
in  documents,  edit them,  and fax them out without the use of  standalone  fax
machines or scanners.  This partnership is designed to provide users the benefit
of increased speed and higher quality.

     FaxPress Systems. Castelle is continuing to expand and enhance its FaxPress
product line.  Ongoing  projects  include the  development of a new  intelligent
modem board that will  support up to four  28,800 bps modems.  This new board is
being  designed  to comply with the latest fax  standards  and to allow a single
FaxPress unit to support up to eight telephone lines.

     FaxPress  Software.  Castelle is currently  developing a number of software
enhancements  for  its  FaxPress  product  line  including   Microsoft  Exchange
compatibility, an Internet browser gateway and an improved user interface.

     o    Microsoft Exchange  Compatibility.  Microsoft  Exchange  compatibility
          will enable  Microsoft  Exchange users to send and receive faxes using
          the  FaxPress.  In  addition,  this  gateway  will enable  binary file
          transfer  from a  FaxPress  client to  another  FaxPress  client or an
          Exchange client.

     o    Internet  Browser  Gateway.  The  Castelle  Internet  Browser  Gateway
          software will allow the FaxPress server to respond to Hypertext Markup
          Language ("HTML")  requests.  HTML is the predominant  language of the
          World  Wide Web.  With this  server  software,  any LAN user,  whether
          connected   to  a  LAN  locally  or  as  a  mobile   user   through  a
          communications  gateway, will be able to use a World Wide Web browser,
          such as the  popular  browser  developed  by  Netscape  Communications
          Corporation,  to access the FaxPress  server "home page fax  director"
          and view  incoming  faxes or to send a fax.  This  gateway  capability
          allows  UNIX users with www browser to send and  receive  faxes,  even
          though FaxPress does not presently support the UNIX operating system.

     o    User  Interface.  Castelle  continues to improve its user interface by
          adding new functionality such as a more advanced phone book structure,
          allowing  for  additional  cover  pages,  making  it  easier to attach
          documents for transmission and providing a new look and feel for wider
          user acceptance.

Research and Development

     Castelle was an early entrant into the fax server and print server  markets
and has made  substantial  investments  in  research  and  development.  Most of
Castelle's  product  development  initiatives during these periods were directed
towards  fax server  products  although  much of the  resultant  technology  has
application to the further  development of Castelle's print server  products.  A
significant  percentage  of  Castelle's  research and  development  expenses are
related to software  development.  Castelle  believes that its continued success
will depend in part upon its ability to enhance its existing products, introduce
new  products on a timely  basis,  maintain  compatibility  with new releases of
network  operating  systems and other relevant  software and continue to develop

                                       68
<PAGE>

technology  that can be incorporated  into products that meet changing  end-user
requirements.  Castelle  intends to  leverage  its  proprietary  technology  and
industry  expertise  into new product  offerings  that it believes  will further
enhance network users' productivity.  In addition,  Castelle intends to continue
to expand the software  component of its products to enhance  functionality  and
improve performance.

     To  facilitate  product  development,   Castelle  works  closely  with  its
end-users,  VARs,  distributors and strategic  partners to identify market needs
and define product  specifications early in the development process. In order to
develop  products  successfully,  Castelle  is  dependent  on  timely  access to
information about new developments in the marketplace. There can be no assurance
that  Castelle  will have such  access  or that it will be able to  develop  new
products  successfully and respond  effectively to  technological  change or new
product announcements by competitors.

Sales, Marketing and Distribution

     Castelle  sells its products  through  multiple  channels  depending on the
product, market and customer need. Castelle has an established two-tier domestic
and international  distribution network of leading national and regional network
product  distributors and resellers.  Castelle also sells through leading system
integrators  such as EDS and OEM  vendors  such as Ricoh and  Fujitsu.  Software
enhancements and options that complement the FaxPress product line are primarily
marketed  directly by Castelle to registered  end-users.  The direct sales group
works closely with the distributors  and VARs in qualifying sales  opportunities
for the fax server and print server  product  lines.  Castelle is expanding  its
distribution  network in North  America,  Europe,  the  Asian-Pacific  and Latin
American  regions and other markets in order to  capitalize  on the  anticipated
growth  in  LANs in  these  regions.  Castelle's  European  headquarters  in the
Netherlands  provides  sales  and  support  services  to a  distributor  network
covering most  European  countries,  with a primary  emphasis on Germany and the
United Kingdom.

     Demand for  Castelle's  products  is created  through  targeted  and active
participation in industry  networking and communication  trade shows, as well as
advertising in associated  publications.  Castelle also  increases  awareness of
Company  products  through  advertising,  generating  client leads,  instituting
direct mail campaigns,  sending Company  newsletters,  offering seminars,  trade
shows and conferences and other forms of public  relations  efforts.  Castelle's
sales and  marketing  efforts  are  enhanced by a specific  program  designed to
encourage VARs and other resellers to promote and sell Castelle's products. Such
promotion is encouraged by providing  participants in the program with technical
support on a priority  basis,  product  literature,  on-site  sales and  support
training,  sales  leads,  free  software  upgrades,  and  other  forms  of sales
promotions.  In addition to its other  activities,  Castelle's  marketing  staff
employs various research methods,  gathering  information from many sources such
as VARS and other resellers,  customers,  distribution  partners,  OEM partners,
strategic partners, and press/publication groups. Product development, sales and
client  services/support  personnel  benefit  from the  information  gathered in
planning future products.

     Castelle's five largest distributors accounted for approximately 77% of its
net sales in the first six months of 1996,  70% of its net sales in 1995 and 67%
of its net sales in 1994. Macnica,  Castelle's  principal Japanese  distributor,
and  Ingram  Micro,  Castelle's  largest  domestic  distributor,  accounted  for
approximately 38% and 16%,  respectively,  of Castelle's net sales for the first
six months of 1996, 29% and 18%, respectively, of its net sales in 1995, and 17%
and 23%,  respectively,  of its net sales in 1994. Sales to customers located in

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the Pacific Rim and Europe made up approximately  56%, 52% and 42% of Castelle's
net sales in the first six months of 1996, all of fiscal 1995, and all of fiscal
1994,  respectively.  The Pacific Rim has been the  fastest  growing  sector for
Castelle  primarily due to strong market growth and a relationship with Macnica.
Castelle's  distributors  typically  represent  other  product  lines  that  are
complementary to or compete with, those of Castelle.  While Castelle attempts to
encourage  its  distributors  to focus on its  products  through  marketing  and
support  programs,  these  distributors  may give higher priority to products of
other suppliers,  thereby reducing the efforts they devote to selling Castelle's
products. In particular,  certain of its competitors,  including Hewlett-Packard
and Intel,  sell a substantially  higher total dollar volume of products through
several  of  Castelle's  large  United  States  distributors  and,  as a result,
Castelle  believes such distributors give higher priority to products offered by
such competitors.  Castelle's  distributors are not  contractually  committed to
future  purchases  of  Castelle's   products  and  could  discontinue   carrying
Castelle's products at any time for any reason. In addition, because Castelle is
dependent on a small number of  distributors  for a  significant  portion of the
sales of its products, the loss of any of Castelle's major distributors or their
inability  to  satisfy  their  payment  obligations  to  Castelle  could  have a
significant  adverse  effect  on  Castelle's  business  and  operating  results.
Castelle  has a stock  rotation  policy with certain of its  distributors  which
allows  them to  return  marketable  inventory  against  offsetting  orders.  In
addition,  due to industry  conditions or the actions of competitors,  inventory
levels of  Castelle's  products  held by  distributors  could  become  excessive
resulting in product  returns and inventory write downs. In 1993, as a result of
offering  extended  payment  terms  and  other  pricing  promotions  to  certain
distributors,  Castelle  experienced  returns  from  distributors  which  had  a
material adverse effect on Castelle's operating results.

Customer Service and Support

     A major requirement of Castelle's  customers is quality support,  available
at all times to assist customers with  installation,  use and operation  issues.
Castelle  has network  engineers  at  corporate  headquarters  as well as in the
field.  Support is provided under  warranty as well as with  different  extended
software  and  hardware  support  agreements  sold  directly to the  customer by
Castelle. An electronic bulletin board is available on a 24-hour basis to assist
customers in obtaining  pertinent  facts.  Castelle is also  implementing  other
customer  support  activities,  including  a World  Wide  Web site as well as an
internal  help desk  system.  Castelle's  technical  support is also  accessible
through CompuServe.

Competition

     The network enhancement products market is highly competitive, and Castelle
believes  that  such  competition  will  intensify  in  the  future.   Increased
competition, direct and indirect, could adversely affect Castelle's business and
operating  results  through  pricing  pressure,  loss of market  share and other
factors.  The principal  competitive factors affecting the market for Castelle's
products include product functionality,  performance, quality, reliability, ease
of use, quality of customer training and support,  name recognition,  price, and
compatibility  and conformance with industry  standards and adapting to changing
operating  environments.  Castelle currently competes  principally in the market
for network  print  servers and  network  fax servers and  software.  Several of
Castelle's existing and potential competitors,  most notably Hewlett-Packard and
Intel, have  substantially  greater  financial,  engineering,  manufacturing and
marketing  resources than does Castelle.  Castelle also experiences  competition
from a number  of other  companies.  In  addition  to its  current  competitors,
Castelle may face  substantial  competition  from new entrants  into the network
enhancement  market,  including  established  and  emerging  computer,  computer
peripherals,  communications  and software  companies.  As Castelle creates more
software products, it will come into increasing  competition with companies such
as Symantec  Corp.  and  Cheyenne  Software  Inc.  who are  producing  competing
products. There can be no assurance that competitors will not introduce products

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incorporating  technology  more  advanced  than that of  Castelle.  In addition,
certain competing  methods of communications  such as the Internet or electronic
mail could adversely  affect the market for fax products.  Certain of Castelle's
existing  and  potential  competitors  are  manufacturers  of printers and other
peripherals,  and these  competitors may develop closed systems  accessible only
through their own proprietary  servers.  There can be no assurance that Castelle
will  be able to  compete  successfully  or that  competition  will  not  have a
material adverse effect on Castelle's business and operating results.

Manufacturing

     Castelle's current in-house  manufacturing  operations consist primarily of
material planning, final test and assembly,  quality control and service repair.
Certain of  Castelle's  manufacturing  operations  are  performed by third party
manufacturers  that  provide  customized,   integrated  manufacturing  services,
including  procurement,  manufacturing  and  associated  printed  circuit  board
assembly.  Castelle  also  relies on SerComm  to provide it with  certain of its
print server products. These arrangements enable Castelle to shift certain costs
to such providers,  thereby allowing  Castelle to focus resources on its product
development efforts. The failure of such manufacturers, particularly SerComm, to
meet their  contractual  commitments  to Castelle  could cause delays in product
shipments, thereby potentially adversely affecting Castelle's operating results.

     Castelle does not currently  have a long-term  supply  contract with any of
its manufacturing  subcontractors or component suppliers except for an agreement
with SerComm  relating to the  manufacture of print  servers.  Castelle owns all
engineering and sourcing documentation and functional test equipment and tooling
used in  manufacturing  its  products,  except  for the  products  which will be
produced by  SerComm,  and  believes  that it could  shift  product  assembly to
alternate suppliers if necessary. Certain key components of Castelle's products,
including  Token Ring  interface  modules from Silcom  Manufacturing  Technology
Inc.,  a  modem  chip  set  from  Rockwell  International  Corporation,   and  a
microprocessor from Motorola,  are currently available from only single sources.
Other  components of Castelle's  products are  currently  available  from only a
limited  number of sources.  In addition,  Castelle  subcontracts  a substantial
portion of its  manufacturing  to third  parties,  and there can be no assurance
that these subcontractors will be able to support the manufacturing requirements
of Castelle. Castelle does not have long-term supply contracts with these or any
other sole or limited source vendors and subcontractors  other than an agreement
with a Taiwanese  company,  and purchases  these  components on a purchase order
basis.  Castelle's  ability to obtain  these  components  or  sub-assemblies  is
dependent  upon its  ability  to  accurately  forecast  customer  demand for its
products and to anticipate  shortages of critical  components or  sub-assemblies
created by competing demands upon suppliers. If Castelle were unable to obtain a
sufficient supply of high-quality  components or sub-assemblies from its current
sources,  Castelle  could  experience  delays in obtaining  such  components  or
sub-assemblies  from other  sources.  Resulting  delays or reductions in product
shipments could adversely affect  Castelle's  business and operating results and
damage customer relationships.  Furthermore, a significant increase in the price
of one or more of these components or sub-assemblies or Castelle's  inability to
lower  component  or  sub-assembly  prices  in  response  to  competitive  price
reductions could adversely affect Castelle's operating results.

Proprietary Rights

     Castelle's success depends upon its technological expertise and proprietary
software  technology.  Castelle relies upon a combination of contractual  rights
and  copyright,  trademark  and trade secret laws to  establish  and protect its
technologies.  Additionally,  Castelle  generally  enters  into  confidentiality
agreements with those employees, distributors,  customers and suppliers who have

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access to sensitive  information  and limits access to and  distribution  of its
software documentation and other proprietary  information.  Because of the rapid
pace of technological change in the LAN product industry, Castelle believes that
patent  protection for its products is less  significant to its success than the
knowledge,  ability and experience of its employees,  the frequent  introduction
and  market  acceptance  of new  products  and  product  enhancements,  and  the
timeliness  and  quality of support  services  provided by  Castelle.  See "Risk
Factors -- Intellectual Property Risks."

     Despite  the  precautions  taken  by  Castelle,  it  may  be  possible  for
unauthorized third parties to copy certain portions of Castelle's products or to
reverse  engineer  or  obtain  and use  information  that  Castelle  regards  as
proprietary.  There can be no  assurance  that  Castelle's  precautions  will be
adequate  to  deter   misappropriation   or   infringement  of  its  proprietary
technologies.  Furthermore, while Castelle has obtained federal registration for
many of its trademarks in the United States,  certain of its trademarks have not
been  registered in the United States and Castelle has not registered any of its
trademarks in foreign  jurisdictions.  There can be no assurance that Castelle's
use of such  unregistered  trademarks  will not be contested by third parties in
the  future.  In  addition,  the laws of some  foreign  countries  either do not
protect Castelle's  proprietary rights or offer only limited  protection.  Given
the rapid evolution of technology and uncertainties in intellectual property law
in the  United  States  and  internationally,  there  can be no  assurance  that
Castelle's  current or future products will not be subject to third-party claims
of  infringement.  Any  litigation to determine the validity of any  third-party
claims could result in significant expense to Castelle and divert the efforts of
Castelle's technical and management personnel, whether or not such litigation is
determined in favor of Castelle.  In the event of an adverse  result in any such
litigation,  Castelle  could be  required  to expend  significant  resources  to
develop non-infringing  technology or to obtain licenses to the technology which
is the subject of the litigation.  There can be no assurance that Castelle would
be successful in such  development or that any such licenses would be available.
Castelle also relies on technology licenses from third parties.  There can be no
assurance  that these  licenses  will  continue to be available to Castelle upon
reasonable  terms,  if at all.  Any  impairment  or  termination  of  Castelle's
relationship with third-party  licensors could have a material adverse effect on
Castelle's business and operating results.

Government Regulation

     Certain aspects of the networking  industry in which Castelle  competes are
regulated  both in the United  States and in foreign  countries.  Imposition  of
public  carrier  tariffs,  taxation  of  telecommunications   services  and  the
necessity of incurring substantial costs and expenditure of managerial resources
to  obtain  regulatory  approvals,   particularly  in  foreign  countries  where
telecommunications  standards  differ  from  those in the United  States,  could
adversely affect  Castelle's  business and operating  results.  In addition,  if
Castelle is unable to obtain regulatory  approvals within a reasonable period of
time,  Castelle's  operating  results  could be adversely  affected.  Castelle's
products  must comply with a variety of equipment,  interface  and  installation
standards  promulgated  by  communications  regulatory  authorities in different
countries.  Changes in government policies,  regulations and interface standards
could  require the  redesign of products and result in product  shipment  delays
which could materially and adversely affect Castelle's operating results.

Employees

     As of  September  18,  1996,  Castelle  employed  a total  of 97  full-time
equivalent  personnel,  26 in  manufacturing,  29 in sales and marketing,  22 in
engineering,  9 in customer  service and 11 in finance  and  administration.  In
addition,  Castelle  employs people on a part-time or contract  basis.  Castelle
intends  to  continue  to hire  additional  personnel  in  connection  with  the

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expansion  of  its  operations.  Castelle  has  never  had a work  stoppage,  no
employees are  represented by a labor  organization  and Castelle  considers its
employee relations to be good.

         Castelle has entered into  confidentiality  agreements with each of its
employees  (including  its officers)  that prohibit  disclosure of  confidential
information  to anyone  outside  of  Castelle  both  during  and  subsequent  to
employment  and  require  disclosure  to  Castelle  of  ideas,   discoveries  or
inventions  relating to or resulting from the  employee's  work for Castelle and
assignment to Castelle of all proprietary  rights to such ideas,  discoveries or
inventions.

Properties

     Castelle's  headquarters,  including  its  executive  offices and corporate
administration,  development,  manufacturing,  marketing,  sales  and  technical
services/support  facilities,  are located in Santa  Clara,  California  with an
aggregate of approximately 21,400 square feet of floor space.  Castelle occupies
this  facility  under a lease,  the term of which  expires in October  2000.  In
addition,  Castelle rents office space for sales and customer support offices in
Florida, Illinois, Pennsylvania,  Germany and the Netherlands. Castelle believes
its  existing  facilities  will be  adequate  to meet its  requirements  for the
foreseeable future.

Legal Proceedings

     Castelle is not a party to any material  litigation and is not aware of any
pending or  threatened  litigation  against  Castelle that could have a material
adverse effect on Castelle's business, operating results or financial condition.

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                                BUSINESS OF IBEX

General

     Based on a 1996 study prepared by International  Data Corp.  (IDC), Ibex is
the leading supplier of fax-on-demand  software.  Ibex's fax-on-demand  product,
FactsLine, enables users to improve customer service and corporate communication
by sending out fax  documents  as  requested  by  telephone  or e-mail.  Selling
through both VARs and directly to end users,  Ibex's customers include corporate
users such as Delrina,  Pennzoil,  Microsoft and IBM, service  providers such as
MCI,  and  government  agencies.  Leveraging  its database  expertise,  document
management  technology  and fax  processing  capabilities,  Ibex is developing a
next-generation information-on-demand product which will enable users to quickly
and  seamlessly  respond to e-mail,  telephone  and faxed  document  requests by
sending out information via fax, e-mail or via the Internet.  Ibex is located in
El Dorado Hills, California and currently has 26 full-time equivalent personnel.

Industry Background

     Fax-on-demand is the ability to use a touch-tone phone and a fax machine to
request and receive information on demand.  Although there are a wide variety of
applications  installed,  the two most common  applications are customer support
and   literature   fulfillment   applications.   The  largest   industry   using
fax-on-demand is the high-technology sector, with applications also installed in
travel,  government,  newspapers,  manufacturing  and non-profit  organizations.
Essentially, any company with information to disseminate publicly is a potential
fax-on-demand customer.

     The growth of the  Internet  has  impacted  the way  businesses  manage and
distribute  information.  With the increased use of the Web, many  companies are
now looking at using both fax-on-demand and the Web for information  access. The
Web is used for  information  retrieval  by those with  Internet  access,  while
fax-on-demand is used by the large percentage of the population that do not have
Web access but do have access to a phone and a fax machine.


                          TECHNOLOGY USERS

                                 1995                 1999

Fax                          800 Million          800 Million

Email                         50 Million          100 Million

Web                           25 Million           75 Million


Source:  Fax data - Davidson Consulting

         Web and Email data - International Data Corporation

Ibex Strategy

     Ibex's strategy includes the following key elements:

     o    Maintain  and  Enhance  Technology  Leadership  Position.  Ibex  is  a
          recognized market and technology leader and has developed a high level

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          of expertise  in critical  areas such as document  delivery,  document
          management   and  fax   processing.   Ibex   expects  to  continue  to
          aggressively  invest in  development  activity to maintain and enhance
          its technology base.

     o    Provide  scalable  products  which address a broad  spectrum of users.
          Ibex's products are designed for high performance and scalability, yet
          are easy to use in regards to the basic  feature set. This allows Ibex
          to sell into two different distinct markets.

     o    Standard Level

          The standard product, targeted to small to medium sized companies will
          have fairly  basic  features and is limited in the number of telephone
          lines and the volume of messages supported.

     o    Service Provider / Enterprise Level

          Service  providers and larger companies will have more service related
          features such as billing  features,  open  programming  interfaces and
          will use  networked  modules  in order to  support  large  numbers  of
          simultaneous voice/fax/data users

     Leverage and Expand Existing VAR Channel.  Ibex has developed an attractive
world-wide  VAR  channel  over the past five years that  consists  of  resellers
capable of selling products in the $5-$20K range to high-level management.  Ibex
intends on  leveraging  the  existing  channel  while  continuing  to expand the
channel via shows, seminars, PR activities and advertising.

     Leverage  Customer Base.  Ibex has a strong  customer list with  technology
customers such as IBM, Microsoft,  Lotus,  Symantec,  Macromedia,  Dell, Compaq,
Ingram Micro,  Intuit and others.  Ibex also sells to mainstream  non-technology
customers  such as Coca-Cola,  Pacific  Bell,  Bank of Boston,  Bristol  Meyers,
Pennzoil, US Navy, the White House,  Burlington Northern Railway and others. [In
many  cases  it  is  the  same   decision-makers   that  purchased   their  Ibex
fax-on-demand   systems   that  are  also   involved   with  Web.]  Ibex  has  a
well-maintained  customer  database and intends to leverage the  installed  base
with the new product.  Existing  Ibex  fax-on-demand  systems will be able to be
used as the fax-on- demand component of Ibex's new Web/Email/fax  product,  thus
allowing a smooth upgrade path to this product.

Products

     Ibex  develops  and  markets a wide range of  fax-on-demand  products  that
enables a company's  information to be requested via telephone and delivered via
fax;  and  provides  a  variety  of  support   packages  to  maintain   customer
satisfaction.

     Ibex's  fax-on-demand  product  suite  consists  of  its  flagship  system,
FactsLine  for windows,  along with  optional  advanced  modules;  FactsLine for
Windows NT; RightFAX Edition; Fax-It-Back; Robofax- PRO; and Robofax-PRO Lite.

FactsLine for Windows

     Ibex's  Windows-based,   fax-on-demand   software  enables  the  access  of
information  via a phone and a fax  machine  and  allows  the  dissemination  of
information via  "broadcasting"  to a select  database of fax numbers.  With the

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addition of a number of  optional  advanced  modules  and  features--Intelligent
Menus,  Credit  Card,  Ibex  API,  Aspect  Integration,   FactsLine  for  Notes,
Transaction  Manager,  Fax  Description  Language,  FactsLine  for the Web, Ibex
OpenFax, and Fax Gateways--the  management and capabilities of the FactsLine for
Windows systems can be further optimized.

          Advanced Companion Modules/Features

          Intelligent  Menus:  expands the  branching  technique of FactsLine to
          include powerful logic and analysis capability.

          Credit Card: allows FactsLine to verify, authorize and charge caller's
          credit cards.

          Ibex Application  Programming  Interface (API):  enables  FactsLine to
          retrieve  information  from another computer and then fax or read back
          dynamic information to a caller.

          Aspect  Integration:  integrates  FactsLine  with  Aspect  to  provide
          powerful caller queuing,  intelligent  call routing and convenient fax
          retrieval functions.

          FactsLine for Notes:  merges  FactsLine  with the document  management
          capabilities of Lotus Notes.

          Transaction  Manager:  provides  sophisticated  management features to
          achieve  the  ultimate  performance  from  a  FactsLine  fax-on-demand
          system.

          Fax  Description  Language:  provides a scripting  language  that adds
          graphical interest to your faxable documents.

          FactsLine  for the Web: an add-on to Web servers,  which allows native
          Web documents to be used as fax-on-demand documents.

          Ibex OpenFax:  allows native Windows  applications  files on FactsLine
          fax-on-demand systems.

          Fax Gateway:  allows third party programs to send fax transactions via
          the intelligent Ibex fax engine.

FactsLine for Windows NT: RightFAX Edition

     Developed for the Windows NT platform,  the Right FAX Edition, is the first
fax-on-demand  system to tightly  integrate  with the  network  capabilities  of
RightFAX, to allow the fax-on-demand server and the network fax server to run on
one computer, while sharing the same fax hardware and phone lines.

Fax-It-Back

     Ibex's  entry-level  Windows 95  fax-on-demand  system,  currently  in Beta
testing,  was  specifically  designed for small- to mid-size  organizations  and
departmental  use and  provides a  professional  multi-line  (one to four lines)
system sturdy enough for production  fax-on-demand,  yet affordable and easy for
nontechnical staff to use.

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Robofax-PRO and Robofax-PRO Lite

     An entry-level  Windows-based  fax-on-demand system, soon to be replaced by
Fax-It-Back,   also  was  developed   for  small-  to  mid-size   organizations.
Robofax-PRO runs up to four lines  simultaneously,  while  Robofax-PRO Lite is a
one-line system.

     As a complement  to Ibex's  product line of enhanced  fax  solutions,  Ibex
offers a suite of support  packages  developed  to provide  flexible and helpful
support options on every product Ibex delivers.

Customer Support Packages

Ibex Rapid Response

     A support  program which provides  specific  services for 20% of the retail
price of the software purchased and targets a one hour response time.

Ibex Response

     A support  program which provides  specific  services for 15% of the retail
price of the software purchased and targets a three hour response time.

Ibex Access

     A support program which provides support on a pay-per-call basis only.

Products Under Development

     FactsLine  for NT. Ibex is currently  developing  support for the Microsoft
Windows NT operating system for almost all Ibex products. Since the Ibex product
line consists of numerous modules and added-cost  options,  complete support for
NT across the entire  product  line will not occur  until the second  quarter of
1997.  However,  many  modules are complete or are  currently at customer  sites
under beta  test.  A  substantial  portion  of the  product  line will ready for
delivery by the end of 1996.

     New  Product  Line.  Ibex is  developing  a new  product  which  will allow
companies  to use one source of  documents  in an Ibex  document  library and to
automatically publish the documents using the following methods:

     o    Fax-on-Demand
     o    Email-on-Demand
     o    Web Delivery

     Users can update one document,  and the information  will  automatically be
available via the Web, via  fax-on-demand,  or via an enhanced  auto-reply email
feature called Email-on-Demand. Web coding using HTML, Java, or CGI scripting is
not required.  Similarly, there is no fax-on-demand or mail-server configuration
needed when documents are added or deleted.

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     The new product allows cost effective,  automated and immediate information
retrieval using tools that everyone  understands.  A technically-savvy  consumer
can access a document using the Web. Another person can access the same document
via email if they choose.  Still  another  person,  perhaps not connected to the
Internet, can use their touch-tone phone to select the same document to be faxed
to their fax machine.

     The new  product  line  publishes  documents  automatically.  All  document
catalogs,  whether they be an interactive Web page, a fax-on-demand  index or an
email  index,  will be updated  whenever  the user adds,  changes,  or deletes a
document in the system.

     Email-on-demand.  Email-on-demand  is the  ability  to use email  (local or
Internet) to request and receive information on demand.  Auto-reply email exists
today, but is limited to receiving one document, usually in text format.

     The main benefits of email-on-demand are:

     o    Email via Internet is more prevalent than the Web

     o    Email-on-demand  can be done  on a  "batch"  basis.  Users  can  order
          documents,  which will be  delivered  to their email  inbox.  In other
          words,  there is no waiting to  download  documents  on the Web and no
          "surfing" to find documents.

     Web Delivery.  The product will automatically create and maintain Web sites
for users.  Navigation  pages with hot links,  and content pages with the actual
information  content  will be  automatically  created.  The new  product  brings
document  management,  version control and other management features to Web site
management.

     The Web site that this  product  creates is  intended  for  automatic  high
volume  management  and  delivery  of  documents  such  as  support  or  product
information.  It is not designed to create highly  graphical and interactive Web
pages,  although  the  automatically  created  pages can easily be linked to the
custom created pages.

     Product  Benefits.  This  new  product  line  will  also  introduce  a  new
"fax-it-to-me"  feature for Web and email users.  Thus, users of the product can
access the same source of document in the following ways:

     o    Download documents on World Wide Web direct to Web browser

     o    Select  documents  on Web, but choose to fax them (or forward them via
          fax)

     o    Select documents in email message, to be returned via email

     o    Select documents in email message, to be returned via fax

     o    Select  documents  via  telephone  keypad,  to  be  returned  via  fax
          (fax-on-demand)


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     Document-Centric.  Ibex's new  product  will be a document  warehouse  with
built-in  Web,  email  and fax  publishing.  Ibex  has been in the  business  of
publishing  documents,  and brings this  approach to the new product.  Companies
will use this document-centric  product to publish specification sheets, product
fact sheets, technical notes, financial information and other documents.

Competition

     Traditional  Fax-on-Demand  Vendors.  FaxBack,  Inc., Copia  International,
Spectrafax, and Nuntius among other smaller companies directly compete with Ibex
for fax-on-demand  business,  with FaxBack being the largest  competitor.  These
companies,  although each with a different  product offering and business model,
offer  fax-on-demand  systems that at least offer the basic functionality of the
Ibex product offering.  Ibex has been able to maintain a leadership  position by
offering  advanced  features such as Web/fax  products,  conversion  tools,  and
document management facilities.

     Fax-on-Demand  as Add-Ons to Other Products.  Some voice mail,  interactive
voice  response  and fax servers  have  fax-on-demand  as an added cost  option.
Octel, AVT, Omtool and Edify are examples of companies which offer fax-on-demand
as an option.

     Programmer  Toolkits.  Visual Basic voice response programmer toolkits such
as Stylus Innovation's Visual Voice and Technically  Speaking's Show-n-Tell also
compete indirectly with Ibex's products by providing programmer's tools that can
enable a programmer to build a basic fax-on-demand  system.  Stylus was recently
acquired by Artisoft  while  Technically  Speaking  was  recently  purchased  by
Brooktrout.

     As Ibex/Castelle  move into the Web and email areas, other competitors will
appear.  Currently,  there are no direct  competitors that provide an integrated
fax/email/Web information delivery system as envisioned by the new product line,
although many competitors exist that perform Web delivery of information.

Research and Development

     Most of Ibex's  research and  development  expenses are related to software
development.  Ibex believes that its continued  success will depend in part upon
its ability to enhance its existing products, introduce new products on a timely
basis, maintain compatibility with new releases of network operating systems and
other  relevant  software  and  continue  to  develop  technology  that  can  be
incorporated  into  products  that meet  changing  end-user  requirements.  Ibex
intends to leverage its proprietary  technology and industry  expertise into new
product   offerings  that  it  believes  will  further  enhance  network  users'
productivity.

     To facilitate product  development,  Ibex works closely with its end-users,
VARs,  distributors  and strategic  partners to identify market needs and define
product  specifications  early in the development  process.  In order to develop
products  successfully,  Ibex is dependent on timely access to information about
new  developments in the  marketplace.  There can be no assurance that Ibex will
have such  access or that it will be able to develop new  products  successfully
and respond effectively to technological change or new product  announcements by
competitors.


                                       79

<PAGE>



Sales, Marketing and Distribution

     Value-Added  Resellers.  Ibex sells to end-users  primarily  through  value
added  resellers  via the Ibex  Marketing  Partner  program.  The  typical  Ibex
marketing  partner has experience in selling high-end products costing $5-10,000
with a medium to long sales cycle and a consultative  sales approach.  Since the
typical  customer  for  fax-on-demand  is the  sales/marketing  MIS and customer
support  management,  the current marketing partner is already familiar with the
same potential customer for Internet/Web products. This is in direct contrast to
the typical  computer  oriented VAR who is experienced only in short sales cycle
products  costing  under  $5,000.  Many of Ibex's  VARs  specialize  in  selling
computer fax software and already sell complementary software such as fax server
(often selling a competing  system to Castelle),  fax  enhancement for fax-forms
software.

     Ibex recruits VARs via shows,  advertisements  in industry  magazines,  and
seminars.  For  example,  Ibex has  developed  a seminar  program  that is being
presented at approximately 10 locations in 1996.

     Direct  Sales.  Ibex also  sells  direct  to  service  providers,  national
accounts and strategic accounts. Service providers, also called service bureaus,
base a service on Ibex  products.  Whereas an end-user  may install a four to 24
port  fax-on-demand  system,  the service provider may install systems with over
100 ports, and at the same time demand more functionality and features.

     The Web/Internet  market mirrors the fax-on-demand  market quite closely in
regards  to service  bureaus.  Approximately  50% of the Web sites are  actually
maintained by a third party service  provider.  Ibex currently has fax-on-demand
service  providers   installing  Web  servers  and  Internet  service  providers
installing  fax-on-demand systems. Each type of service provider wishes to offer
their  customers the widest range of services,  which means  offering Web or fax
access if they do not have it.

     Demand  for  Ibex's  products  is  created  through   targeted  and  active
participation in industry  networking and communication  trade shows, as well as
advertising in associated publications. Ibex also increases awareness of Company
products through advertising,  generating client leads,  instituting direct mail
campaigns,  sending  Company  newsletters,  offering  seminars,  trade shows and
conferences  and  other  forms of public  relations  efforts.  Ibex's  sales and
marketing  efforts are enhanced by a specific program designed to encourage VARs
and other  resellers  to promote and sell Ibex's  products.  Such  promotion  is
encouraged by providing  participants in the program with technical support on a
priority basis,  product literature,  on-site sales and support training,  sales
leads, free software upgrades, and other forms of sales promotions.  In addition
to its other activities, Ibex's marketing staff employs various research methods
and gathers  information  from many  sources  such as VARS and other  resellers,
customers,   distribution  partners,  OEM  partners,   strategic  partners,  and
press/publication groups. Product development, sales and client services/support
personnel benefit from the information gathered in planning future products.

     Ibex's two largest  customers,  Ibex Europe and Ibex  Canada,  cumulatively
accounted for 31% of net sales in the first six months of 1996, 15% of net sales
in 1995 and 15% of net sales in 1994.  Ibex Europe is an  exclusive  distributor
for Europe while Ibex Canada has an exclusive agent  agreement for Canada.  Both
of these companies sell only Ibex products or products such as voice boards, fax
boards  or  services  that  enhance  Ibex  products.  These  companies  are  not
contractually  committed to future purchases and their lack of market success or
their  inability  to  satisfy  their  payment  obligations  to Ibex could have a
significant adverse effect on Ibex's business and operating results.


                                       80

<PAGE>



Proprietary Rights

     Ibex's success  depends upon its  technological  expertise and  proprietary
software  technology.  Ibex relies upon a combination of contractual  rights and
copyright,  trademark  and  trade  secret  laws to  establish  and  protect  its
technologies.   Additionally,   Ibex  generally   enters  into   confidentiality
agreements with those employees, distributors,  customers and suppliers who have
access to sensitive  information  and limits access to and  distribution  of its
software   documentation   and   other   proprietary   information.   See  "Risk
Factors-Intellectual Property Risks."

     Despite the precautions  taken by Ibex, it may be possible for unauthorized
third parties to copy certain portions of Ibex's products or to reverse engineer
or obtain and use information that Ibex regards as proprietary.  There can be no
assurance that Ibex's precautions will be adequate to deter  misappropriation or
infringement  of its  proprietary  technologies.  Furthermore,  while  Ibex  has
obtained  federal  registration for many of its trademarks in the United States,
certain of its trademarks have not been registered in the United States and Ibex
has not registered any of its trademarks in foreign jurisdictions.  There can be
no  assurance  that  Ibex's  use of such  unregistered  trademarks  will  not be
contested by third parties in the future. In addition,  the laws of some foreign
countries either do not protect Ibex's  proprietary rights or offer only limited
protection.  Given  the rapid  evolution  of  technology  and  uncertainties  in
intellectual property law in the United States and internationally, there can be
no  assurance  that  Ibex's  current or future  products  will not be subject to
third-party claims of infringement.  Any litigation to determine the validity of
any  third-party  claims could result in significant  expense to Ibex and divert
the efforts of Ibex's  technical and management  personnel,  whether or not such
litigation is determined in favor of Ibex. In the event of an adverse  result in
any such litigation,  Ibex could be required to expend significant  resources to
develop non-infringing  technology or to obtain licenses to the technology which
is the subject of the  litigation.  There can be no assurance that Ibex would be
successful in such  development  or that any such  licenses  would be available.
Ibex also relies on  technology  licenses  from third  parties.  There can be no
assurance  that  these  licenses  will  continue  to be  available  to Ibex upon
reasonable   terms,   if  at  all.  Any  impairment  or  termination  of  Ibex's
relationship with third-party  licensors could have a material adverse effect on
Ibex's business and operating results.

Government Regulation

     Certain  aspects of the industry in which Ibex competes are regulated  both
in the United  States and in foreign  countries.  Imposition  of public  carrier
tariffs, taxation of telecommunications  services and the necessity of incurring
substantial  costs and expenditure of managerial  resources to obtain regulatory
approvals,  particularly  in foreign  countries  could  adversely  affect Ibex's
business and operating results. Changes in government policies,  regulations and
interface standards could require the redesign of products and result in product
shipment  delays which could  materially and adversely  affect Ibex's  operating
results.

Employees

     As of September 18, 1996, Ibex employed a total of 26 full-time  equivalent
personnel, 1 in operations,  11 in sales and marketing,  7 in engineering,  3 in
customer service and 4 in finance and administration.  In addition, Ibex employs
people on a part-time or contract basis. Ibex has never had a work stoppage,  no
employees  are  represented  by a labor  organization  and  Ibex  considers  its
employee relations to be good.


                                       81

<PAGE>



     Ibex has entered into confidentiality agreements with each of its employees
(including its officers) that prohibit disclosure of confidential information to
anyone  outside of Ibex both during and  subsequent  to  employment  and require
disclosure to Ibex of ideas,  discoveries or inventions relating to or resulting
from the  employee's  work for Ibex and  assignment  to Ibex of all  proprietary
rights to such ideas, discoveries or inventions.

Properties

     Ibex's   headquarters,   including  its  executive  offices  and  corporate
administration,  development,  manufacturing,  marketing,  sales  and  technical
services/support  facilities, are located in El Dorado Hills, California with an
aggregate of approximately  5,200 square feet of floor space. Ibex occupies this
facility under a lease, the term of which expires in the year 2000. In addition,
Ibex rents office space for sales and customer  support  offices in Mill Valley.
Ibex believes its existing  facilities will be adequate to meet its requirements
for the foreseeable future.

Legal Proceedings

     Ibex is not a party  to any  material  litigation  and is not  aware of any
pending or threatened litigation against Ibex that could have a material adverse
effect on Ibex's business, operating results or financial condition. See "Recent
Developments -- Litigation."


                                       82

<PAGE>

<TABLE>
<CAPTION>


                             MANAGEMENT OF CASTELLE

     The  executive  officers  and  directors  and certain  other  employees  of
Castelle are as follows:

                NAME                     AGE                               PRINCIPAL OCCUPATION/
                                                                        POSITION HELD WITH CASTELLE

<S>                                         <C>                                                                   
Arthur H. Bruno                             62           Chairman of the Board, Chief Executive Officer, President
                                                         and Director
Jerome J. Burke                             55           Executive Vice President
Randall I. Bambrough                        41           Chief Financial Officer, Vice President of Finance and
                                                         Administration and Secretary
Ariel Bialik                                46           Director of Software Development
John Freidenrich (1)                        59           General Partner, Bay Management Company
William T. Hambrecht (3)                    61           Chairman of Hambrecht & Quist Group
Alan Kessman (2)                            50           Chairman of the Board, President and Chief Executive
                                                         Officer of Executone Information Systems, Inc.
Donald Masulis                              47           Director of Technology
Kanwal S. Rekhi (1)                         49           Director
Delbert W. Yocam (2)                        52           Director

- ---------------
</TABLE>

(1)  Member of Compensation Committee of the Board of Directors.
(2)  Member of Audit Committee of the Board of Directors.
(3)  Hambrecht & Quist Group maintains a policy that persons acting as directors
     for private  companies  withdraw from such  positions,  within a reasonable
     time after the company becomes publicly traded. Accordingly,  Mr. Hambrecht
     has  indicated  that he does not wish to be  nominated  for  reelection  to
     Castelle's  Board of  Directors  and will  cease  to be a  director  of the
     Company upon the conclusion of the Castelle Meeting.

     Arthur H. Bruno has served as Castelle's Chairman,  Chief Executive Officer
and President  since October 1993.  From 1991 to 1993, he was Chairman and Chief
Executive Officer of White Pine Software Inc., a desktop  connectivity  company.
From 1989 to 1991, he was the Chairman and Chief  Executive  Officer of Wellsley
Medical Management  Corporation,  a primary care medical service provider.  From
1986 to  1989,  he was the  Chairman  and  Chief  Executive  Officer  of  Visual
Technology  Incorporated,  the predecessor to White Pine Software Inc. Mr. Bruno
is also a director of several privately-held companies.

     Jerome J. Burke joined Castelle and has served as Castelle's Executive Vice
President  since December 1993.  From 1988 through  November 1993, Mr. Burke was
Executive  Vice President of Sales and Marketing of White Pine Software Inc. and
its predecessor, Visual Technology Incorporated.

     Randall  I.  Bambrough  joined  Castelle  in June 1992 and was named to his
current positions in August 1995. From October 1990 until joining Castelle,  Mr.
Bambrough was a  self-employed  financial  consultant.  Prior to that time,  Mr.
Bambrough was employed by Daisy Systems,  Inc., an electronic  design automation
software company, in various financial management positions.

                                       83

<PAGE>



     Ariel  Bialik  joined  Castelle  in January  1990 as  Manager  of  Software
Engineering and has served since 1993 as Director of Software Development. While
at  Castelle,  Mr.  Bialik has  managed all  software  product  development  and
maintenance  activities and assisted in establishing the technology direction of
Castelle.  Prior to joining  Castelle,  Mr. Bialik was a member of the technical
staff at Daisy  Systems,  Inc.  Mr.  Bialik holds a B.Sc.  degree in  Electrical
Engineering from the Technion Israel Institute of Technology.

     John  Freidenrich  has served as a director of Castelle since January 1994.
Since 1981, he has been a general partner of various entities established by Bay
Partners,  a venture  capital  group.  Currently,  Mr.  Freidenrich is a general
partner of Bay  Management  and Bay  Management  Company IV,  L.P.,  the general
partner of Bay Partners III, L.P. and Bay Partners IV, L.P.,  respectively.  Mr.
Freidenrich  was also a partner  in, or of  counsel  to, the law firms of Ware &
Freidenrich or Gray, Cary, Ware & Freidenrich from January 1987 through December
1991.

     Alan Kessman has served as a director of Castelle  since April 1992. He has
also served as Chairman of the Board, President,  and Chief Executive Officer of
Executone Information Systems, Inc., a telecommunications  company, since August
1983.

     Donald Masulis, a founder of Castelle, has served as Director of Technology
since October 1993. Mr. Masulis is responsible  for the software  development of
various  versions of the FaxPress and LANpress  products and directs  Castelle's
product quality assurance program.  Mr. Masulis holds a Master of Science degree
in  Industrial  Engineering  and  Operations  Research  from the  University  of
California  at Berkeley  and a Bachelor  of Science  degree in  Information  and
Computer Science from the University of California at Irvine.

     Kanwal S. Rekhi has served as a director  of  Castelle  since  April  1995.
Currently retired,  Mr. Rekhi served as Executive Vice President of Novell, Inc.
from June 1989  through  January  1995.  Mr.  Rekhi also served as a director of
Novell,  Inc.  from June 1989  through  August  1995 and as a director  of Gupta
Corporation from June 1990 through September 1996.

     Delbert W. Yocam has been a director  of Castelle  since  April  1995.  Mr.
Yocam has been an independent  consultant from November 1994 to the present. Mr.
Yocam was President,  Chief Operating Officer and a director of Tektronix,  Inc.
from September 1992 through November 1994. He was an independent consultant from
November 1989 until September 1992. Mr. Yocam was with Apple Computer, Inc. from
November  1979  through  November  1989,  serving  in  a  variety  of  executive
management positions, including Chief Operating Officer from August 1986 through
August 1988 and  President of Apple  Pacific from August 1988 to November  1989.
Mr.  Yocam is also a director of Adobe  Systems,  Inc.,  Integrated  Measurement
Systems, Inc., Oracle Corporation, Sapiens International Corp., Xircom, Inc. and
several privately-held technology companies.

Directors Not Standing For Re-Election

     Hambrecht & Quist Group maintains a policy that persons acting as directors
for private  companies  withdraw from such  positions,  within a reasonable time
after the company  becomes  publicly  traded.  Accordingly,  Mr.  Hambrecht  has
indicated  that he does not wish to be nominated  for  reelection  to Castelle's
Board of  Directors  and will cease to be a  director  of the  Company  upon the
conclusion of the Castelle Meeting.


                                       84

<PAGE>



     William R.  Hambrecht  has been a director  of  Castelle  since  1988.  Mr.
Hambrecht is Chairman of Hambrecht & Quist Group and its  principal  subsidiary,
Hambrecht & Quist LLC. He has been a Director of RvR Securities  Corp., a wholly
owned subsidiary of Hambrecht & Quist Group, since its inception in 1993. He has
continuously  served as an officer,  director or principal of those  entities or
their  predecessors  since he and the late George Quist  co-founded  Hambrecht &
Quist in 1968.  Mr.  Hambrecht  also serves on the Board of  Directors  of Adobe
Systems,  Inc.  and Vanguard  Airlines.  He holds a B.A.  degree from  Princeton
University.

Compensation of Executive Officers

     The following  table shows for the fiscal years ended December 31, 1994 and
1995,  compensation awarded or paid to, or earned by, Castelle's Chief Executive
Officer and its other  executive  officer  whose total  annual  salary and bonus
exceeded $100,000 (the "Named Executive Officers"):

                           SUMMARY COMPENSATION TABLE
<TABLE>
<CAPTION>


                                                                            Annual
                                                                         Compensation
                                               -------------------------------------------------------------------------------
                                                                                                 Other
      Name and Principal                            Salary               Bonus                  Annual              Long-Term
           Position                 Year             ($)                 ($)                Compensation($)       Compensation
- -------------------------------   -------      -----------------   -----------------        ---------------       ------------

<S>                                 <C>                 <C>                   <C>                                         
Arthur H. Bruno,                    1995                180,000               7,500               --                    --
Chairman of the Board,              1994                180,000                 -0-               --                    --
President, Chief Executive
Officer and Director

Jerome J. Burke                     1995                117,385              60,909               --                    --
Executive Vice President            1994                120,000              26,559(1)            --                    --

</TABLE>

(1)  Represents sales commissions paid by the Company for sales made in 1994.

Compensation of Directors

     Other than Mr.  Yocam,  Castelle's  directors  currently do not receive any
cash  compensation  for  service  on the  Board of  Directors  or any  committee
thereof, but directors may be reimbursed for certain expenses in connection with
attendance at Board and committee meetings.  Mr. Yocam receives $7,500 quarterly
and $1,000 cash compensation for each Board of Directors meeting he attends.  In
the  fiscal  year  ended  December  31,  1995,  the total  compensation  paid to
non-employee directors was $33,000.

     In April 1995,  each of Mr. Yocam and Mr. Rekhi was granted an option under
the 1988 Incentive  Stock Option Plan to purchase  27,900 shares of Common Stock
at an exercise price of $5.00 per share.

     In November 1995, the Board adopted the 1995 Non-Employee  Directors' Stock
Option  Plan (the  "Directors'  Plan") to  provide  for the  automatic  grant of
options to purchase shares of Common Stock to eligible non-employee directors of
Castelle.  Each director of Castelle who is not  otherwise  employed by Castelle
(or an affiliate of Castelle) is an eligible director under the Directors' Plan.
The Directors'  Plan is  administered  by the Board,  unless the Board delegates
administration to a committee of at least two members of the Board.


                                       85

<PAGE>



     The maximum number of shares of Common Stock that may be issued pursuant to
options granted under the Directors'  Plan is 120,000.  Pursuant to the terms of
the  Directors'  Plan,  each  eligible  director of Castelle who first joins the
Board after the date of this Prospectus  automatically will be granted an option
to  purchase  5,000  shares of Common  Stock upon the date of his or her initial
election  to the  Board.  In  addition,  on the first day of April of each year,
commencing  on  April  1,  1996,  each  eligible  director   (including  current
non-employee  directors of Castelle who are eligible  directors) will be granted
an option to purchase 2,000 shares of Common Stock.

     No option  granted  under the  Directors'  Plan may be exercised  after the
expiration of ten years from the date it was granted.  Options granted under the
Directors' Plan will vest in equal monthly  installments over two years from the
date  of  grant.  In the  event  of any  merger,  consolidation  or  liquidation
involving Castelle, vesting of all outstanding options will be accelerated.  The
exercise price of options  granted under the Directors'  Plan will equal 100% of
the fair market value of the Common Stock on the date of grant.  Options granted
under the Directors' Plan are generally non-transferable.

     During the last  fiscal  year,  Castelle  did not grant  options  under the
Directors' Plan.

                                       86

<PAGE>



                   DESCRIPTION OF CASTELLE COMPENSATION PLANS

     On April 29, 1988,  Castelle  adopted its 1988 Equity  Incentive Plan which
was most  recently  amended on November 15, 1995.  On November 15, 1995 Castelle
adopted its 1995  Non-Employee  Directors'  Stock  Option  Plan.  The  essential
features of each of these plans are outlined below.

                           1988 EQUITY INCENTIVE PLAN

General

     The 1988 Equity  Incentive  Plan (the  "Incentive  Plan")  provides for the
grant or issuance of incentive stock options to employees and nonstatutory stock
options,  restricted  stock purchase  awards,  and stock bonuses to consultants,
employees and  directors.  To date only incentive  stock  options,  nonstatutory
stock options and restricted  stock awards have been awarded under the Incentive
Plan.  Incentive  stock options granted under the Incentive Plan are intended to
qualify as "incentive  stock  options"  within the meaning of Section 422 of the
Internal  Revenue Code of 1986,  as amended  (the  "Code").  Nonstatutory  stock
options  granted  under  the  Incentive  Plan are  intended  not to  qualify  as
incentive stock options under the Code. See "Federal Income Tax Information" for
a  discussion  of the  tax  treatment  of the  various  awards  included  in the
Incentive Plan.

Purpose

     The  Incentive  Plan was  adopted  to  provide  a means  by which  selected
officers and employees of and  consultants to Castelle and its affiliates  could
be given an opportunity to receive stock in Castelle, to assist in retaining the
services of employees  holding key positions,  to secure and retain the services
of persons capable of filling such positions and to provide  incentives for such
persons to exert maximum efforts for the success of Castelle.

Administration

     The Incentive Plan is  administered  by the Board of Directors of Castelle.
The  Board has the power to  construe  and  interpret  the  Incentive  Plan and,
subject to the  provisions  of the  Incentive  Plan, to determine the persons to
whom and the dates on which  awards will be granted,  what type of award will be
granted,  the number of shares to be subject  to each  award,  the time or times
during the term of each award within which all or a portion of such award may be
exercised,  the exercise price, the type of consideration and other terms of the
award.  The Board of Directors is authorized to delegate  administration  of the
Incentive  Plan to a  committee  composed  of not fewer than two  members of the
Board.  The Board has  delegated  administration  of the  Incentive  Plan to the
Compensation  Committee  of the  Board.  As  used  herein  with  respect  to the
Incentive Plan, the "Board" refers to the  Compensation  Committee as well as to
the Board of Directors itself.

Eligibility

     Incentive  stock options may be granted  under the  Incentive  Plan only to
selected key  employees  (including  officers)  of Castelle and its  affiliates.
Consultants  and selected key  employees  (including  officers)  are eligible to
receive  awards other than  incentive  stock options  under the Incentive  Plan.
Directors who are not salaried employees of or consultants to Castelle or to any
affiliate of Castelle are not eligible to  participate  in the  Incentive  Plan.
Approximately  78 of  Castelle's 97 employees  and  consultants  are eligible to
participate in the Incentive Plan.

                                       87

<PAGE>




     No incentive  stock option may be granted under the  Incentive  Plan to any
person  who,  at the  time of the  grant,  owns  (or is  deemed  to  own)  stock
possessing  more than 10% of the total combined  voting power of Castelle or any
affiliate  of Castelle,  unless the exercise  price is at least 110% of the fair
market value of the stock subject to the  incentive  stock option on the date of
grant,  and the term of the option  does not exceed  five years from the date of
grant.  For incentive  stock  options  granted  under the  Incentive  Plan,  the
aggregate fair market value,  determined at the time of grant,  of the shares of
Common Stock with respect to which such  options are  exercisable  for the first
time by an optionee  during any calendar  year (under all such plans of Castelle
and its affiliates) may not exceed $100,000.

Stock Subject to the Incentive Plan

     If awards  granted under the Incentive  Plan expire or otherwise  terminate
without being exercised,  the Common Stock not purchased pursuant to such awards
again becomes available for issuance under the Incentive Plan.

Terms of Options

     The following is a description  of the  permissible  terms of options under
the Incentive Plan.  Individual  option grants may be more restrictive as to any
or all of the permissible terms described below.

     Exercise  Price;  Payment.  The exercise price of an incentive stock option
under  the  Incentive  Plan may not be less  than the fair  market  value of the
Common Stock subject to the option on the date of the option grant,  and in some
cases (see  "Eligibility"  above), may not be less than 110% of such fair market
value.  The exercise price of nonstatutory  options under the Incentive Plan may
not be less than 85% of such fair market  value.  At  September  30,  1996,  the
closing price of Castelle's  Common Stock as reported on the Nasdaq Stock Market
National Market was $6.875 per share.

     In the event of a decline  in the value of  Castelle's  Common  Stock,  the
Board  has  the  authority  to  offer   employees  the  opportunity  to  replace
outstanding higher priced options,  whether incentive or nonstatutory,  with new
lower priced options.  The Board also has the authority to include as part of an
option  agreement a provision  entitling the optionee to a further option in the
event that the optionee exercises his or her option by surrendering other shares
of Common Stock as payment of the exercise price.

     The exercise price of options granted under the Incentive Plan must be paid
either: (a) in cash at the time the option is exercised; or (b) as determined by
the  Board at the time of  grant,  (i) by  delivery  of  other  Common  Stock of
Castelle,  (ii) pursuant to a deferred  payment  arrangement or (c) in any other
form of legal consideration acceptable to the Board.

     Option  Exercise.  Options  granted  under the  Incentive  Plan may  become
exercisable in cumulative increments ("vest") as determined by the Board. Shares
covered by currently outstanding options under the Incentive Plan typically vest
at the rate of 25% on the first  anniversary  of the  vesting  date and  monthly
vesting (at a cumulative rate of 25% per year) thereafter  during the optionee's
employment or services as a consultant. Shares covered by options granted in the
future under the Incentive Plan may be subject to different  vesting terms.  The
Board  has the  power to  accelerate  the time  during  which an  option  may be
exercised.  In addition,  options  granted under the  Incentive  Plan may permit
exercise  prior to vesting,  but in such event the  optionee  may be required to
enter into an early exercise stock  purchase  agreement that allows  Castelle to
repurchase  shares not yet vested at their  exercise  price  should the optionee
leave the employ of  Castelle  before such  shares  have  vested.  To the extent
provided by the terms of an option,  an optionee may satisfy any federal,  state

                                       88
<PAGE>

or local tax withholding obligation relating to the exercise of such option by a
cash payment upon exercise, by authorizing Castelle to withhold a portion of the
stock otherwise issuable to the optionee,  by delivering  already-owned stock of
Castelle or by a combination of these means.

     Term.  The maximum term of options under the  Incentive  Plan is ten years,
except that in certain cases (see "Eligibility") the maximum term is five years.
Options  under the  Incentive  Plan  terminate  three  months after the optionee
ceases to be employed by Castelle or any  affiliate of Castelle,  unless (a) the
termination of employment is due to such person's permanent and total disability
(as defined in the Code),  in which case the option may,  but need not,  provide
that it may be  exercised at any time within one year of such  termination;  (b)
the optionee dies while  employed by Castelle or any  affiliate of Castelle,  or
within three  months after  termination  of such  employment,  in which case the
option may, but need not,  provide  that it may be exercised  (to the extent the
option was  exercisable  at the time of the  optionee's  death) within  eighteen
months of the  optionee's  death by the  person or persons to whom the rights to
such option pass by will or by the laws of descent and distribution;  or (c) the
option by its terms specifically provides otherwise. Individual options by their
terms  may  provide  for  exercise  within a longer  or  shorter  period of time
following termination of employment or the consulting  relationship.  The option
term may also be extended in the event that  exercise of the option within these
periods is prohibited for specified reasons.

Terms of Stock Bonuses and Purchases of Restricted Stock

     Purchase  Price;  Payment.  The  purchase  price under each stock  purchase
agreement will be determined by the Board.  The purchase price of stock pursuant
to a stock purchase  agreement  must be paid either:  (i) in cash at the time of
purchase;  (ii) at the discretion of the Board,  according to a deferred payment
or other  arrangement with the person to whom the Common Stock is sold; or (iii)
in any other form of legal  consideration that may be acceptable to the Board in
its discretion.  Eligible  participants may be awarded stock pursuant to a stock
bonus agreement in consideration of past services  actually rendered to Castelle
or for its benefit.

     Repurchase.  Shares of the Common Stock sold or awarded under the Incentive
Plan may, but need not, be subject to a  repurchase  option in favor of Castelle
in accordance  with a vesting  schedule  determined by the Board. In the event a
person  ceases  to be an  employee  of or ceases  to serve as a  director  of or
consultant to Castelle or an affiliate of Castelle,  Castelle may  repurchase or
otherwise  reacquire  any or all of the shares of the Common  Stock held by that
person that have not vested as of the date of termination under the terms of the
stock bonus or restricted  stock purchase  agreement  between  Castelle and such
person.

Adjustment Provisions

     If there is any  change  in the  stock  subject  to the  Incentive  Plan or
subject to any award  granted  under the  Incentive  Plan without the receipt of
consideration (through merger, consolidation, reorganization,  recapitalization,
stock dividend,  dividend in property other than cash, stock split,  liquidating
dividend,  combination  of  shares,  exchange  of  shares,  change in  corporate
structure or otherwise),  the Incentive Plan and awards  outstanding  thereunder
will be appropriately  adjusted as to the class and the maximum number of shares
subject  to such plan and the  class,  number  of shares  and price per share of
stock subject to such outstanding awards.


                                       89

<PAGE>



Effect of Certain Corporate Events

     The  Incentive  Plan  provides  that,  in the  event  of a  dissolution  or
liquidation  of  Castelle,   specified   type  of  merger  or  other   corporate
reorganization,  to the extent permitted by law, any surviving  corporation will
be required to either assume  awards  outstanding  under the  Incentive  Plan or
substitute  similar  awards  for those  outstanding  under  such  plan,  or such
outstanding awards will continue in full force and effect. In the event that any
surviving  corporation  declines to assume or continue awards  outstanding under
the Incentive Plan, or to substitute similar awards,  then the time during which
such awards may be exercised  will be accelerated  and the awards  terminated if
not exercised  during such time. The acceleration of an award in the event of an
acquisition  or  similar  corporate  event  may be  viewed  as an  anti-takeover
provision,  which may have the effect of  discouraging  a proposal to acquire or
otherwise obtain control of Castelle.

Duration, Amendment and Termination

     The Board may suspend or terminate the Incentive  Plan without  stockholder
approval  or  ratification  at any  time or from  time to  time.  Unless  sooner
terminated, the Incentive Plan will terminate on November 14, 2005.

     The Board may also  amend  the  Incentive  Plan at any time or from time to
time.   However,   no  amendment  will  be  effective  unless  approved  by  the
stockholders  of Castelle  within  twelve months before or after its adoption by
the Board if the amendment  would: (a) modify the requirements as to eligibility
for participation (to the extent such modification requires stockholder approval
in order for the Plan to satisfy Section 422 of the Code, if applicable, or Rule
16b-3 ("Rule  16b-3") of the  Securities  Exchange Act of 1934,  as amended (the
"Exchange  Act"));  (b) increase the number of shares reserved for issuance upon
exercise of options;  or (c) change any other provision of the Plan in any other
way if such modification  requires  stockholder approval in order to comply with
Rule 16b-3 or satisfy the requirements of Section 422 of the Code. The Board may
submit any other  amendment  to the  Incentive  Plan for  stockholder  approval,
including,  but not limited to, amendments  intended to satisfy the requirements
of Section  162(m) of the Code  regarding  the  exclusion  of  performance-based
compensation  from the limitation on the  deductibility of compensation  paid to
certain employees.

Restrictions on Transfer

     Under the Incentive  Plan, an incentive stock option may not be transferred
by  the  optionee  otherwise  than  by  will  or by  the  laws  of  descent  and
distribution and, during the lifetime of an optionee, an option may be exercised
only by the optionee.  A nonstatutory stock option may not be transferred except
by will or by the laws of descent and  distribution  or pursuant to a "qualified
domestic  relations  order." In any case, an optionee may designate in writing a
third party who may exercise the option in the event of the optionee's death. No
rights  under  a  stock  bonus  or  restricted  stock  purchase   agreement  are
transferable  except by will, by the laws of descent and distribution,  pursuant
to a "qualified domestic relations order" or where required by law. In addition,
any shares  subject to  repurchase  by Castelle  under an early  exercise  stock
purchase  agreement may be subject to  restrictions  on transfer which the Board
deems appropriate.

Federal Income Tax Information

     Incentive  Stock Options.  Incentive stock options under the Incentive Plan
are  intended to be eligible  for the  favorable  federal  income tax  treatment
accorded "incentive stock options" under the Code.


                                       90

<PAGE>




     There  generally are no federal income tax  consequences to the optionee or
Castelle  by reason of the  grant or  exercise  of an  incentive  stock  option.
However,  the exercise of an incentive  stock option may increase the optionee's
alternative minimum tax liability, if any.

     If an optionee holds stock acquired  through exercise of an incentive stock
option for at least two years  from the date on which the option is granted  and
at least one year  from the date on which  the  shares  are  transferred  to the
optionee upon exercise of the option,  any gain or loss on a disposition of such
stock  will be  long-term  capital  gain or  loss.  Generally,  if the  optionee
disposes of the stock before the  expiration of either of these holding  periods
(a "disqualifying  disposition"),  at the time of disposition, the optionee will
realize  taxable  ordinary  income  equal to the lesser of (a) the excess of the
stock's fair market value on the date of exercise  over the exercise  price,  or
(b) the optionee's actual gain, if any, on the purchase and sale. The optionee's
additional  gain,  or any loss,  upon the  disqualifying  disposition  will be a
capital gain or loss, which will be long-term or short-term depending on whether
the stock was held for more than one year. Capital gains currently are generally
subject to lower tax rates than ordinary income.  The maximum  long-term capital
gains rate for federal  income tax purposes is  currently  28% while the maximum
ordinary  income  rate  is  effectively  39.6%  at the  present  time.  Slightly
different  rules may apply to  optionees  who acquire  stock  subject to certain
repurchase options or who are subject to Section 16(b) of the Exchange Act.

     To the  extent  the  optionee  recognizes  ordinary  income  by reason of a
disqualifying  disposition,  Castelle will generally be entitled (subject to the
requirement  of   reasonableness   and  the  satisfaction  of  a  tax  reporting
obligation) to a  corresponding  business  expense  deduction in the tax year in
which the disqualifying disposition occurs.

     Nonstatutory  Stock Options.  Nonstatutory  stock options granted under the
Incentive Plan generally have the following federal income tax consequences:

     There are no tax  consequences to the optionee or Castelle by reason of the
grant of a  nonstatutory  stock option.  Upon exercise of a  nonstatutory  stock
option,  the optionee  normally will recognize  taxable ordinary income equal to
the excess of the  stock's  fair market  value on the date of exercise  over the
option  exercise  price.  Generally,  with  respect to  employees,  Castelle  is
required to withhold from regular wages or supplemental  wage payments an amount
based  on  the  ordinary  income  recognized.  Subject  to  the  requirement  of
reasonableness  and the  satisfaction of a reporting  obligation,  Castelle will
generally  be  entitled  to a business  expense  deduction  equal to the taxable
ordinary income  realized by the optionee.  Upon  disposition of the stock,  the
optionee will recognize a capital gain or loss equal to the  difference  between
the selling  price and the sum of the amount paid for such stock plus any amount
recognized  as ordinary  income upon  exercise of the option.  Such gain or loss
will be long or short-term depending on whether the stock was held for more than
one year.  Slightly  different  rules may apply to optionees  who acquire  stock
subject to certain repurchase options or who are subject to Section 16(b) of the
Exchange Act.

     Restricted  Stock and Stock  Bonuses.  Restricted  stock and stock  bonuses
granted under the Incentive Plan generally have the following federal income tax
consequences:

     Upon  acquisition  of stock under a restricted  stock or stock bonus award,
the  recipient  normally will  recognize  taxable  ordinary  income equal to the
excess of the  stock's  fair  market  value  over the  purchase  price,  if any.
However,  to the  extent  the  stock is  subject  to  certain  types of  vesting
restrictions,  the taxable event will be delayed until the vesting  restrictions
lapse  unless  the  recipient  elects  to be  taxed  on  receipt  of the  stock.
Generally,  with  respect to  employees,  Castelle is required to withhold  from

                                       91
<PAGE>

regular  wages or  supplemental  wage  payments an amount  based on the ordinary
income  recognized.  Subject  to  the  requirement  of  reasonableness  and  the
satisfaction of a tax reporting obligation,  Castelle will generally be entitled
to a business expense deduction equal to the taxable ordinary income realized by
the recipient.  Upon  disposition  of the stock,  the recipient will recognize a
capital gain or loss equal to the  difference  between the selling price and the
sum of the amount paid for such stock,  if any,  plus any amount  recognized  as
ordinary income upon  acquisition  (or vesting) of the stock.  Such gain or loss
will be long or short-term depending on whether the stock was held for more than
one year from the date ordinary income is measured. Slightly different rules may
apply to persons who acquire stock subject to forfeiture  under Section 16(b) of
the Exchange Act.

         Potential  Limitation  on Company  Deductions.  As part of the  Omnibus
Budget  Reconciliation  Act of 1993, the U.S.  Congress  amended the Code to add
Section  162(m) which denies a deduction to any publicly  held  corporation  for
compensation  paid to certain  employees  in a taxable  year to the extent  that
compensation  exceeds $1 million for a covered  employee.  It is  possible  that
compensation  attributable  to awards  granted in the future under the Incentive
Plan, when combined with all other types of  compensation  received by a covered
employee  from  Castelle,  may  cause  this  limitation  to be  exceeded  in any
particular year.

            CASTELLE'S 1995 NON-EMPLOYEE DIRECTORS' STOCK OPTION PLAN

General

     The 1995  Non-Employee  Directors'  Stock Option Plan (the "Plan") provides
for the non-  discretionary  grant of nonstatutory stock options to non-employee
directors of Castelle.  Nonstatutory  stock  options  granted under the Plan are
intended not to qualify as incentive  stock options under the Code. See "Federal
Income Tax  Information"  for a discussion of the tax treatment of  nonstatutory
stock options.

Purpose

     The Plan was adopted to provide a means by which each  director of Castelle
who is not otherwise an employee of Castelle  could be given an  opportunity  to
benefit  from  increases  in the value of the stock of  Castelle,  to secure and
retain the services of persons  capable of filling such positions and to provide
incentives  for such  persons  to  exert  maximum  efforts  for the  success  of
Castelle.  Five of Castelle's  current  directors are eligible to participate in
the Plan.

Administration

     The Plan is administered  by the Board of Directors of Castelle.  The Board
has the power to construe  and  interpret  the Plan.  The Board of  Directors is
authorized to delegate administration of the Plan to a committee composed of not
fewer than two members of the Board.  The Board does not  presently  contemplate
delegating administration of the Plan to any committee of the Board.

Eligibility

     Options  may be  granted  only to  directors  who are not  employees  of or
consultants to Castelle or to any affiliate of Castelle.


                                       92

<PAGE>



Stock Subject to the Plan

     If options  granted  under the Plan expire or otherwise  terminate  without
being exercised,  the Common Stock not purchased  pursuant to such options again
becomes available for issuance under the Plan.

Terms of Options

     The following is a description  of the  permissible  terms of options under
the Plan.

     Non-Discretionary    Grants.    Option    grants   under   the   Plan   are
non-discretionary.  Each person serving as a non-employee director on April 1 of
each year  beginning  with April 1, 1996,  receives an option to purchase  2,000
shares of Common  Stock of  Castelle.  Each  person who is elected to serve as a
non-employee  director will receive, upon his or her initial election, an option
to purchase 5,000 shares of Common Stock of Castelle.

     Exercise Price; Payment. The exercise price of options under the Plan shall
be 100% of the fair market  value of the Common  Stock  subject to the option on
the date of the option  grant.  Payment of the  exercise  price per share may be
paid in cash or Common Stock of Castelle already owned by the optionee.

     Option  Exercise.  Options  granted  under the Plan become  exercisable  in
cumulative increments ("vest").  Shares covered by currently outstanding options
under the Plan vest at the rate of 1/24th  per month  (50% per year)  during the
optionee's employment or services as a director or consultant. In the event of a
Change  in  Control  of  Castelle,  such as a merger or  consolidation  in which
Castelle  is  not  the  surviving  corporation,   any  unvested  portion  of  an
outstanding  option granted under the Plan shall immediately vest and the option
shall  terminate  if  not  exercised  prior  to  such  Change  in  Control.  The
acceleration  of an option in the event of an acquisition  or similar  corporate
event may be viewed as an anti-takeover provision,  which may have the effect of
discouraging a proposal to acquire or otherwise  obtain control of Castelle.  An
optionee shall arrange to Castelle's  satisfaction to meet any federal, state or
local tax  withholding  obligation  relating to the exercise of such option by a
cash payment upon exercise, before Castelle shall be required to issue shares of
stock to the optionee.

     Term. The maximum term of options under the Plan is 10 years. Options under
the Plan terminate 12 months after  termination of the optionee's  employment or
relationship  as a  consultant  or  director of  Castelle  or any  affiliate  of
Castelle,  unless the optionee dies while employed by or serving as a consultant
or director of Castelle or any  affiliate of Castelle,  in which case the option
may be exercised  (to the extent the option was  exercisable  at the time of the
optionee's  death) within eighteen months of the optionee's  death by the person
or  persons  to whom the  rights to such  option  pass by will or by the laws of
descent and distribution.

Adjustment Provisions

     If there is any  change in the stock  subject to the Plan or subject to any
option  under  the  Plan   (through   merger,   consolidation,   reorganization,
recapitalization,  stock dividend,  dividend in property other than cash,  stock
split,  liquidating dividend,  combination of shares, exchange of shares, change
in  corporate  structure  or  otherwise),   the  Plan  and  options  outstanding
thereunder will be appropriately adjusted as to the class and the maximum number
of shares  subject to such plan,  and the class,  number of shares and price per
share of stock subject to such outstanding options.


                                       93

<PAGE>




Duration, Amendment and Termination

     The Board may suspend or terminate the Plan without shareholder approval or
ratification at any time.

     The Board may also  amend the Plan at any time or from time to time  except
the Plan shall be amended not more than once every six (6) months.  However,  no
amendment  will be effective  unless  approved by the  shareholders  of Castelle
within  twelve months before or after its adoption by the Board if the amendment
would: (a) modify the requirements as to eligibility for  participation  (to the
extent such modification  requires shareholder approval in order for the Plan to
satisfy Rule 16b-3 ("Rule  16b-3") of the  Securities  Exchange Act of 1934,  as
amended (the  "Exchange  Act"));  (b) increase the number of shares which may be
issued  under the Plan;  or (c)  change any other  provision  of the Plan in any
other way if such modification  requires shareholder approval in order to comply
with Rule 16b-3.

Restrictions on Transfer

     Under the Plan, an option may not be  transferred  except by will or by the
laws of descent and  distribution.  In any case, the optionee may, by delivering
written notice to Castelle,  designate in writing a third party who may exercise
the option in the event of the optionee's death.

Federal Income Tax Information

     Stock  options  granted  under the Plan are  subject to federal  income tax
treatment  pursuant to rules  governing  options  that are not  incentive  stock
options.

     The  following is only a summary of the effect of federal  income  taxation
upon the optionee and Castelle with respect to the grant and exercise of options
under the Plan,  does not purport to be complete and does not discuss the income
tax laws of any state or foreign country in which an optionee may reside.

     Options granted under the Plan are nonstatutory stock options. There are no
tax  consequences  to the  optionee  or  Castelle  by  reason  of the grant of a
nonstatutory  stock option.  Upon exercise of a nonstatutory  stock option,  the
optionee  normally will recognize taxable ordinary income equal to the excess of
the stock's fair market value on the date of exercise  over the option  exercise
price. Because the optionee is a director of Castelle,  under existing laws, the
date of taxation (and the date of measurement of taxable ordinary income) may in
some  instances be deferred  unless the optionee files an election under Section
83(b) of the Code.  The filing of Section  83(b)  election  with  respect to the
exercise of an option may affect the time of  taxation  and the amount of income
recognized at each such time. Upon  disposition of the stock,  the optionee will
recognize  a capital  gain or loss equal to the  difference  between the selling
price and the sum of the amount  paid for such stock plus any amount  recognized
as ordinary income upon exercise of such option.  Such gain or loss will be long
or short-term depending on whether the stock was held for more than one year.


                                       94

<PAGE>



                               MANAGEMENT OF IBEX

     The executive  officers and  directors and certain other  employees of Ibex
are as follows:

         Name                   Age       Principal Occupation/
                                          Position Held With Ibex

         Ney Grant              38        Chairman of the Board,
                                          President and Director

         Curtis Powell          40        Vice President of Development

         Clovis Mattos          41        Vice President of Sales

         Fabio Matsui           31        Senior Software Engineer

         Bryan Roe              29        Director of Sales and Marketing

         Graeme Plant           38        Director

         Teodoro Gimenez        48        Director

     Ney Grant is a  co-founder  of Ibex and has served as Chairman of the Board
and  President  since 1990.  Previous to starting  Ibex in 1989,  Mr.  Grant was
product marketing manager at Genesis Electronics, a voice mail manufacturer with
$10  million  in sales.  Prior to  Genesis,  Ney  served as  general  manager at
Heuristics,  Inc., a $3 million industrial software company.  Mr. Grant holds an
engineering  degree from the University of California,  Santa Barbara and an MBA
from the University California, Davis.

     Curtis Powell is a co-founder  of Ibex and has served as Vice  President of
Development  since 1990.  Previous to Ibex, Mr. Powell worked in process control
and  industrial  automation  and  as a  system  analyst  at  the  University  of
California,  Davis.  Mr. Powell holds a Ph.D.  and an MBA from the University of
California, Davis.

     Clovis Mattos is a co-founder  of Ibex and has served as Vice  President of
Sales since 1992. Mr. Mattos has a sales background in the computer industry and
from 1987 to 1992 was  director  of sales  operations  and  international  sales
manager at Heuristics, Inc.

     Fabio Matsui has served as Senior  Software  Engineer with Ibex since 1993.
Prior to Ibex,  Mr. Matsui worked at  Heuristics,  Inc. as a principal  engineer
from  1989  to  1993  and  held a key  role on the  development  team  designing
real-time  industrial process control systems.  As an early adopter of graphical
user interfaces,  multi-tasking  operating systems,  client-server  computer and
object  oriented  systems,  he designed and managed the  development of advanced
control  systems for Fortune 500 companies.  Mr. Matsui received his Bachelor of
Science degree at the Universidade Estadual De Campinas in Brasil.

     Bryan Roe has served as Director of Sales and Marketing of Ibex since 1992.
From 1989 to 1991 Mr. Roe was regional sales manager for Heuristics,  Inc. where
he was  responsible  for opening new  marketing  channels in the western  United
States and the Pacific Rim. Mr. Roe received his formal  business  training from

                                       95
<PAGE>

the University of California,  Davis, where he earned a degree in communications
with an emphasis on advertising/public relations and marketing.

     Graeme Plant has served as a director of the Company since 1991.  Mr. Plant
has been Sales Development Manager for Hewlett Packard since 1993,  specializing
in network devices and networking  software.  From 1990 to 1993, Mr. Plant was a
Product  Marketing  Manager for network products such as network interface cards
and network hubs.

     Teodoro  Gimenez has served as a director of the  Company  since 1991.  Mr.
Gimenez is President of Tecom, a Brazilian  company  specializing in interactive
voice  response  systems  for the  banking  industry  in Brazil and other  South
American countries. Tecom is not a reseller or distributor of Ibex products.

Executive Compensation

     The following table sets forth certain information  regarding  compensation
paid by Ibex for services rendered to Ibex during the fiscal year ended December
31, 1995 to the Chief  Executive  Officer of Ibex. No executive  officer of Ibex
received compensation in excess of $100,000.

<TABLE>
<CAPTION>

                           Summary Compensation Table
                                                                                                   Long-Term
                                                      Annual Compensation                         Compensation
            Name and               -----------------------------------------------------------  ---------------
       Principal Position             Salary ($)               Bonus ($)         Other ($)          Options (#)
- ---------------------------------  ------------------        -------------  ------------------  ---------------

<S>                                         <C>                       <C>                 <C>              <C>
Ney Grant, President and                    $85,000                  -0-                 -0-              -0-
Chief Executive Officer

</TABLE>

                                       96

<PAGE>



                  CASTELLE CONSOLIDATED SELECTED FINANCIAL DATA
                    (in thousands, except per share amounts)

     The selected consolidated financial data of Castelle set forth below should
be read in conjunction with the consolidated  financial  statements of Castelle,
including  the notes  thereto,  and  "Management's  Discussion  and  Analysis of
Financial  Condition and Results of Operations of Castelle"  included  elsewhere
herein.  The  consolidated  statement  of  operations  data for the years  ended
December 31, 1991, 1992, 1993, 1994 and 1995 and the consolidated  balance sheet
data at December 31, 1991,  1992,  1993,  1994 and 1995 are derived from and are
qualified by reference to, audited  consolidated  financial statements contained
in this Prospectus.  The  consolidated  statement of operations data for the six
month periods ended June 30, 1995 and June 28, 1996 and the consolidated balance
sheet data at June 28, 1996 are derived from  unaudited  consolidated  financial
statements that have been prepared on the same basis as the audited consolidated
financial statements and, in the opinion of management, include all adjustments,
consisting  only  of  normal  recurring   adjustments,   necessary  for  a  fair
presentation of the results of operations and other information for such period.
These  historical  results  are not  necessarily  indicative  of the  results of
operations  to be expected  for the full fiscal year or any future  period.  See
"Management's  Discussion  and  Analysis of Financial  Condition  and Results of
Operations of Castelle."

                                       97

<PAGE>

<TABLE>
<CAPTION>


Statement of Operations Data:
(in thousands, except per share amounts)
                                                                                                           Six Months
                                                        Year Ended December 31,                              Ended
                                        ------------------------------------------------------       --------------------- 
                                                                                                      June 30,    June 28,
                                             1991       1992       1993      1994       1995            1995        1996
                                            ------     ------     ------    ------     ------          ------      -----
                                                                                                    (unaudited) (unaudited)
Historical Consolidated Statement
of Operations Data:
<S>                                     <C>         <C>        <C>        <C>       <C>              <C>       <C>        
    Net sales ......................... $    9,067  $  19,008  $  17,787  $ 19,486  $   25,082       $ 11,874  $    13,425
    Cost of sales......................      5,457     10,563     11,346    11,503      13,571          6,385        7,117
                                        ----------  ---------  ---------  --------  ----------       --------  -----------
        Gross profit...................      3,610      8,445      6,441     7,983      11,511          5,489        6,308
                                        ----------  ---------  ---------  --------  ----------       --------  -----------

    Operating expenses:
        Research and development.......      1,632      1,927      2,152     2,179       2,018            996        1,057
        Sales and marketing............      2,649      4,959      5,628     4,384       5,641          2,785        3,199
        General and administrative.....        850      1,313      1,977     1,446       1,405            623          718
        Restructuring charge...........         --         --        615        --          --             --           --
                                        ----------  ---------  ---------  --------  ----------       --------  -----------
           Total operating expenses....      5,131      8,199     10,372     8,009       9,064          4,404        4,974
                                        ----------  ---------  ---------  --------  ----------       --------  -----------

    Operating income (loss)............     (1,521)       246     (3,931)      (26)      2,447          1,085        1,334
    Interest income (expense)..........        (11)      (157)      (349)     (481)       (296)          (192)         167
    Other income (expense), net........         23         48       (515)      129         (53)           --           (75)
                                        ----------  ---------  ---------  --------  ----------       --------  -----------
    Income (loss) before provision
        for income taxes...............     (1,509)       137     (4,795)     (378)      2,098            893        1,426
    Provision for income taxes.........         --         11         --        --          74             23           64
                                        ----------  ---------  ---------   -------  ----------       --------  -----------
    Net income (loss).................. $   (1,509) $     126  $  (4,795) $   (378) $    2,024       $    870  $     1,362
                                        ==========  =========  =========  ========  ==========       ========  ===========
    Net income (loss) per share (1).... $    (5.80) $    0.09  $  (12.11) $  (0.91) $     0.77       $   0.34  $      0.35
                                        ==========  =========  =========  ========  ==========       ========  ===========
    Shares used in per share 
        calculation (1)................        260      1,330        396       414       2,673          2,648        3,887
                                            ======  =========  =========  ========  ==========       ========  ===========
    Pro forma net loss per share (1) ..                                   $  (0.16)
                                                                          ========
    Pro forma shares used in
        per share calculation (1) .....                                      2,396
                                                                          ========
</TABLE>
<TABLE>
<CAPTION>

    Statement of Operations Data as a Percentage of Net Sales:
                                                                                                           Six Months
                                                        Year Ended December 31,                              Ended
                                       ---------------------------------------------------------    ------------------------
                                                                                                     June 30,    June 28,
                                           1991        1992       1993      1994       1995            1995        1996
                                          ------      ------     ------    ------     ------          ------      ------
                                                                                                    (unaudited)(unaudited)

<S>                                        <C>        <C>        <C>       <C>         <C>            <C>          <C>   
    Net sales..........................    100.0%     100.0%     100.0%    100.0%      100.0%         100.0%       100.0%
    Cost of sales......................     60.2       55.6       63.8      59.0        54.1           53.8         53.0
                                           -----     ------     ------    ------       -----           ----        -----
        Gross margins..................     39.8       44.4       36.2      41.0        45.9           46.2         47.0
    Operating expenses:
        Research and development.......     18.0       10.1       12.1      11.2         8.0            8.4          7.9
        Sales and marketing ...........     29.2       26.1       31.6      22.5        22.5           23.5         23.8
        General and administrative.....      9.4        6.9       11.1       7.4         5.6            5.2          5.3
        Restructuring charge...........       --         --        3.5        --          --             --           --
                                           -----      -----     ------     -----       -----          -----       ------
            Total operating expense....     56.6       43.1       58.3      41.1        36.1           37.1         37.0
                                           -----      -----     ------     -----       -----          -----       ------
    Operating income (loss)............    (16.8)       1.3      (22.1)     (0.1)        9.8            9.1         10.0
    Interest expense...................     (0.1)      (0.8)      (2.0)     (2.5)       (1.2)          (1.6)         1.2
    Other income (expense), net........      0.3        0.2       (2.9)      0.7        (0.2)            --         (0.6)
                                           -----      -----     ------     -----      ------          -----       ------
    Income (loss) before provision
        for income taxes...............    (16.6)       0.7      (27.0)     (1.9)        8.4            7.5         10.6
    Provision for income taxes.........       --         --         --        --         0.3            0.2          0.5
                                           -----      -----     ------    ------      ------          -----       ------
    Net income (loss)..................    (16.6)%      0.7%     (27.0)%    (1.9)%       8.1%           7.3%        10.1%
                                           =====      =====     ======    ======      ======          =====       ======

</TABLE>

                                       98

<PAGE>

<TABLE>
<CAPTION>



                                                                   As of December 31,                            June 28,
                                               ----------------------------------------------------------      
                                                      1991       1992        1993        1994       1995           1996
                                                      ----       ----        ----        ----       ----           ----
                                                                                                               (unaudited)
Historical Balance Sheet Data:
<S>                                                 <C>       <C>        <C>           <C>        <C>            <C>    
    Working capital (deficit).................      $1,872    $ 2,293    $  (765)      $  884     $8,849         $11,241
    Total assets..............................       5,144     10,114      8,623        7,124     14,667          15,696
    Short-term debt...........................         507      2,163      4,174        2,670        193              --
    Total shareholders' equity (deficit)......       2,390      3,493     (1,264)       1,355      9,289          11,709

</TABLE>


     (1)  Computed  on the basis  described  for net income  (loss) per share in
          Note 2 of Notes to Consolidated Financial Statements.
 


                                       99

<PAGE>



                MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                 CONDITION AND RESULTS OF OPERATIONS OF CASTELLE

     Except for the  historical  information  contained  herein,  the  following
discussion   contains  forward-  looking   statements  that  involve  risks  and
uncertainties.  Castelle's  actual  results could differ  materially  from those
discussed  here.  Factors  that could cause or  contribute  to such  differences
include,  but are not limited to, those  discussed in this section as well as in
the sections entitled "Risk Factors," "Summary,"  "Unaudited Pro Forma Condensed
Combined Financial  Information," "Business of Castelle," "Business of Ibex" and
"Management's  Discussion  and  Analysis of Financial  Condition  and Results of
Operations of Ibex."

     Castelle  was  founded in 1987 to design,  manufacture  and market  network
enhancement  products  which  enhance  network  users'  ability to  communicate.
Castelle shipped its first fax server, the FaxPress, in 1989; its first external
print server,  the LANpress,  in 1990; and its first internal print server,  the
JetPress, in 1991.  Subsequent to these initial product shipments,  Castelle has
developed  and shipped  enhanced  software  versions of its fax and print server
products  and has expanded the product  offerings  within each of these  product
lines.  In addition,  Castelle has entered a partnership  with 3Com to penetrate
the SOHO market.

     During the first half of 1993, Castelle scaled up its marketing and general
and  administrative  expense levels in anticipation  of increased  sales. At the
same time,  Castelle  began  offering  extended  payment terms and other pricing
promotions to certain distributors, which resulted in excessive inventory levels
of Castelle's  products held by these distributors and subsequently  resulted in
significant  product returns from these  distributors  and associated  inventory
write offs in the amount of approximately  $729,000.  These  write-offs  applied
principally to print  server-related  products and parts. In addition,  Castelle
wrote down by approximately  $213,000 the value of demonstration  and evaluation
units  associated with  Castelle's  sales and marketing  activities.  During the
second half of 1993,  Castelle  undertook a  substantial  restructuring  effort,
hiring a new senior  management  team that  implemented a number of  initiatives
including new marketing  activities and distribution  policies,  a refocusing of
Castelle's   research  and  development   efforts  and  implementation  of  cost
containment  procedures.  As a result of the  above-described  product  returns,
Castelle experienced  significantly decreased gross margins during 1993. Coupled
with a substantial restructuring charge, this resulted in a substantial net loss
for 1993. Since the restructuring, Castelle has experienced improved operations.

Six Months Ended June 28, 1996 and June 30, 1995

     Net Sales.  Net sales were $13.4 million for the first half of fiscal 1996,
up 13.1% from the $11.9 million reported for the same period in fiscal 1995. The
increase in net sales resulted  primarily from higher sales of the Company's fax
server products. Fax server product sales increased 31.1% to $5.9 million in the
six month period  ending June 28, 1996 from $4.5 million  during the  comparable
period in fiscal 1995. Print server sales were $7.4 million for the first halves
of fiscal 1996 and 1995.

     Gross  Profit.  Gross profit for the first half of fiscal 1996 was 47.0% as
compared  with 46.2% for the same period in fiscal  1995.  The increase in gross
margin was primarily attributable to increased sales of the Company's fax server
products, which carry higher gross margins.

     Research and  Development.  Research  and  development  expenses  were $1.1
million and $1.0 million for the first half of 1996 and 1995,  respectively,  or
7.9% and 8.4% of net sales each year,  respectively,  reflecting  the  Company's
continued emphasis on research and development in order to develop new products,

                                      100
<PAGE>

as well as to improve product functionality, reduce cost and enhance performance
of existing products.

     Sales and  Marketing.  Sales and  marketing  expenses were $3.2 million and
$2.8  million  for the first half of 1996 and 1995,  respectively,  or 23.8% and
23.5% of net sales each year, respectively.  The dollar increase was primarily a
result of higher expenditures on advertising and marketing materials.

     General  and  Administrative.  General  and  administrative  expenses  were
$718,000 and $623,000 for the first half of 1996 and 1995, respectively, or 5.3%
and 5.2% of net sales each year, respectively.

     Interest Income/(Expense), net. Interest income, net, was $167,000 compared
to  interest  expense,  net,  of  $192,000  for the first half of 1996 and 1995,
respectively.  The  increase in 1996 was due  primarily  to  interest  earned on
investment  balances related to funds generated by the Company's  initial public
offering in December  1995 and the  decrease  in  interest  expense  realized by
paying off the Company's bank borrowings and long-term debt.

Years Ended December 31, 1995, 1994 and 1993

     Net Sales.  Net sales  increased  28.7% to $25.1 million in 1995 from $19.5
million in 1994.  This increase was  principally  due to an increase in sales of
the FaxPress product line,  principally the FaxPress 2000 and FaxPress 3000, and
increased demand for print servers in Japan. Net sales increased 9.6% in 1994 to
$19.5 million from $17.8 million in 1993.  This increase was  principally due to
an  increase  in sales of fax servers in all regions and an increase in sales of
print  servers in Japan,  which  more than  offset a decrease  in  domestic  and
European sales of print servers and a decrease in sales to OEM's of print server
products.  International sales were $13.0 million, $8.2 million and $6.4 million
in 1995,  1994 and  1993,  respectively,  representing  51.8%,  42.1% and 36.0 %
respectively, of net sales in 1995, 1994 and 1993. This increase in sales is due
primarily  to growth in the  Pacific  Rim  region.  Although  all of  Castelle's
international  sales to date have been denominated in U.S.  dollars,  such sales
could be adversely  affected by changes in demand resulting from fluctuations in
currency exchange rates.

     Cost of  Sales.  Cost  of  sales  includes  cost  of  materials,  including
components,  manuals,  diskettes  and their  duplication,  packaging  materials,
assembly and shipping, as well as certain royalties. Cost of sales also includes
compensation costs and overhead related to Castelle's  manufacturing  operations
and warranty expenses.  Cost of sales was $13.6 million, $11.5 million and $11.3
million in 1995, 1994 and 1993,  respectively,  and represented 54.1%, 59.0% and
63.8% of net  sales  for  those  periods.  Cost of sales  in 1995  increased  in
absolute  dollars but decreased as a percentage  of net sales  compared to 1994.
This  percentage  decrease was primarily  attributable to changes in product mix
towards a higher  proportion  of net sales  derived from fax server  products as
well as manufacturing  and purchasing  efficiencies  realized from higher volume
operations.  The decrease  from 1993 to 1994 was due primarily to a reduction in
manufacturing  overhead  as a  percentage  of  net  sales  which  resulted  from
manufacturing efficiencies.

     Research and  Development.  Research  and  development  expenses  were $2.0
million,  $2.2  million and $2.2 million in 1995,  1994 and 1993,  respectively,
which expenditures were relatively  constant in absolute dollars but represented
a smaller  percentage  of net sales each  successive  year.  Most of  Castelle's
product  development  initiatives during these periods were directed towards fax
server  products,  although much of the resultant  technology has application to
the further  development  of  Castelle's  print server  products.  A significant
percentage  of  Castelle's  research  and  development  expenses  are related to
software  development.  During 1995, research and development expenses continued
to decrease as a percentage  of net sales as a result of a more focused  product

                                      101
<PAGE>

development  program  and,  to a lesser  extent,  increased  reliance in 1995 on
products developed and manufactured by third parties.  Castelle anticipates that
the dollar  amount of research and  development  expenses  will  increase in the
future  as a result  of its  continuing  commitment  to the  development  of new
products.

     Sales and Marketing.  Sales and marketing expenses were $5.6 million,  $4.4
million  and $5.6  million  in 1995,  1994 and  1993,  respectively.  Sales  and
marketing  expenses  increased in absolute  dollars in 1995  primarily due to an
increase in the number of sales and marketing personnel,  additional advertising
and sales  promotional  expense,  higher  travel  costs  and  facilities-related
expenses  needed to address sales  opportunities  and better  support  customers
using Castelle's  products.  Sales and marketing expenses decreased from 1993 to
1994 primarily due to decreases in salary  expenses as a result of reduced sales
and marketing  personnel,  lower advertising and sales promotional  expenses and
lower  depreciation  expenses  related  to a  write  down of  demonstration  and
evaluation units in 1993, all of which resulted from cost  containment  policies
instituted by new management in late 1993.

     General and  Administrative.  General and administrative  expenses remained
relatively  constant in absolute  dollars at $1.4  million in both 1995 and 1994
and  decreased  26.9% in 1994 to $1.4  million  from $2.0  million in 1993.  The
decrease  from  1993 to 1994  was due to  lower  expenses  resulting  from  cost
containment measures implemented by new management.

     Restructuring Charge.  Castelle recorded a restructuring charge of $615,000
in 1993 primarily  related to severance  payments and  facilities  consolidation
costs.

     Interest Expense. Castelle incurred interest expense of $296,000, $481,000,
and  $349,000 in 1995,  1994 and 1993,  respectively.  The  decrease in interest
expense in 1995 was due to lower outstanding bank borrowings and long-term debt.
The  increase  in  interest  expense  in 1994 was  principally  attributable  to
interest paid on a long-term  note payable that resulted from the  conversion in
March 1994 of $2.1 million of accounts payable due to a vendor.

     Other Income (Expense), Net. Castelle recorded other expense of $515,000 in
1993, primarily related to legal,  accounting and printing costs associated with
a proposed  initial  public  offering  of its  Common  Stock.  The 1993  expense
included certain  accruals,  of which $129,000 was recognized as other income in
1994 following favorable settlements of the related obligations.

     Provision for Income Taxes.  See Note 8 of Notes to Consolidated  Financial
Statements for a discussion of Castelle's provision for income taxes.

                                       102

<PAGE>



Selected Quarterly Operating Results

     The following table presents unaudited quarterly financial  information for
the ten  quarters in the period ended June 28, 1996.  Management  believes  this
information  has been  prepared  on the same basis as the  audited  consolidated
financial  statements  appearing  elsewhere in this  Prospectus and includes all
adjustments,  consisting  only of normal  recurring  adjustments,  necessary  to
present  fairly  the  unaudited   quarterly   operating  results  when  read  in
conjunction with the audited  consolidated  financial statements of Castelle and
the notes  thereto  appearing  elsewhere  in this  Prospectus.  These  operating
results are not necessarily indicative of results for any future period.

<TABLE>
<CAPTION>

                                                                        Quarter Ended
                                ------------------------------------------------------------------------------------------------  
                                April 1, July 1,  Sept. 30,  Dec. 31,  Mar. 31,  June 30, Sept. 29, Dec. 31,  Mar. 29,  June 28,
                                  1994    1994      1994       1994      1995      1995     1995      1995      1996      1996
                                -------  ------   --------   -------   -------   -------  --------  -------   -------   -------
                                                                    (dollars in thousands)

Statement of Operations Data:

<S>                              <C>     <C>       <C>        <C>       <C>       <C>      <C>       <C>       <C>       <C>   
    Net sales..................  $4,199  $4,548    $5,103     $5,636    $5,684    $6,190   $6,763    $6,445    $6,200    $7,225
    Cost of sales..............   2,618   2,697     2,949      3,239     2,979     3,406    3,674     3,512     3,339     3,778
                                 ------  ------    ------     ------    ------    ------   ------     -----     -----     -----
      Gross profit.............   1,581   1,851     2,154      2,397     2,705     2,784    3,089     2,933     2,861     3,447

    Operating expenses:
       Research and 
       development.............     459     519       608        593       499       497      554       468       533       524
       Sales and marketing.....   1,097   1,163     1,048      1,076     1,363     1,422    1,449     1,407     1,493     1,706
       General and 
       administrative..........     320     374       348        404       314       309      407       375       291       427
                                 ------  ------    ------     ------    ------     -----    -----     -----     -----     ----- 
          Total operating 
          expenses.............   1,876   2,056     2,004      2,073     2,176     2,228    2,410     2,250     2,317     2,657
                                 ------  ------    ------     ------    ------    ------    -----     -----     -----     -----

    Operating income (loss)....    (295)   (205)      150        324       529       556      679       683       544       790
    Interest income 
    (expense), net.............    (107)    (77)      (99)      (198)     (119)      (73)     (73)      (31)       73        94
    Other income (expense),
    net........................      --     129        --         --        --        --      (10)      (43)      (20)      (55)
                                -------  ------   -------     ------    ------    ------   ------   -------    ------   -------
   Income (loss) before 
   provision for income taxes..    (402)   (153)       51        126       410       483      596       609       597       829
   Provision for income taxes..      --      --        --         --         5        18       24        27        28        36
                                -------  ------   -------     ------    ------    ------   ------   -------    ------   -------
    Net income (loss).......... $  (402) $ (153)  $    51     $  126    $  405    $  465   $  572   $   582    $  569    $  793
                                =======  ======   =======     ======    ======    ======   ======   =======    ======    ======


</TABLE>



                                       103

<PAGE>
<TABLE>
<CAPTION>
                                                                         Quarter Ended       
                                 ------------------------------------------------------------------------------------------------
                                 April 1, July 1,  Sept. 30,  Dec. 31,  Mar. 31,  June 30, Sept. 29, Dec. 31,  Mar. 29,  June 28,
                                   1994    1994      1994       1994      1995      1995     1995      1995      1996      1996  
                                 -------  ------   --------   -------   -------   -------  --------  -------   -------   ------- 
                                        
As a Percentage of Net Sales:   

<S>                               <C>      <C>      <C>        <C>       <C>       <C>      <C>       <C>       <C>       <C>   
    Net sales...................  100.0%   100.0%   100.0%     100.0%    100.0%    100.0%   100.0%    100.0%    100.0%    100.0%
    Cost of sales...............   62.3     59.3     57.8       57.5      52.4      55.0     54.3      54.5      53.9      52.3
                                  -----    -----    -----      -----    ------     -----     ----      ----      ----     -----
       Gross margin.............   37.7     40.7     42.2       42.5      47.6      45.0     45.7      45.5      46.1      47.7

    Operating expenses..........
       Research and 
       development..............   11.0     11.4     11.9       10.5       8.8       8.0      8.2       7.3       8.6       7.3
       Sales and marketing......   26.1     25.6     20.6       19.1      24.0      23.0     21.4      21.8      24.1      23.6
       General and
       administrative...........    7.6      8.2      6.8        7.2       5.5       5.0      5.9       5.8       4.7       5.9
                                  -----    -----    -----      -----     -----     -----    -----     -----      ----     -----
         Total operating 
         expenses...............   44.7     45.2     39.3       36.8      38.3      36.0     35.5      34.9      37.4      36.8
                                  -----    -----    -----      -----     -----     -----    -----     -----      ----     -----

    Operating Income (loss).....   (7.0)    (4.5)     2.9        5.7       9.3       9.0     10.2      10.6       8.7      10.9
    Interest expense............   (2.6)    (1.7)    (1.9)      (3.5)     (2.1)     (1.2)    (1.1)     (0.5)      1.2       1.3
    Other income (expense),
    net.........................     --      2.8       --         --        --        --     (0.2)     (0.7)     (0.3)     (0.7)
                                  -----     ----    -----       ----      ----      ----     ----     -----      ----      ----
    Income (loss) before
    provision for income taxes..   (9.6)    (3.4)     1.0        2.2       7.2       7.8      8.9       9.4       9.6      11.5

    Provision for income taxes..     --       --       --         --       0.1       0.3      0.4       0.4       0.4       0.5
                                  -----     ----    -----       ----      ----      ----     ----      ----      ----      ----
    Net income (loss)...........   (9.6)%   (3.4)%    1.0%       2.2%      7.1%      7.5%     8.5%      9.0%      9.2%     11.0%
                                  =====     ====    =====       ====      ====      ====     ====      ====      ====      ====


</TABLE>

                                       104

<PAGE>



Quarterly Fluctuations

     Castelle's operating results may vary significantly from quarter to quarter
due to a variety  of  factors,  including  changes  in  Castelle's  product  and
customer mix, the  introduction of new products by Castelle or its  competitors,
constraints in Castelle's manufacturing and assembling operations,  shortages or
increases  in the prices of raw  materials  and  components,  changes in pricing
policy  by  Castelle  or  its  competitors,  a  slowdown  in the  growth  of the
networking market,  seasonality,  timing of expenditures and economic conditions
in the United States,  Europe and Asia. Although on a quarterly basis,  Castelle
was  profitable  in each of the last eight  quarters,  there can be no assurance
that profitability on a quarterly or annual basis will be sustained.  Castelle's
backlog at any given time is not necessarily  indicative of actual sales for any
succeeding  period.  Castelle's  sales will often reflect  orders shipped in the
same quarter in which they are received.  In addition,  a significant portion of
Castelle's expenses are relatively fixed in nature, and planned expenditures are
based  primarily  on  sales  forecasts.   Therefore,  if  Castelle  inaccurately
forecasts  demand  for  Castelle's  products,  the  impact on net  income may be
magnified  by  Castelle's   inability  to  adjust  spending  quickly  enough  to
compensate for the sales shortfall. Future demand for Castelle's products may be
stronger  during  the last  quarter  of each year than the first  quarter of the
succeeding year as the sales personnel of Castelle's  distributors  seek to meet
their  year-end  sales  quotas.  Castelle's  performance  in any  quarter is not
necessarily indicative of its performance in any subsequent quarter.

Liquidity and Capital Resources

     Since its inception in 1987,  Castelle has funded its operations  primarily
through  issuances of capital stock and bank  borrowings.  Cash flows from (used
in) operations  were  approximately  ($514,000),  $3.0 million  ($116,000),  and
$836,000,  in the first six months of 1996,  all of fiscal  1995,  all of fiscal
1994 and all of fiscal 1993,  respectively.  Castelle acquired capital equipment
of  approximately  $176,000,  $195,000,  $392,000  and $446,000 in the first six
months of fiscal 1996,  all of fiscal 1995, all of fiscal 1994 and all of fiscal
1993, respectively.

     As  of  June  28,  1996,  Castelle  had  $7.4  million  of  cash  and  cash
equivalents.  Working  capital  increased to $11.2 million at June 28, 1996 from
$8.8 million at December 31, 1995. Castelle has a $6.0 million secured revolving
line of  credit  with a bank  which  expires  in June  1997,  pursuant  to which
Castelle may borrow 75% of eligible domestic  accounts  receivable at the bank's
prime rate. In addition, Castelle has a $3.0 million foreign accounts receivable
and  inventory  line  which  is part of the  overall  $6.0  million  commitment.
Castelle  may borrow 90% of  eligible  accounts  receivable  and 40% of eligible
inventory. Under the terms of the agreement, Castelle is required to comply with
covenants,  including a certain  minimum  quick ratio and tangible net worth and
maximum debt to tangible net worth,  and is also  restricted  from entering into
any mergers or acquisitions where the total annual  consideration  exceeds $15.0
million  without  the bank's  approval.  Castelle  is in  compliance  with these
covenants and at June 28, 1996, the line of credit had a zero balance.  The line
of  credit  prohibits  the  payment  of  cash  dividends  and  contains  certain
restrictions on Castelle's  ability to loan money or assets or purchase interest
in other entities without the prior written consent of the lender.  In addition,
Castelle has a $500,000  equipment  term loan credit  facility  with a bank that
allows  Castelle to borrow 80% of invoice cost of new  equipment.  This facility
has a 12-month draw-down period followed by a 36-month  amortization  period and
terminates  in August 1999.  This  facility had a zero balance at June 28, 1996.
The interest rate for this loan is prime plus 1.5% per annum.


                                       105

<PAGE>



     Castelle believes that existing sources of liquidity, capital resources and
funds from operations  will satisfy  Castelle's  anticipated  cash needs for the
next 12 months. There can be no assurance, however, that Castelle's actual needs
will not exceed  anticipated  levels, or that Castelle will generate  sufficient
sales to fund its operations in the absence of other sources.  There also can be
no assurance that any additional  required  financing will be available  through
bank  borrowings,  debt or  equity  offerings  or  otherwise  or  that,  if such
financing is available, it will be available on terms favorable to Castelle.

                      CASTELLE STOCK, OPTIONS AND DIVIDENDS

     Castelle  is a  publicly-held  company;  its stock is traded on the  Nasdaq
National  Market  System under the symbol  "CSTL." As of the Record Date,  there
were a total of 156  shareholders  of record holding shares of Castelle  capital
stock,  all of whom held Common Stock. As of the Record Date, there were options
outstanding to purchase an aggregate of 295,903 shares of Castelle Common Stock.

     Castelle has never  declared or paid any  dividends on its Common Stock and
has no plans to do so in the foreseeable future.  Castelle's bank line of credit
prohibits the payment of cash dividends.


                                       106

<PAGE>



                          IBEX SELECTED FINANCIAL DATA
                    (in thousands, except per share amounts)

     The  selected  financial  data of Ibex set  forth  below  should be read in
conjunction with the financial  statements of Ibex, including the notes thereto,
and "Management's  Discussion and Analysis of Financial Condition and Results of
Operations of Ibex" included  elsewhere herein. The statement of operations data
for the years ended  December  31,  1994 and 1995 and the balance  sheet data at
December 31, 1994 and 1995 are derived from,  and are qualified by reference to,
audited  financial  statements  contained in this  Prospectus.  The statement of
operations data for the years ended December 31, 1991, 1992 and 1993 and the six
month  periods  ended  June 30,  1995 and 1996,  and the  balance  sheet data at
December  31,  1991,  1992  and  1993 and at June 30,  1996,  are  derived  from
unaudited financial  statements that have been prepared on the same basis as the
audited  financial  statements  and, in the opinion of  management,  include all
adjustments,  consisting only of normal recurring  adjustments,  necessary for a
fair  presentation  of the results of operations and other  information for such
period.  These historical results are not necessarily  indicative of the results
of operations to be expected for the full fiscal year or any future period.  See
"Management's  Discussion  and  Analysis of Financial  Condition  and Results of
Operations of Ibex."

<TABLE>
<CAPTION>

                                                         Year Ended December 31,                          Six Months Ended
                                       ---------------------------------------------------------       ----------------------
                                                                                                        June 30,     June 30,
                                          1991         1992        1993       1994        1995            1995         1996
                                          ----         ----        ----       ----        ----           ------       -----
Historical Statement of Operations Data(unaudited) (unaudited) (unaudited)                              (unaudited) (unaudited)
<S>                                    <C>         <C>         <C>         <C>         <C>             <C>          <C>      
     Net sales .....................   $     521   $    1,020  $    1,791  $   2,708   $   3,091       $    1,393   $   2,075
     Cost of sales..................         218          290         554        691         732              355         444
                                       ---------   ----------  ----------  ---------   ---------       ----------   ---------
        Gross profit................         303          730       1,237      2,017       2,359            1,038       1,631
                                       ---------   ----------  ----------  ---------   ---------       ----------   ---------

     Operating expenses:
        Research and development.....         95          153         245        432         648              418         342
        Sales and marketing..........        128          368         638        988       1,391              660         760
        General and administrative...         68          197         289        256         262              129         153
                                       ---------   ----------  ----------  ---------   ---------       ----------   ---------
          Total operating expenses...        291          718       1,172      1,676       2,301            1,207       1,255
                                       ---------   ----------  ----------  ---------   ---------       ----------   ---------

     Operating income (loss).........         12           12          65        341          58             (169)        376
     Other income (expense), net.....         (4)          (4)          1         (8)         (4)              (5)         10
                                       ---------   ----------  ----------  ---------   ---------       ----------   ---------
     Income (loss) before provision
        for income taxes.............          8            8          66        333          54             (174)        386
     Provision for (benefit
        from) income taxes...........          1            1          39        121          (5)             (21)        162
                                       ---------   ----------  ----------  ---------   ---------       ----------   ---------
     Net income (loss)...............  $       7   $        7  $       27  $     212   $      59       $     (153)  $     224
                                       =========   ==========  ==========  =========   =========       ==========   =========
     Net income (loss) per share (1).  $    0.06   $     0.05  $     0.15  $    1.11   $    0.30       $    (1.13)  $    1.11
                                       =========   ==========  ==========  =========   =========       ==========   =========
     Shares used in per share 
        calculation (1)..............        116          151         174        191         199              135         201
                                             ===   ==========  ==========  =========   =========       ==========   =========


</TABLE>

     (1)Computed on the basis  described for net income (loss) per share in Note
2 of Notes to Consolidated Financial Statements.



                                       107

<PAGE>

<TABLE>
<CAPTION>




                                                         Year Ended December 31,                      Six Months Ended
                                           -----------------------------------------------------    ---------------------
                                                                                                    June 30,     June 30,
                                           1991        1992        1993       1994        1995        1995         1996
                                           ----        ----        ----       ----        ----       ------       -----
Historical Statement of Operations Data(unaudited) (unaudited) (unaudited)                         (unaudited)  (unaudited)
<S>                                       <C>         <C>         <C>        <C>         <C>          <C>          <C>   
     Net sales .....................      100.0%      100.0%      100.0%     100.0%      100.0%       100.0%       100.0%
     Cost of sales..................       41.8        28.4        30.9       25.5        23.7         25.5         21.4
                                           ----        ----        ----       ----        ----         ----         ----
        Gross profit................       58.2        71.6        69.1       74.5        76.3         74.5         78.6
                                           ----        ----        ----       ----        ----         ----         ----

     Operating expenses:
        Research and development.....      18.2        15.0        13.7       16.0        21.0         30.0         16.5
        Sales and marketing..........      24.6        36.1        35.6       36.5        45.0         47.4         36.6
        General and administrative...      13.1        19.3        16.2        9.4         8.4          9.2          7.4
                                           ----        ----        ----       ----        ----         ----         ----
          Total operating expenses...      55.9        70.4        65.5       61.9        74.4         86.6         60.5
                                           ----        ----        ----       ----        ----         ----         ----

     Operating income (loss).........       2.3         1.2         3.6       12.6         1.9        (12.1)        18.1
     Other income (expense), net.....      (0.8)       (0.4)        0.1       (0.3)       (0.1)        (0.4)         0.5
                                           ----        ----         ---       ----        ----         ----          ---
     Income (loss) before provision
        for income taxes.............       1.5         0.8         3.7       12.3         1.8        (12.5)        18.6
     Provision for (benefit
        from) income taxes...........       0.2         0.1         2.2        4.5        (0.1)        (1.5)         7.8
                                            ---         ---         ---        ---         ---         ----          ---
     Net income (loss)...............       1.3%        0.7%        1.5%       7.8%        1.9%       (11.0%)       10.8%
                                            ====        ====        ====       ====        ====       =======       =====

</TABLE>
<TABLE>
<CAPTION>

                                                                     As of December 31,                                June 30,
                                                ----------------------------------------------------------            ---------
                                                   1991          1992         1993        1994       1995                1996
                                                 (unaudited) (unaudited)  (unaudited)                                (unaudited)
     Historical Balance Sheet Data:
<S>                                              <C>            <C>          <C>         <C>        <C>                <C>   
     Working capital (deficit)................   $   11         $ 266        $ 302       $ 499      $ 593              $  828
     Total assets.............................      126           385          517         934        986               1,484
     Short-term debt..........................       68            --           28          28         75                  25
     Total shareholders' equity ..............       32           341          368         608        700                 924


</TABLE>


                                       108

<PAGE>

                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
              FINANCIAL CONDITION AND RESULTS OF OPERATIONS OF IBEX

     Except for the  historical  information  contained  herein,  the  following
discussion   contains   forward-looking   statements   that  involve  risks  and
uncertainties.   Ibex's  actual  results  could  differ  materially  from  those
discussed  here.  Factors  that could cause or  contribute  to such  differences
include,  but are not limited to, those  discussed in this section as well as in
the sections entitled "Risk Factors," "Summary,"  "Unaudited Pro Forma Condensed
Combined Financial  Information," "Business of Castelle," "Business of Castelle"
and "Management's  Discussion and Analysis of Financial Condition and Results of
Operations of Castelle."

     Ibex was  founded  in 1990 and is the  leading  supplier  of  fax-on-demand
software,  both at the  enterprise  level and for larger  systems  installed  at
service  providers.  Companies  such  as  Delrina,  Pennzoil,  IBM  and  various
government  agencies  are among  those  relying on Ibex's  FactsLine  product to
automatically  fulfill document requests via fax. Ibex is the market leader with
more fax-on-demand telephone lines installed and more fax-on-demand revenue than
any other company in the industry.  Ibex sells mainly to end users  (usually via
VARs) which operate their own systems,  but Ibex also sells to service providers
(usually direct) which base a service business on Ibex equipment.

Six Months Ended June 30, 1996 and June 30, 1995

     Net Sales.  Net Sales include  gross sales of products  less  discounts and
sales returns and allowances.  Net sales increased 49.0% to $2.1 million for the
six months  ended June 30, 1996 from $1.4  million in the  comparable  period of
1995.  The increase was  primarily  attributable  to new Ibex  products  such as
FactsLine for the Web (an HTML to fax conversion  tool) and Ibex OpenFax (a Word
document  and Adobe  Acrobat  conversion  tool) as well as several  large system
orders from enhanced fax service  providers  domestically  and  internationally.
During  the first six months of 1996,  sales to Ibex  Europe,  Ibex's  principal
foreign  distributor,  and Ibex Canada,  Ibex's  largest  domestic  distributor,
accounted for 5.9% and 25.4%, respectively, of Ibex's net sales.

     Cost of Sales. Cost of sales includes cost of materials, manuals, diskettes
and their duplication,  packaging materials,  assembly and shipping,  as well as
certain royalties. Cost of sales also includes voice and fax boards manufactured
by third parties.  Cost of sales decreased as a percentage of net sales to 21.4%
in the 1996 period from 25.5% in the 1995 period.  This percentage  decrease was
primarily attributable to increased hardware pricing, decrease in hardware costs
and increased sales to end users at higher margins.

     Research  and  Development.   Research  and  development  expenses  include
compensation  costs for software,  hardware and quality  assurance  personnel as
well as expenses related to the development of product prototypes.  Research and
development  expenses  decreased  18.2% to $342,000  for the first six months of
1996 from $418,000 in the comparable period of 1995.  During 1996,  research and
development  expenses  decreased as a  percentage  of net sales as a result of a
first  quarter  charge  in  1995  of  approximately  $183,000  relating  to  the
acquisition of the Robofax product line. Relative spending amounts not including
the Robofax  acquisition  would have been  approximately  $235,000 in 1995, or a
45.5% increase in research and development spending from the first six months of
1995 relative to the first six months of 1996. The relative increase in research
and development spending can be attributed to increased research and development
effort in developing the new  fax/email/Web  product line. Ibex  anticipates the
dollar   amount  of  research  and   development   will   continue  to  increase
significantly  over the next two quarters in order to finish  development of the
new  products.  Ibex also  anticipates  that the dollar  amount of research  and

                                      109
<PAGE>

development  expenses will increase in the future as a result of its  continuing
commitment to the development of new products.

     Sales and  Marketing.  Sales and marketing  expenses  include  compensation
costs  (including sales  commissions) for sales,  marketing and customer service
personnel,  as well as costs  associated  with sales  facilities,  trade  shows,
advertising  and  promotional  materials.  Sales and marketing  expenses for the
first six months of 1996 were  $760,000,  compared  to $660,000 in the first six
months of 1995,  an  increase  of 15.2% over the  comparable  1995  period.  The
increase in sales and  marketing  expenses  was  primarily  attributable  to new
marketing  efforts  such as a seven city  seminar  series  that was  planned and
implemented in four cities in the first six months of 1996.  However,  sales and
marketing  expenses as a percentage of net sales decreased to 36.6% in the first
six months of 1996, from 47.4% in 1995 and 36.5% in 1994. This relative decrease
can be  attributed  to a higher than normal  sales  compensation  expense in the
first six months of 1995 due to the acquisition of the Robofax product line from
Applied  System  Engineering  and the hiring of the existing  Robofax sales team
that had been working for Applied  System  Engineering.  Ibex  management  later
decided to reduce the number of salespeople selling the Robofax product.

     General and  Administrative.  General and  administrative  expenses include
compensation for administrative,  finance and general management  personnel,  as
well as other  administrative  expenses,  such as  legal  and  accounting  fees.
General and  administrative  expenses  increased 18.6% to $153,000 for the first
six months of 1996 from $129,000 in the  comparable  period in 1995.  The dollar
increase  resulted  from a move  into  larger  facilities  in May of 1995 and an
increase by one in the number of employees generating general and administrative
expenses.  General and  administrative  expenses,  as a percentage  of net sales
remained  relatively the same,  decreasing slightly from 9.2% in 1995 to 7.4% in
1996.

     Provision  for Income  Taxes.  The provision for income taxes for the first
half of 1996 was $162,000 and ($21,000) for the same period of 1995. The benefit
from  income  taxes in 1995 was a result  of the net loss  realized  during  the
period.

Years Ended December 31, 1995, 1994 and 1993

     Net  Sales.  Net sales  increased  14.1% to $3.1  million in 1995 from $2.7
million in 1994. This increase was  principally  due to increased  marketing and
public  relations  efforts,  including  press  tours  and  expanded  trade  show
schedule. Net sales increased 51.2% in 1994 to $2.7 million from $1.8 million in
1993. This increase was primarily due to increased awareness of fax-on-demand in
the market,  the  introduction  of the FactsLine for Lotus Notes product,  and a
relatively  large sale to Lotus  Development  Corp.  During 1995, 1994 and 1993,
sales to Ibex Europe, Ibex's principal foreign distributor, accounted for 11.7%,
4.1%,  and 7.9%,  respectively,  of Ibex's net sales,  and sales to Ibex Canada,
Ibex's  largest  domestic  distributor,  accounted for 14.2%,  21.1%,  and 3.8%,
respectively, of Ibex's net sales.

     Cost of Sales. Cost of sales as a percentage of net sales was 23.7%, 25.5%,
and 30.9%,  respectively  in 1995, 1994 and 1993. The decrease from 1994 to 1995
was due primarily to a reduction in overhead as a percentage  of net sales.  The
decrease  from 1993  through  1995 has been  primarily  attributed  to increased
volume  purchase  discounts  from  Dialogic  Corporation,  one  of  Ibex's  main
suppliers of components;  increased  sales of add-on  products which have a high
gross margin, and increased sales of software-only  products which do not have a
hardware component included with the product and thus have a high gross margin.


                                       110

<PAGE>



     Research and Development.  Research and development expenses were $648,000,
$432,000  and $245,000 in 1995,  1994 and 1993,  respectively,  and  represented
21.0%, 16.0% and 13.7% of net sales for those period.  During 1995, research and
development  expenses  increased as a  percentage  of net sales as a result of a
$183,000 charge relating to the acquisition of the Robofax product line. Without
this charge,  research and development  would have been $465,000 or 15.0% of net
sales in 1995. The increase from 1993 to 1994 was primarily  attributable  to an
increase in headcount.

     Sales and Marketing.  Sales and marketing expenses were $1.4 million,  $1.0
million, and $638,000 in 1995, 1994, 1993, respectively,  and represented 45.0%,
36.5% and 35.6% of net sales for those  periods.  The increase from 1994 to 1995
was primarily  due to an increase in the sales force,  both via hire and via the
acquisition of the Robofax  product line and the subsequent  hire of the Robofax
sales team.  The trade show  schedule and trade show expenses were also expanded
in 1995.

     General  and  Administrative.  General  and  administrative  expenses  were
$262,000,  $256,000  and $289,000 in 1995,  1994,  and 1993,  respectively,  and
represented 8.4%, 9.4% and 16.2% of net sales for those periods.

     Provision for Income Taxes. See Note 9 of Notes to Financial Statements for
a discussion of Ibex's provision for income taxes.

Liquidity and Capital Resources

     Since its  inception  in 1990,  Ibex has  funded its  operations  primarily
through private  issuances of capital stock and bank borrowings.  Net cash flows
from  operations  were  approximately  $192,000  and  119,000  in 1995 and 1994,
respectively,  and  $221,000  for the first six  months of 1996.  Ibex  acquired
capital  equipment  with an aggregate  purchase  price of $46,000 and $54,000 in
1995 and 1994, respectively, and $30,000 in the first six months of 1996.

                        IBEX STOCK, OPTIONS AND DIVIDENDS

     Ibex is a privately-held company; there is no public trading market for its
stock.  There are a total of 29 holders of Ibex Capital Stock,  of which 28 hold
shares of Ibex Common Stock.  The Castelle Common Stock issued to the holders of
Ibex capital stock in the Merger will be registered pursuant to the Registration
Statement on Form S-4 of which this Prospectus/Joint  Proxy Statement is a part.
In addition,  as of the Ibex Record  Date,  there were  options  outstanding  to
purchase an aggregate of 14,429 shares of Ibex Common Stock.

     Ibex has never  declared or paid any  dividends on its Common Stock and has
no  plans  to do so in the  foreseeable  future.  Ibex's  bank  line  of  credit
prohibits the payment of cash dividends.


                                       111

<PAGE>



                         CASTELLE SECURITY OWNERSHIP OF
                    CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     The following table sets forth certain information  regarding the ownership
of  Castelle's  Common  Stock as of August 31,  1996 by: (i) each  director  and
nominee for director;  (ii) each of the executive  officers named in the Summary
Compensation  Table  employed by Castelle in that  capacity on August 31,  1996;
(iii) all executive  officers and directors of Castelle as a group; and (iv) all
those known by Castelle to be beneficial owners of more than five percent of its
Common Stock.

                                                       Beneficial Ownership
                                                               (1)

                                                    Number             Percent
 Beneficial Owner                                  of Shares           of Total
- -----------------                                  ---------           -------
Entities Affiliated with                            959,348             26.49%
  Hambrecht & Quist Group (2)
  One Bush Street
  18th Floor
  San Francisco, CA 94104

Entities Affiliated with                            386,454             10.67%
  Bay Partners (3)
  10600 North DeAnza Blvd.
  Suite 100
  Cupertino, CA 95014

Entities Affiliated with                            352,568              9.74%
  J.F. Shea Co, Inc. (4)
  655 Brea Canyon Road
  Walnut, CA 91789

Entities Affiliated with                            211,543              5.84%
  Asset Management Associates 1984 (5)
  2275 East Bayshore Road
  Suite 150
  Palo Alto, CA 94303

Arthur H. Bruno (6)                                 137,250              3.79%
  c/o Castelle
  3255-3 Scott Boulevard
  Santa Clara, CA 95054

Randall I. Bambrough (7)                              9,668                  *

Jerome J. Burke (8)                                  76,565              2.03%

John Freidenrich (9)                                396,953             10.96%

William R. Hambrecht (2)                            959,348             26.49%

Alan Kessman (10)                                     5,058                  *

Kanwal S. Rekhi (11)                                 10,691                  *


                                       112

<PAGE>





Delbert W. Yocam (12)                                10,692                  *

All directors and executive officers as a group   1,603,765             43.91%
(8 persons) (2)(3)(6)(7)(8)(9)(10)(11)(12)



* Less than one percent.

(1)  This table is based upon  information  supplied by officers,  directors and
     principal  shareholders and Schedules 13D and 13G filed with the Securities
     and Exchange  Commission  (the "SEC").  Unless  otherwise  indicated in the
     footnotes  to this  table and  subject  to  community  property  laws where
     applicable,  Castelle believes that each of the shareholders  named in this
     table has sole  voting  and  investment  power  with  respect to the shares
     indicated  as  beneficially  owned.  Applicable  percentages  are  based on
     3,620,907  shares  outstanding on August 31, 1996,  adjusted as required by
     rules promulgated by the SEC.

(2)  Includes  60,835 shares held by each of H & Q Ventures  International  C.V.
     and H & Q Ventures IV, 338,480 shares (and warrants  exercisable  within 60
     days for 16,666 shares) held by H & Q London Ventures, 1,250 shares held by
     Hamquist,  832  shares  held by  Hambrecht  &  Quist  Venture  Partners,  a
     California  Limited  Partnership,  182,517  shares  held  by  Ivory  & Sime
     Enterprise  Capital PLC, 85,536 shares (and warrants  exercisable within 60
     days for 16,666 shares) held by Hambrecht & Quist Group, 11,893 shares held
     by Hamco Capital  Corporation,  33,339  shares held by the  Hambrecht  1980
     Revocable  Trust,  and 499  shares  of  Common  stock  subject  to  options
     exercisable  within  60 days of  August  31,  1996  by  William  Hambrecht,
     warrants  exercisable  within 60 days for 70,000 shares held by Hambrecht &
     Quist Liquidating  Trust,  warrants  exercisable  within 60 days for 30,000
     shares held by Guaranty Finance  Management Corp. and warrants  exercisable
     within 60 days for  50,000  shares  held by RVR  Securities.  Each of H & Q
     London Ventures and Ivory & Sime Enterprise  Capital plc owns 5% or more of
     the outstanding shares of Common Stock. William R. Hambrecht, a director of
     Castelle,  is Chairman of  Hambrecht & Quist Group,  the parent  company of
     Hambrecht & Quist LLC. and RvR Securities Corp., one of the Underwriters of
     this offering.  Mr. Hambrecht disclaims  beneficial ownership of the shares
     held by entities  affiliated  with  Hambrecht & Quist Group,  except to the
     extent of his proportionate beneficial interest therein.

(3)  Includes 15,453 shares held by California BPIV,  L.P.,  193,231 shares held
     by Bay Partners III and 177,770 shares held by Bay Partners IV. Each of Bay
     Partners III and Bay Partners IV owns 5% or more of the outstanding  shares
     of Castelle's Common Stock. John Freidenrich,  a director of Castelle,  and
     John Bosch are  general  partners  of  California  BPIV,  L.P.,  and of Bay
     Management  Company,  L.P. and Bay Management Company IV, L.P., the general
     partners of Bay Partners III and Bay Partners IV. Neal Dempsey is a general
     partner of California  BPIV,  L.P. and Bay  Management  Company IV, L.P. In
     such capacities,  Messrs. Bosch, Dempsey and Freidenrich have shared voting
     and  investment  power  over  shares of  Castelle's  Common  Stock  held by
     California BP IV, L.P., Bay Partners III and Bay Partners IV. They disclaim
     beneficial  ownership  as to these  shares,  except to the  extent of their
     respective pecuniary interests therein.

(4)  The  shareholders  of J.F. Shea Co., Inc. are Edmund H. Shea,  Jr., John F.
     Shea and Peter O. Shea,  who disclaim  beneficial  ownership of  Castelle's
     shares  except to the extent of each  individual's  proportionate  interest
     therein.  Also includes 50,000 held by Edmund M. Shea, Jr. and Mary S. Shea
     as trustees for the E&M RP Trust.

                                       113

<PAGE>




(5)  Includes 108,633 shares held by Asset Management  Associates 1984, L.P. and
     102,910 shares held by Asset  Management  Associates  1989, L.P., which are
     beneficially  owned by John Shoch,  Franklin P.  Johnson,  Jr. and Craig C.
     Taylor,  the general  partners of AMC Partners 84 and AMC Partners 89 L.P.,
     the general partners, respectively, of Asset Management Associates 1984 and
     Asset Management  Associates 1989, L.P. Messrs.  Shoch,  Johnson and Taylor
     disclaim such  beneficial  ownership  except to the extent of each person's
     proportionate beneficial interest therein.

(6)  Chairman of the Board, Chief Executive Officer, President and a Director of
     Castelle. Includes 5,000 shares of Common Stock held by Mr. Bruno's wife.

(7)  Includes 7,968 shares of Common stock subject to options exercisable within
     60 days of August 30,  1996 and 200 shares  held by Randall I.  Bambrough's
     daughter.  Mr. Bambrough is the Chief Financial Officer,  Vice President of
     Finance and Administration, and Secretary of Castelle.

(8)  Executive  Vice  President  of  Castelle.  Includes  500 shares held by Mr.
     Burke's spouse.

(9)  Includes 15,453 shares held by California BP IV, L.P.,  193,231 shares held
     by Bay Partners III and 177,770 shares held by Bay Partners IV. Each of Bay
     Partners III and Bay Partners IV owns 5% or more of the outstanding  shares
     of Castelle's Common Stock. John Freidenrich,  a director of Castelle,  and
     general  partner of California BP IV, L.P. and of Bay  Management  Company,
     L.P.  and Bay  Management  Company IV,  L.P.,  the general  partners of Bay
     Partners  III and Bay  Partners IV. Mr.  Friedenrich  disclaims  beneficial
     ownership  as to these  shares,  except to the  extent of their  respective
     pecuniary  interests  therein.  Also  includes  10,000  shares  held by the
     Friedenrich  Family Trust and 499 shares of Common Stock subject to options
     exercisable within 60 days of August 31, 1996.

(10) Includes 499 shares of Common stock subject to options  exercisable  within
     60 days of August 31, 1996.

(11) Includes  10,961  shares of Common  stock  subject to  options  exercisable
     within 60 days of August 31, 1996.

(12) Includes  10,962  shares of Common  stock  subject to  options  exercisable
     within 60 days of August 31, 1996.

Compliance with the Reporting Requirements of Section 16(a)

     Section  16(a) of the  Securities  Exchange  Act of 1934 (the  "1934  Act")
requires Castelle's  directors and executive officers,  and persons who own more
than ten percent of a registered class of Castelle's equity securities,  to file
with the SEC initial reports of ownership and reports of changes in ownership of
Common Stock and other equity  securities of Castelle.  Officers,  directors and
greater than ten percent  shareholders are required by SEC regulation to furnish
Castelle with copies of all Section 16(a) forms they file.


                                       114

<PAGE>



     To  Castelle's  knowledge,  based  solely on a review of the copies of such
reports furnished to Castelle and written  representations that no other reports
were required, during the fiscal year ended December 31, 1995, all Section 16(a)
filing requirements  applicable to its officers,  directors and greater than ten
percent  beneficial  owners were complied with except that an initial  report of
ownership was filed late by J.F. Shea Co., Inc.


                                       115

<PAGE>



                           IBEX SECURITY OWNERSHIP OF
                      PRINCIPAL SHAREHOLDERS AND MANAGEMENT

     The following  table sets forth certain  information  regarding  beneficial
ownership of Ibex Common Stock and Ibex Series A Convertible  Preferred Stock as
of August 30, 1996 (i) by each  person  known by Ibex to own  beneficially  more
than 5% of the  outstanding  shares of Ibex Common  Stock or more than 5% of the
outstanding shares of Ibex Series A Convertible Preferred Stock, (ii) by each of
the directors and executive  officers of Ibex, and (iii) all of Ibex's directors
and executive officers as a group.

<TABLE>
<CAPTION>

                                                                                   Beneficial Ownership

                                                      Class of          Number of         Percent of       Percent of
Name of Person or Identity of Group(1)                Securities        Shares(2)          Class(3)        Total Shares
                                                      ----------        ---------          --------        ------------

<S>                                                   <C>                 <C>                <C>              <C>  
Tucha Limited (4)                                     Preferred           24,017             50.0%            12.7%
c/o Tecom Sistemas                                    Common               1,000              0.7%             0.5%
Rua Jeronimo de Lemos 162 or 152
Rio de Janeiro, RJ
20560-090 Brazil


Newark Holding, S.A. (4)                              Preferred           24,018             50.0%            12.7%
c/o Tecom Sistemas
Rua Jeronimo de Lemos 162 or 152
Rio de Janeiro, RJ
20560-090 Brazil

Grant Family 1990 Revocable Trust                     Common               7,600              5.5%             4.0%
1242 Hagan Road
Napa, CA 94558

Clovis Mattos                                         Common              11,000              8.0%             5.8%
1775 Rehrman Drive
Dixon, CA 95620

Ney Grant (5)                                         Common              55,000             39.9%            29.1%

Curtis Powell (6)                                     Common              30,000             21.3%            15.9%

Graeme Plant (7)                                      Common               2,086              1.5%             1.1%

Teodoro Gimenez (8)                                   Preferred           48,035            100.0%            25.8%
                                                      Common              1,000               0.7%             0.5%

All Current Directors and                             Preferred           48,035            100.0%            25.4%
Executive Officers                                    Common              88,086             62.5%            46.6%
(7 persons)
</TABLE>


(1)  Except as  indicated by footnote,  and subject to community  property  laws
     where applicable, the persons named in the table above have sole voting and
     investment  power with respect to all shares of Common Stock and  Preferred
     Stock shown as beneficially owned by them.


                                       116

<PAGE>



(2)  Beneficial  ownership is  determined  in  accordance  with the rules of the
     Securities  Exchange Commission and generally includes voting or investment
     power  with  respect  to  securities.  Shares of Common  Stock  subject  to
     options,   warrants  and  convertible   notes   currently   exercisable  or
     convertible,  or  exercisable  or  convertible  within 60 days,  are deemed
     outstanding  including  for purposes of  computing  the  percentage  of the
     person  holding  such  option,  but  not  for  purposes  of  computing  the
     percentage of any other holder.

(3)  Computed  on the basis of 141,016  shares of Ibex  Common  Stock and 48,035
     shares of Ibex Series A Preferred  Stock  outstanding  or for which Ibex is
     contractually obligated to issue.

(4)  Teodoro Gimenez,  a director of Ibex, is Managing Director of Tucha Limited
     and  Managing  Director  of Newark  Holding,  S.A.  Mr.  Gimenez  disclaims
     beneficial  ownership except to the extent of his proportionate  beneficial
     interest therein.

(5)  Chairman of the Board and President.

(6)  Vice President of Development and Director.

(7)  Director.

(8)  Teodoro Gimenez,  a director of Ibex, is Managing Director of Tucha Limited
     and  Managing  Director  of Newark  Holding,  S.A.  Mr.  Gimenez  disclaims
     beneficial  ownership except to the extent of his proportionate  beneficial
     interest therein.


                                       117

<PAGE>



                              CERTAIN TRANSACTIONS

Stock Purchase by Executive Officers of Castelle

     Arthur H. Bruno, Chairman of the Board, Chief Executive Officer,  President
and a director of Castelle,  purchased 97,250 shares of Castelle's  Common Stock
at $0.20 per share in  October  1994 and  purchased  35,000  shares at $5.00 per
share in April 1995. The shares are subject to a right of repurchase in favor of
Castelle which expires  ratably over four years and which are exercisable if Mr.
Bruno's relationship with Castelle terminates.

     Jerome J. Burke,  Executive  Vice President of Castelle,  purchased  55,565
shares  of  Castelle's  Common  Stock at $0.20  per  share in  October  1994 and
purchased 17,500 shares at $5.00 per share in April 1995. The shares are subject
to a right of  repurchase in favor of Castelle  which expires  ratably over four
years  and which are  exercisable  if Mr.  Burke's  relationship  with  Castelle
terminates.

Castelle Director and Shareholder Affiliations with Underwriter

     RvR Securities Corp., a wholly-owned subsidiary of Hambrecht & Quist Group,
was  one of the  underwriters  in  Castelle's  initial  public  offering,  which
occurred in December 1995. Persons affiliated and associated with RvR Securities
Corp.   beneficially  own  an  aggregate  of  approximately  908,847  shares  of
Castelle's  Common  Stock.  In  addition,  William R.  Hambrecht,  a Director of
Castelle, is Chairman of Hambrecht & Quist Group.

     Because of these  affiliations,  Castelle's  initial  public  offering  was
conducted in  accordance  with the  applicable  provisions  of Schedule E to the
By-Laws of the National  Association  of  Securities  Dealers Inc. In accordance
with those provisions,  Unterberg Harris (the "Independent  Underwriter") served
as a "qualified  independent  underwriter"  and recommended the maximum offering
price for the shares of Common Stock sold in the  offering.  The initial  public
offering  price of the shares of Common  Stock was not higher  than the  maximum
public offering price recommended by the Independent Underwriter which performed
due diligence  with respect to the  information  contained in the prospectus and
participated  in the  preparation  of the  registration  statement  of which the
prospectus was a part.

     Castelle sold RvR Securities Corp. warrants to purchase from Castelle up to
50,000  shares  of Common  Stock at an  exercise  price per share of $8.40.  The
warrant is  exercisable  for a period of five years  beginning  on December  20,
1995.  The  warrant is  transferable,  subject  to  compliance  with  applicable
securities  laws,  provided  that  until  December  21,  1996 the  warrants  are
transferable  only to another  underwriter in the initial public  offering or to
officers or partners of an  underwriter  in the  initial  public  offering.  The
warrant  contains  provisions for appropriate  adjustments in the event of stock
splits, stock dividends, combinations,  reorganizations or recapitalizations. In
addition,  Castelle  granted  certain  rights to the  holder of the  warrant  to
register the underlying Common Stock.

                                       118

<PAGE>



            COMPARISON OF RIGHTS OF SHAREHOLDERS OF CASTELLE AND IBEX

     Castelle and Ibex are incorporated in the State of California.  Pursuant to
the  Merger,  Ibex will be  merged  with and into  Castelle  and  Castelle  will
continue  to be  governed  by the  California  Law.  The  rights  of  Castelle's
shareholders  are  governed  by its  Articles of  Incorporation,  as amended and
restated  (the  "Castelle  Articles"),  its  Bylaws,  as  amended  and  restated
("Castelle  Bylaws"),  and the California Law. The rights of Ibex's shareholders
are governed by the Ibex Articles of  Incorporation  (the "Ibex  Articles")  its
Bylaws ("Ibex  ByLaws") and the California  Law. After the effective time of the
Merger, the rights of Ibex shareholders who become Castelle shareholders will be
governed by the Castelle  Articles,  Castelle Bylaws and the California Law. The
following is a summary comparison of certain  differences  between the rights of
Castelle  shareholders  under the Castelle  Articles and Castelle Bylaws and the
rights  of Ibex  shareholders  under the Ibex  Articles  and Ibex  Bylaws.  This
summary  does not purport to be complete  and is  qualified  in its  entirety by
reference to the corporate statute of California, and the corporate charters and
bylaws of Castelle and Ibex.

     Rights  under the  Castelle  and Ibex  Articles.  The  rights of holders of
common stock under the Castelle and Ibex Articles are substantially similar.

     Both the Castelle Articles and the Ibex Articles provide that the liability
of  directors  for  monetary   damages  be  eliminated  to  the  fullest  extent
permissible  under  California law and that agents be indemnified  for breach of
duty to the company,  subject to the limits on such indemnification set forth in
Section 204 of the California Corporations Code.

     The Castelle Articles provide for the issuance by the Board of Directors of
up to 2,000,000  shares of Preferred Stock in one or more series,  and authorize
the Board of  Directors  to  determine  the rights of holders of such  series of
Preferred Stock.

     Holders of Ibex Preferred  Stock are entitled to separate  rights under the
Ibex Articles,  however such rights shall expire as of the effective time of the
Merger.

     Rights  Under the  Castelle  and Ibex  Bylaws.  The  rights of  holders  of
Castelle and Ibex stock are  substantially  similar  under the Castelle and Ibex
Bylaws  and  include  the right to one vote per share of  Common  Stock  held on
matters brought before the  shareholders,  other than the election of directors,
in which  shareholders may cumulate votes. Among the differences in the Castelle
and  Ibex  Bylaws  are the  provisions  relating  to the  size of the  Board  of
Directors.  The  Castelle  Board of  Directors  is comprised of between four and
seven  individuals and the Ibex Board of Directors is comprised of three to five
individuals. In each case the actual number of directors is fixed by approval of
either a vote of the Board of Directors or the shareholders.


                                       119

<PAGE>



          ADDITIONAL MATTERS FOR CONSIDERATION OF CASTELLE SHAREHOLDERS

                                   PROPOSAL 2

Election of Directors

     There  are five (5)  nominees  for the five (5) Board  positions  presently
authorized  in Castelle's  Bylaws.  Each director to be elected will hold office
until the next annual meeting of shareholders and until his successor is elected
and has  qualified,  or until such  director's  earlier  death,  resignation  or
removal. Each nominee listed below is currently a director of Castelle, and five
directors,  Messrs. Bruno,  Freidenrich,  Kessman,  Rekhi and Yocam, having been
elected by the Board.

     Shares represented by executed proxies will be voted, if authority to do so
is not withhold,  for the election of the five (5) nominees named below, subject
to the  discretionary  power to  cumulate  votes.  In the event that any nominee
should be unavailable for election as a result of an unexpected occurrence, such
shares will be voted for the election of such  substitute  nominee as management
may propose.  Each person  nominated for election has agreed to serve if elected
and  management  has no reason to  believe  that any  nominee  will be unable to
serve.

     The five candidates  receiving the highest number of affirmative votes cast
at the meeting will be elected directors of Castelle.

                        THE BOARD OF DIRECTORS RECOMMENDS
                      A VOTE IN FAVOR OF EACH NAMED NOMINEE

     Nominees

     The names of the nominees and certain  information about them are set forth
below:

<TABLE>
<CAPTION>

              NAME                       AGE                      PRINCIPAL OCCUPATION/
                                                               POSITION HELD WITH CASTELLE

<S>                                      <C>                                                       
Arthur H. Bruno                          61         Chairman of the Board, Chief Executive Officer,
                                                    President and Director
John Freidenrich (1)                     59         General Partner, Bay Management Company
Alan Kessman (2)                         49         Chairman of the Board, President and Chief Execu-
                                                    tive Officer of Executone Information Systems, Inc.
Kanwal S. Rekhi (1)                      49         Director
Delbert W. Yocam (2)                     52         Director

</TABLE>


(1)  Member of Compensation Committee of the Board of Directors.
(2)  Member of Audit Committee of the Board of Directors.

     Arthur H. Bruno has served as Castelle's Chairman,  Chief Executive Officer
and President  since October 1993.  From 1991 to 1993, he was Chairman and Chief
Executive Officer of White Pine Software Inc., a desktop  connectivity  company.
From 1989 to 1991, he was the Chairman and Chief  Executive  Officer of Wellsley

                                      120
<PAGE>

Medical Management  Corporation,  a primary care medical service provider.  From
1986 to  1989,  he was the  Chairman  and  Chief  Executive  Officer  of  Visual
Technology Incorporated, the predecessor to White Pine Software Inc.

     John  Freidenrich  has served as a director of Castelle since January 1994.
Since 1981, he has been a general partner of various entities established by Bay
Partners,  a venture  capital  group.  Currently,  Mr.  Freidenrich is a general
partner of Bay  Management  and Bay  Management  Company IV,  L.P.,  the general
partner of Bay Partners III, L.P. and Bay Partners IV, L.P.,  respectively.  Mr.
Freidenrich  was also a partner  in, or of  counsel  to, the law firms of Ware &
Freidenrich or Gray, Cary, Ware & Freidenrich from January 1987 through December
1991.

     Alan Kessman has served as a director of Castelle  since April 1992. He has
also served as Chairman of the Board, President,  and Chief Executive Officer of
Executone Information Systems, Inc., a telecommunications  company, since August
1983.

     Kanwal S. Rekhi has served as a director  of  Castelle  since  April  1995.
Currently retired,  Mr. Rekhi served as Executive Vice President of Novell, Inc.
from June 1989 through January 1995. Mr. Rekhi currently serves as a director of
Gupta Corporation.

     Delbert W. Yocam has been a director  of Castelle  since  April  1995.  Mr.
Yocam has been an independent  consultant from November 1994 to the present. Mr.
Yocam was President,  Chief Operating Officer and a director of Tektronix,  Inc.
from September 1992 through November 1994. He was an independent consultant from
November 1989 until September 1992. Mr. Yocam was with Apple Computer, Inc. from
November  1979  through  November  1989,  serving  in  a  variety  of  executive
management positions, including Chief Operating Officer from August 1986 through
August 1988 and  President of Apple  Pacific from August 1988 to November  1989.
Mr.  Yocam is also a director of Adobe  Systems,  Inc.,  Integrated  Measurement
Systems,  Inc., Oracle  Corporation,  Sapiens  International  Corp., and several
privately-held technology companies.

     Retiring Director

     Hambrecht & Quist Group maintains a policy that persons acting as directors
for private  companies  withdraw from such  positions,  within a reasonable time
after the company  becomes  publicly  traded.  Accordingly,  Mr.  Hambrecht  has
indicated  that he does not wish to be nominated  for  reelection  to Castelle's
Board of  Directors  and will cease to be a  director  of the  Company  upon the
conclusion of the Castelle Meeting.

     Board Committees and Meetings

     During the fiscal year ended December 31, 1995, the Board of Directors held
six meetings. The Board has an Audit Committee and a Compensation Committee.

     The Audit  Committee meets with  Castelle's  independent  auditors at least
annually  to review the results of the annual  audit and  discuss the  financial
statements; recommends to the Board the independent auditors to be retained; and
receives and considers  the  accountants'  comments as to controls,  adequacy of
staff and management  performance  and  procedures in connection  with audit and
financial  controls.  The  Audit  Committee  is  composed  of  two  non-employee
directors: Messrs. Kessman and Yocam. The Audit Committee was formed in November
1995 in  anticipation  of Castelle's  initial  public  offering and did not meet
during 1995.

                                       121

<PAGE>




     The Compensation  Committee makes  recommendations  concerning salaries and
incentive compensation,  awards stock options to employees and consultants under
Castelle's stock option plans and otherwise  determines  compensation levels and
performs such other functions regarding  compensation as the Board may delegate.
The Compensation Committee is composed of three non-employee directors:  Messrs.
Freidenrich,  Hambrecht  and Rekhi.  The  Compensation  Committee  was formed in
November 1995 in anticipation of Castelle's  initial public offering and did not
meet during 1995.

     During the fiscal  year ended  December  31,  1995,  each of the  directors
except Alan  Kessman  attended at least 75% of the  aggregate of the meetings of
the Board held during the period for which he was a director.

                                   PROPOSAL 3

Ratification of Selection of Independent Auditors

     The Board of Directors has selected  Coopers & Lybrand L.L.P. as Castelle's
independent  auditors  for the fiscal  year  ending  December  31,  1996 and has
further  directed that management  submit the selection of independent  auditors
for  ratification by the  shareholders at the Annual Meeting.  Coopers & Lybrand
L.L.P. has audited Castelle's  financial statements since its inception in 1987.
Representatives  of Coopers & Lybrand  L.L.P.  are expected to be present at the
Annual  Meeting,  will have an opportunity to make a statement if they so desire
and will be available to respond to appropriate questions.

     Shareholder  ratification  of the selection of Coopers & Lybrand L.L.P.  as
Castelle's  independent  auditors  is  not  required  by  Castelle's  Bylaws  or
otherwise.  However,  the Board is submitting the selection of Coopers & Lybrand
L.L.P.  to the  shareholders  for  ratification  as a matter  of good  corporate
practice. If the shareholders fail to ratify the selection,  the Audit Committee
and the Board will  reconsider  whether or not to retain that firm.  Even if the
selection is ratified, the Audit Committee and the Board in their discretion may
direct the appointment of different  independent auditors at any time during the
year if they  determine  that such a change  would be in the best  interests  of
Castelle and its shareholders.

     The affirmative  vote of the holders of a majority of the shares present in
person or represented by proxy and voting at the Annual Meeting will be required
to ratify the selection of Coopers & Lybrand L.L.P.

                        THE BOARD OF DIRECTORS RECOMMENDS
                        A VOTE IN FAVOR OF THIS PROPOSAL


                                       122

<PAGE>



            ADDITIONAL MATTER FOR CONSIDERATION OF IBEX SHAREHOLDERS

                                   PROPOSAL 2

Approval of the 1992 Stock Option Plan

     In July 1996,  the Board of  Directors  adopted and  ratified the Ibex 1992
Stock Option Plan (the "1992 Option  Plan").  There are 20,000  shares of Ibex's
common Stock  authorized  for issuance under the 1992 Option Plan. At August 31,
1996,  options  (net of canceled or expired  options)  covering an  aggregate of
14,429  shares of Ibex's  Common  Stock were  outstanding  under the 1992 Option
Plan.

                        THE BOARD OF DIRECTORS RECOMMENDS
                          A VOTE IN FAVOR OF PROPOSAL 2

     The essential features of the 1992 Option Plan are outlined below:

     General

     The  1992  Option  Plan  provides  for  the  grant  of both  incentive  and
nonstatutory  stock  options.  Incentive  stock  options  granted under the 1992
Option Plan are  intended to qualify as  "incentive  stock  options"  within the
meaning of Section 422 of the  Internal  Revenue  Code of 1986,  as amended (the
"Code").  Nonstatutory  stock options granted under the 1992 Option Plan are not
intended to qualify as incentive stock options under the Code.

     Purpose

     The 1992  Option  Plan was  adopted  to  provide a means by which  selected
officers,  directors and employees of and consultants to Ibex and its affiliates
could be given an  opportunity to purchase stock in Ibex, to assist in retaining
the  services  of  employees  holding  key  positions,  to secure and retain the
services of persons capable of filling such positions and to promote the success
of Ibex's business.

     Administration

     The 1992 Option Plan is administered by the Board of Directors of Ibex. The
Board has the power to construe  and  interpret  the 1992 Option Plan subject to
the provisions of the 1992 Option Plan and determine the persons to whom and the
dates on which  options  will be granted,  the number of shares to be subject to
each option,  the time or times during the term of each option  within which all
or a portion of such options may be exercised,  the exercise price,  the type of
consideration  and  other  terms  of the  option.  The  Board  of  Directors  is
authorized  to  delegate  administration  of the 1992 Option Plan to a committee
composed of not fewer than three members of the Board.

     Eligibility

     Incentive  stock  options may be granted under the 1992 Option Plan only to
employees  (including  officers  and   employee-directors)  of  Ibex.  Employees
(including officers and non-employee  directors),  consultants are also eligible
to receive nonstatutory stock options under the 1992 Option Plan.


                                       123

<PAGE>



     No option may be granted  under the 1992  Option Plan to any person who, at
the time of the grant, owns (or is deemed to own) stock possessing more than 10%
of the total combined voting power of Ibex or any affiliate of Ibex,  unless the
option  exercise  price is at least 110% of the fair  market  value of the stock
subject to the option on the date of grant,  and the term of the option does not
exceed five years from the date of grant.  For incentive  stock options  granted
under the 1992 Option Plan, the aggregate  fair market value,  determined at the
time of grant,  of the shares of Common Stock with respect to which such options
are  exercisable  for the first time by an  optionee  during any  calendar  year
(under all such plans of Ibex and its affiliates) may not exceed $100,000.

     Terms of Options

     The following is a description of the permissible  terms of options granted
under the 1992 Option Plan.  Individual option grants may be more restrictive as
to any or all of the permissible terms described below.

     Exercise  Price;  Payment.  The exercises  price of incentive stock options
under the 1992  Option  Plan may not be less than the fair  market  value of the
Common Stock subject to the option on the date of the option grant,  and in some
cases (see  "Eligibility"  above), may not be less than 110% of such fair market
value. The exercise price of nonstatutory options under the 1992 Option Plan may
not be less than 85% of the fair market value of the Common Stock subject to the
option on the date of the option grant.  The exercise  price of options  granted
under  the 1992  Option  Plan  must be paid in cash at the time  the  option  is
exercised, unless payment in some other manner is authorized by the Board at the
time of grant of the stock option.

     Option  Exercise.  Options  granted  under the 1992 Option Plan may vest in
cumulative  increments as determined by the Board.  Shares  covered by currently
outstanding options under the 1992 Option Plan typically vest at the rate of 1/3
of the shares subject to the option at the end of the first year after the grant
and 1/3 per year  thereafter  during  the  optionee's  continued  employment  or
service as a consultant.

     Term.  The maximum term of options  under the 1992 Option Plan is 10 years,
except that in certain cases (see "Eligibility") the maximum term is five years.

     Exercise of Option.  If the optionee's  employment  with Ibex is terminated
for any reason (other than death or total and permanent disability), options may
be  exercised  within 90 days  after such  termination  as to all or part of the
shares as to which the optionee was entitled at the date of such termination. If
an optionee is unable to continue his or her employment with Ibex as a result of
death,  his or her options may be exercised at any time prior to the  expiration
of the option by the optionee's  estate or by a person who acquired the right to
exercise  the option by bequest  or  inheritance,  but only to the extent of the
accrued  right to  exercise  at the time of death.  If an  optionee is unable to
continue  his or her  employment  with Ibex as a result  of total and  permanent
disability, his or her options may be exercised at any time within twelve months
after  termination  to the  extent the  option  was  exercisable  on the date of
termination.

     Adjustment Provisions

     If there is any change in the Common Stock  subject to the 1992 Option Plan
or subject to any option  granted  under the 1992 Option Plan  (through  merger,
consolidation,  reorganization,  recapitalization,  stock dividend,  dividend in
property  other than cash,  stock split,  liquidating  dividend,  combination of
shares,  exchange of shares,  change in corporate  structure or otherwise),  the
1992  Option  Plan and  options  outstanding  thereunder  will be  appropriately

                                      124
<PAGE>

adjusted  as to the class and the maximum  number of shares  subject to the 1992
Option  Plan and the  class,  number of shares and  exercise  price per share of
Common Stock subject to such outstanding options.

     Effect of Certain Corporate Events

     Unless  otherwise   determined  by  the  Board,  upon  the  dissolution  or
liquidation  of Ibex the  options  granted  under  the 1992  Option  Plan  shall
terminate and thereupon  become null and void.  Each optionee shall be given not
less than ten (10) days  notice of such event and the  opportunity  to  exercise
each  outstanding  option  before  such  event is  effected.  Upon any merger or
consolidation,  if Ibex is not the surviving  corporation,  the options  granted
under the 1992  Option  Plan shall  either be assumed by the new entity or shall
terminate as set forth above.

     Duration, Amendment and Termination

     The Board may suspend or terminate the 1992 Option Plan without stockholder
approval  or  ratification  at any  time or from  time to  time.  Unless  sooner
terminated,  the 1992 Option Plan will  terminate ten years from its adoption by
the Board.  The Board may amend or  terminate  the 1992 Option Plan from time to
time in such  respects as the Board may deem  advisable,  except  that,  without
approval of the holders of a majority of the  outstanding  capital stock no such
revision  or  amendment  shall  change the number of shares  subject to the 1992
Option  Plan,  change the  designation  of the class of  employees  eligible  to
receive  options or add any material  benefit to optionees under the 1992 Option
Plan. Any such amendment or termination of the 1992 Option Plan shall not affect
options already granted,  and such options shall remain in full force and effect
as if the 1992 Option Plan had not been amended or terminated.

     Restrictions on Transfer

     Under  the 1992  Option  Plan,  an  option  may not be  transferred  by the
optionee  otherwise  than by will or by the laws of  descent  and  distribution.
During the  lifetime  of an  optionee,  an option may be  exercised  only by the
optionee.

     Tax Consequences

     Nonstatutory Stock Options. All options granted under the 1992 Stock Option
Plan,  to date have been  nonstatutory  stock  options  and  generally  have the
following federal income tax consequences.

     There  are no tax  consequences  to the  optionee  or Ibex by reason of the
grant of a  nonstatutory  stock option.  Upon exercise of a  nonstatutory  stock
option,  the optionee  normally will recognize  taxable ordinary income equal to
the excess of the fair market value of Ibex Common Stock on the date of exercise
over the option exercise price.  Generally,  with respect to employees,  Ibex is
required to withhold from regular wages or supplemental  wage payments an amount
based on the ordinary income so recognized. Ibex will generally be entitled to a
business expense  deduction equal to the taxable ordinary income realized by the
optionee.  Upon disposition of the shares, the optionee will recognize a gain or
loss equal to the  difference  between the sales price and the purchase price of
the  shares  (plus any  compensation  income  recognized  with  respect  to such
shares).


                                       125

<PAGE>



                              SHAREHOLDER PROPOSALS

     Shareholder  proposals  for inclusion in the Castelle  proxy  statement and
form of proxy relating to the Castelle 1997 Annual Meeting of Shareholders  must
be received by Castelle at its  principal  executive  offices by June 9, 1997 in
order that they may be considered for inclusion in the proxy  statement and form
of proxy relating to that meeting.

                                     EXPERTS

     The consolidated  financial  statements of Castelle as of December 31, 1994
and 1995,  and for each of the three years in the period ended December 31, 1995
included  elsewhere in this Prospectus have been included herein, in reliance on
the report of Coopers & Lybrand L.L.P., independent accountants, which report is
given upon the authority of that firm as experts in accounting and auditing.

     The financial  statements of Ibex as of December 31, 1994 and 1995, and for
each of the two years in the period ended December 31, 1995,  included elsewhere
in this  Prospectus  have been  included  herein in  reliance  on the  report of
Coopers & Lybrand L.L.P.,  independent  accountants,  which report is given upon
the authority of that firm as experts in accounting and auditing.

                                  LEGAL MATTERS

     The  validity of the shares of Common Stock  offered  hereby will be passed
upon for  Castelle by Cooley  Godward LLP, San  Francisco,  California.  Certain
legal  matters in  connection  with the Merger  will be passed  upon for Ibex by
Graham & James LLP,  Sacramento,  California.  Gilles S. Attia, a partner of the
law firm of Graham & James LLP, holds the office of Secretary of Ibex.


                                       126

<PAGE>



                                  OTHER MATTERS

Castelle

     The  Castelle  Board of  Directors  knows of no other  matters that will be
presented  for  consideration  at the Annual  Meeting.  If any other matters are
properly brought before the meeting, it is the intention of the persons named in
the  accompanying  proxy to vote on such matters in  accordance  with their best
judgment.

                       By Order of the Board of Directors


                                                     Randall I. Bambrough
                                                     Secretary

November 7, 1996

     A copy of the  Company's  Annual  Report  to the  Securities  and  Exchange
Commission on Form 10-K for the fiscal year ended December 31, 1996 is available
without charge upon written request to: Corporate  Secretary,  Castelle,  3255-3
Scott Boulevard, Santa Clara, CA 95054.

Ibex

     The  Ibex  Board  of  Directors  knows of no  other  matters  that  will be
presented  for  consideration  at the Annual  Meeting.  If any other matters are
properly brought before the meeting, it is the intention of the persons named in
the  accompanying  proxy to vote on such matters in  accordance  with their best
judgment.

                       By Order of the Board of Directors


                                                     Gilles A. Attia
                                                     Secretary

November 7, 1996



                                       127

<PAGE>



                          INDEX TO FINANCIAL STATEMENTS


Castelle Financial  Statements for the three years ended December 31, 1993, 1994
and 1995:

Report of Independent Accountants..........................................F-2

Consolidated Financial Statements..........................................F-3

Notes to Consolidated Financial Statements.................................F-7


Castelle Financial Statements for the six months ended June 28, 1995 and 1996:

Consolidated Financial Statements..........................................F-20 

Notes to Consolidated Financial Statements.................................F-24


Ibex Technologies, Inc. Financial Statements for the two years ended December
31, 1994 and 1995:

Report of Independent Accountants..........................................F-25

Consolidated Financial Statements..........................................F-26

Notes to Consolidated Financial Statements.................................F-30


Ibex Technologies, Inc. Financial Statements for the six months ended June 30,
1994 and 1995:

Consolidated Financial Statements..........................................F-40

Notes to Consolidated Financial Statements.................................F-43

                                      F-1

<PAGE>

                        REPORT OF INDEPENDENT ACCOUNTANTS




To the Board of Directors and
Shareholders of Castelle:

We have audited the  accompanying  consolidated  balance  sheets of Castelle and
subsidiaries  as of  December  31, 1994 and 1995,  and the related  consolidated
statements of  operations,  shareholders'  equity and cash flows for each of the
three years in the period ended December 31, 1995.  These  financial  statements
are the  responsibility of the Company's  management.  Our  responsibility is to
express an opinion on these financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated  financial statements referred to above present
fairly,  in all  material  respects,  the  consolidated  financial  position  of
Castelle and  subsidiaries  as of December 31, 1994 and 1995, and the results of
their  operations and their cash flows for each of the three years in the period
ended  December 31, 1995,  in  conformity  with  generally  accepted  accounting
principles.





COOPERS & LYBRAND L.L.P.



San Jose, California
February 9, 1996


The accompanying notes are an integral part of these financial statements.

                                      F-2
<PAGE>

<TABLE>
<CAPTION>
                                                        
                                    CASTELLE
                           CONSOLIDATED BALANCE SHEETS
                                 (in thousands)
                                      -----



                                                                                   December 31,
                                                                              -----------------------
                               ASSETS                                           1995          1994
                                                                              ---------     ---------

Current assets:
<S>                                                                           <C>           <C>     
Cash and cash equivalents                                                     $  7,268      $    907 
Restricted cash                                                                                  426 
Accounts  receivable,  net of allowance for doubtful accounts of $406                                     
in 1994, and $414 in 1995                                                                                 
                                                                                 2,837         1,873 
Inventories                                                                      3,637         2,735 
Prepaid expenses and other current assets                                          471           297 
Deferred income taxes                                                                             61 
                                                                               --------     ---------
                                                                                                          
                                                                                                          
Total current assets                                                            14,213         6,299 
                                                                                                          
Property and equipment, net                                                        334           667 
Other, net                                                                         120           158 
                                                                               --------     ---------
                                                                                                          
Total assets                                                                  $ 14,667      $  7,124 
                                                                               ========     =========
                                                                                                 
                             LIABILITIES

Current liabilities:
Bank borrowings                                                                             $  1,576 
Long-term debt, current portion                                               $    193         1,094 
Accounts payable                                                                 2,723         1,097 
Accrued liabilities                                                              2,448         1,648 
                                                                               --------     ---------
                                                                                                          
                                                                                                          
Total current liabilities                                                        5,364         5,415 
                                                                                                          
Long-term debt, less current portion                                                 4           270 
Deferred income taxes                                                                             61 
Other long-term liabilities                                                         10            23 
                                                                               --------     ---------
                                                                                                          
                                                                                                          
Total liabilities                                                                5,378         5,769 
                                                                               --------     ---------
                                                                                                          
Commitments (Note 4).                                                                                     
                                                                                                          
                        SHAREHOLDERS' EQUITY                                                              
                                                                                                          
Preferred stock, no par value:                                                                            
Authorized:  30,000 shares in 1994 and 2,000 shares in 1995 and 1996                                      
Issued and outstanding:  22,349 shares in 1994 and no shares in 1995                                      
and 1996                                                                                                  
                                                                                              15,860               
                                                                                                          
                                                                                                          
Common stock, no par value:                                                                               
Authorized:  25,000 shares                                                                                
Issued and outstanding:  453 shares in 1994, 3,469 shares in 1995                                         
and 3,621 shares in 1996                                                                                  
                                                                                22,323           304 
                                                                                                          
                                                                                                          
Notes receivable for purchase of common stock                                     (379)         (130)
Accumulated deficit                                                            (12,655)      (14,679)
                                                                               --------     ---------
                                                                                                          
                                                                                                          
Total shareholders' equity                                                       9,289         1,355 
                                                                               --------     ---------
                                                                                                          
Total liabilities and shareholders' equity                                    $ 14,667      $  7,124 
                                                                               ========     =========
                                                                                                 

</TABLE>


 




The  accompanying  notes are an  integral  part of these  financial  statements.

                                      F-3
<PAGE>
<TABLE>
<CAPTION>
                                                         
                                    CASTELLE
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                      (in thousands, except per share data)



                                                        Years Ended December 31,
                                                   ------------------------------------
                                                     1995         1994          1993
                                                   ---------    ---------     ---------
<S>                                                <C>          <C>           <C>     
Net sales                                         $  25,082     $  19,486     $  17,787   
Cost of sales                                        13,571        11,503        11,346 
                                                   ---------    ---------      --------- 
ross profit                                          11,511         7,983         6,441 
                                                   ---------    ---------      --------- 
                                                                                            
Operating expenses:                                                                         
    Research and development                          2,018        2,179          2,152 
    Sales and marketing                               5,641        4,384          5,628 
    General and administrative                        1,405        1,446          1,977 
    Restructuring charge                                                            615 
                                                    --------    ---------       --------
                                                      9,064        8,009         10,372 
                                                    --------    ---------       --------
Operating  income (loss)                              2,447          (26)        (3,931)
                                                                                            
Interest expense                                       (296)        (481)          (349)
Other  income (expense), net                            (53)         129           (515)
                                                    --------    ---------       --------
Income (loss)  before provision for                                                         
income taxes                                                                                
                                                      2,098         (378)        (4,795)
                                                                                            
Provision for income taxes                              (74)                             
                                                     --------   ---------        --------
                                                                                            
                                                                                            
Net income (loss)                                  $  2,024    $    (378)        (4,795)
                                                     ========   =========        ========
                                                                                            
Net income (loss) per share                        $   0.77    $   (0.91)      $ (12.11)
                                                     ========   =========        ========
                                                                                            
Shares used in per share calculation                  2,673          414            396 
                                                     ========   =========        ========
                                                                                  
Pro forma net loss per share                                   $  ( 0.16)
                                                                ========= 

Pro forma shares used in per share
calculation
                                                                   2,396
                                                                 ======== 

</TABLE>

The  accompanying  notes are an  integral  part of these  financial  statements.

                                      F-4
<PAGE>
<TABLE>
<CAPTION>
                                      
                                    CASTELLE
                 CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
                                 (in thousands)
                                     -----



                                                                                        Notes
                                                                                      Receivable            
                                                                                         for             
                                           Preferred Stock         Common Stock      Purchase of                     
                                           -----------------     -----------------     Common     Accumulated
                                           Shares    Amount      Shares   Amount        Stock       Deficit         Total
                                           ------    -------     ------   --------   ----------   -----------      -------

<S>                                       <C>      <C>            <C>     <C>         <C>           <C>            <C>   
Balances, December 31, 1992                19,339   $ 12,911       330     $  237      $ (149)       $(9,506)       $3,493
Issuance of common stock  through
exercise of purchase rights
                                                                    39         39         (31)                           8
Other                                                                          24                                       24
Repurchase of common stock                                         (57)       (63)         56                           (7)
Payment of note receivable                                                                 13                           13
Net loss                                                                                              (4,795)       (4,795)
                                           ------    -------     ------   --------     -------       --------       -------


Balances, December 31, 1993                19,339    12,911        312        237        (111)       (14,301)       (1,264)
Issuance  of  Series E  preferred           3,010     2,949                                                          2,949
stock, net of issuance costs
Issuance of common stock warrants                                              20                                       20
Issuance of common stock  through
exercise of purchase rights
                                                                   154         31         (31)
Other                                                                          28                                       28
Repurchase of common stock                                         (13)       (12)         12
Net loss                                                                                                (378)         (378)
                                           ------    -------     ------   --------     -------       --------       -------


Balances, December 31, 1994                22,349     15,860       453        304        (130)       (14,679)        1,355
Issuance of common stock through:
Exercise of stock options                                            2          1                                        1
Exercise of purchase rights                                         52        263        (263)                           -
Initial public  offering,  net of
issuance costs
                                                                 1,000      5,886                                    5,886
Exercise of warrants                                                 7          7                                        7
Conversion of preferred shares            (22,349)   (15,860)    1,970     15,860                                        -
Other                                                                          17                                       17
Repurchase of common stock                                         (15)       (15)         14                           (1)
Net income                                                                                             2,024         2,024
                                           ------    -------     ------   --------     -------       --------       -------

Balances, December 31, 1995                    -     $    -      3,469   $ 22,323      $ (379)      $(12,655)      $ 9,289
                                           ======    =======     ======   ========     =======       ========       =======


</TABLE>

The  accompanying  notes are an  integral  part of these  financial  statements.

                                      F-5
<PAGE>
<TABLE>
<CAPTION>
                                                         
                                    CASTELLE
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (in thousands)
                                      

                                                                                     Year Ended December 31,
                                                                               ------------------------------------
                                                                                 1995         1994          1993
                                                                               --------     ---------    ----------
Cash flows from operating activities:
<S>                                                                            <C>          <C>          <C>      
Net income  (loss)                                                             $   2,024    $   (378)     $(4,795)     
Adjustments  to reconcile  net income  (loss) to net cash provided by                                                 
(used in) operating activities:                                                                                       
Depreciation and amortization                                                        594         893          734      
Provision for doubtful accounts                                                       75         222          152      
Provision for excess and obsolete inventory                                          323         279          729      
Changes in assets and liabilities:                                                                                    
Accounts receivable                                                               (1,039)       (361)       3,017      
Inventories                                                                       (1,225)       (167)        (546)     
Prepaid expenses and other current assets                                           (174)                    (120)     
Accounts payable                                                                   1,626        (357)         296      
Accrued liabilities and other long-term liabilities                                  800        (247)       1,369      
                                                                               ----------   ---------     --------     
                                                                                                                      
                                                                                                                      
Net cash provided by (used in) operating activities                                3,004        (116)         836      
                                                                               ----------   ---------     --------     
                                                                                                                      
Cash flows from investing activities:                                                                                 
Acquisition of property and equipment                                               (195)       (392)        (321)     
Capitalization of software development costs                                                     (12)        (281)     
Acquisition of intangible assets                                                                 (59)        (506)     
(Increase) decrease in other assets                                                  (24)         35          (32)     
                                                                               ----------   ---------     --------     
                                                                                                                      
                                                                                                                      
Net cash used in investing activities                                               (219)       (428)      (1,140)     
                                                                               ----------   ---------     --------     
                                                                                                                      
Cash flows from financing activities:                                                                                 
(Increase) decrease in restricted cash                                               426        (426)                 
Repayment of notes payable                                                        (1,123)     (1,036)                 
Proceeds from bank borrowings                                                     18,933      15,784        1,100      
Repayment of bank borrowings                                                     (20,509)    (17,292)         (84)     
Principal payments on capitalized leases                                             (44)        (47)         (40)     
Proceeds from borrowings under notes payable to shareholders,  net of                                         500      
issuance costs                                                                                                        
Proceeds from issuance of preferred stock, net of issuance costs                               2,566                  
Proceeds from collection of note receivable for stock                                                          13      
Proceeds  from  issuance  of  common  stock  and  warrants,   net  of                             20            1      
repurchases                                                                                                           
                                                                                   5,893                              
                                                                               ----------   ---------     --------     
                                                                                                                      
                                                                                                                      
Net cash provided by (used in) financing activities                                3,576        (431)       1,490      
                                                                               ----------   ---------     --------     
                                                                                                                      
Net increase (decrease) in cash and cash equivalents                               6,361        (975)       1,186      
                                                                                                                      
Cash and cash equivalents at beginning of period                                     907       1,882          696      
                                                                               ----------   ---------     --------     
                                                                                                                      
Cash and cash equivalents at end of period                                     $   7,268    $    907      $ 1,882      
                                                                               ==========   =========     ========     
                                                                                                                      
Supplemental information:                                                                                             
Cash paid during the period for:                                                                                      
Interest                                                                       $     217    $    474      $   293      
Income taxes                                                                   $      57                              
Noncash investing and financing activities:                                                                           
Acquisition of property and equipment under capitalized leases                                                125      
Conversion of notes payable to shareholders to preferred stock                                   383                  
Issuance of common stock in exchange for notes receivable                            263          31           31      
Repurchase of common stock in exchange for notes receivable                           14          12           56      
Accounts payable replaced with a note                                                                       2,121      
Cancellation of license prepayment and related accrued liability                                 500                  
Issuance of common stock on conversion of preferred stock                         15,860                              
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
</TABLE>                                         
   
                                      F-6
<PAGE>                                                                   
                                                                         
                                                                      
                                                    


- --------------------------------------------------------------------------------
   1.      Business and Organization of the Company:
- --------------------------------------------------------------------------------

           Castelle  (the  Company)  designs,  develops,  markets and  supports
           network  enhancement  products,  both  software  and  hardware, that
           improve the productivity, performance and functionality of local area
           networks  (LANs) and enhance the LAN user's  ability to communicate.
           The Company's  current  products include FaxPress fax server systems
           and a software-only  fax server, JetPress and LANpress print servers
           and a range of software enhancements for the Company's fax and print
           server product lines. The Company distributes its products primarily
           through a two-tier, domestic and international distribution network,
           with its  distributors  selling Castelle's  products to  value-added
           resellers,  system integrators, retailers and other resellers in the
           United  States, Europe and the Pacific  Rim.  The  Company  also has
           relationships  with selected  original equipment  manufacturers  and
           system  integrators  and sells  software enhancements  and  upgrades
           directly to end users.


   2.       Summary of Significant Accounting Policies:

               Basis of Consolidation:

               The  Company  has a  wholly  owned  subsidiary  in the  State  of
               Delaware, Castelle International,  Inc., which has a wholly owned
               subsidiary   in  the   Netherlands,   Castelle   Europe  BV.  The
               consolidated  financial  statements include the accounts of these
               wholly  owned   subsidiaries.   All  intercompany   balances  and
               transactions have been eliminated.

               Use of Estimates:

               The  preparation  of  financial  statements  in  conformity  with
               generally accepted  accounting  principles requires management to
               make estimates and assumptions  that affect the reported  amounts
               of assets and liabilities and disclosure of contingent assets and
               liabilities  at the  date  of the  financial  statements  and the
               reported  amounts of revenues and expenses  during the  reporting
               period. Actual results could differ from those estimates.


                                      F-7
<PAGE>


- --------------------------------------------------------------------------------
                                    CASTELLE
- --------------------------------------------------------------------------------
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                                          
                                    Continued
                                        
               Financial Instruments:

               Cash equivalents comprise highly liquid investments with original
               maturities at the date of purchase of three months or less.


   2.       Summary of Significant Accounting Policies, continued:

               Financial Instruments, continued:

               Amounts  reported  for cash  equivalents,  receivables  and other
               financial  instruments are considered to approximate  fair values
               based  upon  comparable  market  information   available  at  the
               respective balance sheet dates.

               Financial  instruments  that  potentially  subject the Company to
               concentrations of credit risks comprise, principally, cash, notes
               receivable and trade accounts  receivable.  The Company maintains
               its cash balances at a variety of financial  institutions and has
               not  experienced  any losses  relating to any of its money market
               funds or bank deposits.

               Certain Risks and Concentrations:

               Ongoing customer credit evaluations are performed by the Company,
               and collateral is not required.  The Company maintains allowances
               for  potential  returns and credit  losses,  and such returns and
               losses have generally been within management's expectations.  Two
               customers  accounted  for 41% and 23% of accounts  receivable  at
               December  31,  1995 and 1994,  respectively.  One other  customer
               accounted  for  an  additional  18%  of  accounts  receivable  at
               December 31, 1994.

                                      F-8

<PAGE>


- --------------------------------------------------------------------------------
                                    CASTELLE
- --------------------------------------------------------------------------------
              NOTES TO CONSOLIDATED FINANCIAL STATEMENTS, Continued
                                                         
                                    Continued
                                       
               The  Company's  products  include  components  subject  to  rapid
               technological  change.  Significant  technological  change  could
               adversely affect the Company's  operating results and subject the
               Company to returns of product  and  inventory  losses.  While the
               Company has ongoing  programs to minimize  the adverse  effect of
               such changes and consider  technological change in estimating its
               allowances,  such  estimates  could  change  in  the  future.  In
               addition,  one of the Company's recently  introduced print server
               products  is  currently  manufactured  by a single  supplier  and
               certain key components  are currently  available from only single
               sources.

               Inventories:

               Inventories  are  stated at the  lower of  standard  cost  (which
               approximates cost on a first-in, first-out basis) or market.

                                      F-9
<PAGE>

   2.       Summary of Significant Accounting Policies, continued:

               Property and Equipment:

               Property  and  equipment  are  stated  at cost  less  accumulated
               depreciation and amortization. Depreciation is provided using the
               straight-line  method  over  the  estimated  useful  lives of the
               respective assets,  generally three to seven years.  Amortization
               of leasehold  improvements is provided on a  straight-line  basis
               over the life of the related asset or the lease term, if shorter.

               Software Production Costs:

               Costs  related  to  the  conceptual  formulation  and  design  of
               software  products are expensed as research and development while
               costs   incurred   subsequent   to   establishing   technological
               feasibility of software  products are  capitalized  until general
               release of the product.  Generally,  technological feasibility is
               established  upon  completion of a working model.  Costs incurred
               subsequent to such point have not been  significant  in 1995, and
               all such costs have been expensed.

               Revenue Recognition:

               Product   revenue  is  recognized   upon  shipment   provided  no
               significant  vendor  obligations  remain  and  collection  of the
               resulting  receivable  is  deemed  probable  by  management.  The
               Company enters into agreements  with certain of its  distributors
               which permit limited stock rotation rights.  These stock rotation
               rights allow the  distributor  to return  products for credit but
               require the  purchase  of  additional  products  of equal  value.
               Revenues   subject  to  stock  rotation  rights  are  reduced  by
               management's estimates of anticipated  exchanges.  Provisions for
               estimated  warranty costs,  insignificant  vendor obligations and
               anticipated  retroactive  price  adjustments  are recorded at the
               time products are shipped.

               Advertising Costs:

               Advertising costs, included in sales and marketing expenses,  are
               expensed as incurred and were $914,000,  $723,000 and $985,000 in
               1995, 1994 and 1993, respectively.

               Foreign Currency Translation:

               The functional  currency of the Company's  foreign  subsidiary is
               the U.S. dollar.  Foreign  currency gains and losses,  which have
               not been material, are reported in the statement of operations.

                                      F-10
<PAGE>

   2.       Summary of Significant Accounting Policies, continued:

               Net Income (Loss) Per Share:

               Net income  (loss) per share is based upon the  weighted  average
               number of common and common equivalent shares outstanding. Common
               equivalent  shares,  options and warrants are included in the per
               share  calculations  where the effect of their inclusion would be
               dilutive. Pro forma net loss per share has been presented for the
               year  ended  December  31,  1994 to depict  what the net loss per
               share  would  have  been  had the  common  shares  issuable  upon
               conversion of the  outstanding  convertible  preferred stock been
               outstanding during such period.

               Reclassifications:

               Certain  reclassifications  have  been  made to the 1993 and 1994
               statements of cash flows  presentations  to conform with the 1995
               presentation.

               Recent Pronouncements:

               During  March 1995,  the  Financial  Accounting  Standards  Board
               issued  Statement  No.  121  (SFAS  121),   "Accounting  for  the
               Impairment of Long-Lived  Assets and for Long-Lived  Assets to Be
               Disposed Of," which requires the Company to review for impairment
               of  long-lived  assets,  certain  identifiable  intangibles,  and
               goodwill  related to those assets  whenever  events or changes in
               circumstances indicate that the carrying amount of an asset might
               not be  recoverable.  In certain  situations,  an impairment loss
               would  be  recognized.  SFAS 121 will  become  effective  for the
               Company's year ending  December 31, 1996. The Company has studied
               the   implications   of  SFAS  121  and,  based  on  its  initial
               evaluation,  does not expect it to have a material  impact on the
               Company's financial condition or results of operations.

               During October 1995,  the Financial  Accounting  Standards  Board
               issued Statement No. 123 (SFAS 123),  "Accounting for Stock-Based
               Compensation"  which  establishes  a fair value  based  method of
               accounting  for  stock-based   compensation  plans  and  requires
               additional disclosures for those companies who elect not to adopt
               the new method of accounting.  The Company intends to continue to
               account for employee  purchase rights and stock options under APB
               Opinion No. 25,  "Accounting  for Stock Issued to Employees"  and
               will  be  required  to  provide  additional  disclosures  in  the
               financial statements for the year ended December 31, 1996.

                                      F-11
<PAGE>



   3.      Balance Sheet Detail, (in thousands):

               Inventories:


                                                
                                                      December 31,
                                                 -----------------------
                                                      1995         1994
                                                 ----------    ---------
Raw material                                     $   2,320     $    661
Work in process                                        419           66
Finished goods                                         898        2,008
                                                 ----------    ---------
                                                 $   3,637     $  2,735
                                                 ==========    =========


               Property and Equipment:



                                                        December 31,
                                                   -----------------------
                                                       1995          1994
                                                   ---------     ---------
Production, test and demonstration equipment       $    524      $    525
Computer equipment                                    1,744         1,678
Office equipment                                        267           287
Leasehold improvements                                  102            91
                                                    --------      --------
                                                      2,637         2,581
Less accumulated depreciation and amortization       (2,303)       (1,914)
                                                    --------      --------
                                                   $    334      $    667
                                                    ========      ========


Equipment  acquired under capital leases  
included in property and equipment
above comprise:



                                                         December 31,
                                                      -------------------
                                                        1995        1994
                                                      -------     -------
Equipment                                             $  151      $  161
Less accumulated amortization                           (133)        (93)
                                                      -------      ------
                                                      $   18      $   68
                                                      =======      ======

                                      F-12
<PAGE>

   3.      Balance Sheet Detail, (in thousands), continued:

               Accrued Liabilities:



                                                          December 31,
                                                     -----------------------
                                                          1995         1994
                                                     ----------    ---------
Accrued compensation                                 $     620     $    279
Accrued sales and marketing                                698          666
Deferred revenue                                                        263
Accrued professional fees                                  332           45
Other                                                      798          395
                                                     ----------    ---------
                                                     $   2,448     $  1,648
                                                     ==========    =========



   4.       Commitments:

           The Company leases its  facilities  under a  noncancelable  operating
           lease that expires in October 2000.  The Company is  responsible  for
           certain  maintenance  costs,  taxes and  insurance  under the  lease.
           Future minimum payments under  noncancelable  operating leases are as
           follows:



                   1996          $  270
                   1997             283
                   1998             296
                   1999             309
                   2000             268



           Rent expense,  including the facility lease and equipment rental, was
           $367,000, $313,000 and $299,000 for 1995, 1994 and 1993,respectively.

                                      F-13
<PAGE>

   5.      Bank Borrowings:

           The Company has a $3.5 million line of credit which  expires on March
           31, 1996.  Borrowings under this line of credit agreement are limited
           to  a  percentage  of  eligible  accounts  receivable  and  inventory
           ($1,805,000 at December 31, 1995), are  collateralized  by all assets
           of the  Company and bear  interest  at the bank's  prime rate plus 2%
           falling to prime plus  1.75%  when a certain  financial  ratio is met
           (10.25 % at December 31, 1995).  The weighted  average  interest rate
           during  1995 was  10.83%.  As of  December  31,  1995,  there  are no
           borrowings  under  the line of credit  agreement.  In  addition,  the
           Company  maintains a $500,000  equipment  term loan  credit  facility
           ("equipment facility") with the same bank which expires on August 11,
           1999.   Borrowings   under   this   equipment   facility   are   also
           collateralized  by all assets of the Company and bear interest at the
           bank's  prime rate plus 1.50%  (10.00% at December 31,  1995).  As of
           December  31,  1995,  there are no  borrowings  under  the  equipment
           facility.  Under the terms of the line of  credit  and the  equipment
           facility agreements,  the Company is prohibited from paying dividends
           and the bank has the right of set-off  against  certain cash balances
           maintained  by the  Company at the bank  which  totaled  $426,000  at
           December 31, 1994 and $0 at December 31, 1995. The line of credit and
           equipment  facility  agreements  contain certain financial  covenants
           including a requirement  for the Company to maintain  minimum monthly
           tangible net worth and remain profitable on a quarterly basis.

   6.       Long-Term Debt:

                                                 December 31,
                                            ------------------------
                                                 1995          1994
                                            ----------     ---------


            Bank note payable              $        7     $      83
            Vendor note payable                   159         1,206 
            Capital lease obligations              31            75
                                             ---------     ---------
                                                  197         1,364
           Less current maturities               (193)       (1,094)
                                             ---------     ---------
                                            $       4     $     270 
                                             =========     =========


The bank note  payable  bears  interest  at 12% per annum  and is  repayable  in
monthly installments of principal and interest.  The note is subject to the same
conditions as the  Company's  line of credit (see Note 5) and was repaid in full
in January 1996.

The  long-term  vendor note  payable,  which  resulted  from the  conversion  of
$2,121,000  of accounts  payable due to a single  vendor at December  31,  1993,
bears interest at 7% per annum and was repaid in full in January 1996.

                                      F-14
<PAGE>

   7.       Common Stock:

           In 1995, the Company's Board of Directors authorized a one-for-twenty
           reverse stock split of its common  shares,  subject to  shareholders'
           approval.  All references in the accompanying  consolidated financial
           statements  to the number of common shares and per share amounts have
           been retroactively restated to reflect the reverse stock split.

           In  connection  with  the  sale of  common  stock  to two  executives
           (152,815  shares at $0.20 per share in October 1994 and 52,500 shares
           at $5.00  per  share in April  1995),  the  Company  has the right to
           repurchase  the 205,315 shares at cost in the event of termination of
           service.  These rights lapse  ratably  through  1999. At December 31,
           1995,  157,560 such shares were subject to the  Company's  repurchase
           right.

               Non-Employee Directors' Stock Option Plan:

               In November  1995, the Company's  Board of Directors  adopted the
               1995  Non-Employee  Directors' Stock Option Plan (Directors Plan)
               subject to  shareholders'  approval.  As of  December  31,  1995,
               120,000  shares of the Company's  common stock have been reserved
               for issuance  under the Directors  Plan,  and no shares have been
               issued.

               1988 Incentive Stock Plan:

               Under the 1988  Incentive  Stock Plan (1988  Plan),  the Board of
               Directors  may  grant  either  the  right to  purchase  shares or
               options  to  purchase  shares of the  Company's  common  stock at
               prices not less than the fair  market  value at the date of grant
               for  qualified  options  and 85% of the  fair  market  value  for
               non-qualified options and purchase rights.  Options granted under
               the 1988 Plan  generally  become  exercisable,  and the Company's
               right to  repurchase  shares  issued and sold  pursuant  to stock
               purchase  rights  lapses,  at a rate of one-quarter of the shares
               under option or purchased  under stock purchase rights at the end
               of the first  year and  thereafter  ratably  over the next  three
               years and generally expire seven years from the date of grant. As
               of  December  31,  1995,  there  were no  stock  purchase  rights
               outstanding,   and  1,217  shares  purchased  pursuant  to  stock
               purchase rights were subject to repurchase by the Company.

               The Company has reserved  945,579  shares for issuance  under the
               1988  Plan of  which 399,995  shares  were available  for  future
               grants at December 31, 1995.

                                      F-15
<PAGE>
   7.       Common Stock, continued:

               1988 Incentive Stock Plan, continued

               Option activity under the 1988 Plan is as follows (in thousands):



                                                Stock Options Outstanding
                                        ----------------------------------------
                                        Number of       Exercise
                                         Shares          Price           Total
                                        ----------    -------------     --------
Balances, December 31, 1992                    29        $5.00          $   144
Options granted                                31     $5.00-$25.00          546
Options canceled                               (3)       $15.00             (41)
                                        ----------                      --------
Balances, December 31, 1993                    57     $5.00-$25.00          649
Options granted                               116         $.20               24
Options canceled                              (73)    $.20-$20.00          (267)
                                        ----------                      --------
Balances, December 31, 1994                   100     $.20-$20.00           406
Options granted                               191      $.20-$6.00           853
Options canceled                              (27)    $.20-$25.00          (133)
Options exercised                              (2)    $.20-$18.00            (1)
                                        ----------                      --------
Balances, December 31, 1995                   262      $.20-$6.00       $ 1,125
                                        ==========                      ========


At  December 31, 1995, 37,058 options outstanding were exercisable.

In February  1995,  the Board of Directors  gave certain  employees the right to
cancel  certain  outstanding  stock  options and  receive  new  options  with an
exercise  price of $0.20 per share.  Options for 6,635 shares of common stock at
original  exercise  prices ranging from $5.00 to $25.00 per share were canceled,
and new options for a like number of shares were issued in fiscal 1995.  The new
options retained the vesting of the canceled options.

Warrants:

The Company has outstanding fully  exercisable  warrants at December 31, 1995 as
follows (in thousands):



                                 Stock Under              Exercise      Number
   Expiration Date                 Warrant                 Price      of Shares
- ----------------------     ------------------------       ---------    ---------
December 2000              Common                          $8.40            100
March 2000                 Common                          $1.00            133
March 1999                 Common                          $0.15            300

                                      F-16
<PAGE>
   7.       Common Stock, continued:

               Warrants, continued:

               The warrant holders have certain demand and  registration  rights
               as  specified  in  the  warrant  agreement.  During  1995,  6,916
               warrants were exercised.

               At December  31,  1995,  the  Company  held notes  receivable  of
               $379,000,  which bear interest  between 6.3% and 7.01% per annum,
               from  three  executive  officers  or  directors  and four  former
               employees, issued in connection with the purchase of common stock
               under  restricted  stock purchase  agreements.  The principal and
               accrued  interest  on these  notes are due at various  dates from
               December 1996 through September 2000.


   8.      Income Taxes:

           The Company's tax provision differs from the provision computed using
           statutory income tax rates as follows (in thousands):
<TABLE>
<CAPTION>



                                                            Year Ended December 31, 
                                                      -----------------------------------
                                                           1995         1994        1993
                                                      ----------    --------    ---------

<S>                                                   <C>           <C>         <C>      
Federal tax at statutory rate                         $     713     $  (129)    $ (1,630)
Permanent difference due to non-deductible expenses          12          (5)         142
State taxes, net of federal benefit                          98         (12)        (147)
Utilization of net operating loss carryforwards            (823)
Net operating losses not benefited                                      146        1,635
Other                                                        74
                                                      ----------    --------    ---------


                                                      $      74     $     -     $      -
                                                      ----------    --------    ---------


</TABLE>


                                      F-17
<PAGE>



   8.      Income Taxes, continued:

           The components of the net deferred tax assets and  liabilities are as
follows (in thousands):



                                                December 31,
                                           -----------------------
                                               1995          1994
                                           ---------     ---------

Inventory allowances and adjustments       $    323      $    266
Accounts receivable allowances                  511           496
Other liabilities and allowances                619           399
State income taxes                              260           358
Net operating loss carryforwards              3,027         3,752
Valuation allowance                          (4,740)       (5,210)
                                            --------      --------
Total deferred tax assets                         -      $     61
                                            ========      ========
Capitalized software                              -           (61)
                                            --------      --------
Total deferred tax liabilities             $      -      $    (61) 
                                            --------      --------


AtDecember 31, 1995, the Company had federal net operating loss carryforwards of
approximately  $8,900,000  available to offset  future  regular and  alternative
minimum  taxable  income.  Additionally,  at December 31, 1995,  the Company had
state net operating loss carryforwards of approximately  $3,400,000 available to
reduce taxable income in future years.  These loss  carryforwards  expire in the
years from 1998 through 2009.

The Tax Reform  Act of 1986  substantially  changed  the rules  relative  to net
operating  loss  carryforwards  in  the  event  of an  "ownership  change"  of a
corporation. Future changes in ownership may result in limitations on the annual
utilization of net operating loss carryforwards.

The Company's income before provision for income taxes is substantially all from
its domestic operations.


   9.      Retirement Plan:

           The Company has a voluntary  401(k) plan covering  substantially  all
           employees.  The  plan  provides  for  employer  contributions  at the
           discretion of the Board of  Directors.  In 1993,  1994 and 1995,  the
           Company made no contributions to the plan.

                                      F-18
<PAGE>



   10.     Major Customers and Segment Information:

           The Company  operates in one industry  segment and develops,  markets
           and supports network enhancement products.

           The  Company's  export  revenues are all denominated in U.S. dollars,
           and are  summarized  as follows (in thousands):



                                      Years Ended December 31,
                               --------------------------------------
                                     1995          1994         1993
                               -----------    ----------    ---------
           Europe              $    4,700     $   4,400     $  4,300
           Pacific Rim              8,300         3,800        2,100
                               -----------    ----------    ---------
                               $   13,000     $   8,200     $  6,400
                               -----------    ----------    ---------


Customers that  individually  accounted for greater than 10% of net sales are as
follows (in thousands):

                                 Years Ended December 31,
             ------------------------------------------------------------------
Customer            1995                     1994                    1993
- --------
             ------------------       ------------------       ----------------

A            $  2,761       11%       $  2,549       13%       $  3,388     19%
B               4,514       18%          4,465       23%          2,733     15%
C               7,300       29%          3,296       17%          1,127      6%


                                      F-19
<PAGE>


<TABLE>
<CAPTION>

                                    CASTELLE
                           CONSOLIDATED BALANCE SHEETS
                                 (in thousands)


                              ASSETS                   June 28,         December 31,
                                                         1996               1995
                                                      (unaudited)
Current assets:
<S>                                               <C>               <C>              
Cash and cash equivalents                         $          7,416  $           7,268
Accounts receivable, net of allowance for
doubtful accounts of $414 in 1996 and 1995                   2,266              2,837
Inventories                                                  4,988              3,637
Prepaid expenses and other current assets                      558                471
                                                     --------------    ---------------
Total current assets                                        15,228             14,213

Property plant and equipment, net                              374                334
Other assets, net                                               94                120
                                                     --------------    ---------------
Total assets                                      $         15,696  $          14,667
                                                     ==============    ===============

                            LIABILITIES
Current liabilities:
Long-term debt, current portion                                     $             193
Accounts payable                                  $          1,869              2,723
Accrued liabilities                                          2,118              2,448
                                                     --------------    ---------------
Total current liabilities                                    3,987              5,364

Long-term debt, less current portion                                                4
Other long-term liabilities                                                        10
                                                     --------------    ---------------
Total liabilities                                            3,987              5,378

                       SHAREHOLDERS' EQUITY
Common stock, no par value:
Authorized:  25,000 shares
Issued and outstanding:  3,621 shares                      
in 1996 and 3,469 shares in 1995                            23,298             22,322   
Notes receivable for purchase of common stock                (296)              (379)
Accumulated deficit                                       (11,293)           (12,655)
                                                     --------------    ---------------

Total shareholders' equity                                  11,709              9,289
                                                     --------------    ---------------

Total liabilities and shareholders' equity        $         15,696  $          14,667
                                                     ==============    ===============

</TABLE>

    The accompanying notes are an integral part of these financial statements

                                      F-20

<PAGE>
<TABLE>
<CAPTION>


                                    CASTELLE
                        CONSOLIDATED STATEMENTS OF INCOME
                      (in thousands, except per share data)
                                                                 


                                                             3 MONTHS ENDED                     3 MONTHS ENDED
                                                             JUNE 28, 1996                       JUNE 30, 1995
                                                              (unaudited)                         (unaudited)

<S>                                                <C>                                <C>                             
Net sales                                          $                         7,225    $                          6,190

Cost of sales                                                                3,778                               3,406
                                                      -----------------------------      ------------------------------

Gross profit                                                                 3,447                               2,784
                                                      -----------------------------      ------------------------------

Operating expenses:

Research and development                                                       524                                 497

Sales and marketing                                                          1,706                               1,422

General and administrative                                                     427                                 309
                                                      -----------------------------      ------------------------------

Total operating expenses                                                     2,657                               2,228
                                                      -----------------------------      ------------------------------

Operating  income                                                              790                                 556

Interest income (expense), net                                                  94                                (73)
Other expense , net                                                           (55)

                                                      -----------------------------      ------------------------------  
 Income before provision for income taxes                                      829                                 483

Provision for income taxes                                                    (36)                                (18)
                                                      -----------------------------      ------------------------------

Net income                                         $                           793    $                            465
                                                      =============================      ==============================

Net income per share                               $                          0.20    $                           0.18
                                                      =============================      ==============================

Shares used in per share calculation                                         3,943                               2,646
                                                      =============================      ==============================

</TABLE>

    The accompanying notes are an integral part of these financial statements

                                       F-21

<PAGE>
<TABLE>
<CAPTION>



                                    CASTELLE
                        CONSOLIDATED STATEMENTS OF INCOME
                      (in thousands, except per share data)


                                                        6 MONTHS ENDED JUNE 28,            6 MONTHS ENDED JUNE 30,
                                                                 1996                               1995
                                                              (unaudited)                        (unaudited)

<S>                                                <C>                               <C>                              
Net sales                                          $                        13,425   $                          11,874

Cost of sales                                                                7,117                               6,385
                                                     ------------------------------    --------------------------------

Gross profit                                                                 6,308                               5,489
                                                     ------------------------------    --------------------------------

Operating expenses:

Research and development                                                     1,057                                 996

Sales and marketing                                                          3,199                               2,785

General and administrative                                                     718                                 623
                                                     ------------------------------    --------------------------------

Total operating expenses                                                     4,974                               4,404
                                                     ------------------------------    --------------------------------

Operating income                                                             1,334                               1,085

Interest income (expense), net                                                 167                               (192)
Other expense, net                                                            (75)                                   0
                                                     ------------------------------    --------------------------------

Income before provision for income taxes                                     1,426                                 893

Provision for income taxes                                                    (64)                                (23)
                                                     ------------------------------    --------------------------------

Net income                                         $                         1,362   $                             870
                                                     ==============================    ================================

Net income per share                               $                          0.35   $                            0.34
                                                     ==============================    ================================

 Shares used in per share calculation                                        3,887                               2,648
                                                     ==============================    ================================


</TABLE>

    The accompanying notes are an integral part of these financial statements


                                      F-22



<PAGE>
<TABLE>
<CAPTION>


                                    CASTELLE
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (in thousands)
                                                                

                                                               6 MONTHS ENDED JUNE         6 MONTHS ENDED JUNE 30,
                                                                    28, 1996                        1995
                                                                   (unaudited)                   (unaudited)
Cash flows from operating activities:
<S>                                                       <C>                          <C>                         
Net income                                                $                    1,362   $                        870
Adjustments to reconcile net income to net cash
provided by (used in) operating activities:
Depreciation and amortization                                                    174                            354
Write off of other assets and property and equipment                              11
Provision for doubtful accounts                                                                                   2
Provision for excess and obsolete inventory and used                         
equipment                                                                      (248)                             45
Changes in assets and liabilities:
Accounts receivable                                                              571                            930
Inventories                                                                  (1,103)                          (676)
Prepaid expenses and other assets                                               (87)                             31
Accounts payable                                                               (854)                             29
Accrued liabilities and other long-term liabilities                            (340)                            209
                                                             ------------------------     --------------------------

Net cash provided by (used in) operating activities                            (514)                          1,794
                                                             ------------------------     --------------------------

Cash flows from investing activities:
Acquisition of property and equipment                                          (176)                          (108)
Acquisition of intangible assets                                                (23)                           (25)
                                                             ------------------------     --------------------------

Net cash used in investing activities                                          (199)                          (133)
                                                             ------------------------     --------------------------

Cash flows from financing activities:
Decrease in restricted cash                                                                                     152
Repayment of notes payable                                                     (166)                          (526)
Proceeds from bank borrowings                                                                                 4,586
Repayment of bank borrowings                                                                                (5,124)
Principal payments on capitalized leases                                        (31)                           (22)
Proceeds from issuance of common stock                                           975
Proceeds from collection of notes receivable for                        
stock                                                                             83                                 
                                                             ------------------------     --------------------------

Net cash provided by (used in) financing activities                              861                          (934)
                                                             ------------------------     --------------------------

Net increase in cash and cash equivalents                                        148                            727

Cash and cash equivalents at beginning of period                               7,268                            907
                                                             ------------------------     --------------------------

Cash and cash equivalents at end of period                $                    7,416   $                      1,634
                                                             ========================     ==========================

</TABLE>

    The accompanying notes are an integral part of these financial statements

                                       F-23

<PAGE>


                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


1.   Basis of Presentation

     The accompanying  unaudited  consolidated  financial statements include the
     accounts  of the  Company and its  wholly-owned  subsidiary,  and have been
     prepared in accordance with generally accepted accounting  principles.  All
     intercompany accounts and transactions have been eliminated. In the opinion
     of management,  all adjustments  (consisting of normal recurring  accruals)
     considered  necessary for a fair  presentation  of the Company's  financial
     position,  results  of  operations  and cash flows at the dates and for the
     periods  indicated  have been  included.  The results of operations for the
     interim period presented are not necessarily  indicative of the results for
     the year ending December 31, 1996. Because all of the disclosures  required
     by  generally  accepted  accounting  principles  are  not included  in  the
     accompanying  consolidated  financial  statements,  they  should be read in
     conjunction with the audited consolidated  financial statements and related
     notes included in the Company's Annual Report on Form 10-KSB for the fiscal
     year ended December 31, 1995.


2.   Net Income Per Share

     Net income per share is based upon the  weighted  average  number of common
     and common equivalent shares outstanding. Common equivalent shares, options
     and warrants are included in the per share  calculation where the effect of
     their inclusion would be dilutive.


3.   Inventories

     Inventories  are stated at the lower of standard  cost (which  approximates
     cost on a first-in, first-out basis) or market.

                          JUNE 28,                     DECEMBER 31,
                            1996                           1995

Raw  material       $            2,801           $               2,320
Work in process                    768                             419
Finished goods                   1,419                             898
                       ----------------             -------------------

                    $            4,988           $               3,637
                       ================             ===================

                                       F-24


<PAGE>

<TABLE> <S> <C>

<ARTICLE>                                     5
<MULTIPLIER>                                  1,000
       
<S>                                                     <C>
<PERIOD-TYPE>                                 6-MOS
<FISCAL-YEAR-END>                             DEC-31-1996
<PERIOD-END>                                  JUN-28-1996              
<CASH>                                                          7,416
<SECURITIES>                                                        0
<RECEIVABLES>                                                   2,680
<ALLOWANCES>                                                      414
<INVENTORY>                                                     4,988
<CURRENT-ASSETS>                                               15,228
<PP&E>                                                          2,812
<DEPRECIATION>                                                  2,438
<TOTAL-ASSETS>                                                 15,696
<CURRENT-LIABILITIES>                                           3,987
<BONDS>                                                             0
                                               0
                                                         0
<COMMON>                                                       23,298
<OTHER-SE>                                                          0
<TOTAL-LIABILITY-AND-EQUITY>                                   15,696
<SALES>                                                        13,425
<TOTAL-REVENUES>                                               13,425
<CGS>                                                           7,117
<TOTAL-COSTS>                                                   7,117
<OTHER-EXPENSES>                                                5,049
<LOSS-PROVISION>                                                    0
<INTEREST-EXPENSE>                                               (167)
<INCOME-PRETAX>                                                 1,426
<INCOME-TAX>                                                       64
<INCOME-CONTINUING>                                             1,362
<DISCONTINUED>                                                      0
<EXTRAORDINARY>                                                     0
<CHANGES>                                                           0
<NET-INCOME>                                                    1,362
<EPS-PRIMARY>                                                    0.35
<EPS-DILUTED>                                                    0.35


<PAGE>
                                       
        

</TABLE>

                                      
 

                        REPORT OF INDEPENDENT ACCOUNTANTS




To the Board of Directors and
Shareholders of Ibex Technologies, Inc.

We have audited the accompanying balance sheets of Ibex Technologies, Inc. as of
December 31, 1995 and 1994, and the related statements of operations, changes in
shareholders'  equity and cash flows for the years then ended.  These  financial
statements   are  the   responsibility   of  the   Company's   management.   Our
responsibility  is to express an opinion on these financial  statements based on
our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material respects,  the financial position of Ibex Technologies,  Inc. as of
December 31, 1995 and 1994, and the results of its operations and its cash flows
for the years  then  ended in  conformity  with  generally  accepted  accounting
principles.






Sacramento, California
July 31, 1996, except as to Note 14,
 which the date is August 16, 1996


                                      F-25
<PAGE>
<TABLE>
<CAPTION>


                             IBEX TECHNOLOGIES, INC.
                                 BALANCE SHEETS
                        as of December 31, 1995 and 1994
                                                     
                                


                                                                                           1995           1994
                                                                                           ----           ----
                                        ASSETS


Current assets:
<S>                                                                                     <C>            <C>       
Cash                                                                                    $  138,194     $   89,815
Accounts receivable, net of allowance for doubtful accounts of $14,603 and
$21,527 in 1995 and 1994, respectively, and allowance for sales returns
of $30,000 and $45,158 in 1995 and 1994, respectively
                                                                                           542,757        583,501
Inventories                                                                                 41,030         43,835
Prepaid income taxes                                                                        44,657
Prepaid expenses and other current assets                                                   34,346         25,840
Deferred income taxes                                                                       71,086         74,007
                                                                                          ---------      ---------
         Total current assets                                                              872,070        816,998
Property and equipment, net                                                                114,027        116,991
                                                                                          ---------      ---------
        Total assets                                                                   $   986,097     $  933,989
                                                                                          =========      =========

                         LIABILITIES AND SHAREHOLDERS' EQUITY


Current liabilities:
Bank line of credit                                                                     $       --     $   27,700
Notes payable                                                                               75,000             --
Accounts payable                                                                            49,237         39,327
Accrued liabilities                                                                         14,052         15,501
Income taxes payable                                                                            --        108,682
Accrued wages                                                                                   --         23,776
Accrued vacation                                                                            43,499         32,581
Deferred revenue                                                                            97,387         70,374
                                                                                          ---------      ---------
         Total current liabilities                                                         279,175        317,941
Deferred income taxes                                                                        6,580          8,161
                                                                                          ---------      ---------
         Total liabilities                                                                 285,755        326,102
                                                                                          ---------      ---------

Commitments (Note 4)

Preferred stock, no par value:
Authorized:  5,000,000 shares
Issued and outstanding:  48,035 shares in 1995 and  1994
(liquidation preference of $300,219)                                                       300,219        300,219
Common stock, no par value:
Authorized:  10,000,000 shares
Issued and outstanding:  138,016 in 1995 and 132,150 shares in 1994                         89,574         56,250
Retained earnings                                                                          310,549        251,418
                                                                                          ---------      ---------


         Total shareholders' equity                                                        700,342        607,887
                                                                                          ---------      ---------

         Total liabilities and shareholders' equity                                     $  986,097     $  933,989
                                                                                          =========      =========
The accompanying notes are an integral part of these financial statements.


</TABLE>


                                      F-26
<PAGE>

                             IBEX TECHNOLOGIES, INC.
                            STATEMENTS OF OPERATIONS
                 for the years ended December 31, 1995 and 1994
 

                                                    1995                   1994
                     

Net sales                                 $    3,091,397         $    2,707,822

Cost of sales                                    731,904                691,058
                                           --------------         --------------

Gross profit                                   2,359,493              2,016,764
                                           --------------         --------------
Operating expenses:
Research and development                         647,654                431,782
Sales and marketing                            1,391,073                988,295
General and administrative                       262,297                255,734
                                           --------------         --------------
Total operating expenses                       2,301,024              1,675,811
                                           --------------         --------------
        Operating  income                         58,469                340,953
Other  income (expense), net                      (4,276)                (8,322)
                                           --------------         --------------
Income before provision for income taxes          54,193                332,631
Provision (benefit) for income taxes              (4,938)               120,798
                                           --------------         --------------
         Net income                       $       59,131         $      211,833
                                           ==============         ==============




                                      F-27

<PAGE>
<TABLE>
<CAPTION>


                             IBEX TECHNOLOGIES, INC.
                  STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY
                 for the years ended December 31, 1995 and 1994
                                                          
   The accompanying notes are an integral part of these financial statements.

                                                            







                                                Preferred Stock           Common Stock
                                            -----------------------    ----------------------
                                                                                                  Retained
                                            Shares        Amount       Shares        Amount       Earnings        Total
                                            --------     ----------    --------     ---------     ---------     ----------

<S>                                          <C>         <C>           <C>          <C>           <C>           <C>      
Balances, January 1, 1994                    48,035      $ 300,219     132,150      $ 56,250      $ 39,585      $ 396,054

         Net  income                             --             --          --            --       211,833        211,833
                                           --------      ---------    --------      --------      --------      ---------

Balances, December 31, 1994                  48,035        300,219     132,150        56,250       251,418        607,887
 
         Issuance of common stock                --             --       5,866        33,324            --         33,324
                                                                                               
         Net income                              --             --          --            --        59,131         59,131
                                           --------      ---------    --------      --------      --------      ---------

Balances, December 31, 1995                  48,035      $ 300,219     138,016      $ 89,574      $310,549      $ 700,342
                                           --------      ---------    --------      --------      --------      ---------



</TABLE>
                                      F-28
<PAGE>
<TABLE>
<CAPTION>


                             IBEX TECHNOLOGIES, INC.
                            STATEMENTS OF CASH FLOWS
                 for the years ended December 31, 1995 and 1994
                                                          
   The accompanying notes are an integral part of these financial statements.

                                                             



                                                                                         Year Ended December 31,
                                                                                      -----------------------------
                                                                                            1995             1994
                                                                                            ----             ----
Cash flows from operating activities:
<S>                                                                                  <C>              <C>         
Net income                                                                           $     59,131     $    211,833
Adjustments to reconcile net income  to net cash provided by operating
  activities:
Depreciation                                                                               36,596           25,591
Deferred tax provision                                                                      1,340          (17,964)
Loss on disposition of property and equipment                                              12,488               --
Allowance for doubtful accounts and sales returns                                         (22,082)          36,675
Research and development expenses paid by issuance of stock and a note                    177,969               --
                                                                                                         
Changes in assets and liabilities:
Accounts receivable                                                                        62,826         (281,876)
Inventories                                                                                 2,805          (29,587)
Prepaid taxes                                                                             (44,657)             150
Prepaid expenses and other current assets                                                  (8,506)         (12,957)
Accounts payable                                                                            9,910          (13,166)
Income tax payable                                                                       (108,682)         100,038
Accrued liabilities                                                                        (1,449)          14,129
Accrued wages                                                                             (23,776)          23,776
Accrued vacation                                                                           10,918           11,936
Deferred revenue                                                                           27,013           50,560
                                                                                      ------------      -----------

Net cash provided by operating activities                                                 191,844          119,138
                                                                                      ------------      -----------

Cash flows from investing activities:
Acquisition of property and equipment                                                     (46,120)         (53,661)
                                                                                      ------------      -----------

Net cash used in investing activities                                                     (46,120)         (53,661)
                                                                                      ------------      -----------

Cash flows from financing activities:
Repayment of notes payable                                                                (75,000)              --
Proceeds from bank lines of credit                                                        102,000               --
Repayment of bank line of credit                                                         (129,700)              --
Proceeds from issuance of common stock                                                      5,355               --
                                                                                      ------------      -----------

Net cash provided by (used in) financing activities                                       (97,345)              --
                                                                                      ------------      -----------

Net increase  in cash                                                                      48,379           65,477
Cash at beginning of period                                                                89,815           24,338
                                                                                      ------------      -----------

Cash at end of period                                                                $    138,194     $     89,815
                                                                                      ============      ===========

Supplemental information:
Cash paid during the period for:
Interest                                                                             $      7,721     $      3,682
Income taxes                                                                              147,071           38,724
Noncash  activities:
         Issuance of a note and common stock for purchase of development rights
         for a software  product                                                          177,969
         Sales  of software  products in exchange for computer software,
         marketing, advertising and telephone services                                     59,054           23,531
                                                                                                             


</TABLE>
                                      F-29
<PAGE>


                             IBEX TECHNOLOGIES, INC.
                          NOTES TO FINANCIAL STATEMENTS
                                                         

1. Business and Organization of the Company:

     Ibex  Technologies,  Inc.  (the  Company)  designs,  develops,  and markets
     fax-on-demand  software  systems.  The  Company  distributes  its  products
     primarily through its direct sales force,  master  distributors and various
     value-added  resellers to end users and service providers in North America,
     Europe and Asia.


2. Summary of Significant Accounting Policies:

                                Use of Estimates

     The  preparation  of financial  statements  in  conformity  with  generally
     accepted  accounting  principles  requires management to make estimates and
     assumptions  that affect the reported amounts of assets and liabilities and
     disclosure  of  contingent  assets  and  liabilities  at  the  date  of the
     financial  statements  and the  reported  amounts of revenues  and expenses
     during  the  reporting  period.  Actual  results  could  differ  from those
     estimates.

                        Certain Risks and Concentrations

     Financial   instruments   that   potentially   subject   the   Company   to
     concentrations  of  credit  risks  comprise,  principally,  cash and  trade
     accounts  receivable.  At  December  31,  1995,  the Company had on deposit
     approximately $222,000,  including amounts representing outstanding checks,
     at an established  financial institution and has not experienced any losses
     relating to its bank deposits.  These deposits are federally insured to the
     extent of $100,000.

     Ongoing  customer  credit  evaluations  are  performed by the Company,  and
     collateral is not required.  The Company maintains allowances for potential
     returns and credit losses,  and such returns and losses have generally been
     within management's expectations. One customer accounted for 42% and 12% of
     accounts receivable and sales at December 31, 1995. Two customers accounted
     for 39% of accounts receivable at December 31, 1994.

                                      F-30

<PAGE>


                             IBEX TECHNOLOGIES, INC.
                    NOTES TO FINANCIAL STATEMENTS, Continued
 
2.   Summary of Significant Accounting Policies, continued:

     The Company's products include  components  subject to rapid  technological
     change.   Significant  technological  change  could  adversely  affect  the
     Company's  operating  results and subject the Company to returns of product
     and inventory  losses.  While the Company has ongoing  programs to minimize
     the adverse  effect of such  changes and consider  technological  change in
     estimating its allowances, such estimates could change in the future.

                                   Inventories

     Inventories are stated at the lower of cost (first-in,  first-out basis) or
     market.

                             Property and Equipment

     Property and equipment are stated at cost less accumulated depreciation and
     amortization.  Depreciation is provided using the straight-line method over
     the estimated useful lives of the respective assets,  generally five to ten
     years.

                           Software Production Costs

     Costs related to the conceptual formulation and design of software products
     are expensed as research and development while costs incurred subsequent to
     establishing technological feasibility of software products are capitalized
     until general release of the product. Generally,  technological feasibility
     is  established  upon  completion  of  a  working  model.   Costs  incurred
     subsequent to such point have not been significant in 1995 or 1994, and all
     such costs have been expensed.

                               Revenue Recognition

     Product revenue is recognized upon shipment provided no significant  vendor
     obligations  remain and  collection of the  resulting  receivable is deemed
     probable  by  management.  Provisions  for  estimated  product  returns are
     recorded  at the time  products  are  shipped.  Revenue  earned on  service
     contracts is recognized proratably over the term of the contract.


                                Advertising Costs

     Advertising costs,  included in sales and marketing expenses,  are expensed
     as incurred and were $223,630 and $178,291 in 1995 and 1994, respectively.

                                      F-31
<PAGE>



2.   Summary of Significant Accounting Policies, continued:

                          Foreign Currency Translation

     Foreign  currency gains and losses related to  international  sales,  which
     have not been material, are reported in the statement of operations.

                                  Income Taxes

     The Company  uses the  liability  method of  accounting  for income  taxes.
     Deferred  income  taxes  are  recorded  based  on  the  difference  between
     financial  statement  and income tax bases of assets  and  liabilities  and
     available loss or credit carry forwards.

                              Recent Pronouncements

     During  March  1995,  the  Financial   Accounting  Standards  Board  issued
     Statement No. 121 (SFAS 121),  "Accounting for the Impairment of Long-Lived
     Assets and for  Long-Lived  Assets to Be Disposed  Of," which  requires the
     Company to review for impairment of long-lived assets, certain identifiable
     intangibles,  and  goodwill  related  to those  assets  whenever  events or
     changes in  circumstances  indicate  that the  carrying  amount of an asset
     might not be recoverable.  In certain situations,  an impairment loss would
     be recognized. SFAS 121 will become effective for the Company's year ending
     December 31,  1996.  The Company has studied the  implications  of SFAS 121
     and, based on its initial evaluation, does not expect it to have a material
     impact on the Company's financial condition or results of operations.

     During  October  1995,  the  Financial  Accounting  Standards  Board issued
     Statement No. 123 (SFAS 123),  "Accounting  for  Stock-Based  Compensation"
     which  establishes a fair value based method of accounting for  stock-based
     compensation plans and requires additional  disclosures for those companies
     who elect not to adopt the new method of accounting. The Company intends to
     continue to account for employee  purchase  rights and stock  options under
     APB Opinion No. 25,  "Accounting for Stock Issued to Employees" and will be
     required to provide additional  disclosures in the financial statements for
     the year ended December 31, 1996.

                                      F-32
<PAGE>
                             IBEX TECHNOLOGIES, INC.
                    NOTES TO FINANCIAL STATEMENTS, Continued

3.   Property and Equipment:
                                                           December 31,
                                                   -----------------------------
                                                        1995             1994
                                                        ----             ----
Purchased software                                $      9,592     $     36,887
Computer equipment                                     131,873          119,240
Office equipment                                        41,586           20,911
                                                   ------------      -----------
                                                       183,051          177,038
Less accumulated depreciation                           69,024           60,047
                                                   ------------      -----------
                                                  $    114,027     $    116,991
                                                   ============      ===========



4.   Commitments

     The Company  leases its  facilities and office  equipment  under  operating
     leases with initial or remaining noncancelable lease terms in excess of one
     year.  Future minimum payments under  noncancelable  operating leases as of
     December 31, 1995, are as follows:


              1996                                    $   70,680
              1997                                        33,416 
              1998                                         4,236
              1999                                           503 


     Rent  expense,  including  the facility  lease and  equipment  rental,  was
     approximately $51,000 and $35,000 for 1995 and 1994, respectively.


5.   Bank Line of Credit:

     The Company has a $250,000  line of credit which  expired on July 26, 1996.
     Borrowings  under this line of credit agreement are  collateralized  by all
     inventory of the Company and bear interest at the bank's prime rate plus 2%
     (10.50% at December 31, 1995). As of and during the year ended December 31,
     1995,  there were no borrowings  under this line of credit  agreement.  The
     line of credit agreement  contains certain  financial  covenants  including
     minimum  levels of tangible  net worth,  working  capital and debt  service
     ratios.

                                      F-33
<PAGE>



6.   Notes Payable:

     In 1995, the Company purchased exclusive license and development rights for
     a software product,  in exchange for 4,475 shares of its common stock at an
     estimated fair value of $27,969 and a non-interest bearing note payable for
     $150,000. The note, which is not collateralized, is payable in installments
     of  $25,000,  with the first  payment  due on March 17,  1995,  the  second
     payment due July 1, 1995 and quarterly thereafter.


7.   Preferred Stock:

     The  Company  has  5,000,000   shares  of  no  par  value  preferred  stock
     authorized.  As of December 31, 1995 and 1994, 48,035 shares are issued and
     outstanding.  The  preferred  stock is  convertible  into common  stock (by
     formula) (i) at the option of the preferred  stockholder  at any time after
     the  date  of  issuance,  or (ii)  automatically  in the  case of a  public
     offering of not less than  $8,000,000.  The  preferred  stock  provides for
     non-cumulative  preferential  dividends  of $.50 per year,  and  additional
     dividends  may be  declared  by the  Board of  Directors.  The  holders  of
     preferred stock are entitled to vote, and have the number of votes equal to
     the number of common  shares into which their shares are  convertible.  The
     preferred shares have  liquidation  preference for $6.25 per share, and are
     entitled to participate in the  distribution of the remaining assets of the
     Company.


8.   Stock Option Plan:

     In August 1996, the Board of Directors and the  shareholders of the Company
     ratified  the 1992 Stock  Option  Plan  which  reserves a maximum of 20,000
     shares of  authorized  but  unissued  common  stock for the  issuance  upon
     exercise of nonstatutory  stock options granted to employees,  non-employee
     directors and  consultants  of the Company.  The options are issued at fair
     market value as determined by the Board of  Directors.  The vesting  period
     and exercise term are  determined by the Board of Directors at the time the
     options are granted. The options outstanding at December 31, 1995 vest over
     a  three-year  period,  have an exercise  term of ten years,  and  exercise
     prices between $3.85 and $13.75 per share.

                                      F-34
<PAGE>

8.       Stock Option Plan, continued:

     The  following  options were granted and  exercised  during the years ended
     December 31, 1995 and 1994:


Balance at January 1, 1994                           8,563

Granted:
Exercise price of $6.25                              3,200
                                                 ----------

Balance at December 31, 1994                        11,763

Granted:
Exercise price of $6.25                              2,500
Exercise price of $13.75                               300

Exercised at $3.85 per share                        (1,391)
                                                 ----------

Balance at December 31, 1995                        13,172
                                                 =========


    The following options were outstanding at December 31, 1995 and 1994:

                                                        1995          1994
                                                        ----          ----


Vested:
Exercise price of $3.85                                4,172         5,563 
Exercise price of $6.25                                3,398         1,332 


Nonvested:
Exercise price of $6.25                                5,302         4,868
Exercise price of $13.75                                 300 
                                                     ----------    ----------


Total options outstanding at
December 31                                           13,172        11,763
                                                     ==========    ==========

                                      F-35

<PAGE>



9.  Income Taxes:

    The income tax provision consists of the following:

                                       Year ended December 31,
                                       -----------------------          
                                        1995              1994
                                        ----              ----

Current tax expense (benefit):
Federal                             $  (4,113)     $     109,204
State                                  (2,165)            29,558
Deferred tax expense (benefit)          1,340            (17,964)
                                     -----------      ------------
                                    $  (4,938)     $     120,798 
                                     ===========      ============


     A  reconciliation  between  the  Company's  effective  rate and the federal
     statutory rate is as follows:

                                          Year ended December 31,
                                        ----------------------------- 
                                          1995                1994
                                          ----                ----

Federal tax at statutory rate              34.0  %            34.0  %
Permanent difference due to non-
deductible expenses                         9.9                1.3
State taxes, net of federal benefit        (6.1)               6.1
Research and development credits          (29.1)              (6.8)
Other                                       1.2                1.7
Effect of graduated tax rates             (19.0)                --
                                       ----------        -----------

                                           (9.1) %            36.3  %
                                       ==========        ===========

                                      F-36
<PAGE>



9.   Income Taxes, continued:

     The  components  of the net  deferred  tax  assets and  liabilities  are as
     follows:


                                              1995              1994
                                              ----              ----

Accounts receivable allowances        $     19,313      $     28,871
Deferred revenue                            42,169            30,472
Other liabilities                           14,393            10,525
State income taxes                              --             4,139
                                        -----------      ------------
Total deferred tax assets             $     75,875      $     74,007
                                        ===========      ============

Depreciation                          $      6,580       $     8,161 
State income taxes                           4,789                --
                                        -----------      ------------
Total deferred tax liabilities        $     11,369      $      8,161
                                        ===========      ============


     It is  management's  opinion  that the deferred tax assets will be realized
     through operations and that no valuation allowance is necessary.


10.  Major Customers and Segment Information:

     The Company  operates in one  industry  segment and  develops,  markets and
     supports network enhancement products.

     The Company's export revenues are all denominated in U.S. dollars,  and are
     summarized as follows:


                                                          
                                                   Year ended December 31,   
                                                -----------------------------
                                                    1995              1994
                                                    ----              ----


Europe                                         $   361,953      $    110,649
Asia                                               117,474                --
Canada                                             438,290           570,698
                                                -----------      ------------
                                               $   917,717      $    681,347
                                                ===========      ============

                                      F-37
<PAGE>



11. Contingency:

     The Company is a defendant in a legal action.  While the outcome  cannot be
     determined at this time,  management is of the opinion that the  liability,
     if any, resulting from this legal action will not have a material effect on
     the Company's financial position, results of operations or cash flows.


12. Fair Value of Financial Instruments:

     The following  methods and assumptions were used to estimate the fair value
     of each  class of  financial  instruments  for which it is  practicable  to
     estimate that value:

                                      Cash

     The carrying amount approximates fair value.

                               Accounts Receivable

     The carrying  value of the Company's  receivables is assumed to approximate
     fair value due to their short-term maturities.

                                  Notes Payable

     The Company's notes payable consists of a non-interest bearing note payable
     to another software company.  There is no established  market and it is not
     practicable to estimate the fair value of this financial instrument.


13.  Non-Monetary Transactions:

     The Company supplies its software at the current list price to customers in
     exchange  for  computer  software,  marketing,  advertising  and  telephone
     services.  Total revenue recorded in exchange for a corresponding  value of
     services  received during the years amounted to $59,054 and $23,531 in 1995
     and 1994, respectively.

                                      F-38
<PAGE>



14.  Subsequent Events:

     On August 12,  1996,  the Company  entered  into an agreement to merge with
     another company.  Pursuant to the terms of the merger agreement, each share
     of common and preferred  stock of the Company will be converted into common
     stock of Castelle,  a manufacturer of fax and print server  devices,  based
     upon a formula using the market price for Castelle at the date of closing.

                                      F-39
<PAGE>

                             IBEX TECHNOLOGIES, INC.
                                 BALANCE SHEETS
                                 (in thousands)
                                      -----
<TABLE>
<CAPTION>

                              ASSETS                                      June 30,        December 31,
                                                                            1996              1995
                                                                         (unaudited)
Current assets:
<S>                                                                 <C>                              <C>        
Cash                                                                $             279  $             138           
Accounts receivable, net of allowance for doubtful accounts of                    929                543
$15 in 1996 and 1995
Inventories                                                                        36                 41
Prepaid income taxes                                                               44                 45
Deferred income taxes                                                              65                 71
Prepaid expenses and other current assets                                           5                 34
                                                                        --------------   ----------------
Total current assets                                                            1,358                872

Property plant and equipment, net                                                 126                114
                                                                        --------------   ----------------
Total assets                                                        $           1,484  $             986                      
                                                                        ==============   ================

                           LIABILITIES
Current liabilities:
Notes payable                                                       $              25  $              75            
Accounts payable                                                                  135                 49
Accrued liabilities                                                                58                 14
Income taxes payable                                                              123
Accrued vacation                                                                   44                 44
Deferred revenue                                                                  145                 97
                                                                        --------------   ----------------
Total current liabilities                                                         530                279

Deferred income taxes                                                              30                  7
                                                                        --------------   ----------------
Total liabilities                                                                 560                286

                       SHAREHOLDERS' EQUITY
Preferred stock, no par value:
Authorized: 5,000
Issued and outstanding: 48 in 1996 and 1995                                       300                300
Common stock, no par value:
Authorized:  10,000 shares
Issued and outstanding:  138 shares in 1996 and 1995                               90                 90
Retained earnings                                                                 534                310
                                                                        --------------   ----------------

Total shareholders' equity                                                        924                700
                                                                        --------------   ----------------

Total liabilities and shareholders' equity                          $           1,484  $             986             
                                                                        ==============   ================

</TABLE>

     The accompanying notes are an integral part of these financial statements

                                      F-40
<PAGE>



                             IBEX TECHNOLOGIES, INC.
                              STATEMENTS OF INCOME
                      (in thousands, except per share data)

<TABLE>
<CAPTION>

                                                        6 MONTHS ENDED JUNE 30,            6 MONTHS ENDED JUNE 30,
                                                                 1996                               1995
                                                              (unaudited)                        (unaudited)

<S>                                                <C>                               <C>                              
Net sales                                          $                         2,075   $                           1,393

Cost of sales                                                                  444                                 355
                                                     ------------------------------    --------------------------------

Gross profit                                                                 1,631                               1,038
                                                     ------------------------------    --------------------------------

Operating expenses:

Research and development                                                       342                                 418

Sales and marketing                                                            760                                 660

General and administrative                                                     153                                 129
                                                     ------------------------------    --------------------------------

Total operating expenses                                                     1,255                               1,207
                                                     ------------------------------    --------------------------------

Operating income (loss)                                                        376                               (169)

Other income  (expense), net                                                    10                                 (5)
                                                     ------------------------------    --------------------------------

Income (loss)before provision for income taxes                                 386                               (174)

Provision for (benefit from) income taxes                                      162                                (21)
                                                     ------------------------------    --------------------------------

Net income                                         $                           224   $                           (153)
                                                     ==============================    ================================

Net income per share                               $                          1.11   $                          (1.13)
                                                     ==============================    ================================

Shares used in per share calculation                                           201                                 135
                                                     ==============================    ================================


</TABLE>

     The accompanying notes are an integral part of these financial statements

                                      F-41
<PAGE>





                             IBEX TECHNOLOGIES, INC.
                            STATEMENTS OF CASH FLOWS
                                 (in thousands)
<TABLE>
<CAPTION>

                                                             6 MONTHS ENDED JUNE 30,        6 MONTHS ENDED JUNE 30,
                                                                      1996                          1995
                                                                   (unaudited)                   (unaudited)
Cash flows from operating activities:
<S>                                                       <C>                          <C>                         
Net income (loss)                                         $                      224   $                       (153)
Adjustments to reconcile net income to net cash
provided by (used in) operating activities:
Depreciation                                                                      18                             18
Deferred tax provision                                                            29
Allowance for doubtful accounts and sales returns                                                               (30)
Research and development expenses paid by issuance of                                                           178
stock and a note
Changes in assets and liabilities:
Accounts receivable                                                             (386)                           156
Inventories                                                                        5                             23
Prepaid income taxes                                                               1
Prepaid expenses and other current assets                                         29                            (58)
Accounts payable                                                                  86                              2
Accrued liabilities                                                               44                              5
Accrued vacation                                                                                                  6
Income taxes payable                                                             123                           (109)
Deferred revenue                                                                  48                              5
                                                             ------------------------     --------------------------

Net cash provided by operating activities                                        221                             43
                                                             ------------------------     --------------------------

Cash flows from investing activities:
Acquisition of property and equipment                                            (30)                           (29)

Cash flows from financing activities:
Repayment of notes payable                                                       (50)                           (25)
Bank line of credit, net                                                                                         42
Proceeds from issuance of common stock                                                                            6
                                                             ------------------------     --------------------------

Net cash provided by (used in) financing activities                              (50)                            23
                                                             ------------------------     --------------------------

Net increase in cash and cash equivalents                                        141                             37

Cash and cash equivalents at beginning of period                                 138                             90
                                                             ------------------------     --------------------------

Cash and cash equivalents at end of period                $                      279   $                        127
                                                             ========================     ==========================

</TABLE>

     The accompanying notes are an integral part of these financial statements

                                      F-42
<PAGE>





                          NOTES TO FINANCIAL STATEMENTS


     1. Basis of Presentation

     The accompanying unaudited financial statements include the accounts of the
     Company  and have been  prepared  in  accordance  with  generally  accepted
     accounting  principles.  In the  opinion  of  management,  all  adjustments
     (consisting of normal recurring accruals)  considered  necessary for a fair
     presentation of the Company's financial position, results of operations and
     cash flows at the dates and for the periods  indicated  have been included.
     The  results  of  operations  for  the  interim  period  presented  are not
     necessarily  indicative  of the results for the year  ending  December  31,
     1996.  Because  all of  the  disclosures  required  by  generally  accepted
     accounting  principles  are not included in the  accompanying  consolidated
     financial  statements,  they should be read in conjunction with the audited
     consolidated  financial  statements  and  related  notes  included  in  the
     Company's Annual Report.


     2. Net Income Per Share

     Net income per share is based upon the  weighted  average  number of common
     and common  equivalent  shares  outstanding.  Common  equivalent shares and
     options are included in the per share calculation where the effect of their
     inclusion would be dilutive.


     3. Inventories

     Inventories are stated at the lower of cost (which  approximates  cost on a
     first-in, first-out basis) or market.

                          JUNE 30,                     DECEMBER 31,
                            1996                           1995

Finished goods      $               36           $                  41
                       ===============             ===================


                                      F-43

<PAGE>

<TABLE> <S> <C>

<ARTICLE>                                     5
<MULTIPLIER>                                  1,000 
       
<S>                                                     <C>
<PERIOD-TYPE>                                 6-MOS
<FISCAL-YEAR-END>                             DEC-31-1996
<PERIOD-END>                                  JUN-30-1996              
<CASH>                                                            279
<SECURITIES>                                                        0
<RECEIVABLES>                                                     944
<ALLOWANCES>                                                       15 
<INVENTORY>                                                        36 
<CURRENT-ASSETS>                                                1,358
<PP&E>                                                            213
<DEPRECIATION>                                                     87
<TOTAL-ASSETS>                                                  1,484
<CURRENT-LIABILITIES>                                             530
<BONDS>                                                             0
                                               0
                                                       300 
<COMMON>                                                           90
<OTHER-SE>                                                          0
<TOTAL-LIABILITY-AND-EQUITY>                                    1,484
<SALES>                                                         2,075
<TOTAL-REVENUES>                                                2,075
<CGS>                                                             444
<TOTAL-COSTS>                                                     444
<OTHER-EXPENSES>                                                1,255
<LOSS-PROVISION>                                                    0
<INTEREST-EXPENSE>                                                  0
<INCOME-PRETAX>                                                   386
<INCOME-TAX>                                                      162
<INCOME-CONTINUING>                                               224
<DISCONTINUED>                                                      0
<EXTRAORDINARY>                                                     0
<CHANGES>                                                           0
<NET-INCOME>                                                      224
<EPS-PRIMARY>                                                    1.11
<EPS-DILUTED>                                                    1.11
        
<PAGE>



</TABLE>




                                   APPENDIX A


 

                AGREEMENT AND PLAN OF REORGANIZATION AND MERGER

<PAGE>
                
 
         On August 22, 1996,  Castelle  ("Castelle"),  Ibex  Technologies,  Inc.
("Ibex") and certain  shareholders  of Ibex  executed an  Agreement  and Plan of
Merger,  dated as of August 22, 1996, pursuant to which Ibex will be merged with
and into  Castelle  (the  "Acquisition").  Upon the  Acquisition,  approximately
790,000  shares  of  Castelle   Common  Stock  will  be  issued  to  the  former
shareholders  of Ibex and  approximately  60,000 shares of Castelle Common Stock
will be reserved  for  issuance  upon the  exercise of Ibex  options  assumed by
Castelle.  The  transaction  is intended to be tax-free under Section 368 of the
Internal  Revenue  Code  of  1986,  as  amended,  and to be  accounted  for as a
pooling-of-interests.  The  transaction  remains  subject to  Castelle  and Ibex
shareholder approval and other closing conditions.

Item 7. Financial Statements, Pro Forma Financial Information and Exhibits.

     (c) The following  exhibits are furnished in accordance with the provisions
of Item 601 of Regulation S-K:

     Exhibit Number        Exhibit

        2.1                Agreement  and Plan of  Merger,  dated as of  August
                           22,  1996,  among Castelle,  Ibex  Technologies, Inc.
                           and Certain  Shareholders  of Ibex Technologies, Inc.

        20.1               Press Release issued August 23, 1996


                                       2

<PAGE>





                                    SIGNATURE

        Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized.


                                    CASTELLE



Dated:  August 30, 1996                       By: /s/ Randall I. Bambrough
                                                  ------------------------
                                                  Randall I. Bambrough
                                                  Vice President of Finance
                                                  and Chief Financial Officer


                                       3

<PAGE>


                                INDEX TO EXHIBITS



                                                               Page number in
                                                               sequentially
Exhibit No.    Description                                     numbered version

  2.1          Agreement  and  Plan  of  Reorganization                5
               dated as of August 22, 1996 among Castelle,
               Ibex Technologies, Inc. and Certain
               Shareholders of Ibex Technologies, Inc.
               (incorporated herein by reference to Exhibit
               2.01 to the Registrant's Registration 
               Statement on Form S-4, File No. 33-85840).

  20.1         Press Release dated August 23, 1996                    139

                                       4
                                     <PAGE>

                      AGREEMENT AND PLAN OF REORGANIZATION


                                     among:


                                    CASTELLE,
                            a California corporation;


                            IBEX TECHNOLOGIES, INC.,
                            a California corporation;


                                       and


                 CERTAIN SHAREHOLDERS OF IBEX TECHNOLOGIES, INC.





                           ---------------------------

                           Dated as of August 22, 1996
                           ---------------------------





                                       5

<PAGE>
<TABLE>
<CAPTION>

                                                                                                    

                                TABLE OF CONTENTS
                                   
                                                                                                                


 
                                                                                              

<S>     <C>                                                                                                       <C>
SECTION 1.        DESCRIPTION OF TRANSACTION.................................................................... 11
         1.1      Merger of Ibex into Castelle.................................................................. 11
         1.2      Effect of the Merger.......................................................................... 12
         1.3      Closing; Effective Time....................................................................... 12
         1.4      Articles of Incorporation and Bylaws; Directors and Officers.................................. 12
         1.5      Conversion of Shares.......................................................................... 12
         1.6      Employee Stock Options........................................................................ 13
         1.7      Closing of Ibex's Transfer Books.............................................................. 14
         1.8      Exchange of Certificates...................................................................... 14
         1.9      Dissenting Shares............................................................................. 15
         1.10     Tax Consequences.............................................................................. 16
         1.11     Accounting Treatment.......................................................................... 16
         1.12     Further Action................................................................................ 16

SECTION 2.        REPRESENTATIONS AND WARRANTIES OF IBEX AND THE DESIGNATED SHAREHOLDERS........................ 16
         2.1      Due Organization; No Subsidiaries; Etc........................................................ 16
         2.2      Articles of Incorporation and Bylaws; Records................................................. 17
         2.3      Capitalization, Etc........................................................................... 17
         2.4      Financial Statements.......................................................................... 18
         2.5      Absence of Changes............................................................................ 19
         2.6      Title to Assets............................................................................... 20
         2.7      Bank Accounts; Receivables.................................................................... 21
         2.8      Equipment; Leasehold.......................................................................... 21
         2.9      Proprietary Assets............................................................................ 21
         2.10     Contracts..................................................................................... 23
         2.11     Liabilities................................................................................... 25
         2.12     Compliance with Legal Requirements............................................................ 26
         2.13     Governmental Authorizations................................................................... 26
         2.14     Tax Matters................................................................................... 26
         2.15     Employee and Labor Matters; Benefit Plans..................................................... 27
         2.16     Environmental Matters......................................................................... 30
         2.17     Insurance..................................................................................... 30
         2.18     Related Party Transactions.................................................................... 31
         2.19     Legal Proceedings; Orders..................................................................... 31
         2.20     Authority; Binding Nature of Agreement........................................................ 32
         2.21     Non-Contravention; Consents................................................................... 32
         2.22     Full Disclosure............................................................................... 33

SECTION 3.        REPRESENTATIONS AND WARRANTIES OF CASTELLE.................................................... 33
         3.1      Due Organization; No Subsidiaries; Etc........................................................ 34

                                       6
</TABLE>

<PAGE>
<TABLE>
<CAPTION>

                                TABLE OF CONTENTS
                                  (continued)

<S>      <C>                                                                                                     <C>
         3.2      SEC Filings; Financial Statements............................................................. 34
         3.3      Capitalization, Etc........................................................................... 35
         3.4      Authority; Binding Nature of Agreement........................................................ 36
         3.5      Absence of Changes............................................................................ 36
         3.6      Title to Assets............................................................................... 38
         3.7      Proprietary Assets............................................................................ 38
         3.8      Liabilities................................................................................... 39
         3.9      Compliance with Legal Requirements............................................................ 39
         3.10     Governmental Authorizations................................................................... 40
         3.11     Tax Matters................................................................................... 40
         3.12     Employee and Labor Matters; Benefit Plans..................................................... 41
         3.13     Environmental Matters......................................................................... 41
         3.14     Legal Proceedings; Orders..................................................................... 41
         3.15     Non-Contravention; Consents................................................................... 42
         3.16     Full Disclosure............................................................................... 43
         3.17     Valid Issuance................................................................................ 43

SECTION 4.        CERTAIN COVENANTS OF IBEX AND THE DESIGNATED SHAREHOLDERS..................................... 44
         4.1      Access and Investigation...................................................................... 44
         4.2      Operation of Ibex's Business.................................................................. 44
         4.3      Notification; Updates to Disclosure Schedule.................................................. 46

SECTION 5.        ADDITIONAL COVENANTS OF THE PARTIES........................................................... 47
         5.1      Filings and Consents.......................................................................... 47
         5.2      California Permit; Fairness Hearing........................................................... 47
         5.3      Ibex Shareholders' Meeting.................................................................... 47
         5.4      Public Announcements.......................................................................... 47
         5.5      Pooling of Interests.......................................................................... 48
         5.6      Affiliate Agreements.......................................................................... 48
         5.7      Best Efforts.................................................................................. 48
         5.8      Tax Matters................................................................................... 48
         5.9      Employment and Noncompetition Agreements...................................................... 48
         5.10     FIRPTA Matters................................................................................ 48

SECTION 6.        CONDITIONS PRECEDENT TO OBLIGATIONS OF CASTELLE............................................... 49
         6.1      Satisfactory Completion of Pre-Acquisition Review............................................. 49
         6.2      Accuracy of Representations................................................................... 50
         6.3      Performance of Covenants...................................................................... 50
         6.4      Shareholder Approval.......................................................................... 50
</TABLE>

                                       7
<PAGE>
<TABLE>
<CAPTION>

                               TABLE OF CONTENTS
                                  (continued)


<S>      <C>                                                                                                     <C>
         6.5      Consents...................................................................................... 50
         6.6      Agreements and Documents...................................................................... 50
         6.7      FIRPTA Compliance............................................................................. 51
         6.8      Securities Compliance......................................................................... 51
         6.9      No Restraints................................................................................. 52
         6.10     Comfort Letter................................................................................ 52
         6.11     No Legal Proceedings.......................................................................... 52
         6.12     Amendment of Fourth Amended and Restated Registration......................................... 52


SECTION 7.        CONDITIONS PRECEDENT TO OBLIGATIONS OF IBEX................................................... 52
         7.1      Accuracy of Representations................................................................... 52
         7.2      Performance of Covenants...................................................................... 53
         7.3      Documents..................................................................................... 53
         7.4      Shareholder Approval.......................................................................... 53
         7.5      No Restraints................................................................................. 53
         7.6      Consents...................................................................................... 53
         7.7      Securities Compliance......................................................................... 53
         7.8      No Legal Proceedings.......................................................................... 54

SECTION 8.        TERMINATION................................................................................... 54
         8.1      Termination Events............................................................................ 54
         8.2      Termination Procedures........................................................................ 55
         8.3      Effect of Termination......................................................................... 55

SECTION 9.        INDEMNIFICATION, ETC.......................................................................... 55
         9.1      Survival of Representations, Etc.............................................................. 55
         9.2      Indemnification by Designated Shareholders.................................................... 56
         9.3      Threshold; Ceiling............................................................................ 56
         9.4      Escrow Fund................................................................................... 56
         9.5      No Contribution............................................................................... 57
         9.6      Interest...................................................................................... 57
         9.7      Defense of Third Party Claims................................................................. 57
         9.8      Exercise of Remedies by Indemnitees Other Than Castelle....................................... 58
         9.9      Claims Against Consideration.................................................................. 58
         9.10     Objections to Claims.......................................................................... 58
         9.11     Resolution of Conflicts; Arbitration.......................................................... 58

SECTION 10.       MISCELLANEOUS PROVISIONS...................................................................... 61

                                       8
</TABLE>

<PAGE>
<TABLE>
<CAPTION>

                               TABLE OF CONTENTS
                                  (continued)

<S>      <C>                                                                                                     <C>
         10.1     Designated Shareholders' Agent................................................................ 61
         10.2     Further Assurances............................................................................ 62
         10.3     Fees and Expenses............................................................................. 62
         10.4     Attorneys' Fees............................................................................... 62
         10.5     Notices....................................................................................... 62
         10.6     Confidentiality............................................................................... 64
         10.7     Time of the Essence........................................................................... 64
         10.8     Headings...................................................................................... 64
         10.9     Counterparts.................................................................................. 64
         10.10    Governing Law................................................................................. 64
         10.11    Successors and Assigns........................................................................ 64
         10.12    Remedies Cumulative; Specific Performance..................................................... 64
         10.13    Waiver........................................................................................ 65
         10.14    Amendments.................................................................................... 65
         10.15    Severability.................................................................................. 65
         10.16    Parties in Interest............................................................................65
         10.17    Entire Agreement.............................................................................. 65
         10.18    Construction.................................................................................. 65

                                       9
</TABLE>

<PAGE>





 
                           
                                    EXHIBITS

Exhibit A-1  -  Designated Shareholders

Exhibit A-2  -  Signing Shareholders

Exhibit B    -  Certain Definitions

Exhibit C-1  -  Form of Affiliate Agreement

Exhibit C-2  -  Persons to Execute Affiliate Agreements

Exhibit D    -  Forms of Tax Representation Letters

Exhibit E    -  Form of Continuity of Interest Certificate

Exhibit F    -  Persons to Sign Employment and Noncompetition Agreements

Exhibit G    -  Forms of Employment Agreements

Exhibit H    -  Forms of Noncompetition Agreements

Exhibit I    -  Form of Legal Opinion of Graham & James LLP

Exhibit J    -  Form of Legal Opinion of Cooley Godward Castro Huddleson & Tatum

Exhibit K    -  Not Used

Exhibit L    -  Escrow Agreement

Exhibit M    -  Form of Irrevocable Proxy

                                       10
                                     <PAGE>






  
                              
                                  AGREEMENT AND
                             PLAN OF REORGANIZATION


        THIS  AGREEMENT  AND PLAN OF  REORGANIZATION  ("Agreement")  is made and
entered  into as of August  22,  1996,  by and  among:  CASTELLE,  a  California
corporation ("Castelle"); IBEX TECHNOLOGIES, INC., a California corporation (the
"Ibex");  the parties identified on Exhibit A-1 (which are referred to herein as
the  "Designated  Shareholders")  and the  parties  identified  on  Exhibit  A-2
(collectively,  the  parties  identified  on Exhibit  A-1 and on Exhibit A-2 are
referred to herein as the "Signing  Shareholders").  Certain  other  capitalized
terms used in this Agreement are defined in Exhibit B.


                                    RECITALS

     A.  Castelle  and Ibex  intend to effect a merger of Ibex into  Castelle in
accordance  with this  Agreement  and the  California  General  Corporation  Law
("CGCL") (the "Merger").

     B. It is  intended  that the Merger  qualify  as a tax-free  reorganization
within the meaning of Section  368(a) of the Internal  Revenue Code of 1986,  as
amended (the "Code"). For accounting purposes, it is intended that the Merger be
treated as a "pooling of interests."

     C. This Agreement has been approved by the  respective  boards of directors
of Castelle and Ibex.

     D. The Designated  Shareholders  own a total of 96,000 shares of the Common
Stock  (with no par  value)  of Ibex  ("Ibex  Common  Stock");  and the  Signing
Shareholders  own a total of 96,000  shares of Ibex Common  Stock and a total of
48,035  shares of the Series A  Convertible  Preferred  Stock of Ibex ("Series A
Preferred Stock"),  constituting all of the outstanding preferred stock of Ibex.
Contemporaneously  with the  execution  and  delivery  of this  Agreement,  each
Signing Shareholder is executing and delivering to Castelle a Proxy of even date
herewith.


                                    AGREEMENT

        The parties to this Agreement agree as follows:

SECTION 1. DESCRIPTION OF TRANSACTION

     1.1  Merger  of Ibex into  Castelle.  Upon the  terms  and  subject  to the
conditions  set forth in this  Agreement,  at the Effective  Time (as defined in
Section  1.3),  Ibex shall be merged with and into  Castelle,  and the  separate
existence  of  Ibex  shall  cease.  Castelle  will  continue  as  the  surviving
corporation in the Merger (the "Surviving Corporation").

                                       11
<PAGE>

     1.2 Effect of the  Merger.  The Merger  shall have the effects set forth in
this  Agreement  and in the  applicable  provisions  of the  California  General
Corporation Law.

     1.3  Closing;   Effective  Time.  The   consummation  of  the  transactions
contemplated by this Agreement (the  "Closing")  shall take place at the offices
of Cooley Godward Castro  Huddleson & Tatum,  One Maritime Plaza, San Francisco,
California  94111 at 10:00 a.m. on September __, 1996, or at such other time and
date  during the period  from  August 15,  1996  through  December  30,  1996 as
Castelle may  designate  upon not less than five days' prior notice to Ibex (the
"Scheduled  Closing Time").  (The date on which the Closing actually takes place
is referred to in this Agreement as the "Closing Date.")  Contemporaneously with
or as promptly as practicable after the Closing,  a properly executed  agreement
of merger conforming to the requirements of Chapter 11 of the California General
Corporation  Law  shall be filed  with the  Secretary  of State of the  State of
California.  The Merger  shall become  effective  at the time such  agreement of
merger is filed  with and  accepted  by the  Secretary  of State of the State of
California (the "Effective Time").

     1.4 Articles of Incorporation  and Bylaws;  Directors and Officers.  Unless
otherwise determined by Castelle prior to the Effective Time:

     (a) the Articles of  Incorporation  of the Surviving  Corporation  shall be
     those of Castelle;

     (b) the Bylaws of the Surviving Corporation shall be those of Castelle; and

     (c) the  directors and officers of the  Surviving  Corporation  immediately
     after the  Effective  Time shall be those of Castelle  with the addition of
     Ney Grant as President of the Ibex Division of Castelle.

     1.5 Conversion of Shares.

     (a) Subject to Sections 1.8(c) and 1.9, at the Effective Time, by virtue of
     the Merger and without any further action on the part of Castelle,  Ibex or
     any shareholder of Ibex:

          (i) If the closing market price of a share of the common stock (no par
          value per share) of Castelle ("Castelle Common Stock") on the business
          day immediately prior to the Closing (the "Preference Price") is $9.42
          or greater, each share of Ibex Common Stock and each share of Series A
          Preferred Stock  outstanding  immediately  prior to the Effective Time
          shall  be converted  into  the right  to  receive  4.17731  shares  of
          Castelle Common Stock.

          (ii) If the  Preference  Price is less than $9.42,  (i) the  aggregate
          shares of Series A Preferred Stock  outstanding  immediately  prior to
          the  Effective  Time  shall be  converted  into a number  of shares of
          Castelle  Common  Stock  equal to $180,000  divided by the  Preference
          Price  (the  "Preferred  Bonus  Shares"),  and (ii) each share of Ibex
          Common  Stock and each share of Series A Preferred  Stock  outstanding
          immediately  prior to the  Effective  Time shall be  converted  into a
          number of shares of Castelle  Common  Stock equal to (x) 850,000  less

                                       12
<PAGE>

          the number of  Preferred  Bonus  Shares  divided by (y) the  aggregate
          number of shares of Ibex  Common  Stock and Series A  Preferred  Stock
          outstanding,  on a  fully  diluted  basis,  immediately  prior  to the
          Effective Time.

     (b) If any shares of Ibex Common Stock outstanding immediately prior to the
     Effective Time are unvested or are subject to a repurchase option,  risk of
     forfeiture  or  other  condition  under  any  applicable  restricted  stock
     purchase  agreement  or other  agreement  with  Ibex,  then the  shares  of
     Castelle  Common  Stock  issued in exchange  for such shares of Ibex Common
     Stock will also be unvested and subject to the same repurchase option, risk
     of forfeiture or other condition,  and the certificates  representing  such
     shares of Castelle Common Stock may accordingly be marked with  appropriate
     legends.

     1.6 Employee Stock Options.  At the Effective  Time, each stock option that
is then  outstanding  under  Ibex's 1992 Stock Option  Plan,  whether  vested or
unvested (a "Ibex Option"),  shall be assumed by Castelle in accordance with the
terms (as in  effect as of the date of this  Agreement)  of  Ibex's  1992  Stock
Option  Plan and the  stock  option  agreement  by which  such  Ibex  Option  is
evidenced.  All rights with respect to Ibex Common Stock under  outstanding Ibex
Options shall thereupon be converted into rights with respect to Castelle Common
Stock.  Accordingly,  from and after the  Effective  Time,  (a) each Ibex Option
assumed by Castelle may be exercised solely for shares of Castelle Common Stock,
(b) the number of shares of Castelle  Common Stock  subject to each such assumed
Ibex  Option  shall be equal to the number of shares of Ibex  Common  Stock that
were  subject  to such  Ibex  Option  immediately  prior to the  Effective  Time
multiplied by the Applicable Fraction (as hereinafter defined),  rounded down to
the nearest whole number of shares of Castelle  Common Stock,  (c) the per share
exercise price for the Castelle Common Stock issuable upon exercise of each such
assumed Ibex Option shall be determined by dividing the exercise price per share
of Ibex Common Stock subject to such Ibex Option, as in effect immediately prior
to the Effective Time, by the Applicable Fraction (as hereinafter defined),  and
rounding the resulting  exercise price up to the nearest whole cent, and (d) all
restrictions  on the exercise of each such assumed Ibex Option shall continue in
full force and effect, and the term, exercisability,  vesting schedule and other
provisions  of such Ibex Option  shall  otherwise  remain  unchanged;  provided,
however, that each such assumed Ibex Option shall, in accordance with its terms,
be subject to further  adjustment  as  appropriate  to reflect any stock  split,
reverse  stock  split,  stock  dividend,   recapitalization   or  other  similar
transaction  effected by Castelle  after the Effective  Time.  Ibex and Castelle
shall take all action that may be necessary (under Ibex's 1992 Stock Option Plan
and otherwise) to effectuate  the provisions of this Section 1.6.  Following the
Closing,  Castelle  will send to each holder of an assumed Ibex Option a written
notice  setting forth (i) the number of shares of Castelle  Common Stock subject
to such assumed Ibex Option,  and (ii) the exercise  price per share of Castelle
Common Stock issuable upon exercise of such assumed Ibex Option. For purposes of
this Section  1.6,  the  "Applicable  Fraction"  shall mean the  exchange  ratio
identified in Section 1.5 which is utilized to convert each share of Ibex Common
Stock outstanding immediately prior to the Merger into Castelle Common Stock.

                                       13
<PAGE>

     1.7 Closing of Ibex's Transfer  Books.  At the Effective  Time,  holders of
certificates  representing  shares of Ibex's capital stock that were outstanding
immediately  prior to the  Effective  Time  shall  cease to have any  rights  as
shareholders  of Ibex, and the stock transfer books of Ibex shall be closed with
respect to all shares of such capital stock outstanding immediately prior to the
Effective  Time. No further  transfer of any such shares of Ibex's capital stock
shall be made on such stock transfer  books after the Effective  Time. If, after
the Effective  Time, a valid  certificate  previously  representing  any of such
shares of Ibex's capital stock (a "Ibex Stock  Certificate") is presented to the
Surviving  Corporation,  such Ibex Stock Certificate shall be canceled and shall
be exchanged as provided in Section 1.8.

     1.8 Exchange of  Certificates. 

     (a) At or as soon as practicable  after the Effective  Time,  Castelle will
     send to the holders of Ibex Stock  Certificates (i) a letter of transmittal
     in customary form and containing such provisions as Castelle may reasonably
     specify,  and (ii)  instructions for use in effecting the surrender of Ibex
     Stock  Certificates  in exchange  for  certificates  representing  Castelle
     Common Stock.  Upon  surrender of a Ibex Stock  Certificate to Castelle for
     exchange,  together with a duly  executed  letter of  transmittal  and such
     other  documents as may be reasonably  required by Castelle,  the holder of
     such Ibex Stock  Certificate  shall be  entitled  to  receive  in  exchange
     therefor a certificate  representing the number of whole shares of Castelle
     Common  Stock that such  holder has the right to  receive  pursuant  to the
     provisions  of this Section 1, and Ibex Stock  Certificate  so  surrendered
     shall be canceled.  Until  surrendered as contemplated by this Section 1.8,
     each Ibex Stock Certificate  shall be deemed,  from and after the Effective
     Time,  to  represent  only the  right to  receive  upon  such  surrender  a
     certificate  representing shares of Castelle Common Stock (and cash in lieu
     of any fractional  share of Castelle  Common Stock) as contemplated by this
     Section 1.8. If any Ibex Stock  Certificate shall have been lost, stolen or
     destroyed,  Castelle may, in its discretion and as a condition precedent to
     the issuance of any certificate representing Castelle Common Stock, require
     the owner of such  lost,  stolen or  destroyed  Ibex Stock  Certificate  to
     provide  an  appropriate  affidavit  and to  deliver a bond (in such sum as
     Castelle may reasonably  direct) as indemnity against any claim that may be
     made  against the  Surviving  Corporation  with  respect to such Ibex Stock
     Certificate.

     (b) No  dividends or other  distributions  declared or made with respect to
     Castelle  Common Stock with a record date after the Effective Time shall be
     paid to the holder of any unsurrendered Ibex Stock Certificate with respect
     to the shares of Castelle  Common Stock  represented  thereby,  and no cash
     payment in lieu of any  fractional  share shall be paid to any such holder,
     until such holder surrenders such Ibex Stock Certificate in accordance with
     this  Section 1.8 (at which time such  holder  shall be entitled to receive
     all such dividends and distributions and such cash payment).

     (c) No  fractional  shares  of  Castelle  Common  Stock  shall be issued in
     connection  with the Merger,  and no  certificates  for any such fractional
     shares shall be issued.  In lieu of such fractional  shares,  any holder of
     capital stock of Ibex who would otherwise be entitled to receive a fraction
     of a share of Castelle  Common  Stock  (after  aggregating  all  fractional
     shares of Castelle  Common  Stock  issuable  to such  holder)  shall,  upon

                                       14
<PAGE>


     surrender of such holder's Ibex Stock  Certificate(s),  be paid in cash the
     dollar  amount  (rounded  to the nearest  whole  cent),  without  interest,
     determined by multiplying  such fraction by the  Designated  Castelle Stock
     Price.  For purposes of this  paragraph,  the  "Designated  Castelle  Stock
     Price" shall be eight dollars ($8.00) per share of Castelle Common Stock.

     (d) The Surviving Corporation shall be entitled to deduct and withhold from
     any consideration  payable or otherwise deliverable to any holder or former
     holder of capital stock of Ibex pursuant to this  Agreement such amounts as
     the Surviving  Corporation may be required to deduct or withhold  therefrom
     under the Code or under any  provision of state,  local or foreign tax law.
     To the extent such amounts are so deducted or withheld,  such amounts shall
     be treated for all purposes under this Agreement as having been paid to the
     Person to whom such amounts would otherwise have been paid.

     (e) The Surviving  Corporation  shall not be liable to any holder or former
     holder of capital stock of Ibex for any shares of Castelle Common Stock (or
     dividends or distributions with respect thereto),  or for any cash amounts,
     delivered  to any public  official  pursuant  to any  applicable  abandoned
     property, escheat or similar law.

     1.9 Dissenting Shares.

     (a)  Notwithstanding  anything to the contrary contained in this Agreement,
     any shares of capital stock of Ibex that, as of the Effective  Time, are or
     may become "dissenting shares" within the meaning of Section 1300(b) of the
     California  Corporations  Code shall not be converted into or represent the
     right to receive  Castelle  Common Stock in accordance with Section 1.5 (or
     cash in lieu of fractional  shares in accordance with Section 1.8(c)),  and
     the holder or holders of such shares shall be entitled  only to such rights
     as may be granted to such holder or holders in Chapter 13 of the California
     General Corporation Law; provided,  however, that if the status of any such
     shares as "dissenting shares" shall not be perfected, or if any such shares
     shall lose their status as  "dissenting  shares,"  then, as of the later of
     the Effective Time or the time of the failure to perfect such status or the
     loss of such status,  such shares shall automatically be converted into and
     shall  represent  only the  right to  receive  (upon the  surrender  of the
     certificate or certificates representing such shares) Castelle Common Stock
     in accordance  with Section 1.5 (and cash in lieu of  fractional  shares in
     accordance with Section 1.8(c)).

     (b) Ibex  shall  give  Castelle  (i) prompt  notice of any  written  demand
     received by Ibex prior to the  Effective  Time to require  Ibex to purchase
     shares of capital  stock of Ibex  pursuant to Chapter 13 of the  California
     General  Corporation  Law and of any other  demand,  notice  or  instrument
     delivered to Ibex prior to the Effective  Time  pursuant to the  California
     General  Corporation  Law, and (ii) the  opportunity  to participate in all
     negotiations  and  proceedings  with respect to any such demand,  notice or
     instrument.  Ibex shall not make any payment or  settlement  offer prior to
     the Effective  Time with respect to any such demand unless  Castelle  shall
     have consented in writing to such payment or settlement offer.

                                       15
<PAGE>



     1.10 Tax  Consequences.  For  federal  income tax  purposes,  the Merger is
intended to constitute a reorganization within the meaning of Section 368 of the
Code.  The parties to this  Agreement  hereby adopt this Agreement as a "plan of
reorganization"  within the meaning of Sections 1.368-2(g) and 1.368-3(a) of the
United States Treasury Regulations.

     1.11 Accounting Treatment.  For accounting purposes, the Merger is intended
to be treated as a "pooling of interests."

     1.12 Further Action.  If, at any time after the Effective Time, any further
action is  determined  by Castelle to be necessary or desirable to carry out the
purposes of this Agreement or to vest the Surviving Corporation with full right,
title and possession of and to all rights and property of Ibex, the officers and
directors of the Surviving Corporation shall be fully authorized (in the name of
Ibex and otherwise) to take such action.

SECTION  2.   REPRESENTATIONS   AND   WARRANTIES  OF  IBEX  AND  THE  DESIGNATED
SHAREHOLDERS

     Ibex and the Designated  Shareholders  severally  represent and warrant, to
and for the benefit of the Indemnitees, as follows:

     2.1 Due Organization; No Subsidiaries; Etc.

     (a) Ibex is a  corporation  duly  organized,  validly  existing and in good
     standing  under the laws of the State of  California  and has all necessary
     power and authority: (i) to conduct its business in the manner in which its
     business is currently  being  conducted;  (ii) to own and use its assets in
     the manner in which its assets are currently  owned and used;  and (iii) to
     perform its obligations under all Ibex Contracts.

     (b) Except as set forth in Part 2.1 of the  Disclosure  Schedule,  Ibex has
     not conducted any business  under or otherwise  used, for any purpose or in
     any  jurisdiction,  any fictitious name,  assumed name, trade name or other
     name, other than the name "Ibex Technologies, Inc."

     (c)  Ibex is not and has not been  required  to be  qualified,  authorized,
     registered  or  licensed to do  business  as a foreign  corporation  in any
     jurisdiction  other than the  jurisdictions  identified  in Part 2.1 of the
     Disclosure  Schedule,   except  where  the  failure  to  be  so  qualified,
     authorized, registered or licensed has not had and will not have a Material
     Adverse Effect on Ibex.  Ibex is in good standing as a foreign  corporation
     in each of the  jurisdictions  identified  in  Part  2.1 of the  Disclosure
     Schedule.

     (d) Part 2.1 of the Disclosure Schedule accurately sets forth (i) the names
     of the members of Ibex's board of directors,  (ii) the names of the members
     of each  committee  of Ibex's board of  directors,  and (iii) the names and
     titles of Ibex's officers.

                                       16
<PAGE>


     (e) Ibex does not own any  controlling  interest in any Entity and,  except
     for the equity interests identified in Part 2.1 of the Disclosure Schedule,
     Ibex has  never  owned,  beneficially  or  otherwise,  any  shares or other
     securities  of, or any direct or indirect  equity  interest in, any Entity.
     Ibex has not agreed and is not  obligated to make any future  investment in
     or capital  contribution to any Entity.  Ibex has not guaranteed and is not
     responsible or liable for any obligation of any of the Entities in which it
     owns or has owned any equity interest.

     2.2 Articles of Incorporation  and Bylaws;  Records.  Ibex has delivered to
Castelle  accurate and complete copies of: (1) Ibex's articles of  incorporation
and bylaws, including all amendments thereto; (2) the stock records of Ibex; and
(3) except as set forth in Part 2.2 of the Disclosure Schedule,  the minutes and
other records of the meetings and other proceedings (including any actions taken
by written consent or otherwise  without a meeting) of the shareholders of Ibex,
the board of directors of Ibex and all  committees  of the board of directors of
Ibex.  There  have  been  no  formal  meetings  or  other   proceedings  of  the
shareholders  of Ibex,  the board of directors  of Ibex or any  committee of the
board of directors of Ibex that are not fully reflected in such minutes or other
records.  There has not been any  violation of any of the  provisions  of Ibex's
articles of incorporation  or bylaws,  and Ibex has not taken any action that is
inconsistent  in any  material  respect  with any  resolution  adopted by Ibex's
shareholders,  Ibex's  board of  directors  or any  committee of Ibex's board of
directors.  The books of account, stock records,  minute books and other records
of Ibex are accurate, up-to-date and complete in all material respects, and have
been maintained in accordance with prudent business practices.

     2.3 Capitalization, Etc.

     (a) The  authorized  capital  stock of Ibex  consists  of: (i) ten  million
     (10,000,000)  shares  of Common  Stock  (with no par  value),  of which one
     hundred  forty-one  thousand sixteen  (141,016) shares have been issued and
     are  outstanding  as of the date of this  Agreement;  and (ii) five million
     (5,000,000)  shares of  Preferred  Stock (with no par  value),  forty-eight
     thousand  thirty-five  (48,035)  of which  have been  designated  "Series A
     Preferred  Stock,"  of which all of such  shares  have been  issued and are
     outstanding as of the date of this  Agreement.  Each  outstanding  share of
     Series A  Preferred  Stock is  convertible  into one  share of Ibex  Common
     Stock.  All of the  outstanding  shares of Ibex  Common  Stock and Series A
     Preferred Stock have been duly authorized and validly issued, and are fully
     paid and  non-assessable.  Part 2.3 of the Disclosure  Schedule provides an
     accurate and complete  description of the terms of each  repurchase  option
     which is held by Ibex and to which any of such shares is subject.

     (b) Ibex has reserved 20,000 shares of Ibex Common Stock for issuance under
     its 1992 Stock Option Plan, of which options to purchase  14,731 shares are
     outstanding  as of the date of this  Agreement.  Part 2.3 of the Disclosure
     Schedule  accurately  sets forth,  with respect to each Ibex Option that is
     outstanding as of the date of this Agreement: (i) the name of the holder of
     such Ibex Option; (ii) the total number of shares of Ibex Common Stock that
     are  subject to such Ibex  Option  and the number of shares of Ibex  Common
     Stock with  respect to which such Ibex Option is  immediately  exercisable;
     (iii) the date on which such Ibex  Option was  granted and the term of such
     Ibex  Option;  (iv) the  vesting  schedule  for such Ibex  Option;  (v) the

                                       17
<PAGE>


     exercise price per share of Ibex Common Stock  purchasable  under such Ibex
     Option; and (vi) whether such Ibex Option has been designated an "incentive
     stock option" as defined in Section 422 of the Code. Except as set forth in
     Part  2.3  of  the  Disclosure  Schedule,  there  is  no:  (i)  outstanding
     subscription,  option,  call,  warrant or right  (whether or not  currently
     exercisable) to acquire any shares of the capital stock or other securities
     of Ibex; (ii) outstanding security, instrument or obligation that is or may
     become convertible into or exchangeable for any shares of the capital stock
     or other  securities  of Ibex;  (iii)  Contract  under which Ibex is or may
     become obligated to sell or otherwise issue any shares of its capital stock
     or any other  securities;  or (iv) to the best of the knowledge of Ibex and
     the Designated  Shareholders,  condition or circumstance that may give rise
     to or  provide a basis for the  assertion  of a claim by any  Person to the
     effect  that such  Person is  entitled  to acquire or receive any shares of
     capital stock or other securities of Ibex.

     (c) All  outstanding  shares of Ibex  Common  Stock and Series A  Preferred
     Stock,  and all outstanding  Ibex Options,  have been issued and granted in
     compliance  with (i) all applicable  securities  laws and other  applicable
     Legal  Requirements,  and (ii) all  requirements  set  forth in  applicable
     Contracts.

     (d) Except as set forth in Part 2.3 of the  Disclosure  Schedule,  Ibex has
     never repurchased,  redeemed or otherwise  reacquired any shares of capital
     stock or other  securities  of Ibex.  All  securities so reacquired by Ibex
     were  reacquired in compliance  with (i) the  applicable  provisions of the
     California   General   Corporation  Law  and  all  other  applicable  Legal
     Requirements,  and (ii) all requirements set forth in applicable restricted
     stock purchase agreements and other applicable Contracts.

     2.4 Financial Statements.

     (a) Ibex has delivered to Castelle the following  financial  statements and
     notes (collectively, the "Ibex Financial Statements"):

          (i) The audited  balance  sheets of Ibex as of  December  31, 1995 and
          1994,  and  the  related  audited  income  statements,  statements  of
          shareholders'  equity  and  statements  of cash  flows of Ibex for the
          years then ended,  together with the notes thereto and the unqualified
          report and opinion of Coopers & Lybrand LLP relating thereto; and

          (ii) the  unaudited  balance  sheet of Ibex as of June 30,  1996  (the
          "Unaudited  Interim Balance Sheet"),  and the related unaudited income
          statement of Ibex for the six months then ended.

     (b) Ibex  Financial  Statements  are  accurate and complete in all material
     respects  and  present  fairly  the  financial  position  of Ibex as of the
     respective  dates thereof and the results of operations and (in the case of
     the financial  statements  referred to in Section  2.4(a)(i)) cash flows of
     Ibex for the periods covered thereby.  Ibex Financial  Statements have been
     prepared  in  accordance  with  generally  accepted  accounting  principles
     applied on a consistent  basis  throughout the periods covered (except that

                                       18
<PAGE>


     the financial  statements  referred to in Section 2.4(a)(ii) do not contain
     footnotes  and  are  subject  to  normal  and  recurring   year-end   audit
     adjustments,  which will not, individually or in the aggregate, be material
     in magnitude).

     2.5 Absence of Changes.  Except as set forth in Part 2.5 of the  Disclosure
Schedule, since June 30, 1996:

     (a)  there has not been any  material  adverse  change in Ibex's  business,
     condition,  assets,  liabilities,   operations,  financial  performance  or
     prospects,  and, to the best of the  knowledge  of Ibex and the  Designated
     Shareholders,  no event has  occurred  that will,  or could  reasonably  be
     expected to, have a Material Adverse Effect on Ibex;

     (b) there has not been any material loss,  damage or destruction to, or any
     material  interruption  in the use of, any of Ibex's assets (whether or not
     covered by insurance);

     (c) Ibex has not declared,  accrued, set aside or paid any dividend or made
     any other  distribution in respect of any shares of capital stock,  and has
     not  repurchased,  redeemed or otherwise  reacquired  any shares of capital
     stock or other securities;

     (d) Ibex has not sold, issued or authorized the issuance of (i) any capital
     stock or other  security  (except  for Ibex  Common  Stock  issued upon the
     exercise of outstanding Ibex Options),  (ii) any option or right to acquire
     any capital stock or any other security (except for Ibex Options  described
     in  Part  2.3  of  the  Disclosure  Schedule),   or  (iii)  any  instrument
     convertible into or exchangeable for any capital stock or other security;

     (e) Ibex has not amended or waived any of its rights  under,  or  permitted
     the  acceleration  of vesting  under,  (i) any  provision of its 1992 Stock
     Option Plan, (ii) any provision of any agreement evidencing any outstanding
     Ibex Option, or (iii) any restricted stock purchase agreement;

     (f) there has been no  amendment  to Ibex's  articles of  incorporation  or
     bylaws,  and  Ibex  has not  effected  or been a party  to any  Acquisition
     Transaction,  recapitalization,  reclassification  of shares,  stock split,
     reverse stock split or similar transaction;

     (g) Ibex has not formed any  subsidiary or acquired any equity  interest or
     other interest in any other Entity;

     (h) Ibex has not made any  capital  expenditure  which,  when  added to all
     other  capital  expenditures  made on behalf of Ibex since  June 30,  1996,
     exceeds $10,000;

     (i) Ibex has not (i) entered into or  permitted  any of the assets owned or
     used by it to become  bound by any Contract  that is or would  constitute a
     Material  Contract  (as  defined in Section  2.10(a)),  or (ii)  amended or
     prematurely  terminated,  or waived any material right or remedy under, any
     such Contract;

                                       19
<PAGE>



     (j) Ibex has not (i) acquired,  leased or licensed any right or other asset
     from any other  Person,  (ii) sold or  otherwise  disposed of, or leased or
     licensed,  any right or other asset to any other Person, or (iii) waived or
     relinquished  any right,  except for immaterial  rights or other immaterial
     assets acquired,  leased, licensed or disposed of in the ordinary course of
     business and consistent with Ibex's past practices;

     (k)  Ibex  has  not  written  off  as  uncollectible,  or  established  any
     extraordinary  reserve  with  respect to, any account  receivable  or other
     indebtedness;

     (l)  Ibex  has not  made  any  pledge  of any of its  assets  or  otherwise
     permitted any of its assets to become  subject to any  Encumbrance,  except
     for pledges of  immaterial  assets made in the ordinary  course of business
     and consistent with Ibex's past practices;

     (m) Ibex has not (i) lent  money to any  Person  (other  than  pursuant  to
     routine  travel  advances  made to  employees  in the  ordinary  course  of
     business),  or (ii) incurred or guaranteed  any  indebtedness  for borrowed
     money;

     (n) Ibex has not (i) established or adopted any Employee Benefit Plan, (ii)
     paid  any  bonus or made any  profit-sharing  or  similar  payment  to,  or
     increased the amount of the wages, salary, commissions,  fringe benefits or
     other  compensation  or  remuneration  payable  to,  any of its  directors,
     officers or employees, or (iii) hired any new employee;

     (o) Ibex has not  changed any of its methods of  accounting  or  accounting
     practices in any respect;

     (p) Ibex has not made any Tax election;

     (q) Ibex has not commenced or settled any Legal Proceeding;

     (r) Ibex has not entered into any material  transaction  or taken any other
     material  action  outside the ordinary  course of business or  inconsistent
     with its past practices; and

     (s) Ibex has not agreed or committed to take any of the actions referred to
     in clauses "(c)" through "(r)" above.

     2.6 Title to Assets.

     (a) Ibex  owns,  and has good,  valid and  marketable  title to, all assets
     purported  to be owned by it,  including:  (i) all assets  reflected on the
     Unaudited  Interim Balance Sheet; (ii) all assets referred to in Parts 2.1,
     2.7, 2.8 and 2.9 of the Disclosure  Schedule and all of Ibex's rights under
     the Contracts identified in Part 2.10 of the Disclosure Schedule; and (iii)
     all other  assets  reflected  in Ibex's books and records as being owned by
     Ibex.  Except as set forth in Part 2.6 of the Disclosure  Schedule,  all of
     said  assets  are  owned  by Ibex  free  and  clear  of any  liens or other

                                       20
<PAGE>


     Encumbrances,  except  for (x) any lien for  current  taxes not yet due and
     payable,  and (y) minor  liens that have arisen in the  ordinary  course of
     business  and  that  do not (in any  case or in the  aggregate)  materially
     detract from the value of the assets subject  thereto or materially  impair
     the operations of Ibex.

     (b) Part 2.6 of the  Disclosure  Schedule  identifies  all assets  that are
     material to the  business of Ibex and that are being  leased or licensed to
     Ibex.

     2.7 Bank Accounts; Receivables.

     (a) Part 2.7(a) of the Disclosure  Schedule provides  accurate  information
     with  respect to each account  maintained  by or for the benefit of Ibex at
     any bank or other financial institution.

     (b) Part  2.7(b)  of the  Disclosure  Schedule  provides  an  accurate  and
     complete breakdown and aging of all accounts  receivable,  notes receivable
     and other  receivables of Ibex as of June 30, 1996.  Except as set forth in
     Part 2.7(b) of the Disclosure Schedule, all existing accounts receivable of
     Ibex  (including  those  accounts  receivable  reflected  on the  Unaudited
     Interim  Balance Sheet that have not yet been  collected and those accounts
     receivable  that  have  arisen  since  June 30,  1996 and have not yet been
     collected)  (i) represent  valid  obligations  of customers of Ibex arising
     from  bona  fide  transactions  entered  into  in the  ordinary  course  of
     business, (ii) are current and to the best of the knowledge of Ibex and the
     Designated  Shareholders  will be collected  in full when due,  without any
     counterclaim  or set off (net of an allowance for doubtful  accounts as set
     forth in the Ibex Financial Statements).

     2.8 Equipment; Leasehold.

     (a) All material items of equipment and other  tangible  assets owned by or
     leased to Ibex are  adequate  for the uses to which they are being put, are
     in good  condition  and repair  (ordinary  wear and tear  excepted) and are
     adequate  for the  conduct of Ibex's  business  in the manner in which such
     business is currently being conducted.

     (b) Ibex does not own any real  property or any interest in real  property,
     except for the leasehold  created under the real property lease  identified
     in Part 2.10 of the Disclosure Schedule.

     2.9 Proprietary Assets.

     (a) Part 2.9(a)(i) of the Disclosure  Schedule sets forth,  with respect to
     each Ibex Proprietary  Asset  registered with any Governmental  Body or for
     which an application has been filed with any Governmental Body, (i) a brief
     description  of  such  Proprietary   Asset,  and  (ii)  the  names  of  the
     jurisdictions covered by the applicable  registration or application.  Part
     2.9(a)(ii)  of the  Disclosure  Schedule  identifies  and  provides a brief
     description  of all  other  Ibex  Proprietary  Assets  owned by Ibex.  Part
     2.9(a)(iii)  of the  Disclosure  Schedule  identifies  and provides a brief
     description  of each  Proprietary  Asset  licensed  to  Ibex by any  Person

                                       21
<PAGE>

     (except for any Proprietary  Asset that is licensed to Ibex under any third
     party software license generally  available to the public at a cost of less
     than  $10,000),  and  identifies  the  license  agreement  under which such
     Proprietary  Asset is being  licensed to Ibex.  Except as set forth in Part
     2.9(a)(iv) of the Disclosure Schedule,  Ibex has good, valid and marketable
     title to all of Ibex Proprietary  Assets  identified in Parts 2.9(a)(i) and
     2.9(a)(ii)  of the  Disclosure  Schedule,  free and  clear of all liens and
     other  Encumbrances,  and has a valid right to use all  Proprietary  Assets
     identified in Part  2.9(a)(iii) of the Disclosure  Schedule.  Except as set
     forth in Part 2.9(a)(v) of the Disclosure  Schedule,  Ibex is not obligated
     to make any  payment  to any  Person  for the use of any  Ibex  Proprietary
     Asset.  Except as set forth in Part 2.9(a)(vi) of the Disclosure  Schedule,
     Ibex has not developed  jointly with any other Person any Ibex  Proprietary
     Asset with respect to which such other Person has any rights.

     (b) Ibex has taken all  reasonable  measures and  precautions  necessary to
     protect  and  maintain  the   confidentiality   and  secrecy  of  all  Ibex
     Proprietary  Assets  (except Ibex  Proprietary  Assets whose value would be
     unimpaired by public  disclosure) and otherwise to maintain and protect the
     value of all Ibex Proprietary Assets. Except as set forth in Part 2.9(b) of
     the  Disclosure  Schedule,  to the  best of the  knowledge  of Ibex and the
     Designated  Shareholders  after inquiry of Ibex's  officers,  directors and
     advisors,   Ibex  has  not  (other  than  pursuant  to  license  agreements
     identified in Part 2.10 of the Disclosure  Schedule) disclosed or delivered
     to any Person,  or permitted  the  disclosure or delivery to any Person of,
     (i) the source code,  or any portion or aspect of the source  code,  of any
     Ibex  Proprietary  Asset, or (ii) the object code, or any portion or aspect
     of the object code, of any Ibex Proprietary Asset.

     (c) To the best of the  knowledge of Ibex and the  Designated  Shareholders
     after inquiry of Ibex's  officers,  directors  and  advisors,  none of Ibex
     Proprietary  Assets infringes or conflicts with any Proprietary Asset owned
     or used by any other  Person.  To the best of the knowledge of Ibex and the
     Designated  Shareholders  after inquiry of Ibex's  officers,  directors and
     advisors,  Ibex is not infringing,  misappropriating or making any unlawful
     use of, and Ibex has not at any time infringed, misappropriated or made any
     unlawful use of, or received any notice or other  communication (in writing
     or otherwise) of any actual,  alleged,  possible or potential infringement,
     misappropriation or unlawful use of, any Proprietary Asset owned or used by
     any other Person.  To the best of the knowledge of Ibex and the  Designated
     Shareholders, no other Person is infringing, misappropriating or making any
     unlawful use of, and no Proprietary Asset owned or used by any other Person
     infringes or conflicts with, any Ibex Proprietary Asset.

     (d) Except as set forth in Part 2.9(d) of the Disclosure Schedule: (i) each
     Ibex  Proprietary   Asset  conforms  in  all  material  respects  with  any
     specification,   documentation,  performance  standard,  representation  or
     statement  made or provided  with respect  thereto by or on behalf of Ibex;
     and (ii)  there  has not been any  claim by any  customer  or other  Person
     alleging that any Ibex  Proprietary  Asset  (including each version thereof
     that has ever been  licensed or  otherwise  made  available  by Ibex to any
     Person) does not conform in all material  respects with any  specification,
     documentation,  performance  standard,  representation or statement made or
     provided by or on behalf of Ibex, and, to the best of the knowledge of Ibex
     and the Designated Shareholders, there is no basis for any such claim. Ibex
     has established adequate reserves on the Unaudited Interim Balance Sheet to

                                       22
<PAGE>

     cover all costs  associated  with any  obligations  that Ibex may have with
     respect to the correction or repair of programming  errors or other defects
     in Ibex Proprietary Assets.

     (e) Ibex Proprietary Assets constitute all the Proprietary Assets necessary
     to enable Ibex to conduct its business in the manner in which such business
     has been and is being conducted.  Except as set forth in Part 2.9(e) of the
     Disclosure  Schedule,  (i) Ibex has not  licensed  any of Ibex  Proprietary
     Assets to any Person on an exclusive  basis,  and (ii) Ibex has not entered
     into any  covenant  not to  compete or  Contract  limiting  its  ability to
     exploit fully any of its Proprietary  Assets or to transact business in any
     market or geographical area or with any Person.

     (f) Except as set forth in Part 2.9(f) of the Disclosure Schedule,  (i) all
     current and former employees of Ibex have executed and delivered to Ibex an
     agreement  (containing no exceptions to or exclusions from the scope of its
     coverage)  that is  substantially  identical  to the  form of  Confidential
     Information  and Invention  Assignment  Agreement  previously  delivered to
     Castelle,  and (ii) all  current  and former  consultants  and  independent
     contractors  to Ibex  have  executed  and  delivered  to Ibex an  agreement
     (containing no exceptions to or exclusions  from the scope of its coverage)
     that is substantially  identical to the standard form of proprietary rights
     agreement previously delivered to Castelle.

     2.10 Contracts.

     (a) Part 2.10 of the Disclosure Schedule identifies:

          (i)  each  Ibex  Contract  relating  to  the  employment  of,  or  the
          performance  of services by, any employee,  consultant or  independent
          contractor;

          (ii) each Ibex Contract  relating to the acquisition,  transfer,  use,
          development,  sharing or license of any technology or any  Proprietary
          Asset;

          (iii) each Ibex Contract  imposing any  restriction on Ibex's right or
          ability  (A) to compete  with any other  Person,  (B) to  acquire  any
          product or other asset or any services from any other Person,  to sell
          any product or other asset to or perform  any  services  for any other
          Person or to transact  business  or deal in any other  manner with any
          other Person, or (C) develop or distribute any technology;

          (iv) each Ibex Contract creating or involving any agency relationship,
          distribution arrangement or franchise relationship;

          (v) each  Ibex  Contract  relating  to the  acquisition,  issuance  or
          transfer of any securities;

          (vi) each Ibex  Contract  relating to the creation of any  Encumbrance
          with respect to any asset of Ibex;

                                       23
<PAGE>


          (vii) each Ibex Contract involving or incorporating any guaranty,  any
          pledge,  any  performance  or  completion  bond,  any indemnity or any
          surety arrangement;

          (viii) each Ibex Contract  creating or relating to any  partnership or
          joint venture or any sharing of revenues,  profits,  losses,  costs or
          liabilities;

          (ix)  each  Ibex  Contract  relating  to the  purchase  or sale of any
          product or other asset by or to, or the performance of any services by
          or for, any Related Party (as defined in Section 2.18);

          (x) each  Ibex  Contract  constituting  or  relating  to a  Government
          Contract or Government Bid;

          (xi) any  other  Ibex  Contract  that was  entered  into  outside  the
          ordinary  course of  business  or was  inconsistent  with  Ibex's past
          practices;

          (xii) any other Ibex Contract that has a term of more than 60 days and
          that may not be terminated by Ibex  (without  penalty)  within 60 days
          after the delivery of a termination notice by Ibex; and

          (xiii) any other Ibex Contract that  contemplates  or involves (A) the
          payment or  delivery  of cash or other  consideration  in an amount or
          having a value in  excess  of  $10,000  in the  aggregate,  or (B) the
          performance  of  services  having a value in excess of  $10,000 in the
          aggregate.

(Contracts  in the  respective  categories  described in clauses  "(i)"  through
"(xiii)" above are referred to in this Agreement as "Material Contracts.")

     (b) Ibex has  delivered to Castelle  accurate  and  complete  copies of all
     written  Contracts  identified  in Part  2.10 of the  Disclosure  Schedule,
     including all  amendments  thereto.  Part 2.10 of the  Disclosure  Schedule
     provides an accurate description of the terms of each Ibex Contract that is
     not  in  written  form.  Each  Contract  identified  in  Part  2.10  of the
     Disclosure Schedule is valid and in full force and effect, and, to the best
     of the knowledge of Ibex and the Designated Shareholders, is enforceable by
     Ibex  in  accordance  with  its  terms,  subject  to (i)  laws  of  general
     application  relating to bankruptcy,  insolvency and the relief of debtors,
     and (ii) rules of law governing specific performance, injunctive relief and
     other equitable remedies.

     (c) Except as set forth in Part 2.10 of the Disclosure Schedule:

          (i) Ibex has not violated or breached, or committed any default under,
          any Ibex  Contract,  and, to the best of the knowledge of Ibex and the
          Designated Shareholders,  no other Person has violated or breached, or
          committed any default under, any Ibex Contract;

                                       24
<PAGE>


          (ii)  to  the  best  of the  knowledge  of  Ibex  and  the  Designated
          Shareholders,  no event has occurred, and no circumstance or condition
          exists,  that (with or without notice or lapse of time) will, or could
          reasonably  be expected to, (A) result in a violation or breach of any
          of the provisions of any Ibex Contract,  (B) give any Person the right
          to declare a default or exercise any remedy  under any Ibex  Contract,
          (C)  give  any  Person  the  right  to  accelerate   the  maturity  or
          performance of any Ibex Contract,  or (D) give any Person the right to
          cancel, terminate or modify any Ibex Contract;

          (iii) since  December  31,  1992,  Ibex has not received any notice or
          other  communication  regarding  any actual or possible  violation  or
          breach of, or default under, any Ibex Contract; and

          (iv) Ibex has not waived any of its material rights under any Material
          Contract.

     (d) No Person is renegotiating, or has a right pursuant to the terms of any
     Ibex Contract to renegotiate,  any amount paid or payable to Ibex under any
     Material  Contract or any other  material term or provision of any Material
     Contract.

     (e) The  Contracts  identified  in Part  2.10  of the  Disclosure  Schedule
     collectively  constitute  all of the Contracts  necessary to enable Ibex to
     conduct its business in the manner in which its business is currently being
     conducted.

     (f) Part 2.10 of the  Disclosure  Schedule  identifies and provides a brief
     description of each proposed  Contract as to which any bid,  offer,  award,
     written  proposal,  term sheet or similar  document  has been  submitted or
     received by Ibex since January 1, 1996.

     (g) Part 2.10 of the Disclosure  Schedule provides an accurate  description
     and breakdown of Ibex's backlog under Ibex Contracts.

     (h) Except as set forth in Part 2.10(h) of the  Disclosure  Schedule,  Ibex
     has not entered  into and is not  negotiating  any  Government  Contract or
     Government Bid, and Ibex is not and will not be required to make any filing
     with or give any notice to, or to obtain any Consent from, any Governmental
     Body under or in connection with any Government  Contract or Government Bid
     as a result of or by virtue of (A) the  execution,  delivery of performance
     of  this  Agreement  or any of the  other  agreements  referred  to in this
     Agreement,  or (B)  the  consummation  of the  Merger  or any of the  other
     transactions contemplated by this Agreement.

     2.11 Liabilities.  Ibex has no accrued,  contingent or other liabilities of
any nature, either matured or unmatured (whether or not required to be reflected
in  financial  statements  in  accordance  with  generally  accepted  accounting
principles,  and whether due or to become  due),  except  for:  (a)  liabilities
identified as such in the "liabilities"  column of the Unaudited Interim Balance
Sheet;  (b) accounts payable or accrued salaries that have been incurred by Ibex
since June 30, 1996 in the  ordinary  course of  business  and  consistent  with
Ibex's past practices;  (c) liabilities under Ibex Contracts  identified in Part

                                       25
<PAGE>


2.10 of the Disclosure Schedule,  to the extent the nature and magnitude of such
liabilities  can be  specifically  ascertained  by reference to the text of such
Ibex  Contracts;  and  (d)  the  liabilities  identified  in  Part  2.11  of the
Disclosure Schedule.

     2.12  Compliance with Legal  Requirements.  To the best of the knowledge of
Ibex and the  Designated  Shareholders,  Ibex  is,  and has at all  times  since
December 31, 1992 been, in compliance  with all applicable  Legal  Requirements,
except where the failure to comply with such Legal  Requirements has not had and
will not have a  Material  Adverse  Effect on Ibex.  Except as set forth in Part
2.12 of the Disclosure Schedule,  since December 31, 1992, Ibex has not received
any notice or other  communication  from any  Governmental  Body  regarding  any
actual  or  possible  violation  of,  or  failure  to  comply  with,  any  Legal
Requirement.

     2.13  Governmental  Authorizations.  Part 2.13 of the  Disclosure  Schedule
identifies each material  Governmental  Authorization held by Ibex, and Ibex has
delivered  to  Castelle   accurate  and  complete  copies  of  all  Governmental
Authorizations   identified  in  Part  2.13  of  the  Disclosure  Schedule.  The
Governmental  Authorizations  identified in Part 2.13 of the Disclosure Schedule
are  valid  and in full  force  and  effect,  and  collectively  constitute  all
Governmental  Authorizations necessary to enable Ibex to conduct its business in
the manner in which its business is currently being  conducted.  Ibex is, and at
all times since December 31, 1992 has been, in substantial  compliance  with the
material terms and  requirements of the respective  Governmental  Authorizations
identified in Part 2.13 of the  Disclosure  Schedule.  Since  December 31, 1992,
Ibex has not received any notice or other  communication  from any  Governmental
Body regarding (a) any actual or possible violation of or failure to comply with
any term or requirement of any Governmental Authorization,  or (b) any actual or
possible  revocation,  withdrawal,  suspension,  cancellation,   termination  or
modification of any Governmental Authorization.

     2.14 Tax Matters.

     (a) All Tax  Returns  required to be filed by or on behalf of Ibex with any
     Governmental  Body with respect to any taxable  period  ending on or before
     the Closing Date (the "Ibex  Returns") (i) have been or will be filed on or
     before the applicable due date (including any extensions of such due date),
     and (ii)  have  been,  or will be when  filed,  accurately  and  completely
     prepared in all material  respects in compliance with all applicable  Legal
     Requirements.  All amounts shown on Ibex Returns to be due on or before the
     Closing Date have been or will be paid on or before the Closing Date.  Ibex
     has delivered to Castelle  accurate and complete copies of all Ibex Returns
     filed since December 31, 1992 which have been requested by Castelle.

     (b) Ibex  Financial  Statements  fully  accrue all  actual  and  contingent
     liabilities for Taxes with respect to all periods through the dates thereof
     in accordance  with generally  accepted  accounting  principles.  Ibex will
     establish,  in the ordinary course of business and consistent with its past
     practices,  reserves  adequate  for the payment of all Taxes for the period
     from June 30, 1996  through the Closing  Date,  and Ibex will  disclose the
     dollar amount of such reserves to Castelle on or prior to the Closing Date.

                                       26
<PAGE>


     (c) No Ibex  Return  relating  to income  Taxes has ever been  examined  or
     audited by any Governmental  Body.  Except as set forth in Part 2.14 of the
     Disclosure Schedule,  there have been no examinations or audits of any Ibex
     Return.  Ibex has delivered to Castelle accurate and complete copies of all
     audit reports and similar  documents (to which Ibex has access) relating to
     Ibex Returns.  Except as set forth in Part 2.14 of the Disclosure Schedule,
     no extension or waiver of the limitation  period  applicable to any of Ibex
     Returns  has  been  granted  (by  Ibex or any  other  Person),  and no such
     extension or waiver has been requested from Ibex.

     (d) Except as set forth in Part 2.14 of the Disclosure  Schedule,  no claim
     or Proceeding is pending or has been threatened  against or with respect to
     Ibex in respect of any Tax. There are no unsatisfied  liabilities for Taxes
     (including liabilities for interest, additions to tax and penalties thereon
     and related  expenses)  with respect to any notice of deficiency or similar
     document  received by Ibex with respect to any Tax (other than  liabilities
     for Taxes asserted under any such notice of deficiency or similar  document
     which are being  contested  in good faith by Ibex and with respect to which
     adequate  reserves for payment have been  established).  There are no liens
     for Taxes upon any of the assets of Ibex except liens for current Taxes not
     yet due and  payable.  Ibex has not  entered  into or  become  bound by any
     agreement or consent  pursuant to Section 341(f) of the Code.  Ibex has not
     been,  and Ibex will not be,  required to include any adjustment in taxable
     income for any tax period (or portion  thereof)  pursuant to Section 481 or
     263A of the Code or any  comparable  provision  under  state or foreign Tax
     laws as a result of transactions or events occurring, or accounting methods
     employed, prior to the Closing.

     (e) There is no agreement, plan, arrangement or other Contract covering any
     employee  or  independent  contractor  or former  employee  or  independent
     contractor of Ibex that, considered individually or considered collectively
     with any other such  Contracts,  will, or could  reasonably be expected to,
     give rise  directly or  indirectly  to the payment of any amount that would
     not be deductible pursuant to Section 280G or Section 162 of the Code. Ibex
     is not,  and has  never  been,  a party to or  bound  by any tax  indemnity
     agreement,  tax sharing  agreement,  tax  allocation  agreement  or similar
     Contract.

     2.15 Employee and Labor Matters; Benefit Plans.

     (a) Part 2.15(a) of the Disclosure Schedule identifies each salary,  bonus,
     deferred  compensation,   incentive  compensation,  stock  purchase,  stock
     option, severance pay, termination pay,  hospitalization,  medical, life or
     other  insurance,   supplemental  unemployment  benefits,   profit-sharing,
     pension  or  retirement  plan,  program  or  agreement  (collectively,  the
     "Plans")   sponsored,   maintained,   contributed  to  or  required  to  be
     contributed   to  by  Ibex  for  the  benefit  of  any   employee  of  Ibex
     ("Employee"),  except  for  Plans  which  would  not  require  Ibex to make
     payments  or  provide  benefits  having a value in excess of $10,000 in the
     aggregate.

     (b) Except as set forth in Part 2.15(a) of the  Disclosure  Schedule,  Ibex
     does not  maintain,  sponsor  or  contribute  to,  and,  to the best of the
     knowledge of Ibex and the Designated  Shareholders,  has not at any time in

                                       27
<PAGE>

     the past  maintained,  sponsored or  contributed  to, any employee  pension
     benefit plan (as defined in Section 3(2) of the Employee  Retirement Income
     Security Act of 1974,  as amended  ("ERISA"),  whether or not excluded from
     coverage  under  specific  Titles or  Merger  Subtitles  of ERISA)  for the
     benefit of Employees or former Employees (a "Pension Plan").

     (c) Ibex maintains,  sponsors or contributes only to those employee welfare
     benefit plans (as defined in Section 3(1) of ERISA, whether or not excluded
     from coverage under specific  Titles or Merger  Subtitles of ERISA) for the
     benefit  of  Employees  or former  Employees  which are  described  in Part
     2.15(c) of the Disclosure Schedule (the "Welfare Plans"),  none of which is
     a multiemployer plan (within the meaning of Section 3(37) of ERISA).

     (d) With respect to each Plan, Ibex has delivered to Castelle:

          (i) an  accurate  and  complete  copy  of  such  Plan  (including  all
          amendments thereto);

          (ii) an accurate and complete copy of the annual  report,  if required
          under ERISA, with respect to such Plan for the last two years;

          (iii) an accurate  and complete  copy of the most recent  summary plan
          description,  together with each Summary of Material Modifications, if
          required  under  ERISA,  with  respect to such Plan,  and all material
          employee communications relating to such Plan;

          (iv) if such Plan is funded through a trust or any third party funding
          vehicle,  an accurate and complete  copy of the trust or other funding
          agreement (including all amendments thereto) and accurate and complete
          copies the most recent financial statements thereof;

          (v)  accurate and complete  copies of all  Contracts  relating to such
          Plan,  including  service provider  agreements,  insurance  contracts,
          minimum premium contracts, stop-loss agreements, investment management
          agreements,    subscription   and    participation    agreements   and
          recordkeeping agreements; and

          (vi) an accurate  and complete  copy of the most recent  determination
          letter received from the Internal Revenue Service with respect to such
          Plan (if such Plan is intended to be qualified under Section 401(a) of
          the Code).

     (e) Ibex is not  required to be, and, to the best of the  knowledge of Ibex
     and the Designated Shareholders,  has never been required to be, treated as
     a single  employer with any other Person under Section  4001(b)(1) of ERISA
     or  Section  414(b),  (c),  (m) or (o) of the Code.  Ibex has never  been a
     member of an  "affiliated  service  group"  within  the  meaning of Section
     414(m) of the Code. To the best of the knowledge of Ibex and the Designated
     Shareholders,  Ibex has never made a complete or partial  withdrawal from a
     multiemployer  plan,  as such term is defined  in  Section  3(37) of ERISA,

                                       28
<PAGE>

     resulting  in  "withdrawal  liability,"  as such term is defined in Section
     4201 of ERISA  (without  regard to  subsequent  reduction or waiver of such
     liability under either Section 4207 or 4208 of ERISA).

     (f) Ibex  does not have any plan or  commitment  to create  any  additional
     Welfare  Plan or any  Pension  Plan,  or to modify or change  any  existing
     Welfare Plan or Pension Plan (other than to comply with  applicable law) in
     a manner that would affect any Employee.

     (g) Except as set forth in Part  2.15(g)  of the  Disclosure  Schedule,  no
     Welfare Plan provides  death,  medical or health  benefits  (whether or not
     insured)  with  respect to any  current or former  Employee  after any such
     Employee's termination of service (other than (i) benefit coverage mandated
     by applicable law, including coverage provided pursuant to Section 4980B of
     the Code, (ii) deferred compensation benefits accrued as liabilities on the
     Unaudited  Interim Balance Sheet, and (iii) benefits the full cost of which
     are   borne  by   current   or   former   Employees   (or  the   Employees'
     beneficiaries)).

     (h) With respect to each of the Welfare Plans  constituting  a group health
     plan within the meaning of Section  4980B(g)(2) of the Code, the provisions
     of  Section  4980B of the Code  ("COBRA")  have been  complied  with in all
     material respects.

     (i) Each of the Plans has been  operated and  administered  in all material
     respects in accordance with applicable  Legal  Requirements,  including but
     not limited to ERISA and the Code.

     (j) Each of the Plans intended to be qualified  under Section 401(a) of the
     Code has  received a  favorable  determination  from the  Internal  Revenue
     Service,  and neither Ibex nor any of the Designated  Shareholders is aware
     of any reason why any such determination letter should be revoked.

     (k) Except as set forth in Part 2.15(k) of the Disclosure Schedule, neither
     the  execution,   delivery  or  performance  of  this  Agreement,  nor  the
     consummation of the Merger or any of the other transactions contemplated by
     this  Agreement,  will result in any payment  (including any bonus,  golden
     parachute  or  severance  payment)  to any  current or former  Employee  or
     director of Ibex (whether or not under any Plan),  or  materially  increase
     the benefits  payable under any Plan, or result in any  acceleration of the
     time of payment or vesting of any such benefits.

     (l) Part 2.15(l) of the Disclosure Schedule contains a list of all salaried
     employees of Ibex as of the date of this Agreement, and correctly reflects,
     in all material respects, their salaries, any other compensation payable to
     them  (including   compensation   payable   pursuant  to  bonus,   deferred
     compensation  or commission  arrangements),  their dates of employment  and
     their positions.  Ibex is not a party to any collective bargaining contract
     or other Contract with a labor union involving any of its Employees. All of
     Ibex's employees are "at will" employees.

                                       29
<PAGE>


     (m) Part 2.15(m) of the Disclosure Schedule identifies each Employee who is
     not fully  available to perform work because of  disability  or other leave
     and sets forth the basis of such leave and the  anticipated  date of return
     to full service.

     (n) Ibex is in  compliance  in all material  respects  with all  applicable
     Legal  Requirements  and  Contracts  relating  to  employment,   employment
     practices, wages, bonuses and terms and conditions of employment, including
     employee compensation matters.

     (o) Except as set forth in Part 2.15(o) of the  Disclosure  Schedule,  Ibex
     has good labor relations,  and none of the Designated  Shareholders has any
     reason to  believe  that (i) the  consummation  of the Merger or any of the
     other  transactions  contemplated  by this  Agreement  will have a material
     adverse effect on Ibex's labor  relations,  or (ii) any of Ibex's employees
     intends to terminate his or her employment with Ibex.

     2.16 Environmental  Matters. Ibex is in compliance in all material respects
with all applicable Environmental Laws, which compliance includes the possession
by Ibex of all  permits and other  Governmental  Authorizations  required  under
applicable  Environmental  Laws,  and  compliance  with the terms and conditions
thereof.  Ibex has not received any notice or other communication (in writing or
otherwise),  whether  from a  Governmental  Body,  citizens  group,  employee or
otherwise,  that alleges that Ibex is not in compliance  with any  Environmental
Law,  and, to the best of the  knowledge  of Ibex and  Designated  Shareholders,
there are no circumstances  that may prevent or interfere with Ibex's compliance
with any  Environmental  Law in the future. To the best of the knowledge of Ibex
and the  Designated  Shareholders,  no  current or prior  owner of any  property
leased or controlled by Ibex has received any notice or other  communication (in
writing or otherwise),  whether from a Government Body, citizens group, employee
or  otherwise,  that  alleges that such current or prior owner or Ibex is not in
compliance with any Environmental Law. All Governmental Authorizations currently
held by Ibex pursuant to  Environmental  Laws are identified in Part 2.16 of the
Disclosure Schedule. (For purposes of this Section 2.16: (i) "Environmental Law"
means any  federal,  state,  local or  foreign  Legal  Requirement  relating  to
pollution or protection of human health or the  environment  (including  ambient
air, surface water, ground water, land surface or subsurface strata),  including
any law or regulation relating to emissions,  discharges, releases or threatened
releases of Materials of  Environmental  Concern,  or otherwise  relating to the
manufacture,   processing,  distribution,  use,  treatment,  storage,  disposal,
transport or handling of Materials of Environmental Concern; and (ii) "Materials
of Environmental Concern" include chemicals, pollutants,  contaminants,  wastes,
toxic substances,  petroleum and petroleum products and any other substance that
is now  regulated  by any  Environmental  Law or that is  otherwise  a danger to
health, reproduction or the environment.)

     2.17  Insurance.  Part  2.17  of the  Disclosure  Schedule  identifies  all
insurance  policies  maintained by, at the expense of or for the benefit of Ibex
and identifies any material  claims made  thereunder,  and Ibex has delivered to
Castelle  accurate and complete copies of the insurance  policies  identified on
Part 2.17 of the Disclosure Schedule.  Each of the insurance policies identified
in Part 2.17 of the  Disclosure  Schedule  is in full  force and  effect.  Since

                                       30
<PAGE>


December  31,  1992,  Ibex has not  received  any notice or other  communication
regarding  any  actual or  possible  (a)  cancellation  or  invalidation  of any
insurance  policy,  (b) refusal of any  coverage or rejection of any claim under
any insurance policy,  or (c) material  adjustment in the amount of the premiums
payable with respect to any insurance policy.

     2.18 Related  Party  Transactions.  Except as set forth in Part 2.18 of the
Disclosure  Schedule:  (a) no Related Party has, and no Related Party has at any
time since  December  31,  1992 had,  any  direct or  indirect  interest  in any
material  asset used in or otherwise  relating to the  business of Ibex;  (b) no
Related Party is, or has at any time since  December 31, 1992 been,  indebted to
Ibex; (c) since December 31, 1992, no Related Party has entered into, or has had
any direct or indirect financial interest in, any material Contract, transaction
or business dealing involving Ibex; (d) no Related Party is competing, or has at
any time since  December 31, 1992 competed,  directly or indirectly,  with Ibex;
and (e) no Related  Party has any claim or right against Ibex (other than rights
under company Options and rights to receive  compensation for services performed
as an employee of Ibex). (For purposes of the Section 2.18 each of the following
shall  be  deemed  to  be  a  "Related  Party":   (i)  each  of  the  Designated
Shareholders; (ii) each individual who is, or who has at any time since December
31, 1992 been, an officer of Ibex;  (iii) each member of the immediate family of
each of the individuals  referred to in clauses "(i)" and "(ii)" above; and (iv)
any trust or other Entity (other than Ibex) in which any one of the  individuals
referred to in clauses  "(i)",  "(ii)" and "(iii)" above holds (or in which more
than one of such individuals  collectively hold),  beneficially or otherwise,  a
material voting, proprietary or equity interest.)

     2.19 Legal Proceedings; Orders.

     (a) Except as set forth in Part 2.19 of the Disclosure  Schedule,  there is
     no pending Legal Proceeding,  and (to the best of the knowledge of Ibex and
     the Designated Shareholders) no Person has threatened to commence any Legal
     Proceeding:  (i) that  involves  Ibex or any of the assets owned or used by
     Ibex or any  Person  whose  liability  Ibex  has or may  have  retained  or
     assumed,  either  contractually  or by  operation  of  law;  or  (ii)  that
     challenges,  or that may have the effect of  preventing,  delaying,  making
     illegal  or  otherwise  interfering  with,  the  Merger or any of the other
     transactions  contemplated by this Agreement.  To the best of the knowledge
     of Ibex and the Designated  Shareholders,  except as set forth in Part 2.19
     of the Disclosure Schedule, no event has occurred, and no claim, dispute or
     other condition or circumstance exists, that will, or that could reasonably
     be expected  to, give rise to or serve as a basis for the  commencement  of
     any such Legal Proceeding.

     (b) Except as set forth in Part 2.19 of the Disclosure  Schedule,  no Legal
     Proceeding  has ever been  commenced  by or has ever been  pending  against
     Ibex.

     (c) There is no order, writ, injunction,  judgment or decree to which Ibex,
     or any of the  assets  owned  or  used by  Ibex,  is  subject.  None of the
     Designated Shareholders is subject to any order, writ, injunction, judgment
     or decree that relates to Ibex's  business or to any of the assets owned or
     used by Ibex.  To the  best of the  knowledge  of Ibex  and the  Designated
     Shareholders, no officer or other employee of Ibex is subject to any order,

                                       31
<PAGE>

     writ,  injunction,  judgment or decree that prohibits such officer or other
     employee from engaging in or continuing  any conduct,  activity or practice
     relating to Ibex's business.

     2.20 Authority;  Binding Nature of Agreement. Ibex has the right, power and
authority to enter into and to perform its obligations under this Agreement; and
the execution, delivery and performance by Ibex of this Agreement have been duly
authorized  by all  necessary  action  on the  part of Ibex  and  its  board  of
directors. This Agreement constitutes the legal, valid and binding obligation of
Ibex, enforceable against Ibex in accordance with its terms, subject to (i) laws
of general  application  relating to  bankruptcy,  insolvency  and the relief of
debtors, and (ii) rules of law governing specific performance, injunctive relief
and other equitable remedies.

     2.21 Non-Contravention;  Consents.  Except as set forth in Part 2.21 of the
Disclosure Schedule, neither (1) the execution,  delivery or performance of this
Agreement or any of the other agreements referred to in this Agreement,  nor (2)
the consummation of the Merger or any of the other transactions  contemplated by
this Agreement,  will directly or indirectly (with or without notice or lapse of
time):

     (a)  contravene,  conflict  with or result in a violation of (i) any of the
     provisions  of Ibex's  articles  of  incorporation  or bylaws,  or (ii) any
     resolution adopted by Ibex's shareholders, Ibex's board of directors or any
     committee of Ibex's board of directors;

     (b)  contravene,  conflict  with or result in a  violation  of, or give any
     Governmental  Body or  other  Person  the  right  to  challenge  any of the
     transactions  contemplated  by this  Agreement or to exercise any remedy or
     obtain  any  relief  under,  any  Legal  Requirement  or any  order,  writ,
     injunction, judgment or decree to which Ibex, or any of the assets owned or
     used by Ibex, is subject;

     (c) contravene,  conflict with or result in a violation of any of the terms
     or  requirements  of, or give any  Governmental  Body the right to  revoke,
     withdraw,   suspend,   cancel,   terminate  or  modify,   any  Governmental
     Authorization  that is held by Ibex or that  otherwise  relates  to  Ibex's
     business or to any of the assets owned or used by Ibex;

     (d)  contravene,  conflict  with or result in a violation  or breach of, or
     result in a material default under, any provision of any Ibex Contract that
     is or would constitute a Material Contract, or give any Person the right to
     (i) declare a default or exercise any remedy under any such Ibex  Contract,
     (ii)  accelerate the maturity or performance of any such Ibex Contract,  or
     (iii) cancel, terminate or modify any such Ibex Contract; or

     (e) result in the  imposition or creation of any lien or other  Encumbrance
     upon or with  respect to any asset owned or used by Ibex  (except for minor
     liens that will not, in any case or in the  aggregate,  materially  detract
     from the value of the  assets  subject  thereto  or  materially  impair the
     operations of Ibex).

                                       32
<PAGE>


Except  as set forth in Part 2.21 of the  Disclosure  Schedule,  Ibex is not and
will not be required to make any filing with or give any notice to, or to obtain
any Consent from, any Person in connection  with (x) the execution,  delivery or
performance of this Agreement or any of the other agreements referred to in this
Agreement,  or  (y)  the  consummation  of  the  Merger  or  any  of  the  other
transactions contemplated by this Agreement.

     2.22 Full Disclosure.

     (a) This Agreement  (including  the Disclosure  Schedule) does not, and the
     Designated  Shareholders'  Closing  Certificate  will not,  (i) contain any
     representation,  warranty or information  that is false or misleading  with
     respect  to any  material  fact,  or (ii) omit to state any  material  fact
     necessary in order to make the representations,  warranties and information
     contained  and to be  contained  herein  and  therein  (in the light of the
     circumstances under which such representations,  warranties and information
     were or will be made or provided) not false or misleading.

     (b) Should Castelle elect to file a permit  application under Section 25121
     of the California Corporations Code, including an Information Statement (as
     defined in Section 5.2), the information  supplied by Ibex for inclusion in
     the  Information  Statement  will  not,  as of the date of the  Information
     Statement or as of the date of the Ibex  Shareholders'  Meeting (as defined
     in Section 5.3), (i) contain any statement that is inaccurate or misleading
     with respect to any material  fact, or (ii) omit to state any material fact
     necessary  in  order  to  make  such  information  (in  the  light  of  the
     circumstances under which it is provided) not false or misleading.

     (c) Should  Castelle elect to prepare and file a registration  statement on
     Form  S-4 to be filed  with  the SEC by  Castelle  in  connection  with the
     issuance of the Castelle Common Stock in the Merger (the "S-4  Registration
     Statement"), none of the information supplied or to be supplied by Ibex for
     inclusion or incorporation  by reference in the S-4 Registration  Statement
     will, at the time the S-4  Registration  Statement is filed with the SEC or
     at the time the S-4  Registration  Statement  becomes  effective  under the
     Securities Act,  contain any untrue statement of a material fact or omit to
     state any material fact required to be stated therein or necessary in order
     to make the statements  therein,  in light of the circumstances under which
     they are made, not misleading.  None of the  information  supplied or to be
     supplied  by Ibex  for  inclusion  or  incorporation  by  reference  in the
     Prospectus/Proxy  Statement  filed  as  a  part  of  the  S-4  Registration
     Statement (the "Prospectus/Proxy  Statement"),  will, at the time mailed to
     the  shareholders  of  Castelle  and Ibex,  and as of the  Effective  Time,
     contain  any  untrue  statement  of a  material  fact or omit to state  any
     material fact  required to be stated  therein or necessary in order to make
     the statements  therein, in light of the circumstances under which they are
     made, not misleading.

SECTION 3. REPRESENTATIONS AND WARRANTIES OF CASTELLE

     Castelle represents and warrants to Ibex and the Designated Shareholders as
follows:

                                       33
<PAGE>

     3.1 Due Organization; No Subsidiaries; Etc.

     (a) Castelle is a corporation duly organized,  validly existing and in good
     standing  under the laws of the State of  California  and has all necessary
     power and authority: (i) to conduct its business in the manner in which its
     business is currently  being  conducted;  (ii) to own and use its assets in
     the manner in which its assets are currently  owned and used;  and (iii) to
     perform its obligations under all Castelle Contracts.

     (b) Except as set forth in Part 3.1 of the  Castelle  Disclosure  Schedule,
     Castelle has not conducted any business  under or otherwise  used,  for any
     purpose or in any  jurisdiction,  any fictitious name,  assumed name, trade
     name or other name, other than the name "Castelle."

     (c) Castelle is not and has not been required to be qualified,  authorized,
     registered  or  licensed to do  business  as a foreign  corporation  in any
     jurisdiction where the failure to be so qualified,  authorized,  registered
     or  licensed  has not had and will not have a  Material  Adverse  Effect on
     Castelle.

     (d)  Castelle's   Form  10-KSB  filed  with  the  Securities  and  Exchange
     Commission  (the "SEC") on April 1, 1996 and its Form  10-KSB/A  filed with
     the SEC on April  29,  1996  accurately  sets  forth  (i) the  names of the
     members of Castelle's board of directors,  (ii) the names of the members of
     each  committee of Castelle's  board of directors,  and (iii) the names and
     titles of Castelle's officers.

     (e)  Castelle  does not own any  controlling  interest  in any Entity  and,
     except  for the equity  interests  identified  in Part 3.1 of the  Castelle
     Disclosure Schedule,  Castelle has never owned,  beneficially or otherwise,
     any  shares or other  securities  of,  or any  direct  or  indirect  equity
     interest in, any Entity.  Castelle  has not agreed and is not  obligated to
     make any  future  investment  in or  capital  contribution  to any  Entity.
     Castelle  has not  guaranteed  and is not  responsible  or  liable  for any
     obligation  of any of the Entities in which it owns or has owned any equity
     interest.

     3.2 SEC Filings; Financial Statements.

     (a) Castelle has delivered to Ibex accurate and complete copies  (excluding
     copies of exhibits) of each report, registration statement (on a form other
     than Form S-8) and definitive  proxy  statement  filed by Castelle with the
     SEC between November 16, 1995 and the date of this Agreement (the "Castelle
     SEC  Documents").  As of the time it was filed with the SEC (or, if amended
     or superseded by a filing prior to the date of this Agreement,  then on the
     date of such filing):  (i) each of the Castelle SEC  Documents  complied in
     all material  respects with the applicable  requirements  of the Securities
     Act or the Exchange Act (as the case may be); and (ii) none of the Castelle
     SEC Documents  contained any untrue statement of a material fact or omitted
     to state a material  fact  required to be stated  therein or  necessary  in
     order to make the  statements  therein,  in the light of the  circumstances
     under which they were made, not misleading.

                                       34
<PAGE>

     (b) The  consolidated  financial  statements  contained in the Castelle SEC
     Documents:  (i)  complied  as to form in all  material  respects  with  the
     published  rules and regulations of the SEC applicable  thereto;  (ii) were
     prepared  in  accordance  with  generally  accepted  accounting  principles
     applied on a consistent basis throughout the periods covered, except as may
     be indicated in the notes to such financial  statements and (in the case of
     unaudited  statements)  as  permitted by Form 10-QSB of the SEC, and except
     that  unaudited  financial  statements  may not contain  footnotes  and are
     subject  to  year-end  audit  adjustments;  and (iii)  fairly  present  the
     consolidated  financial position of Castelle and its subsidiaries as of the
     respective  dates  thereof and the  consolidated  results of  operations of
     Castelle and its subsidiaries for the periods covered thereby.

     3.3 Capitalization, Etc.

     (a) The authorized  capital stock of Castelle  consists of: (i) twenty-five
     million  (25,000,000)  shares of Common Stock (with no par value), of which
     three  million  six  hundred  twenty  thousand  eight  hundred   forty-four
     (3,620,844)  shares  have been issued and are  outstanding  as of August 7,
     1996; and (ii) two million  (2,000,000)  shares of Preferred Stock (with no
     par  value),  none of which such  shares have been issued as of the date of
     this Agreement. All of the outstanding shares of Castelle Common Stock have
     been  duly  authorized  and  validly   issued,   and  are  fully  paid  and
     non-assessable.

     (b) Castelle has reserved  nine hundred  forty-five  thousand  five hundred
     eighty-three  (945,583)  shares of Castelle Common Stock for issuance under
     its 1988  Incentive  Stock Plan, of which options to purchase three hundred
     sixty thousand four hundred twelve  (360,412)  shares are outstanding as of
     August 13, 1996. In addition,  the Company has reserved one hundred  twenty
     thousand  (120,000)  shares of Common  Stock  for  issuance  under the 1995
     Outside  Directors'  Stock  Option Plan,  of which  options to purchase ten
     thousand  (10,000) shares are outstanding as of the date of this Agreement.
     The Company also has  outstanding  warrants for the purchase of two hundred
     forty-eight  thousand  three  hundred  thirty-two  (248,332)  shares of the
     Company's  Common  Stock.  Except as set forth in Part 3.3 of the  Castelle
     Disclosure  Schedule,  there is no: (i) outstanding  subscription,  option,
     call,  warrant or right (whether or not currently  exercisable)  to acquire
     any shares of the  capital  stock or other  securities  of  Castelle;  (ii)
     outstanding  security,  instrument  or  obligation  that  is or may  become
     convertible  into or  exchangeable  for any shares of the capital  stock or
     other securities of Castelle; (iii) Contract under which Castelle is or may
     become obligated to sell or otherwise issue any shares of its capital stock
     or any other securities;  or (iv) to the best of the knowledge of Castelle,
     condition or circumstance  that may give rise to or provide a basis for the
     assertion  of a claim by any  Person  to the  effect  that  such  Person is
     entitled  to  acquire  or  receive  any  shares of  capital  stock or other
     securities of Castelle.

     (c) All outstanding  shares of Castelle  Common Stock,  and all outstanding
     Castelle  Options,  have been issued and granted in compliance with (i) all
     applicable  securities laws and other  applicable Legal  Requirements,  and
     (ii) all requirements set forth in applicable Contracts.

                                       35
<PAGE>

     3.4 Authority;  Binding Nature of Agreement.  Castelle has the absolute and
unrestricted  right, power and authority to perform their obligations under this
Agreement;  and the  execution,  delivery  and  performance  by Castelle of this
Agreement  (including the contemplated  issuance of Castelle Common Stock in the
Merger in  accordance  with this  Agreement)  have been duly  authorized  by all
necessary action on the part of Castelle and its respective boards of directors.
This Agreement  constitutes the legal, valid and binding obligation of Castelle,
enforceable  against it in  accordance  with its  terms,  subject to (i) laws of
general  application  relating  to  bankruptcy,  insolvency  and the  relief  of
debtors, and (ii) rules of law governing specific performance, injunctive relief
and other  equitable  remedies.  

     3.5  Absence of  Changes.  Except as set forth in Part 3.5 of the  Castelle
Disclosure Schedule, since June 28, 1996:

     (a) there has not been any material adverse change in Castelle's  business,
     condition,  assets,  liabilities,   operations,  financial  performance  or
     prospects,  and, to the best of the  knowledge  of  Castelle,  no event has
     occurred  that will,  or could  reasonably  be expected to, have a Material
     Adverse Effect on Castelle;

     (b) there has not been any material loss,  damage or destruction to, or any
     material  interruption in the use of, any of Castelle's  assets (whether or
     not covered by insurance);

     (c) Castelle has not declared,  accrued,  set aside or paid any dividend or
     made any other  distribution in respect of any shares of capital stock, and
     has not repurchased, redeemed or otherwise reacquired any shares of capital
     stock or other securities;

     (d) Castelle  has not sold,  issued or  authorized  the issuance of (i) any
     capital stock or other  security  (except for Castelle  Common Stock issued
     upon the  exercise of  outstanding  Castelle  Options),  (ii) any option or
     right to  acquire  any  capital  stock or any other  security  (except  for
     Castelle Options identified in Section 3.3 of the Agreement),  or (iii) any
     instrument  convertible into or exchangeable for any capital stock or other
     security;

     (e)  Castelle  has not  amended  or  waived  any of its  rights  under,  or
     permitted the  acceleration of vesting under, (i) any provision of its 1988
     Incentive Stock Plan or 1995 Outside Directors' Stock Option Plan, (ii) any
     provision of any agreement  evidencing any outstanding  Castelle Option, or
     (iii) any restricted stock purchase agreement;

     (f) there has been no amendment to Castelle's  articles of incorporation or
     bylaws,  and Castelle  has not effected or been a party to any  Acquisition
     Transaction,  recapitalization,  reclassification  of shares,  stock split,
     reverse stock split or similar transaction;

     (g) Castelle has not formed any subsidiary or acquired any equity  interest
     or other interest in any other Entity;

                                       36
<PAGE>

     (h) Castelle has not made any capital  expenditure which, when added to all
     other capital  expenditures made on behalf of Castelle since June 30, 1996,
     exceeds $50,000;

     (i) Castelle has not (i) entered into or permitted  any of the assets owned
     or used by it to become bound by any Contract that is or would constitute a
     Material  Contract  (as  defined in Section  2.10(a)),  or (ii)  amended or
     prematurely  terminated,  or waived any material right or remedy under, any
     such Contract;

     (j)  Castelle has not (i)  acquired,  leased or licensed any right or other
     asset from any other Person,  (ii) sold or otherwise disposed of, or leased
     or licensed,  any right or other asset to any other Person, or (iii) waived
     or relinquished any right, except for immaterial rights or other immaterial
     assets acquired,  leased, licensed or disposed of in the ordinary course of
     business and consistent with Castelle's past practices;

     (k)  Castelle  has not written off as  uncollectible,  or  established  any
     extraordinary  reserve  with  respect to, any account  receivable  or other
     indebtedness;

     (l)  Castelle  has not made any  pledge of any of its  assets or  otherwise
     permitted any of its assets to become  subject to any  Encumbrance,  except
     for pledges of  immaterial  assets made in the ordinary  course of business
     and consistent with Castelle's past practices;

     (m) Castelle has not (i) lent money to any Person  (other than  pursuant to
     routine  travel  advances  made to  employees  in the  ordinary  course  of
     business),  or (ii) incurred or guaranteed  any  indebtedness  for borrowed
     money;

     (n) Castelle has not (i) established or adopted any Employee  Benefit Plan,
     (ii) paid any bonus or made any  profit-sharing  or similar  payment to, or
     increased the amount of the wages, salary, commissions,  fringe benefits or
     other  compensation  or  remuneration  payable  to,  any of its  directors,
     officers or employees, or (iii) hired any new employee;

     (o) Castelle has not changed any of its methods of accounting or accounting
     practices in any respect;

     (p) Castelle has not made any Tax election;

     (q) Castelle has not commenced or settled any Legal Proceeding;

     (r) Castelle has not entered  into any  material  transaction  or taken any
     other  material   action  outside  the  ordinary   course  of  business  or
     inconsistent with its past practices; and

     (s)  Castelle  has not  agreed  or  committed  to take  any of the  actions
     referred to in clauses "(c)" through "(r)" above.

                                       37
<PAGE>

     3.6 Title to Assets.  Castelle  owns,  and has good,  valid and  marketable
title to,  all assets  purported  to be owned by it,  including:  (i) all assets
reflected in the financial  statements  included in the Castelle SEC  Documents;
(ii) all assets  referred to in Sections 3.1 and 3.7 of the Castelle  Disclosure
Schedule;  and (iii) all other assets  reflected in Castelle's books and records
as being  owned by  Castelle.  Except as set  forth in Part 3.6 of the  Castelle
Disclosure Schedule,  all of said assets are owned by Castelle free and clear of
any liens or other  Encumbrances,  except for (x) any lien for current taxes not
yet due and payable, and (y) minor liens that have arisen in the ordinary course
of business and that do not (in any case or in the aggregate) materially detract
from the value of the assets subject thereto or materially impair the operations
of Castelle.

     3.7 Proprietary Assets.

     (a) Except as set forth in Part 3.7(a) of the Castelle Disclosure Schedule,
     Castelle  has  good,   valid  and  marketable  title  to  all  of  Castelle
     Proprietary Assets, free and clear of all liens and other Encumbrances, and
     has a valid right to use all such Proprietary  Assets.  Except as set forth
     in  Part  3.7(a)  of the  Castelle  Disclosure  Schedule,  Castelle  is not
     obligated  to make any  payment to any  Person for the use of any  Castelle
     Proprietary  Asset.  Except  as set forth in Part  3.7(a)  of the  Castelle
     Disclosure  Schedule,  Castelle  has not  developed  jointly with any other
     Person any  Castelle  Proprietary  Asset  with  respect to which such other
     Person has any rights.

     (b) Castelle has taken all reasonable measures and precautions necessary to
     protect  and  maintain  the  confidentiality  and  secrecy of all  Castelle
     Proprietary Assets (except Castelle Proprietary Assets whose value would be
     unimpaired by public  disclosure) and otherwise to maintain and protect the
     value of all  Castelle  Proprietary  Assets.  Except  as set  forth in Part
     3.7(b) of the Castelle Disclosure Schedule, to the best of the knowledge of
     Castelle  after  due  inquiry  of its  officers,  directors  and  advisors,
     Castelle has not (other than pursuant to license  agreements)  disclosed or
     delivered to any Person,  or permitted  the  disclosure  or delivery to any
     Person  of,  (i) the source  code,  or any  portion or aspect of the source
     code, of any Castelle  Proprietary  Asset,  or (ii) the object code, or any
     portion or aspect of the object code, of any Castelle Proprietary Asset.

     (c) To the best of the  knowledge  of  Castelle  after due  inquiry  of its
     officers,  directors and advisors,  none of the Castelle Proprietary Assets
     infringes  or  conflicts  with any  Proprietary  Asset owned or used by any
     other Person. To the best of the knowledge of Castelle after due inquiry of
     its  officers,   directors  and  advisors,   Castelle  is  not  infringing,
     misappropriating or making any unlawful use of, and Castelle has not at any
     time  infringed,  misappropriated  or made any unlawful use of, or received
     any notice or other  communication (in writing or otherwise) of any actual,
     alleged,  possible or potential infringement,  misappropriation or unlawful
     use of, any  Proprietary  Asset owned or used by any other  Person.  To the
     best  of  the  knowledge  of  Castelle,  no  other  Person  is  infringing,
     misappropriating  or making any unlawful use of, and no  Proprietary  Asset
     owned or used by any other Person infringes or conflicts with, any Castelle
     Proprietary Asset.

                                       38
<PAGE>

     (d) Except as set forth in Part 3.7(d) of the Castelle Disclosure Schedule:
     (i) each Castelle  Proprietary Asset conforms in all material respects with
     any specification,  documentation,  performance standard, representation or
     statement  made  or  provided  with  respect  thereto  by or on  behalf  of
     Castelle;  and (ii) there has not been any claim by any  customer  or other
     Person alleging that any Castelle Proprietary Asset (including each version
     thereof that has ever been licensed or otherwise made available by Castelle
     to  any  Person)  does  not  conform  in all  material  respects  with  any
     specification,   documentation,  performance  standard,  representation  or
     statement made or provided by or on behalf of Castelle, and, to the best of
     the knowledge of Castelle,  there is no basis for any such claim.  Castelle
     has established adequate reserves on its consolidated  financial statements
     contained in the Castelle SEC Documents to cover all costs  associated with
     any  obligations  that Castelle may have with respect to the  correction or
     repair of  programming  errors or other  defects  in  Castelle  Proprietary
     Assets.

     (e) Castelle  Proprietary  Assets  constitute  all the  Proprietary  Assets
     necessary to enable Castelle to conduct its business in the manner in which
     such business has been and is being conducted.  Except as set forth in Part
     3.7(e) of the Castelle Disclosure  Schedule,  (i) Castelle has not licensed
     any of Castelle Proprietary Assets to any Person on an exclusive basis, and
     (ii)  Castelle has not entered into any covenant not to compete or Contract
     limiting its ability to exploit fully any of its  Proprietary  Assets or to
     transact business in any market or geographical area or with any Person.

     (f) Except as set forth in Part 3.7(f) of the Castelle Disclosure Schedule,
     (i) all  current  and  former  employees  of  Castelle  have  executed  and
     delivered  to  Castelle  an  agreement  (containing  no  exceptions  to  or
     exclusions from the scope of its coverage) that is substantially  identical
     to the form of Castelle Employee  Agreement  Concerning  Inventions,  Trade
     Secrets and Confidential Information previously delivered to Ibex, and (ii)
     all current and former consultants and independent  contractors to Castelle
     have  executed  and  delivered  to Castelle  an  agreement  (containing  no
     exceptions  to or  exclusions  from  the  scope  of its  coverage)  that is
     substantially identical to the form of Consultant Confidential  Information
     and Invention Assignment Agreements previously delivered to Ibex.

     3.8 Liabilities.  Castelle has no accrued,  contingent or other liabilities
of any  nature,  either  matured or  unmatured  (whether  or not  required to be
reflected  in  financial   statements  in  accordance  with  generally  accepted
accounting  principles,  and whether  due or to become  due),  except  for:  (a)
liabilities  identified as such in the "liabilities"  column of the consolidated
financial  statements  contained  in the Castelle  SEC  Documents;  (b) accounts
payable or accrued  salaries that have been incurred by Castelle  since June 30,
1996 in the ordinary  course of business and  consistent  with  Castelle's  past
practices;  and (c) the  liabilities  identified  in  Part  3.8 of the  Castelle
Disclosure Schedule.

     3.9  Compliance  with  Legal  Requirements.   To  the  best  of  Castelle's
knowledge,  Castelle is, and has at all times since  December 31, 1992 been,  in
compliance with all applicable Legal  Requirements,  except where the failure to
comply  with such  Legal  Requirements  has not had and will not have a Material
Adverse  Effect on  Castelle.  Except  as set forth in Part 3.9 of the  Castelle
Disclosure  Schedule,  since  December 31,  1992,  Castelle has not received any

                                       39
<PAGE>

notice or other communication from any Governmental Body regarding any actual or
possible violation of, or failure to comply with, any Legal Requirement.

     3.10   Governmental   Authorizations.   Castelle  holds  all   Governmental
Authorizations  necessary  to enable  Castelle  to conduct  its  business in the
manner in which its business is currently being  conducted.  Castelle is, and at
all times since December 31, 1992 has been, in substantial  compliance  with the
material terms and  requirements of the respective  Governmental  Authorizations
necessary for its business.  Since December 31, 1992,  Castelle has not received
any notice or other  communication  from any Governmental Body regarding (a) any
actual  or  possible  violation  of or  failure  to  comply  with  any  term  or
requirement of any Governmental Authorization necessary for its business, or (b)
any  actual  or  possible  revocation,  withdrawal,  suspension,   cancellation,
termination or modification of any Governmental  Authorization necessary for its
business.

     3.11 Tax Matters.

     (a) All Tax Returns  required to be filed by or on behalf of Castelle  with
     any  Governmental  Body with  respect to any  taxable  period  ending on or
     before the Closing Date (the  "Castelle  Returns") (i) have been or will be
     filed on or before the  applicable  due date  (including  any extensions of
     such due date),  and (ii) have been, or will be when filed,  accurately and
     completely  prepared  in all  material  respects  in  compliance  with  all
     applicable Legal Requirements.  All amounts shown on Castelle Returns to be
     due on or before  the  Closing  Date have been or will be paid on or before
     the Closing Date.

     (b) Castelle  Financial  Statements  fully accrue all actual and contingent
     liabilities for Taxes with respect to all periods through the dates thereof
     in accordance with generally accepted accounting principles.  Castelle will
     establish,  in the ordinary course of business and consistent with its past
     practices,  reserves  adequate  for the payment of all Taxes for the period
     from June 30, 1996 through the Closing Date.

     (c) No Castelle  Return  relating to income Taxes has ever been examined or
     audited by any Governmental  Body.  Except as set forth in Part 3.11 of the
     Castelle Disclosure Schedule,  there have been no examinations or audits of
     any Castelle Return.

     (d) Except as set forth in Part 3.11 of the Castelle  Disclosure  Schedule,
     no claim or  Proceeding is pending or has been  threatened  against or with
     respect  to  Castelle  in  respect  of any Tax.  There  are no  unsatisfied
     liabilities for Taxes (including liabilities for interest, additions to tax
     and penalties  thereon and related  expenses) with respect to any notice of
     deficiency or similar document received by Castelle with respect to any Tax
     (other  than  liabilities  for  Taxes  asserted  under  any such  notice of
     deficiency or similar  document which are being  contested in good faith by
     Castelle and with respect to which adequate  reserves for payment have been
     established).  There  are no liens  for  Taxes  upon any of the  assets  of
     Castelle  except liens for current Taxes not yet due and payable.  Castelle
     has not entered into or become bound by any  agreement or consent  pursuant
     to Section 341(f) of the Code. Castelle has not been, and Castelle will not

                                       40
<PAGE>

     be, required to include any adjustment in taxable income for any tax period
     (or  portion  thereof)  pursuant  to Section 481 or 263A of the Code or any
     comparable  provision  under  state or  foreign  Tax  laws as a  result  of
     transactions or events occurring, or accounting methods employed,  prior to
     the Closing.

     (e) There is no agreement, plan, arrangement or other Contract covering any
     employee  or  independent  contractor  or former  employee  or  independent
     contractor  of  Castelle  that,   considered   individually  or  considered
     collectively  with any other such Contracts,  will, or could  reasonably be
     expected to, give rise  directly or indirectly to the payment of any amount
     that would not be deductible pursuant to Section 280G or Section 162 of the
     Code.  Castelle is not,  and has never been, a party to or bound by any tax
     indemnity  agreement,  tax sharing agreement,  tax allocation  agreement or
     similar Contract.

     3.12 Employee and Labor Matters;  Benefit Plans.  Each of Castelle's  Plans
has been operated and  administered in all material  respects in accordance with
applicable Legal Requirements, including but not limited to ERISA and the Code.

     3.13  Environmental  Matters.  Castelle is in  compliance  in all  material
respects with all applicable  Environmental  Laws, which compliance includes the
possession  by Castelle of all  permits  and other  Governmental  Authorizations
required under applicable  Environmental Laws, and compliance with the terms and
conditions thereof.  Castelle has not received any notice or other communication
(in writing or otherwise),  whether from a Governmental  Body,  citizens  group,
employee or otherwise,  that alleges that Castelle is not in compliance with any
Environmental  Law, and, to the best of the knowledge of Castelle,  there are no
circumstances that may prevent or interfere with Castelle's  compliance with any
Environmental  Law in the future.  To the best of the knowledge of Castelle,  no
current or prior owner of any  property  leased or  controlled  by Castelle  has
received any notice or other  communication  (in writing or otherwise),  whether
from a Government Body, citizens group, employee or otherwise, that alleges that
such  current  or  prior  owner  or  Castelle  is not  in  compliance  with  any
Environmental Law. (For purposes of this Section 3.13: (i)  "Environmental  Law"
means any  federal,  state,  local or  foreign  Legal  Requirement  relating  to
pollution or protection of human health or the  environment  (including  ambient
air, surface water, ground water, land surface or subsurface strata),  including
any law or regulation relating to emissions,  discharges, releases or threatened
releases of Materials of  Environmental  Concern,  or otherwise  relating to the
manufacture,   processing,  distribution,  use,  treatment,  storage,  disposal,
transport or handling of Materials of Environmental Concern; and (ii) "Materials
of Environmental Concern" include chemicals, pollutants,  contaminants,  wastes,
toxic substances,  petroleum and petroleum products and any other substance that
is now  regulated  by any  Environmental  Law or that is  otherwise  a danger to
health, reproduction or the environment.)

     3.14 Legal Proceedings; Orders.

     (a) Except as set forth in Part 3.14 of the Castelle  Disclosure  Schedule,
     there is no pending Legal Proceeding,  and (to the best of the knowledge of
     Castelle) no Person has  threatened to commence any Legal  Proceeding:  (i)
     that  involves  Castelle or any of the assets  owned or used by Castelle or

                                       41
<PAGE>

     any Person whose  liability  Castelle has or may have  retained or assumed,
     either  contractually or by operation of law; or (ii) that  challenges,  or
     that may  have the  effect  of  preventing,  delaying,  making  illegal  or
     otherwise  interfering  with,  the Merger or any of the other  transactions
     contemplated by this  Agreement.  To the best of the knowledge of Castelle,
     except as set forth in Part 3.14 of the Castelle  Disclosure  Schedule,  no
     event  has  occurred,   and  no  claim,   dispute  or  other  condition  or
     circumstance  exists,  that will, or that could  reasonably be expected to,
     give rise to or serve as a basis  for the  commencement  of any such  Legal
     Proceeding.

     (b)  There is no  order,  writ,  injunction,  judgment  or  decree to which
     Castelle,  or any of the assets owned or used by Castelle,  is subject.  To
     the best of the  knowledge  of  Castelle,  no officer or other  employee of
     Castelle is subject to any order, writ, injunction, judgment or decree that
     prohibits such officer or other employee from engaging in or continuing any
     conduct, activity or practice relating to Castelle's business.

     3.15 Non-Contravention;  Consents.  Except as set forth in Part 3.15 of the
Castelle Disclosure Schedule, neither (1) the execution, delivery or performance
of this Agreement or any of the other agreements  referred to in this Agreement,
nor  (2)  the  consummation  of the  Merger  or any  of the  other  transactions
contemplated  by this  Agreement,  will directly or indirectly  (with or without
notice or lapse of time):

     (a)  contravene,  conflict  with or result in a violation of (i) any of the
     provisions of Castelle's  articles of incorporation or bylaws,  or (ii) any
     resolution  adopted  by  Castelle's   shareholders,   Castelle's  board  of
     directors or any committee of Castelle's board of directors;

     (b)  contravene,  conflict  with or result in a  violation  of, or give any
     Governmental  Body or  other  Person  the  right  to  challenge  any of the
     transactions  contemplated  by this  Agreement or to exercise any remedy or
     obtain  any  relief  under,  any  Legal  Requirement  or any  order,  writ,
     injunction,  judgment  or decree to which  Castelle,  or any of the  assets
     owned or used by Castelle, is subject;

     (c) contravene,  conflict with or result in a violation of any of the terms
     or  requirements  of, or give any  Governmental  Body the right to  revoke,
     withdraw,   suspend,   cancel,   terminate  or  modify,   any  Governmental
     Authorization  that is held  by  Castelle  or  that  otherwise  relates  to
     Castelle's business or to any of the assets owned or used by Castelle;

     (d)  contravene,  conflict  with or result in a violation  or breach of, or
     result in a material default under, any provision of any Castelle  Contract
     that is or would  constitute  a Material  Contract,  or give any Person the
     right to (i)  declare a  default  or  exercise  any  remedy  under any such
     Castelle Contract,  (ii) accelerate the maturity or performance of any such
     Castelle Contract,  or (iii) cancel,  terminate or modify any such Castelle
     Contract; or

     (e) result in the  imposition or creation of any lien or other  Encumbrance
     upon or with  respect to any asset  owned or used by  Castelle  (except for
     minor  liens  that will not,  in any case or in the  aggregate,  materially
     detract from the value of the assets subject  thereto or materially  impair
     the operations of Castelle).

                                       42
<PAGE>

Except as set forth in Part 3.15 of the Castelle  Disclosure  Schedule or as may
be required by the Exchange Act,  Securities  Act, state  securities or blue sky
laws,  the CGCL and the NASD  Bylaws  (as they  relate  to the S-4  Registration
Statement and the  Prospectus/Proxy  Statement,  or the Information  Statement),
Castelle  is not and will not be  required  to make any filing  with or give any
notice to, or to obtain any Consent from, any Person in connection  with (x) the
execution,  delivery  or  performance  of  this  Agreement  or any of the  other
agreements referred to in this Agreement,  or (y) the consummation of the Merger
or any of the other transactions contemplated by this Agreement.

     3.16 Full Disclosure.

     (a) This Agreement  (including the Castelle  Disclosure  Schedule) does not
     (i) contain any  representation,  warranty or information  that is false or
     misleading  with  respect to any material  fact,  or (ii) omit to state any
     material fact  necessary in order to make the  representations,  warranties
     and  information  contained and to be contained  herein and therein (in the
     light of the circumstances under which such representations, warranties and
     information were or will be made or provided) not false or misleading.

     (b) Should Castelle elect to file a permit  application under Section 25121
     of the California Corporations Code, including an Information Statement (as
     defined in Section 5.2), the information supplied by Castelle for inclusion
     in the  Information  Statement  (as defined in Section 5.2) will not, as of
     the  date  of  the  Information  Statement  or  as  of  the  date  of  Ibex
     Shareholders'  Meeting  (as  defined  in  Section  5.3),  (i)  contain  any
     statement  that is inaccurate  or  misleading  with respect to any material
     fact,  or (ii) omit to state any material  fact  necessary in order to make
     such  information  (in the  light of the  circumstances  under  which it is
     provided) not false or misleading.

     (c)  Should  Castelle  elect  to  prepare  and  file  an  S-4  Registration
     Statement,  none of the information  supplied or to be supplied by Castelle
     for  inclusion  or  incorporation  by  reference  in the  S-4  Registration
     Statement  will, at the time the S-4  Registration  Statement is filed with
     the SEC or at the time the S-4  Registration  Statement  becomes  effective
     under the Securities Act,  contain any untrue  statement of a material fact
     or omit to state  any  material  fact  required  to be  stated  therein  or
     necessary  in  order  to make  the  statements  therein,  in  light  of the
     circumstances  under  which  they are  made,  not  misleading.  None of the
     information  supplied  or to be  supplied  by  Castelle  for  inclusion  or
     incorporation by reference in the  Prospectus/Proxy  Statement will, at the
     dates  mailed to the  shareholders  of  Castelle  and  Ibex,  and as of the
     Effective Time,  contain any untrue statement of a material fact or omit to
     state any material fact required to be stated therein or necessary in order
     to make the statements  therein,  in light of the circumstances under which
     they are made, not misleading.

     3.17 Valid Issuance.  Subject to Section 1.5(b),  the Castelle Common Stock
to be issued in the Merger will,  when issued in accordance  with the provisions
of this Agreement, be validly issued, fully paid and nonassessable.

                                       43
<PAGE>

SECTION 4. CERTAIN COVENANTS OF IBEX AND THE DESIGNATED SHAREHOLDERS

     4.1 Access  and  Investigation.  During  the  period  from the date of this
Agreement through the Effective Time (the "Pre-Closing Period"), Ibex shall, and
shall  cause  its  Representatives  to:  (a)  provide  Castelle  and  Castelle's
Representatives with reasonable access to Ibex's Representatives,  personnel and
assets and to all existing books,  records,  Tax Returns,  work papers and other
documents  and  information  relating  to Ibex;  and (b)  provide  Castelle  and
Castelle's  Representatives  with copies of such existing  books,  records,  Tax
Returns,  work papers and other documents and information  relating to Ibex, and
with  such  additional  financial,  operating  and  other  data and  information
regarding Ibex, as Castelle may reasonably request.

     4.2 Operation of Ibex's Business. During the Pre-Closing Period:

     (a) Ibex shall conduct its business and  operations in the ordinary  course
     and in  substantially  the same manner as such business and operations have
     been conducted prior to the date of this Agreement;

     (b) Ibex shall use  reasonable  efforts  to  preserve  intact  its  current
     business organization,  keep available the services of its current officers
     and employees and maintain its relations and good will with all  suppliers,
     customers,   landlords,  creditors,  employees  and  other  Persons  having
     business relationships with Ibex;

     (c) Ibex shall keep in full force all insurance policies identified in Part
     2.17 of the Disclosure Schedule;

     (d) Ibex shall cause its officers to report regularly (but in no event less
     frequently  than  weekly)  to  Castelle  concerning  the  status  of Ibex's
     business;

     (e) Ibex shall not declare,  accrue,  set aside or pay any dividend or make
     any other distribution in respect of any shares of capital stock, and shall
     not repurchase,  redeem or otherwise  reacquire any shares of capital stock
     or other securities (except that Ibex may repurchase Ibex Common Stock from
     former  employees  pursuant  to the  terms  of  existing  restricted  stock
     purchase agreements);

     (f) Ibex shall not sell, issue or authorize the issuance of (i) any capital
     stock or other  security,  (ii) any option or right to acquire  any capital
     stock or  other  security,  or (iii)  any  instrument  convertible  into or
     exchangeable  for any capital  stock or other  security  (except  that Ibex
     shall be  permitted,  (x) to issue Ibex Common Stock to employees  upon the
     exercise  of  outstanding  Ibex  Options,  and (y) to issue  shares of Ibex
     Common Stock upon the conversion of shares of Series A Preferred Stock);

     (g) Ibex  shall not amend or waive any of its rights  under,  or permit the
     acceleration  of vesting under,  (i) any provision of its 1992 Stock Option
     Plan, (ii) any provision of any agreement  evidencing any outstanding  Ibex
     Option, or (iii) any provision of any restricted stock purchase agreement;

                                       44
<PAGE>

     (h)  neither  Ibex nor any of the  Designated  Shareholders  shall amend or
     permit the adoption of any amendment to Ibex's articles of incorporation or
     bylaws,  or  effect or  permit  Ibex to  become a party to any  Acquisition
     Transaction,  recapitalization,  reclassification  of shares,  stock split,
     reverse  stock  split or similar  transaction  (except  that Ibex may issue
     shares  of Ibex  Common  Stock  upon the  conversion  of shares of Series A
     Preferred Stock);

     (i) Ibex shall not form any  subsidiary  or acquire any equity  interest or
     other interest in any other Entity;

     (j) Ibex  shall  not make  any  capital  expenditure,  except  for  capital
     expenditures  that,  when added to all other capital  expenditures  made on
     behalf of Ibex  during the  Pre-Closing  Period,  do not exceed  $5,000 per
     month;

     (k) Ibex shall not (i) enter  into,  or permit  any of the assets  owned or
     used by it to become bound by, any Contract  that is or would  constitute a
     Material  Contract,  or (ii) amend or prematurely  terminate,  or waive any
     material right or remedy under, any such Contract;

     (l) Ibex shall not (i)  acquire,  lease or license any right or other asset
     from any other  Person,  (ii)  sell or  otherwise  dispose  of, or lease or
     license,  any right or other asset to any other  Person,  or (iii) waive or
     relinquish  any right,  except for assets  acquired,  leased,  licensed  or
     disposed of by Ibex pursuant to Contracts that are not Material Contracts;

     (m) Ibex shall not (i) lend money to any Person  (except that Ibex may make
     routine travel advances to employees in the ordinary course of business and
     may,  consistent with its past  practices,  allow employees to acquire Ibex
     Common  Stock in  exchange  for  promissory  notes  upon  exercise  of Ibex
     Options), or (ii) incur or guarantee any indebtedness for borrowed money;

     (n) Ibex shall not (i) establish, adopt or amend any Employee Benefit Plan,
     (ii) pay any  bonus  or make any  profit-sharing  payment,  cash  incentive
     payment or similar payment to, or increase the amount of the wages, salary,
     commissions,  fringe benefits or other compensation or remuneration payable
     to, any of its  directors,  officers  or  employees,  or (iii) hire any new
     employee;

     (o) Ibex shall not change any of its methods of  accounting  or  accounting
     practices in any material respect;

     (p) Ibex shall not make any Tax election;

     (q) Ibex shall not commence or settle any material Legal Proceeding;

     (r) Ibex shall not agree or commit to take any of the actions  described in
     clauses "(e)" through "(q)" above.

                                       45
<PAGE>

Notwithstanding  the  foregoing,  Ibex may take any action  described in clauses
"(e)"  through "(r)" above if Castelle  gives its prior  written  consent to the
taking of such action by Ibex,  which consent will not be unreasonably  withheld
(it being  understood that Castelle's  withholding of consent to any action will
not be deemed  unreasonable if Castelle determines in good faith that the taking
of such action would not be in the best interests of Castelle or would not be in
the best interests of Ibex).

     4.3 Notification; Updates to Disclosure Schedule.

     (a) During the Pre-Closing  Period,  Ibex shall promptly notify Castelle in
     writing of:

          (i)  the  discovery  by  Ibex  of  any  event,   condition,   fact  or
          circumstance  that occurred or existed on or prior to the date of this
          Agreement and that caused or  constitutes a material  inaccuracy in or
          breach of any  representation  or warranty  made by Ibex or any of the
          Designated Shareholders in this Agreement;

          (ii) any event, condition, fact or circumstance that occurs, arises or
          exists  after  the  date of this  Agreement  and that  would  cause or
          constitute a material inaccuracy in or breach of any representation or
          warranty made by Ibex or any of the  Designated  Shareholders  in this
          Agreement if (A) such  representation  or warranty had been made as of
          the time of the  occurrence,  existence  or  discovery  of such event,
          condition, fact or circumstance, or (B) such event, condition, fact or
          circumstance  had occurred,  arisen or existed on or prior to the date
          of this Agreement;

          (iii) any breach of any covenant or  obligation  of Ibex or any of the
          Designated Shareholders; and

          (iv) any event,  condition,  fact or circumstance  that would make the
          timely satisfaction of any of the conditions set forth in Section 6 or
          Section 7 impossible or unlikely.

     (b) If any event,  condition,  fact or circumstance  that is required to be
     disclosed  pursuant to Section 4.3(a) requires any change in the Disclosure
     Schedule,  or if any such  event,  condition,  fact or  circumstance  would
     require such a change assuming the Disclosure Schedule were dated as of the
     date of the  occurrence,  existence or discovery of such event,  condition,
     fact or  circumstance,  then Ibex shall  promptly  deliver to  Castelle  an
     update to the Disclosure  Schedule  specifying such change.  No such update
     shall be deemed to  supplement  or amend the  Disclosure  Schedule  for the
     purpose of determining whether any of the conditions set forth in Section 6
     has been satisfied.

                                       46
<PAGE>

SECTION 5. ADDITIONAL COVENANTS OF THE PARTIES

     5.1 Filings and Consents. As promptly as practicable after the execution of
this Agreement, each party to this Agreement (a) shall make all filings (if any)
and give all  notices  (if any)  required  to be made and given by such party in
connection  with the  Merger  and the other  transactions  contemplated  by this
Agreement,  and (b) shall use all commercially  reasonable efforts to obtain all
Consents  (if any)  required to be obtained  (pursuant to any  applicable  Legal
Requirement  or Contract,  or otherwise)  by such party in  connection  with the
Merger and the other  transactions  contemplated by this  Agreement.  Ibex shall
(upon  request)  promptly  deliver to Castelle a copy of each such filing  made,
each such  notice  given and each  such  Consent  obtained  by Ibex  during  the
Pre-Closing Period.

     5.2 California  Permit;  Fairness Hearing.  Promptly after the execution of
this  Agreement,  Ibex and Castelle shall prepare and cause to be filed with the
California Commissioner of Corporations (the "California Commissioner") a permit
application  under  Section 25121 of the  California  Corporations  Code,  and a
related  information  statement or other disclosure  document (the  "Information
Statement"),  and  shall  request  a hearing  on the  fairness  of the terms and
conditions  of  the  Merger   pursuant  to  Section  25142  of  the   California
Corporations  Code.  The parties to this  Agreement  shall use all  commercially
reasonable efforts to cause the California  Commissioner to approve the fairness
of the terms and conditions of the Merger at such a hearing; provided,  however,
that Castelle  shall not be required to modify any of the terms of the Merger in
order to cause the California Commissioner to approve the fairness of such terms
and conditions. Ibex shall provide and include in the Information Statement such
information  relating  to Ibex as may be  required  pursuant to the rules of the
California   Commissioner.   The   Information   Statement   shall  include  the
recommendation of the board of directors of Ibex in favor of the Merger.

     5.3 Ibex Shareholders' Meeting. Ibex shall, in accordance with its articles
of  incorporation  and bylaws and the applicable  requirements of the CGCL, call
and hold a special  meeting of its  shareholders  as promptly as practicable for
the  purpose of  permitting  them to  consider  and to vote upon and approve the
Merger  and  this  Agreement  (the  "Ibex  Shareholders'  Meeting").  As soon as
permissible  under  the  rules  of the  California  Commissioner  or the SEC (as
applicable),  Ibex  shall  cause  a copy  of the  Information  Statement  or the
Prospectus/Proxy  Statement (as applicable) to be delivered to each  shareholder
of Ibex who is entitled to vote at the Ibex Shareholders'  Meeting. Each Signing
Shareholder  shall cause all shares of the capital stock of Ibex that are owned,
beneficially  or of record,  by such Signing  Shareholder on the record date for
Ibex Shareholders' Meeting to be voted in favor of the Merger and this Agreement
at such meeting.

     5.4 Public  Announcements.  During the Pre-Closing Period, (a) neither Ibex
nor any of the Designated  Shareholders  shall (and Ibex shall not permit any of
its  Representatives  to) issue any press  release or make any public  statement
regarding  this  Agreement  or  the  Merger,  or  regarding  any  of  the  other
transactions  contemplated by this Agreement,  without  Castelle's prior written
consent, and (b) Castelle will use reasonable efforts to consult with Ibex prior
to  issuing  any press  release or making any  public  statement  regarding  the
Merger.

                                       47
<PAGE>

     5.5 Pooling of Interests.  During the Pre-Closing  Period, no party to this
Agreement  shall take any action  that could  reasonably  be expected to have an
adverse  effect on the  ability  of  Castelle  to  account  for the  Merger as a
"pooling of interests."

     5.6  Affiliate  Agreements.  Each  Signing  Shareholder  shall  execute and
deliver to Castelle,  and Ibex shall use all commercially  reasonable efforts to
cause each other  Person  identified  on Exhibit C-2 (and any other  Person that
could  reasonably  be deemed to be an  "affiliate"  of Ibex for  purposes of the
Securities Act), to execute and deliver to Castelle,  as promptly as practicable
after the  execution of this  Agreement,  an Affiliate  Agreement in the form of
Exhibit C-1 and a Proxy in the form of Exhibit M.

     5.7  Best  Efforts.  During  the  Pre-Closing  Period,  (a)  Ibex  and  the
Designated Shareholders shall use their best efforts to cause the conditions set
forth in Section 6 to be satisfied on a timely basis, and (b) Castelle shall use
its best efforts to cause the  conditions set forth in Section 7 to be satisfied
on a timely basis.

     5.8 Tax Matters.  Prior to the Closing, (a) Castelle and Ibex shall execute
and deliver,  to Cooley Godward  Castro  Huddleson & Tatum and to Graham & James
LLP, tax  representation  letters in substantially  the form of Exhibit D (which
will be used in  connection  with the legal  opinions  contemplated  by Sections
6.6(j) and 7.3(b),  and (b)  shareholders of Ibex  receiving:  (i) fifty percent
(50%) or more of the Castelle Common Stock issued in the Merger, and (ii) shares
of Castelle Common Stock with a fair market value greater than or equal to fifty
percent (50%) of the aggregate cash payments due under the Employment Agreements
and the Noncompetition  Agreements executed by the persons identified on Exhibit
F (the  "Continuity  of  Interest  Shareholders")  shall  execute and deliver to
Cooley  Godward Castro  Huddleson & Tatum and Graham & James LLP,  Continuity of
Interest  Certificates in the form of Exhibit E with respect to such shares. For
purposes of this Section,  the fair market value of Castelle  Common Stock shall
be the  closing  price  on the  Nasdaq  National  System  on  the  business  day
immediately preceding the Closing Date.

     5.9 Employment and Noncompetition  Agreements.  At or prior to the Closing,
each of the  persons  identified  on  Exhibit F shall  execute  and  deliver  to
Castelle  an  Employment  Agreement  in the form of  Exhibit  G (an  "Employment
Agreement")  and (if indicated on Exhibit F) a  Noncompetition  Agreement in the
form of Exhibit H (a "Noncompetition Agreement").

     5.10 FIRPTA Matters.  At the Closing,  (a) Ibex shall deliver to Castelle a
statement (in such form as may be  reasonably  requested by counsel to Castelle)
conforming  to the  requirements  of Section  1.897 -  2(h)(1)(i)  of the United
States Treasure Regulations,  and (b) Ibex shall deliver to the Internal Revenue
Service the  notification  required  under Section  1.897-2(h)(2)  of the United
States Treasury Regulations.

     5.11 Acquisition  Proposals.  From the date hereof until the earlier of the
termination of this Agreement or the  consummation  of the Merger,  Castelle and
Ibex will not, and will cause their respective officers,  directors,  employees,
agents and representatives not to, directly or indirectly,  encourage,  solicit,

                                       48
<PAGE>

accept,  initiate  or conduct  discussions  or  negotiations  with,  provide any
information to, or enter into any agreement with, any corporation,  partnership,
limited  liability  company,  person  or other  entity or group  concerning  the
acquisition  of all or a  substantial  part of the  assets,  business or capital
stock of Castelle or Ibex,  whether  through  purchase,  merger,  consolidation,
exchange  or  any  other  business  combination  (each  of  the  foregoing,   an
"Acquisition  Proposal").  Notwithstanding  anything  to  the  contrary  in  the
preceding  sentence,  nothing  herein  shall  prevent  Castelle  or Ibex and its
officers and directors,  from  responding to and  considering  unsolicited  firm
offers for any such transaction from other persons if and to the extent that, in
the written opinion of Castelle or Ibex outside counsel,  respectively,  failure
to do so would be reasonably  likely to constitute a violation of applicable law
or a  breach  of  the  fiduciary  duties  of  that  company's  directors  to its
shareholders. Each company shall immediately provide written notice to the other
company  of the terms and  other  details  of any such  unsolicited  inquiry  or
proposal relating to an Acquisition Proposal. In the event that Castelle or Ibex
or any of their  officers  or  directors  enters into any such  negotiations  or
discussions  for any reason  which  thereby  constitute a breach of this Section
5.11,  such  company  shall  immediately  reimburse  the other  company  for all
expenses and costs incurred by that company in connection with the  transactions
contemplated by this Agreement.  In the event that Castelle or Ibex any of their
officers or directors  shall enter into any letter of intent,  understanding  or
other  agreement  with another  party  relating to the  acquisition  of all or a
substantial  part of the assets,  business or capital stock of Castelle or Ibex,
as, applicable, whether through purchase, merger, consolidation, exchange or any
other  business  combination,  either in violation of the no-shop  agreement set
forth in this  Section  or within  nine (9)  months  after  termination  of this
Agreement  for any reason,  then  immediately  upon entering into such letter of
intent,  understanding or other agreement, such company shall pay to Castelle or
Ibex,  as  applicable,  a  termination  fee  in  the  amount  of  $250,000  (the
"Termination Fee");  provided,  however,  that such Termination Fee shall not be
payable  if,  prior to the entry by such  company  into such  letter of  intent,
understanding  or  other   agreement,   Castelle  or  Ibex,  as  applicable  has
unilaterally  declined to close the Merger.  The parties  acknowledge  and agree
that the expense reimbursement  obligation and Termination Fee described in this
Section shall not be the exclusive remedy to the injured party in the event of a
breach of this  Agreement,  and, in any such event,  the injured  party shall be
entitled,  in  addition to  receiving  such  payments,  to  equitable  remedies,
including, without limitation, specific performance and enjoining of any actions
determined to be in breach of this Agreement.

SECTION 6. CONDITIONS PRECEDENT TO OBLIGATIONS OF CASTELLE

     The  obligations of Castelle to effect the Merger and otherwise  consummate
the transactions contemplated by this Agreement are subject to the satisfaction,
at or prior to the Closing, of each of the following conditions:

     6.1 Satisfactory  Completion of Pre-Acquisition Review. Castelle shall have
satisfactorily  completed its pre-acquisition  investigation and review of Ibex'
business, condition, assets, liabilities, operations, financial performance, net
income  and  prospects  and  shall  be  satisfied   with  the  results  of  that
investigation and review.

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<PAGE>

     6.2 Accuracy of Representations. Each of the representations and warranties
made by Ibex and the  Designated  Shareholders  in this Agreement and in each of
the other  agreements and  instruments  delivered to Castelle in connection with
the transactions  contemplated by this Agreement shall have been accurate in all
material respects as of the date of this Agreement, and shall be accurate in all
material  respects as of the Scheduled  Closing Time as if made at the Scheduled
Closing Time (without giving effect to any update to the Disclosure Schedule).

     6.3  Performance of Covenants.  All of the covenants and  obligations  that
Ibex and the Designated  Shareholders  are required to comply with or to perform
at or prior to the Closing  shall have been  complied  with and performed in all
respects.

     6.4 Shareholder Approval. The principal terms of the Merger shall have been
duly approved by the affirmative  vote of at least (a) 98% of the shares of Ibex
Common  Stock  entitled to vote with respect  thereto,  (b) all of the shares of
Series A Preferred Stock entitled to vote with respect  thereto,  and 51% of the
shares of Castelle Common Stock entitled to vote with respect thereto.

     6.5 Consents.  All Consents  required to be obtained in connection with the
Merger and the other transactions  contemplated by this Agreement (including the
Consents  identified in Part 2.21 of the  Disclosure  Schedule)  shall have been
obtained and shall be in full force and effect.

     6.6 Agreements  and  Documents.  Castelle shall have received the following
agreements and documents (referred to herein as the "Transactional  Documents"),
each of which shall be in full force and effect:

     (a) Affiliate Agreements in the form of Exhibit C-1 and Proxies in the form
     of Exhibit M, executed by the Persons  identified on Exhibit C-2 and by any
     other Person who could  reasonably be deemed to be an  "affiliate"  of Ibex
     for purposes of the Securities Act;

     (b)  Employment  Agreements  in the  form of  Exhibit  G,  executed  by the
     individuals identified on Exhibit F;

     (c)  Noncompetition  Agreements  in the form of Exhibit H,  executed by the
     individuals identified on Exhibit F;

     (d)   confidential   invention  and   assignment   agreements,   reasonably
     satisfactory  in form and  content to  Castelle,  executed  by all  current
     employees  of  Ibex  and  by  all  current   consultants   and  independent
     contractors to Ibex who have not already signed such agreements  (including
     the current employees,  consultants and independent  contractors identified
     in Part 2.9(f) of the Disclosure Schedule);

     (e) the statement referred to in Section 5.10(a), executed by Ibex;

                                       50
<PAGE>

     (f) Continuity of Interest  Certificates in the form of Exhibit E, executed
     by the Continuity of Interest Shareholders;

     (g) an  estoppel  certificate,  dated as of a date not more  than five days
     prior to the Closing Date and satisfactory in form and content to Castelle,
     executed  by Cameron &  Associates,  629 J Street,  Sacramento,  California
     95812 and Shelter Bay Company, 655 Redwood Highway, Suite 177, Mill Valley,
     California 94941.

     (h) a legal opinion of Graham & James LLP, dated as of the Closing Date, in
     the form of Exhibit I;

     (i) a legal opinion of Cooley Godward Castro Huddleson & Tatum, dated as of
     the Closing Date, in the form of Exhibit J;

     (j) a legal opinion of Cooley Godward Castro Huddleson & Tatum, dated as of
     the Closing Date and reasonably  satisfactory  to Ibex and its counsel,  to
     the effect  that the Merger will  constitute  a  reorganization  within the
     meaning of Section 368 of the Code (it being  understood that, in rendering
     such  opinion,  such counsel may rely upon the tax  representation  letters
     referred to in Section 5.8(a) and the  Continuity of Interest  Certificates
     referred to in Section 5.8(b));

     (k) a letter from  Coopers & Lybrand  LLP,  dated as of the  Closing  Date,
     confirming  that (a)  Castelle  may account for the Merger as a "pooling of
     interests" in accordance  with generally  accepted  accounting  principles,
     Accounting  Principles  Board  Opinion  No.  16 and  all  published  rules,
     regulations and policies of the SEC, and (b) confirming that no transaction
     entered into by Ibex, and no other fact or  circumstance  relating to Ibex,
     will  prevent  Castelle  from  accounting  for the Merger as a "pooling  of
     interests" in accordance  with generally  accepted  principles,  Accounting
     Principles  Board Opinion No. 16 and all published  rules,  regulations and
     policies of the SEC; and

     (l) a certificate  executed by the Designated  Shareholders  and containing
     the representation and warranty of each Designated Shareholder that each of
     the  representations  and  warranties set forth in Section 2 is accurate in
     all respects as of the Closing Date as if made on the Closing Date and that
     the  conditions  set forth in Sections 6.2, 6.3, 6.4 and 6.5 have been duly
     satisfied (the "Designated Shareholders' Closing Certificate").

     6.7 FIRPTA  Compliance.  Ibex shall  have filed with the  Internal  Revenue
Service the notification referred to in Section 5.10(b).

     6.8 Securities Compliance. Either:

     (a) the  California  Commissioner  shall have issued a permit under Section
     25121 of the  California  Corporations  Code  (following a hearing upon the
     fairness of the terms and conditions of the Merger,  conducted  pursuant to

                                       51
<PAGE>

     Section 25142 of the California  Corporations Code) for the issuance of the
     Castelle  Common  Stock to be  issued  in the  Merger,  and all  applicable
     requirements  of Section  3(a)(10)  of the  Securities  Act shall have been
     satisfied, or

     (b) a registration statement on Form S-4 covering the Castelle Common Stock
     to be issued in the Merger shall have been declared effective in accordance
     with the  provisions  of the  Securities  Act, and no stop order shall have
     been issued by the SEC with respect to the S-4 Registration Statement.

     6.9 No Restraints. No temporary restraining order, preliminary or permanent
injunction or other order  preventing the  consummation of the Merger shall have
been issued by any court of  competent  jurisdiction  and remain in effect,  and
there shall not be any Legal  Requirement  enacted or deemed  applicable  to the
Merger that makes consummation of the Merger illegal.

     6.10 Comfort  Letter.  Should  Castelle  elect to file an S-4  Registration
Statement,  Castelle  shall have  received a letter from  Coopers & Lybrand LLP,
dated  no  more  than  two  business  days  before  the  date on  which  the S-4
Registration Statement became effective (and reasonably satisfactory in form and
substance to  Castelle),  that is customary in scope and  substance  for letters
delivered by  independent  public  accountants in connection  with  registration
statements similar to the S-4 Registration Statement.

     6.11 No Legal Proceedings.  No Person shall have commenced or threatened to
commence any Legal Proceeding  challenging or seeking the recovery of a material
amount of damages in connection  with the Merger or seeking to prohibit or limit
the exercise by Castelle of any material right  pertaining to its acquisition of
Ibex.

     6.12  Amendment  of  Fourth  Amended  and  Restated   Registration   Rights
Agreement.  Amendment  of the Fourth  Amended and Restated  Registration  Rights
Agreement to include the  registration  rights granted the Signing  Shareholders
shall have been approved by Silicon Valley Bank and the holders of a majority of
the shares necessary to cause such amendment.

SECTION 7. CONDITIONS PRECEDENT TO OBLIGATIONS OF IBEX

     The  obligations of Ibex to effect the Merger and otherwise  consummate the
transactions contemplated by this Agreement are subject to the satisfaction,  at
or prior to the Closing, of the following conditions:

     7.1 Accuracy of Representations. Each of the representations and warranties
made by  Castelle in this  Agreement  shall have been  accurate in all  material
respects  as of the  date  of  this  Agreement  (without  giving  effect  to any
materiality  or similar  qualifications  contained in such  representations  and
warranties),  and shall be accurate in all material respects as of the Scheduled
Closing Time as if made at the Scheduled  Closing Time (without giving effect to
any materiality or similar qualifications  contained in such representations and
warranties).

                                       52
<PAGE>

     7.2  Performance of Covenants.  All of the covenants and  obligations  that
Castelle  is  required  to comply  with or to perform at or prior to the Closing
shall have been complied with and performed in all respects.

     7.3 Documents. Ibex shall have received:

     (a) a legal opinion of Cooley Godward Castro Huddleson & Tatum, dated as of
     the Closing Date, in the form of Exhibit J;

     (b) a legal opinion of Graham & James LLC, dated as of the Closing Date and
     reasonably satisfactory to Castelle and its counsel, to the effect that the
     Merger will constitute a  reorganization  within the meaning of Section 368
     of the Code (it being  understood  that, in rendering  such  opinion,  such
     counsel may rely upon the tax representation letters referred to in Section
     5.8(a) and the Continuity of Interest  Certificates  referred to in Section
     5.8(b);

     (c) Continuity of Interest  Certificates in the form of Exhibit E, executed
     by the Continuity of Interest Shareholders.

     7.4 Shareholder Approval. The principal terms of the Merger shall have been
duly approved by the affirmative  vote of at least (a) 98% of the shares of Ibex
Common  Stock  entitled to vote with respect  thereto,  (b) all of the shares of
Series A Preferred Stock entitled to vote with respect  thereto,  and 51% of the
shares of Castelle Common Stock entitled to vote with respect thereto.

     7.5 No Restraints. No temporary restraining order, preliminary or permanent
injunction or other order  preventing the  consummation of the Merger shall have
been issued by any court of  competent  jurisdiction  and remain in effect,  and
there shall not be any Legal  Requirement  enacted or deemed  applicable  to the
Merger that makes consummation of the Merger illegal.

     7.6 Consents.  All Consents  required to be obtained in connection with the
Merger and the other transactions  contemplated by this Agreement (including the
Consents  identified in Part 3.15 of the  Disclosure  Schedule)  shall have been
obtained and shall be in full force and effect.

     7.7 Securities Compliance. Either:

     (a) the  California  Commissioner  shall have issued a permit under Section
     25121 of the  California  Corporations  Code  (following a hearing upon the
     fairness of the terms and conditions of the Merger,  conducted  pursuant to
     Section 25142 of the California  Corporations Code) for the issuance of the
     Castelle  Common  Stock to be  issued  in the  Merger,  and all  applicable
     requirements of Section 3(a)(10) of the Securities Act have been satisfied,
     or

                                       53
<PAGE>

     (b) a registration statement on Form S-4 covering the Castelle Common Stock
     to be issued in the Merger shall have been declared effective in accordance
     with the  provisions  of the  Securities  Act, and no stop order shall have
     been issued by the SEC with respect to the S-4 Registration Statement.

     7.8 No Legal  Proceedings.  No Person shall have commenced or threatened to
commence any Legal Proceeding  challenging or seeking the recovery of a material
amount of damages in connection  with the Merger or seeking to prohibit or limit
the exercise by Castelle of any material right  pertaining to its acquisition of
Ibex.

SECTION 8. TERMINATION

     8.1  Termination  Events.  This  Agreement may be  terminated  prior to the
Closing:

     (a)  by  Castelle  if  Castelle  reasonably   determines  that  the  timely
     satisfaction of any condition set forth in Section 6 has become  impossible
     (other  than as a result of any  failure on the part of  Castelle to comply
     with or perform any  covenant or  obligation  of Castelle set forth in this
     Agreement);

     (b) by Ibex if Ibex reasonably  determines that the timely  satisfaction of
     any condition set forth in Section 7 has become impossible (other than as a
     result  of any  failure  on  the  part  of  Ibex  or any of the  Designated
     Shareholders to comply with or perform any covenant or obligation set forth
     in this  Agreement  or in any other  agreement or  instrument  delivered to
     Castelle);

     (c) by Castelle at or after the Scheduled Closing Time if any condition set
     forth in Section 6 has not been satisfied by the Scheduled Closing Time;

     (d) by Ibex at or after the  Scheduled  Closing Time if any  condition  set
     forth in Section 7 has not been satisfied by the Scheduled Closing Time;

     (e) by Castelle  if the  Closing has not taken place on or before  December
     30,  1996 (other than as a result of any failure on the part of Castelle to
     comply with or perform any covenant or  obligation of Castelle set forth in
     this Agreement);

     (f) by Ibex if the Closing has not taken  place on or before  December  30,
     1996  (other  than as a result of the failure on the part of Ibex or any of
     the  Designated  Shareholders  to comply  with or perform  any  covenant or
     obligation  set  forth  in this  Agreement  or in any  other  agreement  or
     instrument delivered to Castelle); or

     (g) by the mutual consent of Castelle and Ibex.

                                       54
<PAGE>

     8.2 Termination Procedures.  If Castelle wishes to terminate this Agreement
pursuant to Section  8.1(a),  Section 8.1(c) or Section  8.1(e),  Castelle shall
deliver to Ibex a written  notice  stating  that  Castelle is  terminating  this
Agreement and setting forth a brief  description  of the basis on which Castelle
is  terminating  this  Agreement.  If Ibex wishes to  terminate  this  Agreement
pursuant to Section 8.1(b), Section 8.1(d) or Section 8.1(f), Ibex shall deliver
to Castelle a written notice stating that Ibex is terminating this Agreement and
setting forth a brief description of the basis on which Ibex is terminating this
Agreement.

     8.3 Effect of  Termination.  If this  Agreement is  terminated  pursuant to
Section 8.1, all further  obligations of the parties under this Agreement  shall
terminate;  provided,  however,  that:  (a) neither Ibex nor  Castelle  shall be
relieved of any  obligation  or liability  arising from any prior breach by such
party of any provision of this Agreement;  (b) the parties shall, in all events,
remain  bound by and  continue  to be  subject  to the  provisions  set forth in
Sections  5.11 and 10; and (c)  Castelle and Ibex shall,  in all events,  remain
bound by and continue to be subject to Section 5.4.

SECTION 9. INDEMNIFICATION, ETC.

     9.1 Survival of Representations, Etc.

     (a) The representations and warranties made by the Designated  Shareholders
     (including  the  representations  and warranties set forth in Section 2 and
     the   representations   and   warranties   set  forth  in  the   Designated
     Shareholders'  Closing  Certificate)  shall  survive  the Closing and shall
     expire on the first  anniversary  of the Closing Date;  provided,  however,
     that the  representations  and  warranties  as to all items  expected to be
     encountered in the audit process shall  terminate  when Castelle  publishes
     its audited  financial  statements  for its fiscal year which  includes the
     Closing Date, and further provided,  however, that if, at any time prior to
     the termination of a specific  representation  or warranty,  any Indemnitee
     (acting in good faith) delivers to Designated Shareholders a written notice
     alleging  the   existence  of  an   inaccuracy  in  or  a  breach  of  such
     representation or warranty made by the Designated Shareholders (and setting
     forth in reasonable detail the basis for such Indemnitee's belief that such
     an inaccuracy or breach may exist) and asserting a claim for recovery under
     Section  9.2 based on such  alleged  inaccuracy  or breach,  then the claim
     asserted in such notice  shall  survive the  termination  of such  specific
     representation  or  warranty  until  such  time as such  claim is fully and
     finally resolved. All representations and warranties made by Castelle shall
     terminate  and  expire  as of the  Effective  Time,  and any  liability  of
     Castelle  with  respect  to  such   representations  and  warranties  shall
     thereupon cease.

     (b) The representations,  warranties, covenants and obligations of Ibex and
     the  Designated  Shareholders,  and the  rights  and  remedies  that may be
     exercised by the Indemnitees, shall not be limited or otherwise affected by
     or as a result of any information  furnished to, or any investigation  made
     by or knowledge of, any of the Indemnitees or any of their Representatives.

                                       55
<PAGE>

     (c) For  purposes  of this  Agreement,  each  statement  or  other  item of
     information  set forth in the  Disclosure  Schedule or in any update to the
     Disclosure  Schedule  shall be deemed to be a  representation  and warranty
     made by Ibex and the Designated Shareholders in this Agreement.

     9.2  Indemnification  by  Designated  Shareholders.   From  and  after  the
Effective Time (but subject to Section  9.1(a)),  the  Designated  Shareholders,
severally,  to the extent of each such  shareholder's  pro rata  interest in the
Escrowed Shares,  shall hold harmless and indemnify each of the Indemnitees from
and against, and shall compensate and reimburse each of the Indemnitees for, any
Damages  which are  directly  or  indirectly  suffered or incurred by any of the
Indemnitees  or to which any of the  Indemnitees  may otherwise  become  subject
(regardless of whether or not such Damages relate to any third-party  claim) and
which  arise from or as a result of, or are  directly  or  indirectly  connected
with:  (i) any  inaccuracy  in or breach of any  representation  or warranty set
forth  in  Section  2 or in the  Designated  Shareholders'  Closing  Certificate
(without  giving effect to any "Material  Adverse  Effect" or other  materiality
qualification or any similar qualification contained or incorporated directly or
indirectly in such  representation or warranty,  but giving effect to any update
to the Disclosure  Schedule delivered by Ibex to Castelle prior to the Closing);
(ii) any breach of any covenant or obligation  of Ibex or any of the  Designated
Shareholders  (including  the covenants set forth in Sections 4 and 5); or (iii)
any Legal  Proceeding  relating to any inaccuracy or breach of the type referred
to in clause "(i)" or "(ii)" above (including any Legal Proceeding  commenced by
any Indemnitee for the purpose of enforcing any of its rights under this Section
9).

     9.3 Threshold;  Ceiling. The Designated  Shareholders shall not be required
to  make  any  indemnification  payment  pursuant  to  Section  9.2(a)  for  any
inaccuracy in or breach of any of their representations and warranties set forth
in Section 2 until such time as the total amount of all Damages  (including  the
Damages  arising from such  inaccuracy or breach and all other  Damages  arising
from any other inaccuracies in or breaches of any representations or warranties)
that have been directly or indirectly suffered or incurred by any one or more of
the  Indemnitees,  or to which  any one or more of the  Indemnitees  has or have
otherwise become subject, exceeds $25,000 in the aggregate. (If the total amount
of such Damages exceeds  $25,000,  then the Indemnitees  shall be entitled to be
indemnified  against and compensated and reimbursed for the aggregate  amount of
Damages, including the initial $25,000.)

     9.4 Escrow  Fund.  Notwithstanding  Section  1.9 of this  Agreement  and in
accordance  with the  provisions  of the  Escrow  Agreement  attached  hereto as
Exhibit L (the "Escrow  Agreement),  the Designated  Shareholders  shall deposit
Castelle  Common  Stock  equal to ten  percent  (10%) of the shares of  Castelle
Common  Stock  to be  received  by the  Ibex  shareholders  as a  result  of the
transactions  contemplated  by the Agreement  (the  "Escrowed  Shares") with the
Escrow  Agent to be held  pursuant  to the terms of the Escrow  Agreement  for a
period of one year from the date of the Closing.  Upon compliance with the terms

                                       56
<PAGE>

of Section 9 of this Agreement and the Escrow Agreement,  and subject to Section
9.3 above, the Indemnitees shall be entitled to obtain indemnity from the Escrow
Fund for Damages covered by Section 9.

     9.5 No Contribution.  Each Designated  Shareholder waives, and acknowledges
and agrees  that he shall not have and shall not  exercise or assert (or attempt
to exercise or assert),  any right of contribution,  right of indemnity or other
right or  remedy  against  the  Surviving  Corporation  in  connection  with any
indemnification obligation or any other liability to which he may become subject
under or in  connection  with this  Agreement  or the  Designated  Shareholders'
Closing Certificate.

     9.6 Interest.  Any Designated Shareholder who is required to hold harmless,
indemnify,  compensate  or reimburse any  Indemnitee  pursuant to this Section 9
with respect to any Damages shall also be liable to such Indemnitee for interest
on the amount of such Damages (for the period commencing as of the date on which
such  Designated  Shareholder  first received  notice of a claim for recovery by
such Indemnitee and ending on the date on which the liability of such Designated
Shareholder  to  such   Indemnitee  is  fully   satisfied  by  such   Designated
Shareholder) at a floating rate equal to the rate of interest publicly announced
by Bank of  America,  N.T.  & S.A.  from  time  to  time as its  prime,  base or
reference rate.

     9.7  Defense  of Third  Party  Claims.  In the  event of the  assertion  or
commencement  by any Person of any claim or Legal  Proceeding  (whether  against
Castelle  or  against  any  other  Person)  with  respect  to  which  any of the
Designated  Shareholders  may  become  obligated  to hold  harmless,  indemnify,
compensate  or reimburse  any  Indemnitee  pursuant to this Section 9,  Castelle
shall have the right, at its election, to proceed with the defense of such claim
or Legal  Proceeding on its own. If Castelle so proceeds with the defense of any
such claim or Legal Proceeding:

     (a) all reasonable  expenses relating to the defense of such claim or Legal
     Proceeding   shall  be  borne  and  paid   exclusively  by  the  Designated
     Shareholders;

     (b) each  Designated  Shareholder  shall make  available  to  Castelle  any
     documents and materials in his  possession or control that may be necessary
     to the defense of such claim or Legal Proceeding; and

     (c)  Castelle  shall have the right to settle,  adjust or  compromise  such
     claim or Legal Proceeding with the consent of the Designated  Shareholders'
     Agent (as defined in Section 10.1);  provided,  however,  that such consent
     shall not be unreasonably withheld.

Castelle  shall give the  Designated  Shareholders'  Agent prompt  notice of the
commencement of any such Legal Proceeding against Castelle;  provided,  however,
that  any  failure  on  the  part  of  Castelle  to  so  notify  the  Designated
Shareholders'  Agent  shall  not limit any of the  obligations  of the  Designed
Shareholders  under this Section 9 (except to the extent such failure materially
prejudices the defense of such Legal Proceeding).

                                       57
<PAGE>

     9.8 Exercise of Remedies by Indemnitees Other Than Castelle.  No Indemnitee
(other  than  Castelle  or any  successor  thereto or assign  thereof)  shall be
permitted to assert any indemnification claim or exercise any other remedy under
this  Agreement  unless  Castelle (or any successor  thereto or assign  thereof)
shall have  consented  to the  assertion  of such  indemnification  claim or the
exercise of such other remedy. Such consent shall be evidenced by the submission
by Castelle of such claim to the Designated Shareholders' Representative.

     9.9  Claims  Against   Consideration.   Upon  delivery  to  the  Designated
Shareholders' Agent (with a copy to Escrow Agent, as such term is defined in the
form of Escrow Agreement  attached hereto as Exhibit L) of a certificate  signed
by any officer of Castelle (an "Officer's Certificate"):

     (a) stating that an Indemnitee  has paid or properly  accrued or reasonably
     anticipates  that it will have to pay or  accrue  Damages  in an  aggregate
     stated amount to which an  Indemnitee is entitled to indemnity  pursuant to
     this Agreement (the "Claim Amount"); and

     (b)  specifying  in  reasonable  detail  the  individual  items of  Damages
     included  in the  amount  so  stated,  the date  each such item was paid or
     properly  accrued,  or the basis for such  anticipated  liability,  and the
     nature of the  misrepresentation,  breach of warranty,  legal proceeding or
     claim to which such item is related,  the  Indemnitee  shall be entitled to
     indemnification for such Damages.

     (c) Castelle and the  Indemnitees  shall use reasonable  efforts to provide
     such Officer's  Certificate  within a reasonable time following the date of
     payment,  accrual or reasonable  anticipation of liability, as the case may
     be.

     9.10 Objections to Claims.  For a period of twenty (20) business days after
delivery of any Officer's Certificate to the Designated Shareholders' Agent, the
Indemnitees  shall not take further actions to seek  indemnification.  After the
expiration of such twenty (20 business day period,  the Indemnitees shall become
irrevocably entitled to seek indemnification  under the terms of this Agreement,
if the Designated  Shareholders' Agent shall not have objected in writing to the
claim  made in the  Officer's  Certificate,  and shall not have  delivered  such
written objection to Castelle prior to the expiration of such ten day period.

     9.11 Resolution of Conflicts; Arbitration

     (a) In case the Designated Shareholders' Agent so objects in writing to the
     indemnity of the  Indemnitees in respect of any claim or claims made in any
     Officer's   Certificate,   the  Designated   Shareholders'  Agent  and  the
     Indemnitees  shall  attempt  in good  faith to agree upon the rights of the
     respective  parties with respect to each of such claims.  If the Designated
     Shareholders'  Agent and the  Indemnitees  so agree,  a memorandum  setting
     forth such agreement  shall be prepared and signed by the  Indemnitees  and
     the Designated  Shareholders'  Agent,  which agreement shall be binding and
     conclusive on the Indemnitees and the Designated  Shareholders (a "Response
     Notice").

                                       58
<PAGE>

     (b) If no such  agreement  can be reached  after  good  faith  negotiation,
     either the  Indemnitees  or the Designated  Shareholders'  Agent may demand
     arbitration  of the matter by serving a written  demand for  arbitration on
     the other (the "Demand for Arbitration");  provided,  however,  that if the
     amount of the Damages is at issue in pending litigation with a third party,
     arbitration shall not be commenced until such amount is ascertained or both
     parties agree to arbitration. The decision of the arbitrator so selected as
     to the validity and amount of any claim in such Officer's Certificate shall
     be  binding  and  conclusive   upon  the  Indemnitees  and  the  Designated
     Shareholders.

     (c) Any such arbitration shall be held in San Francisco,  California before
     the single arbitrator under the commercial arbitration rules then in effect
     of the American Arbitration Association ("AAA"), except as modified herein.

          (i) Selection. The single arbitrator shall have at least five years of
          experience in commercial dispute  resolution.  The arbitrator shall be
          selected  by  mutual   agreement   between  the  Indemnitees  and  the
          Designated  Shareholders'  Agent,  but if they  cannot  agree upon the
          selection  within ten days after Demand for Arbitration is given,  the
          selection shall occur as follows: (a) the party initiating arbitration
          shall obtain a list of seven arbitrators,  each of whom shall have the
          requisite experience described above, from the San Francisco office of
          the AAA and simultaneously give a copy thereof to the other party; (b)
          each party  alternately  shall strike three names from the list,  with
          the other party striking first; and (c) the last remaining  arbitrator
          shall be deemed selected by the parties as a single  arbitrator.  If a
          party  refuses for ten or more days to complete  this  selection,  the
          other party shall select a name from the list to be the  arbitrator at
          the end of such ten day period.

          (ii)  Procedure.  Arbitration  shall  be  conducted  in the  following
          manner:

               (a) If the  responding  party  desires to file a response  and/or
               counterclaim to the Demand for Arbitration,  it must do so within
               ten calendar  days after  service of the Demand for  Arbitration.
               Any response to a  counterclaim  shall be filed and served within
               ten calendar days after service of the counterclaim,  but no such
               response shall be required.  A failure to file a counterclaim  or
               response will not operate to delay the arbitration proceedings.

               (b)  After  the  filing  of  the  Demand  for  Arbitration,   any
               counterclaim  and any  responses  thereto,  no further  claims or
               counterclaims  may be made except by order of the arbitrator made
               on a duly noticed motion to the arbitrator.

               (c) The arbitration  shall commence as soon as possible but in no
               event earlier than ten days after selection of the arbitrator and
               in no event later than 30 days  following  the filing of the last
               response  under (b)  above,  or if there is none,  following  the
               Demand for Arbitration.

                                       59
<PAGE>

               (d)   the   Indemnitees   and   the   Designated    Shareholders'
               Representative  (acting on behalf of the Designated  Shareholders
               and being  entitled to  reimbursement  under  Section 10.1) shall
               each pay an equal  share of the fees and  expenses  of any person
               serving  as  an  arbitrator.   The  arbitrator,  in  his  or  her
               discretion,  shall be authorized to determine  whether a party is
               the prevailing  party,  and if so, to award that prevailing party
               reimbursement  for  its  share  of  the  costs  and  fees  of the
               arbitrator, and reimbursement for its reasonable attorneys' fees,
               disbursements and costs incurred in such arbitration.

               (e) The arbitrator,  upon application of any party,  shall hold a
               pre-hearing  conference  with  the  parties  for the  purpose  of
               narrowing  the  issues,   establishing   a  discovery   schedule,
               arranging  an  acceptable   procedure  for  any  law  and  motion
               proceedings   and  in  all  respects   arranging   for  the  most
               expeditious  hearing  possible of the  matters in  dispute.  Such
               conference shall be held as soon as possible following  selection
               of the arbitrator,  any counterclaim  thereto and any response to
               such  counterclaim  (if any),  but in no event later than 20 days
               following the filing of the last response under (b) above,  or if
               there is none, following the Demand for Arbitration.

               (f) Discovery shall be conducted in accordance with Part 3, Title
               9,  Chapter  3 of the  California  Code of  Civil  Procedure,  as
               amended from time to time.

               (g) Except as  expressly  provided in this  Section  9.11.3,  the
               arbitration   hearing   shall  be  conducted   according  to  the
               discretion  of the  arbitrator.  Judicial  rules  relating to the
               order of proof,  the conduct of the hearing and the  presentation
               and admissibility of evidence need not be followed.  Any relevant
               information, including hearsay, may be admitted by the arbitrator
               regardless  of its  admissibility  as evidence in court,  but the
               arbitrator  also shall be  authorized  to exclude  evidence.  The
               parties shall have the power to subpoena  witnesses to attend the
               arbitration   hearing   pursuant  to  California  Code  of  Civil
               Procedure Section 1282.6. The arbitrator shall have full power to
               give such  directions  and to make such  orders in the conduct of
               the arbitration, including setting pre-arbitration procedures and
               scheduling any motions to correct or amend the arbitration award,
               as he or she deems just and appropriate,  including  specifically
               the  right  to make  such  reasonable  extensions  of time as the
               arbitrator  determines  are necessary to  accommodate  discovery,
               prearbitration procedures,  motions, settlement discussions,  and
               other such matters, but not in any event to exceed 30 days in the
               aggregate,  from the date the arbitration was otherwise scheduled
               to commence as provided above.

               (h) The arbitrator  shall,  within five days after the conclusion
               of the arbitration hearing,  issue a written decision and a brief
               written  statement  of  decision  describing  the reasons for the
               decision,  including the calculation of any compensatory  damages
               awarded.

               (i) Absent the filing of an  application to correct or vacate the
               arbitration  award as provided  in section (j) below,  each party
               shall fully  perform  and  satisfy  the terms of the  arbitration
               decision within 15 days of the service of the decision.

                                       60
<PAGE>

               (j) The  decision  of the  arbitrator  shall be final and binding
               upon the parties  without appeal or review except as permitted by
               California law; provided,  however, that either party may, within
               ten days of the service of the decision,  file an  application to
               correct or vacate the arbitration  award or an application for de
               novo  review on all  questions  of law based on the  arbitrator's
               finding  of  fact  (which  are  deemed  for  such  purpose  to be
               stipulated by the parties),  in either case under California Code
               of Civil  Procedure  Section  1285 et seq. Any party may apply to
               any court of competent jurisdiction for confirmation and entry of
               judgment based on said award.  In connection with any application
               to review  questions of law or to confirm,  correct or vacate the
               arbitration  award, any appeal of any order rendered  pursuant to
               any such application, or any other action required to enforce the
               arbitration  award,  the  prevailing  party  shall be entitled to
               recover its reasonable  attorneys' fees,  disbursements and costs
               incurred in such post-award activities.

     (d) The arbitrator  shall not have the power to vary the provisions of this
     Agreement.  The parties hereby  irrevocably waive, and the arbitrator shall
     have no power to award,  any  damages  for pain and  suffering  or punitive
     damages.

     (e) By signing  below,  each party  acknowledges  that (a) the  arbitration
     provisions  of this  Agreement  require the party to give up rights to have
     the dispute  litigated  in a court or jury trial,  and to give up rights to
     discovery  and most grounds for appeal,  and (b) the party may be compelled
     to arbitrate if the party refuses to do so.

SECTION 10. MISCELLANEOUS PROVISIONS

     10.1 Designated  Shareholders'  Agent. The Designated  Shareholders  hereby
irrevocably  appoint  Ney Grant as their  agent for  purposes  of Section 9 (the
"Designated  Shareholders' Agent"), and Ney Grant hereby accepts his appointment
as the  Designated  Shareholders'  Agent.  Castelle  shall be  entitled  to deal
exclusively with the Designated  Shareholders'  Agent on all matters relating to
Section 9, and shall be entitled to rely conclusively  (without further evidence
of any kind whatsoever) on any document  executed or purported to be executed on
behalf of any Designated Shareholder by the Designated  Shareholders' Agent, and
on any other action  taken or purported to be taken on behalf of any  Designated
Shareholder by the Designated  Shareholders'  Agent,  as fully binding upon such
Designated Shareholder.  If the Designated Shareholders' Agent shall die, become
disabled or otherwise be unable to fulfill his  responsibilities as agent of the
Designated Shareholders, then the Designated Shareholders shall, within ten days
after  such  death or  disability,  appoint  a  successor  agent  and,  promptly
thereafter,  shall notify Castelle of the identity of such  successor.  Any such
successor  shall  become the  "Designated  Shareholders'  Agent" for purposes of
Section 9 and this  Section  10.1.  The  Designated  Shareholders'  Agent  shall
receive  no  compensation  for his  services,  but shall be  reimbursed  for his
reasonable  out-of-pocket expenses by the Designated  Shareholders in proportion
to the  number of shares  of  Castelle  Common  Stock  received  by each of them
pursuant  to  this  Agreement.   If  for  any  reason  there  is  no  Designated
Shareholders'  Agent  at any  time,  all  references  herein  to the  Designated
Shareholders' Agent shall be deemed to refer to the Designated Shareholders.

                                       61
<PAGE>

     10.2 Further  Assurances.  Each party hereto shall  execute and cause to be
delivered to each other party hereto such instruments and other  documents,  and
shall take such other actions, as such other party may reasonably request (prior
to, at or after the Closing) for the purpose of carrying out or  evidencing  any
of the transactions contemplated by this Agreement.

     10.3 Fees and Expenses. Each party to this Agreement shall bear and pay all
fees,  costs and expenses  (including  legal fees and accounting fees) that have
been  incurred  or that  are  incurred  by such  party  in  connection  with the
transactions  contemplated  by this  Agreement,  including  all fees,  costs and
expenses  incurred  by such  party in  connection  with or by  virtue of (a) the
investigation  and review  conducted  by Castelle and its  Representatives  with
respect to Ibex's  business (and the  furnishing of  information to Castelle and
its  Representatives in connection with such investigation and review),  (b) the
negotiation,  preparation and review of this Agreement (including the Disclosure
Schedule) and all agreements,  certificates,  opinions and other instruments and
documents  delivered  or to be  delivered in  connection  with the  transactions
contemplated by this Agreement, (c) the preparation and submission of any filing
or  notice  required  to be  made  or  given  in  connection  with  any  of  the
transactions  contemplated by this  Agreement,  and the obtaining of any Consent
required to be obtained in connection with any of such transactions, and (d) the
consummation  of the Merger;  provided,  however,  that Castelle shall reimburse
Ibex for the first $25,000 of audit fees, costs and expenses invoiced by Coopers
& Lybrand  LLP and  incurred  by Ibex in the audit by  Coopers & Lybrand  LLP of
Ibex's fiscal years ended December 31, 1995 and 1994, as well as one-half of any
additional audit fees, costs and expenses invoiced by Coopers & Lybrand LLP.

     10.4  Attorneys'  Fees.  If any  action  or  proceeding  relating  to  this
Agreement  or the  enforcement  of any  provision  of this  Agreement is brought
against  any party  hereto,  the  prevailing  party shall be entitled to recover
reasonable  attorneys' fees, costs and  disbursements  (in addition to any other
relief to which the prevailing party may be entitled).

     10.5 Notices. Any notice or other communication required or permitted to be
delivered  to any party  under this  Agreement  shall be in writing and shall be
deemed  properly  delivered,  given and received  when  delivered  (by hand,  by
registered  mail, by courier or express delivery service or by facsimile) to the
address or facsimile  telephone  number set forth beneath the name of such party
below (or to such other  address  or  facsimile  telephone  number as such party
shall have specified in a written notice given to the other parties hereto):

               if to Castelle:

                      Attention:  President
                      Castelle
                      3255-3 Scott Boulevard
                      Santa Clara, California  95054
                      Facsimile #:  (408) 654-4699

                                       62
<PAGE>

               with a copy to:

                      Samuel M. Livermore
                      Cooley Godward Castro Huddleson & Tatum
                      One Maritime Plaza, Suite 2000
                      San Francisco, California 94111
                      Facsimile #:  (415) 951-3698

               if to Ibex:

                      Attention:  President
                      Ibex Technologies, Inc.
                      4921 R.J. Mathews Pkwy.
                      El Dorado Hills, California 95762
                      Facsimile #:  (916) 939-8899

               with a copy to:

                      Gilles S. Attia
                      Graham & James LLP
                      400 Capitol Mall, 24th Floor
                      Sacramento, California  95814
                      Facsimile #:  (916) 441-6700

               if to any of the Designated Shareholders:

                      Ney Grant
                      2725 Romer Boulevard
                      Pollock Pines, California  95726
                      Facsimile #:  (916) 647-2055

               if to Teodoro Gimenez, Tucha Limited, or Newark Holding S.A.:

                      Teodoro Ramos Gimenez
                      Tecom Sistemas
                      Rua Jeronimo de Lemos, 162
                      Rio de Janeiro, RJ
                      20560-090 Brazil
                      Facsimile #:  011-55-21-577-1125

                                       63
<PAGE>

               with a copy to:

                      Peter N. Barnes-Brown
                      Morse, Barnes-Brown & Pendleton, P.C.
                      Reservoir Place
                      1601 Trapelo Road
                      Waltham, Massachusetts  02154
                      Facsimile #:  (617) 622-5933

     10.6 Confidentiality. Without limiting the generality of anything contained
in Section  5.4,  on and at all times after the Closing  Date,  each  Designated
Shareholder shall keep confidential,  and shall not use or disclose to any other
Person,  any  non-public  document  or  other  non-public  information  in  such
Designated  Shareholder's  possession  that  relates to the  business of Ibex or
Castelle.

     10.7 Time of the Essence. Time is of the essence of this Agreement.

     10.8 Headings.  The underlined headings contained in this Agreement are for
convenience  of  reference  only,  shall  not be  deemed  to be a part  of  this
Agreement and shall not be referred to in connection  with the  construction  or
interpretation of this Agreement.

     10.9 Counterparts.  This Agreement may be executed in several counterparts,
each of  which  shall  constitute  an  original  and all of  which,  when  taken
together, shall constitute one agreement.

     10.10 Governing Law. This Agreement shall be construed in accordance  with,
and governed in all respects  by, the internal  laws of the State of  California
(without giving effect to principles of conflicts of laws).

     10.11  Successors and Assigns.  This Agreement  shall be binding upon: Ibex
and its successors and assigns (if any); the Designated  Shareholders  and their
respective personal representatives,  executors, administrators, estates, heirs,
successors and assigns (if any); and Castelle and its successors and assigns (if
any).  This Agreement shall inure to the benefit of: Ibex;  Ibex's  shareholders
(to the extent set forth in Section  1.5);  the holders of assumed  Ibex Options
(to the  extent  set forth in  Section  1.6);  Castelle;  the other  Indemnitees
(subject to Section 9.8); and the respective  successors and assigns (if any) of
the foregoing. Subsequent to the Closing Date, Castelle may freely assign any or
all of its rights under this  Agreement  (including its  indemnification  rights
under Section 9), in whole or in part, to any other Person without obtaining the
consent or approval of any other party hereto or of any other Person.

     10.12 Remedies Cumulative; Specific Performance. The rights and remedies of
the parties  hereto shall be cumulative  (and not  alternative).  The parties to
this  Agreement  agree that, in the event of any breach or threatened  breach by
any party to this Agreement of any covenant,  obligation or other  provision set
forth in this  Agreement  for the benefit of any other party to this  Agreement,

                                       64
<PAGE>

such other party shall be entitled  (in addition to any other remedy that may be
available to it) to (a) a decree or order of specific performance or mandamus to
enforce the  observance and  performance  of such covenant,  obligation or other
provision, and (b) an injunction restraining such breach or threatened breach.

     10.13 Waiver.

     (a) No  failure  on the part of any Person to  exercise  any power,  right,
     privilege or remedy under this  Agreement,  and no delay on the part of any
     Person in  exercising  any power,  right,  privilege  or remedy  under this
     Agreement,  shall  operate as a waiver of such power,  right,  privilege or
     remedy;  and no  single  or  partial  exercise  of any such  power,  right,
     privilege or remedy shall preclude any other or further exercise thereof or
     of any other power, right, privilege or remedy.

     (b) No Person shall be deemed to have waived any claim  arising out of this
     Agreement,  or any power, right,  privilege or remedy under this Agreement,
     unless the  waiver of such  claim,  power,  right,  privilege  or remedy is
     expressly set forth in a written  instrument duly executed and delivered on
     behalf of such Person;  and any such waiver shall not be applicable or have
     any effect except in the specific instance in which it is given.

     10.14 Amendments.  This Agreement may not be amended,  modified, altered or
supplemented  other  than by means of a written  instrument  duly  executed  and
delivered on behalf of all of the parties hereto.

     10.15 Severability.  In the event that any provision of this Agreement,  or
the  application  of any such  provision to any Person or set of  circumstances,
shall be  determined  to be  invalid,  unlawful,  void or  unenforceable  to any
extent,  the remainder of this Agreement,  and the application of such provision
to Persons or circumstances  other than those as to which it is determined to be
invalid,  unlawful,  void or  unenforceable,  shall not be impaired or otherwise
affected and shall  continue to be valid and  enforceable  to the fullest extent
permitted by law.

     10.16 Parties in Interest.  Except for the  provisions of Sections 1.5, 1.6
and 9, none of the  provisions  of this  Agreement  is  intended  to provide any
rights or  remedies  to any  Person  other  than the  parties  hereto  and their
respective successors and assigns (if any).

     10.17 Entire Agreement. This Agreement and the other agreements referred to
herein set forth the entire  understanding of the parties hereto relating to the
subject  matter  hereof and  thereof  and  supersede  all prior  agreements  and
understandings  among or between  any of the  parties  relating  to the  subject
matter hereof and thereof.

     10.18 Construction.

     (a) For  purposes of this  Agreement,  whenever the context  requires:  the
     singular  number shall  include the plural,  and vice versa;  the masculine
     gender shall include the feminine and neuter  genders;  the feminine gender
     shall include the masculine and neuter genders; and the neuter gender shall
     include the masculine and feminine genders.

                                       65
<PAGE>

     (b) The parties  hereto agree that any rule of  construction  to the effect
     that ambiguities are to be resolved against the drafting party shall not be
     applied in the construction or interpretation of this Agreement.

     (c) As used in this  Agreement,  the words "include" and  "including,"  and
     variations  thereof,  shall not be deemed  to be terms of  limitation,  but
     rather shall be deemed to be followed by the words "without limitation."

     (d) Except as otherwise  indicated,  all  references  in this  Agreement to
     "Sections"  and  "Exhibits"  are  intended  to  refer to  Sections  of this
     Agreement and Exhibits to this Agreement.


                                       66
<PAGE>


     The parties  hereto have caused this Agreement to be executed and delivered
as of August 22, 1996.

                            CASTELLE,
                            a California corporation



                            By: /s/ Arthur H. Bruno







                            IBEX TECHNOLOGIES, INC.,
                            a California corporation



                            By: /s/ Ney Grant



                               /s/ Betsy Grey-Grant



                               /s/ Clovis Mattos



                               /s/ Curtis Powell



                               /s/ Teodoro Ramos Giminez



                               /s/ on behalf of Newark Holdings S.A.



                               /s/ on behalf of Tucha Limited


                                       67
<PAGE>


                                   EXHIBIT A-1

                             DESIGNATED SHAREHOLDERS





Name
Ney Grant and Betsy Gray-Grant
Clovis Mattos
Curtis Powell



                                       68

<PAGE>


                                   EXHIBIT A-2

                              SIGNING SHAREHOLDERS



Tucha Limited

Newark Holding S.A.

Teodoro Ramos Gimenez
















     Includes  those persons  identified as Designated  Shareholders  on Exhibit
A-1.

                                       69

<PAGE>


                                    EXHIBIT B

                               CERTAIN DEFINITIONS



     For purposes of the Agreement (including this Exhibit B):

     Acquisition   Transaction.   "Acquisition   Transaction"   shall  mean  any
transaction involving:

     (a) the sale,  license,  disposition  or  acquisition  of all or a material
     portion of Ibex's business or assets;

     (b) the issuance,  disposition  or  acquisition of (i) any capital stock or
     other equity  security of Ibex (other than common stock issued to employees
     of  Ibex,   upon  exercise  of  Ibex  Options  or  otherwise,   in  routine
     transactions  in accordance with Ibex's past  practices),  (ii) any option,
     call, warrant or right (whether or not immediately  exercisable) to acquire
     any  capital  stock or other  equity  security  of Ibex  (other  than stock
     options granted to employees of Ibex in routine  transactions in accordance
     with  Ibex's  past  practices),  or  (iii)  any  security,   instrument  or
     obligation that is or may become  convertible  into or exchangeable for any
     capital stock or other equity security of Ibex; or

     (c) any merger,  consolidation,  business  combination,  reorganization  or
     similar transaction involving Ibex.

     Agreement.  "Agreement"  shall  mean the  Agreement  and Plan of Merger and
Reorganization  to which this Exhibit B is attached  (including  the  Disclosure
Schedule), as it may be amended from time to time.

     Ibex Contract.  "Ibex Contract" shall mean any Contract:  (a) to which Ibex
is a party;  (b) by which Ibex or any of its  assets is or may  become  bound or
under which Ibex has, or may become  subject  to, any  obligation;  or (c) under
which Ibex has or may acquire any right or interest.

     Ibex Proprietary Asset. "Ibex Proprietary Asset" shall mean any Proprietary
Asset owned by or licensed to Ibex or otherwise used by Ibex.

     Consent.  "Consent"  shall  mean  any  approval,   consent,   ratification,
permission, waiver or authorization (including any Governmental Authorization).

     Contract.  "Contract"  shall  mean any  written,  oral or other  agreement,
contract,  subcontract,   lease,  understanding,   instrument,  note,  warranty,
insurance policy,  benefit plan or legally binding  commitment or undertaking of
any nature.

                                       70
<PAGE>

     Damages.  "Damages"  shall  include any loss,  damage,  injury,  decline in
value, lost opportunity,  liability, claim, demand, settlement, judgment, award,
fine, penalty,  Tax, fee (including  reasonable  attorneys' fees),  charge, cost
(including costs of investigation) or expense of any nature.

     Disclosure Schedule.  "Disclosure  Schedule" shall mean the schedule (dated
as of the date of the Agreement) delivered to Castelle on behalf of Ibex and the
Designated Shareholders.

     Encumbrance.  "Encumbrance"  shall  mean any lien,  pledge,  hypothecation,
charge,  mortgage,   security  interest,   encumbrance,   claim,   infringement,
interference,  option,  right  of first  refusal,  preemptive  right,  community
property interest or restriction of any nature (including any restriction on the
voting of any security, any restriction on the transfer of any security or other
asset,  any restriction on the receipt of any income derived from any asset, any
restriction  on the use of any  asset  and any  restriction  on the  possession,
exercise or transfer of any other attribute of ownership of any asset).

     Entity.  "Entity"  shall mean any  corporation  (including  any  non-profit
corporation),   general  partnership,  limited  partnership,  limited  liability
partnership,  joint  venture,  estate,  trust,  company  (including  any limited
liability   company  or  joint  stock  company),   firm  or  other   enterprise,
association, organization or entity.

     Exchange  Act.  "Exchange  Act" shall mean the  Securities  Exchange Act of
1934, as amended.

     Government Bid. "Government Bid" shall mean any quotation,  bid or proposal
submitted  to  any  Governmental  Body  or  any  proposed  prime  contractor  or
higher-tier subcontractor of any Governmental Body.

     Government Contract.  "Government  Contract" shall mean any prime contract,
subcontract,  letter  contract,  purchase  order or delivery  order  executed or
submitted to or on behalf of any  Governmental  Body or any prime  contractor or
higher-tier  subcontractor,  or under  which any  Governmental  Body or any such
prime  contractor  or  subcontractor  otherwise  has or may acquire any right or
interest.

     Governmental  Authorization.  "Governmental  Authorization" shall mean any:
(a)   permit,   license,   certificate,    franchise,   permission,   clearance,
registration, qualification or authorization issued, granted, given or otherwise
made available by or under the authority of any Governmental Body or pursuant to
any Legal  Requirement;  or (b) right under any Contract  with any  Governmental
Body.

     Governmental Body.  "Governmental Body" shall mean any: (a) nation,  state,
commonwealth,  province,  territory,  county,  municipality,  district  or other
jurisdiction of any nature; (b) federal,  state,  local,  municipal,  foreign or
other  government;  or (c) governmental or  quasi-governmental  authority of any

                                       71
<PAGE>

nature (including any governmental  division,  department,  agency,  commission,
instrumentality,  official,  organization, unit, body or Entity and any court or
other tribunal).

     Indemnitees.  "Indemnitees" shall mean the following Persons: (a) Castelle;
(b) Castelle's current and future affiliates; (c) the respective Representatives
of the  Persons  referred  to in  clauses  "(a)"  and "(b)"  above;  and (d) the
respective  successors and assigns of the Persons  referred to in clauses "(a)",
"(b)" and "(c)" above; provided, however, that the Designated Shareholders shall
not be deemed to be "Indemnitees."

     Legal  Proceeding.   "Legal  Proceeding"  shall  mean  any  action,   suit,
litigation,    arbitration,   proceeding   (including   any   civil,   criminal,
administrative, investigative or appellate proceeding), hearing, inquiry, audit,
examination  or  investigation  commenced,  brought,  conducted  or  heard by or
before,  or otherwise  involving,  any court or other  Governmental  Body or any
arbitrator or arbitration panel.

     Legal  Requirement.  "Legal  Requirement"  shall mean any  federal,  state,
local,  municipal,  foreign or other law,  statute,  constitution,  principle of
common law, resolution, ordinance, code, edict, decree, rule, regulation, ruling
or requirement issued, enacted, adopted,  promulgated,  implemented or otherwise
put into effect by or under the authority of any Governmental Body.

     Material Adverse Effect. A violation or other matter will be deemed to have
a  "Material  Adverse  Effect"  on  Ibex  if  such  violation  or  other  matter
(considered together with all other matters that would constitute  exceptions to
the  representations  and  warranties  set  forth  in  the  Agreement  or in the
Designated  Shareholders'  Closing Certificate but for the presence of "Material
Adverse   Effect"  or  other   materiality   qualifications,   or  any   similar
qualifications,  in such  representations  and warranties) would have a material
adverse effect on Ibex's business,  condition, assets, liabilities,  operations,
financial performance or prospects.

     Person. "Person" shall mean any individual, Entity or Governmental Body.

     Proprietary Asset.  "Proprietary Asset" shall mean any: (a) patent,  patent
application,   trademark   (whether   registered  or  unregistered),   trademark
application,  trade  name,  fictitious  business  name,  service  mark  (whether
registered  or  unregistered),  service  mark  application,  copyright  (whether
registered  or  unregistered),   copyright   application,   maskwork,   maskwork
application,  trade secret, know-how, customer list, franchise, system, computer
software, computer program, invention,  design, blueprint,  engineering drawing,
proprietary  product,  technology,   proprietary  right  or  other  intellectual
property  right or intangible  asset;  or (b) right to use or exploit any of the
foregoing.

     Representatives.   "Representatives"   shall  mean   officers,   directors,
employees, agents, attorneys, accountants, advisors and representatives.

     SEC. "SEC" shall mean the United States Securities and Exchange Commission.

                                       72
<PAGE>

     Securities Act.  "Securities Act" shall mean the Securities Act of 1933, as
amended.

     Tax.  "Tax" shall mean any tax  (including  any income tax,  franchise tax,
capital gains tax, gross receipts tax,  value-added tax, surtax,  excise tax, ad
valorem tax, transfer tax, stamp tax, sales tax, use tax, property tax, business
tax, withholding tax or payroll tax), levy, assessment,  tariff, duty (including
any  customs  duty),  deficiency  or  fee,  and any  related  charge  or  amount
(including any fine, penalty or interest),  imposed, assessed or collected by or
under the authority of any Governmental Body.

     Tax Return.  "Tax Return" shall mean any return  (including any information
return),   report,   statement,   declaration,   estimate,   schedule,   notice,
notification, form, election, certificate or other document or information filed
with or  submitted  to,  or  required  to be filed  with or  submitted  to,  any
Governmental Body in connection with the determination,  assessment,  collection
or payment of any Tax or in connection with the  administration,  implementation
or enforcement of or compliance with any Legal Requirement relating to any Tax.

                                       73

<PAGE>


                                   EXHIBIT C-1

                           FORM OF AFFILIATE AGREEMENT

                                       74

<PAGE>


                               AFFILIATE AGREEMENT



     THIS AFFILIATE  AGREEMENT  ("Agreement") is being executed and delivered as
of August __, 1996, by the parties identified on Exhibit A (each, an "Affiliate"
and  collectively,  the  "Affiliates")  and CASTELLE,  a California  corporation
("Castelle").

                                    RECITALS

     A. The Affiliates are shareholders of IBEX TECHNOLOGIES, INC., a California
corporation (the "Company").

     B. Castelle,  the Company, the Affiliates and certain other shareholders of
the Company have entered into an Agreement and Plan of  Reorganization  dated as
of August 22, 1996 (the "Reorganization  Agreement") providing for the merger of
the Company with and into Castelle (the "Merger").  The Reorganization Agreement
contemplates  that, upon consummation of the Merger,  all outstanding  shares of
capital stock of the Company will be converted  into the right to receive shares
of  common  stock of  Castelle  ("Castelle  Common  Stock").  It is  accordingly
contemplated that the Affiliates will receive shares of Castelle Common Stock in
the Merger.

     C. Each  Affiliate  may be deemed to be an  "affiliate"  of the Company for
purposes of (i) the  restrictions  on resale imposed by  interpretations  of the
staff of the  Securities  and Exchange  Commission  (the "SEC") in  transactions
exempted from  registration  under the  Securities  Act of 1933, as amended (the
"Securities  Act"), and (ii) determining  Castelle's  eligibility to account for
the Merger as a "pooling of interests" under Accounting  Series Releases 130 and
135, as amended, of the SEC.

                                    AGREEMENT

     1.  Representations and Warranties.  The Affiliates severally represent and
warrant to Castelle as follows:

     (a) Each  Affiliate  is the  holder and  beneficial  owner of the number of
     shares of the Company's capital stock set forth under Affiliate's signature
     below (the "Shares"), and Affiliate has good and valid title to the Shares,
     free and clear of any liens, pledges,  security interests,  adverse claims,
     equities,  options, proxies,  charges,  encumbrances or restrictions of any
     nature.

     (b) Each  Affiliate has carefully  read this  Agreement,  and has discussed
     with counsel to the extent Affiliate felt necessary the limitations imposed
     on  Affiliate's  ability  to sell,  transfer  or  otherwise  dispose of the
     Shares, the shares of Castelle Common Stock that Affiliate is to receive in
     the Merger (the "Castelle Shares") and other shares of the capital stock of
     the Company or Castelle.  Affiliate fully  understands the limitations this

                                       75
<PAGE>

     Agreement  places upon Affiliate's  ability to sell,  transfer or otherwise
     dispose of the Shares,  and the Castelle Shares and other shares of capital
     stock of the Company or Castelle.

     (c) Each Affiliate  understands  that the  representations,  warranties and
     covenants  set forth herein will be relied upon by Castelle and its counsel
     and  accountants  for purposes of  determining  Castelle's  eligibility  to
     account  for the  Merger as a  "pooling  of  interests,"  for  purposes  of
     determining whether to proceed with the Merger and for other purposes.

     2. Prohibition Against Transfer. Each Affiliate agrees that:

     (a) until such time as the  Reorganization  Agreement is validly terminated
     in accordance with its terms,  such Affiliate  shall not sell,  transfer or
     otherwise  dispose of, or reduce  Affiliate's  interest in or risk relating
     to, (i) any  capital  stock of the  Company  (including  the Shares and any
     additional  shares of capital  stock of the Company  acquired by Affiliate,
     whether upon exercise of a stock option or  otherwise),  or (ii) any option
     to purchase any capital stock of the Company,  except  pursuant to and upon
     consummation of the Merger;

     (b)  during the  period  from the date on which the  Merger is  consummated
     through the date on which  financial  results  covering at least 30 days of
     post-Merger  combined  operations  of Castelle  and the  Company  have been
     published  by Castelle  (within the meaning of the  applicable  "pooling of
     interests" accounting requirements),  Affiliate shall not sell, transfer or
     otherwise  dispose of, or reduce  Affiliate's  interest in or risk relating
     to, (i) any shares of Castelle Common Stock (including the Castelle Shares)
     and any additional  shares of Castelle  Common Stock acquired by Affiliate,
     whether upon exercise of a stock option or otherwise, or (ii) any option to
     purchase shares of Castelle Common Stock; and

     (c) without  limiting the  generality  of the  foregoing,  or the effect of
     clause (b) of this Section 2, Affiliate shall not effect any sale, transfer
     or other disposition of the Castelle Shares unless:

          (i) such sale,  transfer or other  disposition  is made in  conformity
          with the  volume  and  other  requirements  of Rule  145(d)  under the
          Securities Act, as evidenced by a broker's letter and a representation
          letter executed by Affiliate, each stating that such requirements have
          been met;

          (ii) counsel  reasonably  satisfactory  to Castelle shall have advised
          Castelle in a written opinion letter upon which Castelle may rely that
          such  sale,   transfer  or  other  disposition  will  be  exempt  from
          registration under the Securities Act;

          (iii) such sale,  transfer or other  disposition  has been  registered
          under the Securities Act; or

          (iv) an  authorized  representative  of the SEC  shall  have  rendered
          written  advice to  Affiliate to the effect that the SEC would take no

                                       76
<PAGE>

          action,  or that the staff of the SEC would not recommend that the SEC
          take action,  with respect to such  proposed  sale,  transfer or other
          disposition,  and a copy of such written  advice and all other related
          communications with the SEC shall have been delivered to Castelle.

     For  purposes  of Section  2(c)(ii),  counsel  reasonably  satisfactory  to
Castelle shall include, in the case of sales, transfers or other dispositions by
Tucha Limited,  Newark  Holding S.A. and Teodoro Ramos Gimenez,  the law firm of
Morse, Barnes-Brown & Pendleton, P.C., presently in Waltham, Massachusetts.

     3. Stop Transfer Instructions.

     (a) Each Affiliate  acknowledges and agrees that stop transfer instructions
     will be given to  Castelle's  transfer  agent with  respect to the Castelle
     Shares and with respect to any shares of Castelle  Common Stock acquired by
     Affiliate  upon any  exercise of any option to purchase  shares of Castelle
     Common  Stock,   and  that  there  will  be  placed  on  the   certificates
     representing  such shares of  Castelle  Common  Stock or any  substitutions
     thereof a legend, stating in substance:

        THE SHARES REPRESENTED BY THIS CERTIFICATE ARE RESTRICTED AND MAY
        ONLY BE TRANSFERRED IN ACCORDANCE WITH THE TERMS OF AN AGREEMENT
        DATED AS OF AUGUST __, 1996, BETWEEN THE REGISTERED HOLDER HEREOF
            AND CASTELLE, A COPY OF WHICH AGREEMENT IS ON FILE AT THE
                         PRINCIPAL OFFICES OF CASTELLE."

     (b) Castelle agrees that such stop transfer  instructions  and legends will
     be removed with respect to shares of Castelle  Common Stock at such time as
     Castelle is reasonably satisfied that the restrictions on resale imposed by
     interpretations  of the staff of the Commission are no longer applicable to
     such shares.

     4. Specific  Performance.  Affiliate agrees that irreparable  damages would
occur  in the  event  that  any of the  provisions  of this  Agreement  were not
performed in accordance with their specific  terms, or were otherwise  breached.
It is, accordingly,  agreed that Castelle shall be entitled to injunctive relief
to  prevent  breaches  of the  provisions  of  this  Agreement,  and to  enforce
specifically the terms and provisions hereof, in addition to any other remedy to
which Castelle may be entitled at law or in equity.

     5. Notices.  Any notice or other communication  required or permitted to be
delivered to Castelle or Affiliate  under this Agreement shall be in writing and
shall be deemed properly delivered,  given and received when delivered (by hand,
by registered  mail, by courier or express  delivery service or by facsimile) to
the address or  facsimile  telephone  number set forth  beneath the name of such
party  below (or to such other  address or  facsimile  telephone  number as such
party shall have specified in a written notice given to the other party):

                                       77
<PAGE>


               if to Castelle:             CASTELLE

                                           3255-3 Scott Boulevard
                                           Santa Clara, California 95054
                                           Attn:  President
                                           Facsimile: (408) 654-4699

               if to Affiliate:            ______________________________

                                           ------------------------------

                                           ------------------------------

                                           ------------------------------

     6. Severability.  In the event that any provision of this Agreement, or the
application of any such provision to any person, entity or set of circumstances,
shall be  determined  to be  invalid,  unlawful,  void or  unenforceable  to any
extent,  the remainder of this Agreement,  and the application of such provision
to  persons,  entities  or  circumstances  other  than  those  as to which it is
determined to be invalid, unlawful, void or unenforceable, shall not be impaired
or otherwise  affected  and shall  continue to be valid and  enforceable  to the
fullest extent permitted by law.

     7. Governing Law. This Agreement shall be construed in accordance with, and
governed in all respects by, the laws of the State of California (without giving
effect to principles of conflicts of laws).

     8.  Waiver.  No failure on the part of Castelle or an Affiliate to exercise
any power, right, privilege or remedy under this Agreement,  and no delay on the
part of Castelle in exercising any power, right,  privilege or remedy under this
Agreement,  shall operate as a waiver of such power, right, privilege or remedy;
and no single or partial exercise of any such power, right,  privilege or remedy
shall  preclude  any other or further  exercise  thereof or of any other  power,
right, privilege or remedy. Neither Castelle nor an Affiliate shall be deemed to
have  waived any claim  arising  out of this  Agreement,  or any  power,  right,
privilege  or remedy  under this  Agreement,  unless  the waiver of such  claim,
power, right, privilege or remedy is expressly set forth in a written instrument
duly executed and delivered on behalf of Castelle; and any such waiver shall not
be applicable or have any effect except in the specific  instance in which it is
given.

     9. Captions.  The captions  contained in this Agreement are for convenience
of reference only,  shall not be deemed to be a part of this Agreement and shall
not be referred to in connection with the construction or interpretation of this
Agreement.

     10.  Further  Assurances.  Affiliate  shall  execute  and/or  cause  to  be
delivered to Castelle such  instruments  and other documents and shall take such
other actions as Castelle may  reasonably  request to effectuate  the intent and
purposes of this Agreement.

                                       78
<PAGE>

     11. Entire Agreement.  This Agreement, the Reorganization Agreement and the
other  agreements  referred  to in the  Reorganization  Agreement  set forth the
entire  understanding  of Affiliate and Castelle  relating to the subject matter
hereof and thereof and supersede all prior agreements and understandings between
Affiliate and Castelle relating to the subject matter hereof and thereof.

     12. Amendments.  This Agreement may not be amended,  modified,  altered, or
supplemented  other  than by means of a written  instrument  duly  executed  and
delivered on behalf of Castelle and Affiliate.

     13.  Binding  Nature.  This  Agreement  will be binding upon  Affiliate and
Affiliate's   representatives,   executors,   administrators,   estate,   heirs,
successors  and  assigns,  and  shall  inure  to the  benefit  of  Castelle  and
Affiliates and their successors and assigns.

     14.  Attorneys'  Fees and  Expenses.  If any legal  action  or other  legal
proceeding  relating to the  enforcement  of any provision of this  Agreement is
brought against either Castelle or an Affiliate,  the prevailing  party shall be
entitled to recover  reasonable  attorneys'  fees, costs and  disbursements  (in
addition to any other relief to which the prevailing party may be entitled).

     15.  Termination.  This  Agreement  shall  terminate  and be of no force or
effect if the Reorganization  Agreement is validly terminated in accordance with
its terms without the Merger having occurred.  The representations,  warranties,
covenants and other  provisions  contained in this  Agreement  shall survive the
Merger.



CASTELLE:                                 AFFILIATE:




______________________________            _____________________________
        (Signature)                                   [name]



                                          Stock Beneficially Owned by Affiliate:
______________________________
        (Print Name)                      _____ shares of Common Stock

                                          _____ shares of Preferred Stock
______________________________
        (Print Title)

                                       79
<PAGE>


                                    EXHIBIT A

                                   AFFILIATES



Tucha Limited

Newark Holding S.A.

Teodoro Ramos Gimenez

Ney Grant and Betsy Gray-Grant

Clovis Mattos

Curtis Powell

                                       80

<PAGE>


                                   EXHIBIT C-2

                     PERSONS TO EXECUTE AFFILIATE AGREEMENTS


Ney Grant and Betsy Gray-Grant

Clovis Mattos

Teodoro Ramos Gimenez

Curtis Powell

Newark Holdings S.A.

Tucha Limited

                                       81

<PAGE>


                                    EXHIBIT D

                       FORM OF TAX REPRESENTATION LETTERS

                                       82

<PAGE>






____________, 1996





Cooley Godward Castro Huddleson & Tatum           Graham & James LLP
One Maritime Plaza, 20th Floor                    400 Capitol Mall, 24th Floor
San Francisco, California 94111                   Sacramento, California  95814


Re: Merger pursuant to that certain  Agreement and Plan of  Reorganization  (the
"Agreement")  dated  August 22, 1996 by and among  Castelle  ("Castelle"),  Ibex
Technology, Inc. ("Ibex") and the Signing Shareholders

Ladies and Gentlemen:

This letter is supplied to you in  connection  with your  rendering  of opinions
regarding  certain United States federal income tax  consequences of the Merger.
Unless  otherwise  indicated,  capitalized  terms not  defined  herein  have the
meanings set forth in the Agreement.

Representations

The  undersigned  officer of Ibex,  a California  corporation,  on behalf of the
management of Ibex, after  consulting with legal counsel and financial  auditors
regarding the meaning of and factual support for the following  representations,
hereby represents,  in connection with the proposed merger of Ibex, a California
corporation,  with  and into  Castelle  in a  statutory  merger  (the  "Merger")
pursuant to the Agreement and Exhibits thereto  including but not limited to the
Agreement of Merger, that as of the time this letter is executed,  the following
facts are true and will continue to be true as of the Effective Time and Closing
of the Merger and thereafter where relevant:



     1. Ibex's principal  reasons for  participating in the Merger are bona fide
business reasons.

     2. The total fair market  value of all  consideration  other than  Castelle
voting  common stock  received by Ibex  shareholders  in exchange for their Ibex
common and preferred stock in the Merger (including,  without  limitation,  cash
paid to Ibex shareholders perfecting dissenters' rights and cash paid in lieu of
fractional  shares) will be less than ten percent  (10%) of the  aggregate  fair
market value of Ibex common and preferred stock outstanding immediately prior to
the Merger.

     3. The liabilities of Ibex assumed by Castelle and the liabilities to which
the transferred assets of Ibex are subject were incurred by Ibex in the ordinary
course of its business.

                                       83
<PAGE>

     4. The fair market value of Ibex's assets on the  Effective  Date which are
transferred  to Castelle will exceed the aggregate  liabilities of Ibex plus the
amount of liabilities,  if any, to which such assets are subject,  and the total
adjusted  basis of the  assets of Ibex  transferred  to  Castelle  will equal or
exceed  the sum of the  liabilities  assumed  by  Castelle,  plus the  amount of
liabilities, if any, to which the transferred assets are subject.

     5.  Ibex is not  and  will  not be on the  Effective  Date  an  "investment
company" within the meaning of ss.  368(a)(2)(F) of the Internal Revenue Code of
1986, as amended, (the "Code").

     6. Ibex has no  knowledge  of any plan or intention on the part of any Ibex
shareholder (a "Plan") to engage in a sale,  exchange,  transfer,  distribution,
pledge,  disposition or any other  transaction which would result in a direct or
indirect  disposition (a "Sale") of shares of Castelle voting common stock to be
issued to Ibex shareholders in the Merger,  which shares would have an aggregate
fair  market  value,  as of the  Effective  Date of the  Merger,  in  excess  of
fifty-percent (50%) of the aggregate fair market value, immediately prior to the
Merger,  of all  outstanding  shares of Ibex  common and  preferred  stock.  For
purposes of this  representation,  shares of Ibex common and preferred stock (or
the  portion  thereof)  (i) with  respect to which a Ibex  shareholder  receives
consideration in the Merger other than Castelle voting common stock  (including,
without limitation, cash received pursuant to the exercise of dissenters' rights
or paid in lieu of issuing  fractional shares) and/or (ii) with respect to which
a sale  occurs  during the  Pre-Merger  Period,  shall be  considered  shares of
outstanding Ibex common and preferred stock exchanged for Castelle voting common
stock in the Merger and then disposed of pursuant to a Plan.

     7. The  payment of cash by Castelle in lieu  issuing  fractional  shares of
Castelle  voting  common stock is solely for the purpose of avoiding the expense
and  inconvenience  to  Castelle  of  issuing  fractional  shares  and  does not
represent separately bargained for consideration.  The Castelle fractional share
interests to which each Ibex  shareholder  may be entitled in the Merger will be
aggregated  so that no Ibex  shareholder  will  receive  cash in an amount which
would  equal or  exceed,  in the  aggregate,  the  value of one  whole  share of
Castelle voting common stock.

     8.  Except  with  respect  to (1)  payments  of cash  to Ibex  shareholders
perfecting  dissenters'  rights,  and (2) payments of cash in lieu of fractional
shares of Castelle voting common and preferred stock, one hundred percent (100%)
of the Ibex common and  preferred  stock  outstanding  immediately  prior to the

                                       84
<PAGE>

Merger will be exchanged solely for Castelle voting common stock.  Thus,  except
as set forth in the preceding  sentence,  Ibex intends that no  consideration be
paid or received (directly or indirectly,  actually or constructively)  for Ibex
common and preferred stock other than Castelle voting common stock.

     9. During the Pre-Merger  Period,  no indebtedness  or other  obligation of
Ibex has been or will be guaranteed by any shareholder of Ibex (or any person or
entity related to a shareholder of Ibex).

     10. On the  Effective  Date of the  Merger,  the fair  market  value of the
Castelle  voting  common  stock and other  consideration  received  by each Ibex
shareholder  will be  approximately  equal to the aggregate fair market value of
the Ibex common and preferred stock surrendered in exchange therefor.

     11. Ibex and the shareholders of Ibex will each pay separately its or their
own expenses in connection  with the Merger as  contemplated  by the  Agreement;
provided,  however,  that to the extent any expenses  relating to the Merger (or
the "plan of  reorganization"  within the meaning of Treas.  Reg. ss. 1.368-1(c)
with respect to the Merger) are funded  directly or  indirectly by a party other
than  the  incurring  party,   such  expenses  will  be  within  the  guidelines
established in Rev. Rul. 73-54, 1973-1 C.B. 187.

     12. There is no intercorporate  indebtedness  existing between Castelle and
Ibex that was issued,  acquired,  or will be settled at a  discount,  and to the
best knowledge of the management of Ibex, Castelle will assume no liabilities of
any Ibex shareholder in connection with the Merger.

     13.  The terms of the  Agreement  and all  other  agreements  entered  into
pursuant thereto are the product of arm's length negotiations.

     14. None of the compensation  payments  received by any shareholder of Ibex
will be separate consideration for, or allocable to, any of their shares of Ibex
common or preferred  stock.  None of the shares of Castelle  voting common stock
received  by any  shareholder  of Ibex will be  separate  consideration  for, or
allocable to, any employment agreement,  consulting agreement, any covenants not
to compete or otherwise for the  performance of services;  and the  compensation
paid to any shareholder of Ibex will be for services  actually rendered and will
be  commensurate  with amounts paid to third parties  bargaining at arm's length
for similar services.

     15. Ibex is authorized to make all of the representations set forth herein.

                                       85

<PAGE>






                                     GENERAL

                       YOUR RELIANCE IN RENDERING OPINIONS
                          LIMITATIONS ON YOUR OPINIONS


     1. The undersigned recognize that (i) your opinions will be based on, among
other things,  the  representations  and  statements  set forth  herein,  in the
Agreement  (including  exhibits attached thereto),  and in the documents related
thereto,  and  (ii)  your  opinions  will be  subject  to  certain  limitations,
qualifications  and  assumptions  including  that the opinions may not be relied
upon if any such  representations or statements are not accurate in all material
respects.

     2. The  undersigned  recognize  that your opinions will not address any tax
consequences of the Merger or any action taken in connection therewith except as
expressly set forth in such opinions.

                                Very truly yours,

                                                  IBEX TECHNOLOGY, INC.
                                                  a California Corporation


                                                  By:

                                                  Title:

                                       86

<PAGE>





                              ______________, 1996





Cooley Godward Castro Huddleson & Tatum         Graham & James LLP
One Maritime Plaza                              400 Capitol Mall, 24th Floor
20th Floor                                      Sacramento, California  95814
San Francisco, CA  94111


Re:      Merger  Transaction (the "Merger")  Pursuant to that certain  Agreement
         and Plan of Reorganization  (the "Agreement")  Dated  August 22,   1996
         by and among Castelle  ("Castelle"),  Ibex Technologies,  Inc. ("Ibex")
         and the Signing Shareholders

Ladies and Gentlemen:

     This letter is  supplied to you in  connection  with your  rendering  of an
opinion  regarding  certain United States federal income tax consequences of the
Merger.  Unless otherwise  indicated,  capitalized terms not defined herein have
the meanings set forth in the Agreement.

Representations

     The undersigned officer of Castelle, a California corporation, on behalf of
the management of Castelle,  after  consulting  with legal counsel and financial
auditors  regarding  the  meaning of and the factual  support for the  following
representations,  hereby  represents,  in connection with the proposed merger of
Ibex, a California  corporation,  with and into  Castelle in a statutory  merger
(the "Merger")  pursuant to the Agreement and Exhibits thereto including but not
limited to the Agreement of Merger,  with Castelle surviving the Merger, that as
of the time  this  letter is  executed,  the  following  facts are true and will
continue  to be true as of the  Effective  Time and  Closing  of the  Merger and
thereafter where relevant:

     1. Castelle's  principal  reasons for  participating in the Merger are bona
fide business reasons.

     2.  Castelle has no plan or intention to reacquire  any of its stock issued
in the Merger.

     3. Castelle has no plan or intention to sell or otherwise dispose of any of
the assets of Ibex acquired in the Merger,  except for dispositions  made in the

                                       87
<PAGE>

ordinary  course of business or transfers  described in section  368(a)(2)(C) of
the Internal Revenue Code of 1986, as amended (the "Code").

     4. Following the Merger,  Castelle will continue  Ibex's  historic trade or
business  or use a  significant  portion of its  historic  business  assets in a
business.

     5. Castelle is not, and will not be on the Effective  Date, an  "investment
company" within the meaning of section 368(a)(2)(F) of the Code.

     6. No  shareholder  of Ibex is acting as agent for  Castelle in  connection
with the Merger or approval  thereof,  and Castelle  will not reimburse any Ibex
shareholder for Ibex common stock or preferred  stock such  shareholder may have
purchased or for other obligations such shareholder may have incurred.

     7. The payment of cash by Castelle in lieu of issuing  fractional shares of
Castelle  voting  common stock is solely for the purpose of avoiding the expense
and  inconvenience  to  Castelle  of  issuing  fractional  shares  and  does not
represent separately bargained for consideration.  The Castelle fractional share
interests to which each Ibex  shareholder  may be entitled in the Merger will be
aggregated  so that no Ibex  shareholder  will  receive  cash in an amount which
would  equal or  exceed,  in the  aggregate,  the  value of one  whole  share of
Castelle voting common stock.

     8.  Except  with  respect  to (1)  payments  of cash  to Ibex  shareholders
perfecting  dissenters' or appraisal  rights and (2) payments of cash in lieu of
fractional  shares of Castelle  voting  common  stock or  preferred  stock,  one
hundred percent (100%) of the Ibex common stock and preferred stock  outstanding
immediately  prior to the Merger will be exchanged  solely for  Castelle  voting
common  stock.  Thus,  except as set forth in the preceding  sentence,  Castelle
intends  that no  consideration  be paid or received  (directly  or  indirectly,
actually or constructively)  for Ibex common stock or preferred stock other than
Castelle voting common stock.

     9. The total fair market  value of all  consideration  other than  Castelle
voting  common stock  received by Ibex  shareholders  in exchange for their Ibex
common stock or preferred stock in the Merger  (including,  without  limitation,
cash paid to Ibex  shareholders  perfecting  dissenters' or appraisal rights and
cash paid in lieu of  fractional  shares) will be less than ten percent (10%) of
the  aggregate  fair  market  value of Ibex  common  stock and  preferred  stock
outstanding  immediately  prior to the  Merger.  In  addition,  the  total  cash

                                       88
<PAGE>

consideration  that will be paid in the Merger to Ibex  shareholders  in lieu of
fractional  shares of Castelle  voting  common stock will not exceed one percent
(1%) of the total  consideration  that will be issued in the  Merger to the Ibex
shareholders  in exchange for their  shares of Ibex common  stock and  preferred
stock.

     10. On the  Effective  Date of the  Merger,  the fair  market  value of the
Castelle  voting  common  stock and other  consideration  received  by each Ibex
shareholder  will be  approximately  equal to the aggregate fair market value of
the Ibex common stock and preferred stock surrendered in exchange therefor.

     11.  Castelle will pay separately  its own expenses in connection  with the
Merger as contemplated by the Agreement;  provided,  however, that to the extent
any expenses relating to the Merger (or the "plan of reorganization"  within the
meaning of Treas.  Reg.  ss.  1.368-1(c)  with respect to the Merger) are funded
directly or indirectly by a party other than the incurring party,  such expenses
will be within the guidelines established in Rev. Rul. 73-54, 1973-1 C.B. 187.

     12. There is no intercorporate  indebtedness  existing between Castelle and
Ibex that was issued,  acquired, or will be settled at a discount,  and Castelle
will not assume any  liabilities of Ibex's  shareholders  in connection with the
Merger.

     13.  The terms of the  Agreement  and all  other  agreements  entered  into
pursuant thereto are the product of arm's-length negotiations.

     14.  None of the  compensation  payments  which  might be  received  by any
shareholder of Ibex will be separate  consideration for, or allocable to, any of
their  shares of Ibex common  stock or  preferred  stock;  none of the shares of
Castelle  voting common stock to be received by any  shareholder of Ibex will be
separate   consideration  for,  or  allocable  to,  any  employment   agreement,
consulting  agreement,  any  covenants  not to  compete  or  otherwise  for  the
performance  of  services;  and  the  compensation  which  might  be paid to any
shareholder  of  Ibex  will  be for  services  actually  rendered  and  will  be
commensurate  with amounts paid to third parties  bargaining at arm's length for
similar services.

     15.  Castelle  is  authorized  to make all the  representations  set  forth
herein.

                                     GENERAL

        Your Reliance In Rendering Opinions; Limitations On Your Opinions

     1. The  undersigned  recognizes  that (i) your  opinions  will be based on,
among other things, the  representations and statements set forth herein, in the
Agreement  (including  exhibits attached thereto),  and in the documents related

                                       89
<PAGE>

thereto,  and  (ii)  your  opinions  will be  subject  to  certain  limitations,
qualification and assumptions including that the opinions may not be relied upon
if any such  representations  or  statements  are not  accurate in all  material
respects.

     2. The  undersigned  recognizes that your opinions will not address any tax
consequences of the Merger or any action taken in connection therewith except as
expressly set forth in such opinions.

                                Very truly yours,

                                                  CASTELLE,
                                                  a California corporation

                                                  By:

                                                  Title:


                                       90
<PAGE>






                                    EXHIBIT E

                   FORM OF CONTINUITY OF INTEREST CERTIFICATE

                                       91

<PAGE>


                       CONTINUITY OF INTEREST CERTIFICATE



     The  undersigned  is  aware  that  pursuant  to an  Agreement  and  Plan of
Reorganization,  dated as of August 22, 1996 (the  "Reorganization  Agreement"),
made  and  entered  into  by  and  among  CASTELLE,  a  California   corporation
("Castelle") and IBEX TECHNOLOGIES, INC., a California corporation ("Ibex"), and
certain  shareholders of Ibex, it is contemplated  that Ibex will merge with and
into  Castelle in a  transaction  (the  "Merger")  in which shares of the common
stock of Ibex ("Ibex Common Stock") and preferred  stock of Ibex ("Ibex Prefered
Stock") will be exchanged for shares of the common stock of Castelle  ("Castelle
Common Stock")

     1. The undersigned represents, warrants and certifies as follows:

     (a) The  undersigned  currently  is the owner of that  number  and class of
     shares of Ibex Common Stock and Ibex  Preferred  Stock set forth below (the
     "Shares")  and did not  acquire any of the Shares in  contemplation  of the
     Merger;

     (b) The  undersigned  has not engaged in a Sale (as  defined  below) of any
     shares of Ibex Common Stock or Ibex Preferred Stock in contemplation of the
     Merger;

     (c) The undersigned has, and will as of the Effective Date have, no plan or
     intention (a "Plan") to engage in a sale, exchange, transfer,  distribution
     (including  a  distribution  by a  partnership  to  its  partners  or  by a
     corporation to its stockholders), redemption or reduction in any way of the
     undersigned's  risk of  ownership  (by short sale or  otherwise),  or other
     disposition,  directly  or  indirectly  (such  actions  being  collectively
     referred to herein as a "Sale") of the shares of Castelle  Common  Stock to
     be received by the undersigned in the Merger. For purposes of the preceding
     sentence, shares of Ibex Common Stock or shares of Ibex Preferred Stock (or
     the portion thereof) (i) with respect to which the undersigned will receive
     consideration  in the Merger  other than  shares of Castelle  Common  Stock
     (including  cash to be  received in lieu of  fractional  shares of Castelle
     Common  Stock)  and/or  (ii) with  respect to which a Sale (A)  occurred in
     contemplation of the Merger or (B) will occur prior to the Merger, shall be
     considered  shares of Ibex Common Stock or shares of Ibex  Preferred  Stock
     exchanged  for  shares of  Castelle  Common  Stock in the  Merger  and then
     disposed of pursuant to a Plan;

     (d)  The  undersigned  has  no  Plan  to  exercise  dissenters'  rights  in
     connection with the Merger;

     (e) The undersigned is not aware of, or  participating  in, any Plan on the
     part of the  holders  of  shares  of Ibex  Common  Stock or  shares of Ibex
     Preferred  Stock to  engage in a Sale or Sales of the  shares  of  Castelle
     Common  Stock to be  received in the Merger  such that the  aggregate  fair
     market value,  as of the Effective  Time (as defined in the  Reorganization
     Agreement),  of shares  subject to such Sales would  exceed  fifty  percent
     (50%) of the aggregate fair market value of all shares of outstanding  Ibex
     Common Stock and Ibex Preferred Stock immediately prior to the Merger.  For
     purposes of the  preceding  sentence,  shares of Ibex Common  Stock (or the

                                       92
<PAGE>

     portion  thereof) (i) with respect to which a shareholder  of Ibex receives
     consideration  in the Merger  other than  shares of Castelle  Common  Stock
     (including,  without limitation,  cash received pursuant to the exercise of
     dissenters'  rights or in lieu of a  fractional  share of  Castelle  Common
     Stock)  or (ii)  with  respect  to  which  a Sale  occurs  prior  to and in
     contemplation of the Merger, shall be considered shares of outstanding Ibex
     Common  Stock or Ibex  Preferred  Stock  exchanged  for shares of  Castelle
     Common Stock in the Merger and then disposed of pursuant to a Plan;

     (f) The  undersigned  waives  any and all  rights to seek  damages or other
     relief from Castelle or Ibex as a result of any losses incurred as a result
     of the  inaccuracy  of any or all of the  representations  set forth in the
     certificate  dated  August  __,  1996 from Ibex to  Cooley  Godward  Castro
     Huddleson  & Tatum and Graham & James  LLP,  provided  pursuant  to Section
     5.8(b) of the Reorganization Agreement.

     (g) Except to the extent written  notification  to the contrary is received
     by Ibex from the undersigned prior to the Merger, the  representations  and
     warranties and certifications contained herein shall be true and correct at
     all times from the date hereof through the date on which the Merger occurs.

     2. The undersigned  has consulted with such legal and financial  counsel as
the undersigned has deemed  appropriate in connection with the execution of this
Certificate.

     3. The undersigned  understands  that Castelle,  Ibex, and their respective
shareholders,  as well as legal counsel to Castelle and Ibex (in connection with
rendering of their  opinions that the Merger will be a  "reorganization"  within
the meaning of Section 368(a) of the Internal  Revenue Code of 1986, as amended)
will be relying on (a) the truth and accuracy of the  representations  contained
herein  and (b) the  undersigned's  performance  of the  obligations  set  forth
herein.

     IN WITNESS  WHEREOF,  the  undersigned  has executed  this  Certificate  on
_____________________, 1996.

                                   Signature:

                                   Name:

                                   Address:





Number of Shares of Ibex Common Stock Beneficially Owned:

Number of Shares of Ibex Preferred Stock Beneficially Owned:

                                       93

<PAGE>


                                    EXHIBIT F

                                 PERSONS TO SIGN
                    EMPLOYMENT AND NONCOMPETITION AGREEMENTS


Ney Grant

Curtis Powell

Clovis Mattos

Bryan Roe (no noncompetition agreement)

Fabio Matsui (no noncompetition agreement)

                                       94

<PAGE>


                                    EXHIBIT G

                          FORM OF EMPLOYMENT AGREEMENT

                                       95

<PAGE>


                              EMPLOYMENT AGREEMENT



        THIS  EMPLOYMENT  AGREEMENT  ("Agreement")  is being  entered into as of
August __, 1996 (the  "Closing  Date") by and  between  CASTELLE,  a  California
corporation (the "Corporation"), and ____________________ ("Employee").

                                    RECITALS

     A. Pursuant to an Agreement and Plan of Merger and Reorganization, dated as
of August 22, 1996, by and among the  Corporation,  Ibex  Technologies,  Inc., a
California  corporation  ("Ibex"),  and certain shareholders of Ibex, as amended
(the  "Reorganization  Agreement"),  Ibex is merging into the Corporation on the
Closing Date (the "Merger").  As a result of the Merger,  Ibex  shareholders are
receiving shares of Common Stock of the Corporation in exchange for their shares
of stock of Ibex.

     B.  Employee was a  shareholder  of Ibex prior to the Merger,  and has been
serving as an employee of Ibex.

     C. The  Corporation  has  required,  as a  condition  to  consummating  the
transactions contemplated by the Reorganization Agreement, that Employee execute
and deliver this Agreement.

     D.  Contemporaneously  with the execution  and delivery of this  Agreement,
Employee  is  executing  and  delivering  to the  Corporation  a  Noncompetition
Agreement   of  even  date   herewith.   The   Reorganization   Agreement,   the
Noncompetition  Agreement and the Proprietary  Information  Agreement previously
executed  by  Employee in favor of Ibex are  referred  to  collectively  in this
Agreement as the "Other Agreements."

                                    AGREEMENT

     In  order  to  induce  the  Corporation  to  consummate  the   transactions
contemplated by the Reorganization  Agreement,  and in further  consideration of
the mutual  covenants  and  agreements  contained  herein,  the parties agree as
follows:

1. EMPLOYMENT

     1.1 Term; Duties.

     (a) Term.  Subject to Section  1.7  below,  Employee  agrees to serve as an
     employee of the  Corporation  during the period  commencing  on the Closing
     Date  and  ending  on the  date  two  years  from  the  Closing  Date  (the
     "Employment Term").

                                       96
<PAGE>

     (b)  Duties.  During the  Employment  Term,  Employee  shall  serve in such
     capacity as the  Corporation's  Chairman may specify from time to time, and
     shall  have  such  responsibilities  as  may  be  assigned  to  him  by the
     Corporation's Chairman. Employee agrees to serve the Corporation faithfully
     and to the best of his  ability,  and to  devote  substantially  all of his
     working  time,  attention  and efforts  during the  Employment  Term to the
     business and affairs of the Corporation.  Employee  represents and warrants
     to the Corporation that he is under no contractual commitments inconsistent
     with his obligations set forth in this Agreement.

     1.2 Salary.  In consideration of all services to be rendered by Employee to
the  Corporation  during  the  Employment  Term,  the  Corporation  shall pay to
Employee  a salary of  $__________  per  annum,  payable  at such times as other
salaried  employees of the  Corporation  receive their regular salary  payments.
Employee's  salary may be  increased  by the  Corporation  as a result of salary
reviews to be conducted by Castelle's Chief Executive Officer periodically.  The
Corporation  shall be entitled to withhold  from the salary  payments  otherwise
required to be made to Employee such amounts as the  Corporation may be required
to withhold under applicable tax laws and other applicable legal requirements.

     1.3 Stay-On Bonus  Payments.  Subject to Section  1.7(b),  the  Corporation
shall pay to Employee, as a stay-on bonus,  $__________ per month on each of the
first 12 monthly anniversaries of the Closing Date.

     1.4 Other Benefits.  The Corporation shall provide to Employee,  during the
Employment  Term,  the  same  benefits  that  the  Corporation  makes  generally
available to all of its other employees during the Employment  Term,  subject to
Employee's  satisfaction  of the respective  eligibility  requirements  for such
benefits.

     1.5 Other Compensation  Matters.  Employee  acknowledges and agrees that he
shall not be entitled to receive from the  Corporation,  or from Castelle or any
other affiliate of the Corporation,  any salary,  bonus or other compensation or
benefit of any nature (whether  relating to any period prior to the Closing Date
or relating to any period after the Closing  Date) except as expressly  provided
in the  Other  Agreements  or in  Sections  1.2,  1.3  and 1.4  above.  Employee
represents and warrants to the Corporation that he is not aware of any claims or
rights  against the  Corporation  arising  directly or indirectly  from his past
employment with the Corporation, and Employee hereby releases and discharges the
Corporation  and its  affiliates  from all  claims,  rights,  causes of  action,
demands and obligations  relating to or arising  directly or indirectly from his
past employment with the Corporation.

     1.6  Expenses.  Employee  shall  be  entitled  to  reimbursement  from  the
Corporation for reasonable  out-of-pocket  business expenses reasonably incurred
by Employee during the Employment  Term in the performance of Employee's  duties
under this  Agreement;  provided,  however,  that the  Corporation  shall not be
required to  reimburse  Employee  for any such  expenses  unless:  (a)  Employee
presents  vouchers and receipts  indicating in reasonable  detail the amount and
business purpose of each of such expenses;  and (b) Employee  otherwise complies
with the Corporation's  reimbursement policies established from time to time and
in effect during the Employment Term.

                                       97
<PAGE>

     1.7 Termination.

     (a)  Either  the  Corporation  or the  Employee  shall  have  the  right to
     terminate this Agreement,  with or without Cause (as defined in Section 1.8
     below), at any time during the Employment Term by delivering written notice
     of termination to the other.  Upon the termination of this Agreement during
     the Employment  Term,  Employee's  employment  with the  Corporation  shall
     terminate and, except as provided in Section 1.7(b) below,  the Corporation
     shall have no further monetary obligation or other obligation of any nature
     to Employee  under this  Agreement or with respect to his employment or the
     termination of his employment.

     (b) If (i) the  Corporation  terminates  this  Agreement  without Cause (as
     defined in Section 1.8 below)  during the  Employment  Term,  (ii) Employee
     satisfies  all of  his  obligations  relating  to  the  termination  of his
     employment  under this Agreement  (including his obligations  under Section
     3.2 below),  and (iii) Employee  executes and delivers to the Corporation a
     general  release of liability  (satisfactory  in form and  substance to the
     Corporation) in favor of the Corporation, then so long as Employee does not
     breach  Section  2 below or any of the  material  provisions  of the  Other
     Agreements,  Employee  shall be  entitled to continue to receive the salary
     specified in Section 1.2 above for the remainder of the Employment Term and
     the stay-on bonus payments specified in Section 1.3.

     (c) The  termination  of this  Agreement  pursuant  to this  Section 1.7 or
     otherwise shall not limit or otherwise affect any of Employee's obligations
     under Section 2 or Section 3.2 below or under any of the Other  Agreements,
     all of which shall remain in full force and effect.

     1.8 Definition of "Cause." Employee's employment with the Corporation shall
be deemed to have been  terminated for "Cause" if such  employment is terminated
following:  (a) any  intentional  misconduct,  fraud or bad faith on the part of
Employee in the performance of his duties as an employee of the Corporation; (b)
the  conviction  of Employee of, or the entry by Employee of a plea of guilty or
no contest to, any felony;  (c) the breach by Employee of any material provision
in any of the Other Agreements; (d) the continued failure of Employee to perform
any  reasonable  duties  assigned to him, if such breach or failure is not fully
cured by  Employee  within ten days  after he  receives  written  notice of such
failure;  or (e) the inability of Employee to perform any of his material duties
as a result of illness or injury,  if Employee  remains  unable to perform  such
duties for a total of ten consecutive weeks.

2. CONFIDENTIAL INFORMATION

     2.1 Proprietary Information Agreement.  Employee acknowledges that Employee
has previously executed a Proprietary Information Agreement in favor of Ibex and
agrees to continue to abide by the  provisions of such agreement both during and
after the Employment Term as provided therein.

                                       98
<PAGE>

     2.2  Obligation  to  Keep   Confidential.   Employee  agrees  to  keep  all
Confidential  Information  (as  defined  in  Section  2.3  below)  strictly  and
permanently confidential and, accordingly,  agrees that he shall not at any time
(whether during or after the Employment Term) directly or indirectly use for any
purpose,  or disclose  or permit to be  disclosed  to any person or entity,  any
Confidential   Information.   Employee   acknowledges   that  the   Confidential
Information  constitutes  unique and valuable assets of Ibex and the Corporation
acquired  at great time and  expense by Ibex and the  Corporation,  and that any
disclosure  or other use of such  Confidential  Information,  other than for the
sole  benefit of Ibex and the  Corporation,  would be  wrongful  and would cause
irreparable harm to the Corporation.

     2.3  Definition  of  "Confidential  Information."  The  term  "Confidential
Information"  means any non-public  information  (whether or not in written form
and whether or not expressly  designated as confidential)  relating  directly or
indirectly  to the  Corporation,  Ibex  or any of  the  Corporation's  or  Ibex'
subsidiaries  or other  affiliates  or  relating  to the  business,  operations,
financial affairs,  performance,  assets,  investments,  technology,  processes,
products, contracts, customers, licensees,  sublicensees,  suppliers, personnel,
plans or prospects of the  Corporation  or Ibex or any of the  Corporation's  or
Ibex subsidiaries or other affiliates, including any such information consisting
of or otherwise  relating  directly or  indirectly to trade  secrets,  know-how,
technology,  designs, drawings,  processes,  license or sublicense arrangements,
formulae,  proposals,  customer lists or  preferences,  pricing lists,  referral
sources,  marketing or sales techniques or plans,  operations  manuals,  service
manuals, financial information,  projections, lists of suppliers or distributors
or sources of supply; provided,  however, that "Confidential  Information" shall
not be deemed to include information which, at the time of initial disclosure to
Employee,  is part  of,  or  without  violation  of this  Agreement  or fault of
Employee becomes part of, the public knowledge or literature.

3. MISCELLANEOUS PROVISIONS

     3.1 Other  Agreements.  Nothing in this Agreement shall limit Employee's or
the  Corporation's  obligations  or the rights and  remedies  of Employee or the
Corporation  under  the  Other  Agreements,  and  nothing  in any  of the  Other
Agreements shall limit Employee's or the Corporation's obligations or the rights
and remedies of the Employee or the Corporation under this Agreement.

     3.2 Surrender of Records and  Property.  At such time as Employee no longer
serves as an employee of the Corporation, Employee shall deliver promptly to the
Corporation (a) all records,  manuals, books, blank forms,  documents,  letters,
memoranda,  notes,  notebooks,  reports,  data,  tables,  calculations or copies
thereof in his  possession  or under his control  which are the  property of the
Corporation,  and (b) all other  property and  Confidential  Information  of the
Corporation  or Castelle in his  possession or under his control,  including all
documents  which contain any  Confidential  Information  of the  Corporation  or
Castelle.

                                       99
<PAGE>

     3.3 Notices. Any notice or other communication  required or permitted to be
delivered to either party under this Agreement  shall be in writing and shall be
deemed  properly  delivered,  given and received  when  delivered  (by hand,  by
registered  mail, by courier or express delivery service or by facsimile) to the
address or facsimile  telephone  number set forth beneath the name of such party
below (or to such other  address  or  facsimile  telephone  number as such party
shall have specified in a written notice given to the other party hereto):

               If to the Corporation:             CASTELLE

                                                  3255-3 Scott Boulevard
                                                  Santa Clara, CA  95054
                                                  Attention:    President
                                                  Facsimile:    (408) 654-4699

               If to Employee:





     3.4 Severability. In the event that any provision of this Agreement, or the
application of any such provision to any person, entity or set of circumstances,
shall be  determined  to be  invalid,  unlawful,  void or  unenforceable  to any
extent,  the remainder of this Agreement,  and the application of such provision
to  persons,  entities  or  circumstances  other  than  those  as to which it is
determined to be invalid, unlawful, void or unenforceable, shall not be impaired
or otherwise  affected  and shall  continue to be valid and  enforceable  to the
fullest extent permitted by law.

     3.5 Governing  Law. This Agreement  shall be construed in accordance  with,
and governed in all respects  by, the laws of the State of  California  (without
giving effect to principles of conflicts of laws).

     3.6 Waiver.  No failure on the part of either  party to exercise any power,
right,  privilege  or remedy under this  Agreement,  and no delay on the part of
either  party in  exercising  any power,  right,  privilege or remedy under this
Agreement,  shall operate as a waiver of such power, right, privilege or remedy;
and no single or partial exercise of any such power, right,  privilege or remedy
shall  preclude  any other or further  exercise  thereof or of any other  power,
right,  privilege  or remedy.  Neither  party shall be deemed to have waived any
claim arising out of this Agreement,  or any power,  right,  privilege or remedy
under this Agreement,  unless the waiver of such claim, power, right,  privilege
or remedy is  expressly  set forth in a written  instrument  duly  executed  and
delivered on behalf of such party;  and any such waiver shall not be  applicable
or have any effect except in the specific instance in which it is given.

     3.7 Captions.  The captions contained in this Agreement are for convenience
of reference only,  shall not be deemed to be a part of this Agreement and shall
not be referred to in connection with the construction or interpretation of this
Agreement.

                                      100
<PAGE>

     3.8 Counterparts.  This Agreement may be executed in several  counterparts,
each of  which  shall  constitute  an  original  and all of  which,  when  taken
together, shall constitute one agreement.

     3.9 Further Assurances.  Each party hereto shall execute and/or cause to be
delivered to the other party hereto such  instruments  and other  documents  and
shall take such other  actions as such  other  party may  reasonably  request to
effectuate the intent and purposes of this Agreement.

     3.10 Entire  Agreement.  This Agreement and the Other  Agreements set forth
the entire  understanding  of the parties  relating to the subject matter hereof
and thereof and supersede all prior  agreements and  understandings  between the
parties relating to the subject matter hereof and thereof.

     3.11 Amendments.  This Agreement may not be amended,  modified,  altered or
supplemented  other  than by means of a written  instrument  duly  executed  and
delivered on behalf of the Corporation and Employee.

     3.12 Assignment.  This Agreement and all rights and obligations of Employee
hereunder  are  personal to Employee and may not be  transferred  or assigned by
Employee at any time.  The  Corporation  may, with  Employee's  written  consent
(which consent shall not be unreasonably withheld), assign its rights under this
Agreement to any entity that assumes the Corporation's  obligations hereunder in
connection  with any sale or  transfer  of all or a  substantial  portion of the
Corporation's assets to such entity.

     3.13 Binding Nature.  Subject to Section 3.12 above, this Agreement will be
binding upon and inure to the benefit of the  Corporation and its successors and
assigns and Employee and his representatives, executors, administrators, estate,
heirs, successors and assigns.

     3.14  Attorneys'  Fees and  Expenses.  If any legal  action or other  legal
proceeding  relating to the  enforcement  of any provision of this  Agreement is
brought against either party hereto,  the prevailing  party shall be entitled to
recover reasonable  attorneys' fees, costs and disbursements (in addition to any
other relief to which the prevailing party may be entitled).

                                      101

<PAGE>


     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
executed and delivered as of the date first above written.

                                  CASTELLE

                                  By:

                                  Its:




                                      102


<PAGE>


                                    EXHIBIT H

                        FORM OF NONCOMPETITION AGREEMENT
                            NONCOMPETITION AGREEMENT

                                      103
<PAGE>


                            NONCOMPETITION AGREEMENT


     THIS NONCOMPETITION AGREEMENT ("Agreement") is being executed and delivered
as of August __, 1996 (the "Closing Date"), by _____________  ("Shareholder") in
favor of and for the benefit of CASTELLE, a California corporation ("Company").

                                    RECITALS

     A. As an employee  and major  shareholder  of Ibex  Technologies,  Inc.,  a
California corporation ("Ibex"), Shareholder has obtained extensive and valuable
knowledge  and   information   concerning   the  business  of  Ibex   (including
confidential information relating to Ibex and its operations, assets, contracts,
customers, personnel, plans and prospects).

     B. Pursuant to an Agreement and Plan of Merger and Reorganization  dated as
of August 22, 1996,  by and among the  Company,  Ibex,  Shareholder  and certain
other  shareholders  of the Company (the  "Reorganization  Agreement"),  Ibex is
merging into the Company on the Closing Date (the "Merger").  In connection with
the Merger,  Shareholder and the Company's other shareholders are exchanging all
of their shares of stock of Ibex for shares of Common Stock of the Company.

     C.  Concurrently  with this  Agreement,  Shareholder  has  entered  into an
Employment  Agreement  with  Company  with a term of two years (the  "Employment
Agreement").

     D. In connection with the Merger (and as a condition to the consummation of
the  Merger),  and to more fully  secure unto the  Company  the  benefits of the
Merger,  the Company has required that Shareholder enter into this Agreement and
Shareholder  is entering  into this  Agreement in order to induce the Company to
consummate the Merger.

     E. The Company has conducted and is conducting  its business on a worldwide
basis.

                                    AGREEMENT

     In order to induce the Company to consummate the transactions  contemplated
by the  Reorganization  Agreement,  and in  consideration  of the  issuance  and
delivery to Shareholder of shares of Common Stock of the Company pursuant to the
Reorganization Agreement, Shareholder agrees as follows:

     1.  Acknowledgments  by  Shareholder.  Shareholder  acknowledges  that  the
promises  and  restrictive  covenants  he is  providing  in this  Agreement  are
reasonable  and  necessary  for  the  Company's  protection  of  its  legitimate
interests in its acquisition of Ibex pursuant to the  Reorganization  Agreement,
including  but not limited to Ibex's  goodwill.  Shareholder  acknowledges  that
Shareholder  is  exchanging  all of  Shareholder's  shares  of stock of Ibex for
shares of Common Stock of the Company in the Merger.

                                      104
<PAGE>

     2.  Noncompetition.  During the period  commencing  on the Closing Date and
continuing  until  the date  __________  (__)  years  after the  termination  of
Employee's  employment with the Company (the "Noncompete  Period"),  Shareholder
shall  not,  directly  or  indirectly,  provide  any  service  (as an  employee,
consultant or otherwise),  support  (including  financial  support),  product or
technology  to any  person or  entity,  if such  service,  support,  product  or
technology involves or relates to, in any material respect, (A) the provision of
"information  on  demand"  products,  including  but  not  limited  to  products
delivering  information via facsimile,  voice, video or any Internet mechanisms,
(B)  "electronic  commerce," (C) the use of the Internet for effecting  economic
transactions,  (D) the provision of  information  or products over the Internet,
(E) the design,  development,  coding or  creation  of software  for use with or
otherwise  involving  the  Internet  including,  but not limited to, the design,
development  or coding of software for the purpose of  gathering,  collecting or
analyzing  market  data,  customer  data or web  site  visits  (hits)  over  the
Internet, or (F) the design,  development or coding of management software tools
utilized with  "information on demand" products or to enhance the  functionality
of  network  facsimile  products  (each,  a  "Restricted  Business");  provided,
however, that nothing in this Section 2 shall prevent Shareholder from providing
services, support, products or technology to any person or entity while employed
by the Company,  so long as Shareholder  is providing  such  services,  support,
products and technology  solely in Shareholder's  capacity as, and solely in the
course of discharging  Shareholder's duties and responsibilities as, an employee
of the Company.

     3.  Nonsolicitation.  Shareholder further agrees that during the Noncompete
Period, Shareholder will not:

     (a)  directly  or  indirectly,  personally  or through  others,  encourage,
     induce,  attempt to induce, solicit or attempt to solicit (on Shareholder's
     own behalf or on behalf of any other  person or entity) any employee of the
     Company,  or  any  of  the  Company's  subsidiaries  to  leave  his  or her
     employment with the Company, or any or of the Company's subsidiaries;

     (b)  employ,  or permit any entity  over which  Shareholder  exercises  any
     control,  to employ such employee who has  terminated his or her employment
     with the Company or any of the Company's subsidiaries during the Noncompete
     Period; or

     (c)  directly  or  indirectly,  personally  or  through  others,  approach,
     contact,  solicit,  advise  or do (or  attempt  to do)  business  with,  or
     otherwise  interfere  with the  relationship  of the  Company or any of the
     Company's  subsidiaries  with,  any  person  or  entity  who is,  was or is
     reasonably anticipated to become a customer or client of the Company or any
     of the Company's subsidiaries with respect to any Restricted Business.

     4. Consideration.  As consideration for this Noncompetition  Agreement, the
     Company shall pay  Shareholder  $_______.  Such  payments  shall be made to

                                      105
<PAGE>

     Shareholder in three (3) $____  installments with the first installment due
     on the date of this Agreement and the second and third  installments due on
     the first and second monthly anniversaries of the date of this Agreement.

     5.  Termination.  Shareholder's  obligations  under  Sections  2 and 3, and
     Company's  obligations  under  Section 4 shall  terminate if  Shareholder's
     employment with Company pursuant to the Employment  Agreement is terminated
     without Cause (as such term is defined in the Employment Agreement).

     6.  Independence of Obligations.  The covenants of Shareholder set forth in
     this Agreement  shall be construed as independent of any other agreement or
     arrangement  between  Shareholder,  on the one hand, and the Company on the
     other. The existence of any claim or cause of action by Shareholder against
     the  Company  shall not  constitute  a defense to the  enforcement  of such
     covenants against Shareholder.

     7. Specific Performance. Shareholder agrees that in the event of any breach
     or threatened  breach by Shareholder  of any covenant,  obligation or other
     provision  contained in this  Agreement,  the Company shall be entitled (in
     addition to any other remedy that may be available to them) to (a) a decree
     or order of specific  performance or mandamus to enforce the observance and
     performance of such  covenant,  obligation or other  provision,  and (b) an
     injunction restraining such breach or threatened breach.

     8.  Non-Exclusivity.  The rights and remedies of the Company  hereunder are
     not  exclusive  of or limited  by any other  rights or  remedies  which the
     Company may have, whether at law, in equity, by contract or otherwise,  all
     of which shall be cumulative (and not  alternative).  Without  limiting the
     generality  of the  foregoing,  the  rights  and  remedies  of the  Company
     hereunder,  and the obligations  and liabilities of Shareholder  hereunder,
     are in addition  to their  respective  rights,  remedies,  obligations  and
     liabilities under the law of unfair competition,  misappropriation of trade
     secrets and the like. This Agreement does not limit, and is not limited by,
     the terms of the Employment  Agreement or the terms of any other  agreement
     between Shareholder and the Company or any affiliate of the Company.

     9. Notices.  Any notice or other communication  required or permitted to be
     delivered to Shareholder  or the Company under this  Agreement  shall be in
     writing and shall be deemed  properly  delivered,  given and received  when
     delivered  (by hand, by  registered  mail,  by courier or express  delivery
     service or by facsimile) to the address or facsimile  telephone  number set
     forth  beneath  the name of such party  below (or to such other  address or
     facsimile  telephone number as such party shall have specified in a written
     notice given to the other party hereto):

               If to the Company:   CASTELLE

                                    3255-3 Scott Boulevard
                                    Santa Clara, CA  95054
                                    Attention:    President
                                    Facsimile:    (408) 654-4699

                                      106
<PAGE>

               If to Shareholder:





     10.  Severability.  If any  provision of this  Agreement or any part of any
such provision is held under any circumstances to be invalid or unenforceable in
any jurisdiction, then (a) such provision or part thereof shall, with respect to
such  circumstances  and in such  jurisdiction,  be deemed amended to conform to
applicable  laws so as to be  valid  and  enforceable  to the  fullest  possible
extent, (b) the invalidity or unenforceability of such provision or part thereof
under such  circumstances and in such jurisdiction shall not affect the validity
or   enforceability   of  such   provision  or  part  thereof  under  any  other
circumstances  or  in  any  other  jurisdiction,  and  (c)  such  invalidity  of
enforceability  of such  provision or part thereof shall not affect the validity
or  enforceability  of the  remainder  of  such  provision  or the  validity  or
enforceability of any other provision of this Agreement.  Each provision of this
Agreement is separable from every other  provision of this  Agreement,  and each
part of each  provision of this  Agreement is separable from every other part of
such provision.

     11.  Governing Law. This Agreement  shall be construed in accordance  with,
and governed in all respects  by, the laws of the State of  California  (without
giving effect to principles of conflicts of laws).

     12.  Waiver.  No failure on the part of the Company to exercise  any power,
right, privilege or remedy under this Agreement, and no delay on the part of the
Company  in  exercising  any  power,  right,  privilege  or  remedy  under  this
Agreement,  shall operate as a waiver of such power, right, privilege or remedy;
and no single or partial exercise of any such power, right,  privilege or remedy
shall  preclude  any other or further  exercise  thereof or of any other  power,
right,  privilege or remedy.  The Company shall not be deemed to have waived any
claim arising out of this Agreement,  or any power,  right,  privilege or remedy
under this Agreement,  unless the waiver of such claim, power, right,  privilege
or remedy is  expressly  set forth in a written  instrument  duly  executed  and
delivered on behalf of such party;  and any such waiver shall not be  applicable
or have any effect except in the specific instance in which it is given.

     13. Captions.  The captions contained in this Agreement are for convenience
of reference only,  shall not be deemed to be a part of this Agreement and shall
not be referred to in connection with the construction or interpretation of this
Agreement.

     14.  Further  Assurances.  Shareholder  shall  execute  and/or  cause to be
delivered to the Company such  instruments  and other  documents  and shall take
such other actions as Company may  reasonably  request to effectuate  the intent
and purposes of this Agreement.

                                      107
<PAGE>

     15. Entire Agreement.  This Agreement and the Employment Agreement (and the
other agreements  referred to in the Employment  Agreement) set forth the entire
understanding  of  Shareholder  and the Company  relating to the subject  matter
hereof and thereof and supersede all prior agreements and understandings between
any of such parties relating to the subject matter hereof and thereof.

     16. Amendments.  This Agreement may not be amended,  modified,  altered, or
supplemented  other  than by means of a written  instrument  duly  executed  and
delivered on behalf of the Company and Shareholder.

     17. Assignment.  This Agreement and all obligations  hereunder are personal
to  Shareholder  and may not be  transferred  or assigned by  Shareholder at any
time. The Company may, with  Shareholder's  written consent (which consent shall
not be  unreasonably  withheld),  assign its rights under this  Agreement to any
entity in connection  with any sale or transfer of all or a substantial  portion
of the Company's assets to such entity.

     18. Binding  Nature.  Subject to Section 17, this Agreement will be binding
upon Shareholder and Shareholder's representatives,  executors,  administrators,
estate,  heirs,  successors  and  assigns,  and will inure to the benefit of the
Company and its respective successors and assigns.

     19.  Attorneys'  Fees and  Expenses.  If any legal  action  or other  legal
proceeding  relating to the  enforcement  of any provision of this  Agreement is
brought against  Shareholder,  the prevailing party shall be entitled to recover
reasonable  attorneys' fees, costs and  disbursements  (in addition to any other
relief to which the prevailing party may be entitled).

                                      108

<PAGE>


     IN WITNESS  WHEREOF,  the undersigned has executed this Agreement as of the
date first above written.


                                      109

<PAGE>


                                    EXHIBIT I

                   FORM OF LEGAL OPINION OF GRAHAM & JAMES LLP

                                      110

<PAGE>


                       [GRAHAM & JAMES LLP OPINION LETTER]

                       
Castelle
3255-3 Scott Boulevard
Santa Clara, CA  95054

Ladies and Gentlemen:

We have  acted as  legal  counsel  for Ibex  Technologies,  Inc.,  a  California
corporation (the  "Company"),  in connection with the merger of the Company with
and  into  Castelle,  a  California  corporation  ("Castelle")  pursuant  to  an
Agreement  and  Plan  of  Reorganization  dated  as  of  August  22,  1996  (the
"Reorganization  Agreement") by and among the Company,  Castelle and the Signing
Shareholders listed on Exhibits A-1 and A-2 of the Agreement (the "Merger").  We
are rendering this opinion  pursuant to Section 6.6(i) of the Agreement.  Except
as otherwise defined herein,  capitalized terms used but not defined herein have
the respective meanings given to them in the Agreement.

In  rendering  this  opinions  expressed  below,  we  have  examined  originals,
certified  copies or copies  otherwise  identified to us as being true copies of
the originals of the following documents:

     (a) The Agreement.

     (b) The Merger Agreement.

Items (a) and (b) are hereafter collectively referred to as the "Agreements".

We  have  also  considered  such  questions  of  law  and  examined  such  other
instruments, records, certificates, opinions, memoranda and documents as we have
deemed  necessary or advisable for the purpose of preparing this opinion letter.
As to questions of fact material to this opinion letter, we have relied upon the
certificates  of  officers  of  the  Company.  We  have  undertaken  no  further
investigation  in  connection  with this  opinion  letter  except  for only such
factual inquiries as we deemed  appropriate with respect to the facts underlying
such certificates and the Agreements.

                                      111

<PAGE>


Castelle
______________, 1996
 



In rendering this opinion, we have assumed the following:

     (i) The  representations  and  warranties in the  Agreements  and any other
     certificates,  instruments  or agreements  executed in connection  with the
     Agreements or delivered to us are true, correct and not misleading;

     (ii) The  signatures on all original  documents  examined by us are genuine
     and all copies of such documents submitted to us are genuine;

     (iii) The due authorization, execution and delivery of all documents (other
     than  the  Company  where  authorization,  execution  and  delivery  are  a
     prerequisite to the effectiveness thereof);

     (iv) All  individuals  executing  and  delivering  documents  had the legal
     capacity to so execute and deliver;

     (v) Each party to the Agreements, other than the Company is duly organized,
     validly   existing  and  in  good  standing  under  its   jurisdiction   of
     organization and is in good standing as a foreign  corporation in each such
     jurisdiction  in which the  conduct of its  business  or its  ownership  or
     leasing  of  property  currently  requires  that it  qualify  as a  foreign
     corporation,  with the corporate or other  organizational  power to perform
     its  obligations  under the  Agreements  to which it is a party,  each such
     party has complied with any applicable  requirement to file tax returns and
     pay taxes in each  jurisdiction in which it is required to do so, each such
     party has validly authorized, executed and delivered each of the Agreements
     to which it is a party and the Agreements  constitute the valid and binding
     obligations  of each such  party,  enforceable  against  each such party in
     accordance with their terms;

     (vi) The  factual  matters set forth in the  Agreements  are  accurate  and
     complete  in all  material  respects  and all  certificates  and all  other
     written  representations  as to factual matters  delivered or made to us by
     officers  of the  Company or the  Signing  Shareholders  are  accurate  and
     complete in all material respects;

     (vii) There are no agreements, written or oral, among any of the parties to
     any of the Agreements that modify,  waive, amend or affect the terms of any
     of the Agreements;

     (viii) Neither the execution of the Agreements nor the  consummation of the
     transactions  provided for therein  contravenes  any  applicable law of any
     jurisdiction, other than California law or federal law.


                                       112

<PAGE>


Castelle
______________, 1996
 


     The opinions hereinafter  expressed are subject to the following additional
qualifications:

     (a) The  attorneys in our firm who have  prepared this opinion are admitted
     to practice law only in the States of California, and we express no opinion
     herein  concerning  any law other than the law of the States of  California
     and the federal law of the United States.

     (b) To the  extent any  opinion  is  rendered  herein  with  respect to the
     enforceability of any agreement: (1) we express no opinion as to the effect
     on  such   enforceability  of  applicable   federal  or  state  bankruptcy,
     insolvency,  reorganization,  moratorium  or other  similar laws  generally
     affecting  relief of debtors or the enforcement of the rights of creditors;
     (2) we express no opinion as to the effect on such  enforceability  of laws
     governing specific performance,  injunctive relief, fraudulent sales and/or
     conveyances,   preferences   or   other   equitable   remedies;   (3)   the
     enforceability  of  obligations  in the  Agreements  is  subject to general
     principles  of  equity   regardless  of  whether  such   enforceability  is
     considered  in a  proceeding  in equity or law, and a court  applying  such
     principles  may  refuse to  enforce,  or may limit  the  application  of, a
     contract or any clause  thereof;  and (4)  enforcement  of  indemnification
     provisions contained in the Agreements may be limited by applicable law.

     (c) We express no opinion  herein as to compliance or  non-compliance  with
     federal  or state  securities  laws,  including  but not  limited  to,  the
     antifraud  provisions  of any  state or  federal  securities  law,  rule or
     regulation.

     (d) We have acted as counsel to the Company  and the  Signing  Shareholders
     only with respect to certain  corporate  matters,  the  negotiation  of the
     Agreements  and the rendering of these  opinions.  Accordingly,  we may not
     have knowledge of all matters of fact or law relating to the Company or the
     Signing  Shareholders  that may be relevant in connection with the opinions
     herein.  Any  alteration of those facts may adversely  affect our opinions.
     Whenever a statement  herein is qualified by "known to us," "to our current
     actual  knowledge,"  or similar  phrase,  it is intended  to indicate  that
     during the course of our representation of the Company, no information that
     would give us current actual  knowledge of the inaccuracy of such statement
     has come to the attention of those attorneys in this firm who have rendered
     legal  services to the  Company.  However,  except as  otherwise  expressly
     indicated,  we  have  not  undertaken  any  independent   investigation  to
     determine  the  accuracy  of  any  such   statement   (including,   without
     limitation, any search of litigation filings in any court), and any limited
     inquiry  undertaken by us during the  preparation of this letter should not
     be regarded as such an investigation. No inference as to our current actual
     knowledge  of any matters  bearing on the  accuracy  of any such  statement
     should be drawn from the fact of our representation of the Company.

                                      113

<PAGE>


Castelle
______________, 1996
 



     (e) With regard to our opinion in paragraph 4 below,  we have  examined and
     relied upon a  certificate  executed by an officer of the  Company,  to the
     effect that the consideration  for all outstanding  shares of capital stock
     of the  Company  was  received  by  the  Company  in  accordance  with  the
     provisions of the applicable Board of Directors resolutions and any plan or
     agreement  relating to the issuance of such shares,  and we have undertaken
     no independent verification with respect thereto.

     (f) With  regard to our  opinion  in  paragraph  5 below  with  respect  to
     material defaults under any material  agreement known to us, we have relied
     solely upon (i) inquiries of officers of the Company,  (ii) a list supplied
     to us by the Company,  a copy of which has been  supplied to your  counsel,
     Cooley Godward Castro  Huddleson & Tatum,  of material  agreements to which
     the Company is a party,  or by which it is bound,  and (iii) an examination
     of  the  items  on  the  aforementioned  list;  we  have  made  no  further
     investigation.

On the  basis of the  foregoing,  in  reliance  thereon  and with the  foregoing
qualifications, we are of the opinion that:

     1. The  Company  has  been  duly  incorporated  and is a  validly  existing
     corporation in good standing under the laws of the State of California.

     2. The  Company  has the  requisite  corporate  power  to own or lease  its
     property and assets and to conduct its  business as it is  currently  being
     conducted  and, to the best of our  knowledge,  is  qualified  as a foreign
     corporation to do business and is in good standing in each  jurisdiction in
     the United  States in which the ownership of its property or the conduct of
     its business  requires such  qualification and where any statutory fines or
     penalties or any  corporate  disability  imposed for the failure to qualify
     would  materially and adversely affect the Company,  its assets,  financial
     condition or operations.

     3. The  Agreements  have been duly and  validly  authorized,  executed  and
     delivered by the Company and constitute valid and binding agreements of the
     Company and the Signing  Shareholders  enforceable  against the Company and
     the respective Signing Shareholders in accordance with their terms.

     4. The  Company's  authorized  capital  stock  consists  of (a) ten million
     (10,000,000)  shares of  Common  Stock,  without  par  value,  of which one
     hundred  forty-one   thousand  sixteen  (141,016)  shares  are  issued  and
     outstanding,  and (b) five million  (5,000,000)  shares of Preferred Stock,
     without  par value,  of which  forty-eight  thousand  thirty-five  (48,035)
     shares have been designated Series A Preferred Stock, without par value, of
     which all such shares are issued and outstanding. The outstanding shares of
     Common Stock and of Preferred Stock have been authorized and validly issued

                                       114

<PAGE>


Castelle
______________, 1996
 


     and  are  fully  paid  and  nonassessable.   The  rights,  preferences  and
     privileges of the Series A Preferred Stock are as stated in the Certificate
     of Determination of Preferences of Series A Preferred Stock. To the best of
     our  knowledge,  there are no  options,  warrants,  conversion  privileges,
     preemptive rights or other rights presently  outstanding to purchase any of
     the  authorized but unissued  capital stock of the Company,  other than the
     conversion  privileges of the Series A Preferred  Stock,  rights created in
     connection with the transactions  contemplated by the Agreements and twenty
     thousand  (20,000)  shares  reserved for issuance  under the Company's 1992
     Stock Option Plan, of which  fourteen  thousand  seven  hundred  thirty-one
     (14,731) shares are subject to outstanding options.

     5. The  execution  and  delivery  of the  Agreements  by the Company do not
     violate any provision of the Company's Articles of Incorporation or Bylaws,
     and do not  constitute  a  material  default  under the  provisions  of any
     material  agreement known to us to which the Company is a party or by which
     it is bound, and do not violate or contravene (a) any governmental statute,
     rule or  regulation  applicable  to the  Company  or (b) any  order,  writ,
     judgment, injunction, decree, determination or award which has been entered
     against  the  Company  and  of  which  we  are  aware,   the  violation  or
     contravention  of which would  materially and adversely affect the Company,
     its assets, financial condition or operations.

     6.  To the  best  of our  knowledge,  there  is no  action,  proceeding  or
     investigation  pending or overtly threatened against the Company before any
     court  or  administrative   agency  that  questions  the  validity  of  the
     Agreements or might result, either individually or in the aggregate, in any
     material adverse change in the assets,  financial condition,  or operations
     of the Company.

     7. All  consents,  approvals,  authorizations,  or orders of, and  filings,
     registrations,   and  qualifications  with  any  regulatory   authority  or
     governmental body in the United States required for the consummation by the
     Company  and,  to  our  knowledge,   the  Signing   Shareholders,   of  the
     transactions contemplated by the Agreements, have been made or obtained.


                                      115
 

<PAGE>


Castelle
______________, 1996
 

This opinion is intended solely for your use in connection with the transactions
contemplated by the Agreements and is not to be made available to or relied upon
by other persons or entities without our prior written  consent.  Our opinion is
expressly  limited  to the  matters  set forth  above and we render no  opinion,
whether by  implication  or otherwise,  as to any other matters  relating to the
Company or the  Signing  Shareholders.  Our  opinion is  rendered as of the date
hereof,  and we assume no  obligation  to  advise  you of facts,  circumstances,
events or developments which hereafter may be brought to our attention and which
may alter, affect or modify the opinions expressed herein.

Very truly yours,

Graham & James LLP

                                      116

<PAGE>


                                  EXHIBIT J

                            FORM OF LEGAL OPINION OF
                     COOLEY GODWARD CASTRO HUDDLESON & TATUM


                                      117

<PAGE>



                         [COOLEY GODWARD OPINION LETTER]



____________, 1996

To the Ibex Shareholders
listed on Schedule A hereto

Dear Sir or Madam:

We have acted as counsel for Castelle, a California corporation (the "Company"),
in connection with the merger of Ibex Technologies,  Inc. ("Ibex") with and into
the Company  pursuant to an  Agreement  and Plan of  Reorganization  dated as of
August 22, 1996 (the "Reorganization  Agreement") by and among the Company, Ibex
and the Signing Shareholders listed on Exhibit A-1 and A-2 of the Reorganization
Agreement  (the  "Merger)  and the  issuance  and sale of [eight  hundred  fifty
thousand (850,000)] shares of Castelle Common Stock (the "Shares") in connection
with the Merger. We are rendering this opinion pursuant to Section 6.6(i) of the
Reorganization Agreement.  Except as otherwise defined herein, capitalized terms
used but not defined  herein have the  respective  meanings given to them in the
Reorganization Agreement.

In  connection  with  this  opinion,  we  have  examined  and  relied  upon  the
representations  and  warranties  as to factual  matters  contained  in and made
pursuant to the Reorganization Agreement by the various parties and originals or
copies certified to our satisfaction, of such records, documents,  certificates,
opinions,  memoranda and other  instruments  as in our judgment are necessary or
appropriate to enable us to render the opinion expressed below.  Where we render
an opinion "to the best of our knowledge" or concerning an item "known to us" or
our opinion  otherwise  refers to our knowledge,  it is based solely upon (i) an
inquiry  of  attorneys  within  this firm who  perform  legal  services  for the
Company,  (ii)  receipt of a  certificate  executed by an officer of the Company
covering  such  matters,  and (iii) such other  investigation,  if any,  that we
specifically set forth herein.

In rendering this opinion, we have assumed:  the genuineness and authenticity of
all  signatures  on  original  documents;  the  authenticity  of  all  documents
submitted to us as  originals;  the  conformity  to  originals of all  documents
submitted  to us as copies;  the  accuracy,  completeness  and  authenticity  of
certificates  of public  officials;  and the due  authorization,  execution  and
delivery of all documents (except the due authorization,  execution and delivery
by the  Company  of the  Reorganization  Agreement  and  the  exhibits  thereto,
including the Merger Agreement and the Disclosure  Schedule,  (collectively  the
"Agreements"), where authorization,  execution and delivery are prerequisites to
the effectiveness of such documents.  We have also assumed: that all individuals
executing  and  delivering  documents  had the legal  capacity to so execute and
deliver;  that you have  received all  documents  you were to receive  under the
Agreements;  that the Agreements are obligations  binding upon you; if you are a
corporation  or other  entity,  that  you have  filed  any  required  California

                                      118
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franchise or income tax returns and have paid any required California  franchise
or income taxes;  and that there are no extrinsic  agreements or  understandings
among the parties to the Agreements  that would modify or interpret the terms of
the  Agreements  or  the  respective   rights  or  obligations  of  the  parties
thereunder.

Our opinion is  expressed  only with  respect to the federal  laws of the United
States of America and the laws of the State of California. We express no opinion
as to whether the laws of any particular  jurisdiction  apply, and no opinion to
the extent that the laws of any  jurisdiction  other than those identified above
are applicable to the subject matter hereof. We are not rendering any opinion as
to compliance with any antifraud law, rule or regulation.

With  regard to our  opinion  in  paragraph  4 below with  respect  to  material
defaults  under any material  agreement  known to us, we have relied solely upon
(i)  inquiries  of officers of the  Company,  (ii) a list  supplied to us by the
Company, a copy of which has been supplied to your counsel,  Graham & James LLP,
of material agreements to which the Company is a party, or by which it is bound,
and (iii) an examination of the items on the  aforementioned  list; we have made
no further investigation.

On the  basis of the  foregoing,  in  reliance  thereon  and with the  foregoing
qualifications, we are of the opinion that:

     1. The  Company  has  been  duly  incorporated  and is a  validly  existing
corporation in good standing under the laws of the State of California.

     2. The  Agreements  have been duly and  validly  authorized,  executed  and
delivered  by the Company and  constitute  valid and binding  agreements  of the
Company  enforceable  against the Company in accordance with their terms, except
as rights to indemnity  under section 9 of the  Reorganization  Agreement may be
limited  by  applicable  laws  and  except  as  enforcement  may be  limited  by
applicable bankruptcy, insolvency,  reorganization,  arrangement,  moratorium or
other similar laws affecting  creditors'  rights,  and subject to general equity
principles and to limitations on  availability  of equitable  relief,  including
specific performance.

     3.  The  Shares,   when  issued  in  accordance   with  the  terms  of  the
Reorganization  Agreement,  will be duly authorized,  validly issued, fully paid
and non-assessable.

     4. The  execution and delivery of the  Agreements  by the Company  pursuant
thereto do not violate  any  provision  of the  Company's  Amended and  Restated
Articles of  Incorporation  or Bylaws,  and do not constitute a material default
under the provisions of any material  agreement known to us to which the Company
is a party or by which it is bound,  and do not  violate or  contravene  (a) any

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governmental  statute,  rule or regulation  applicable to the Company or (b) any
order, writ, judgment, injunction, decree, determination or award which has been
entered  against  the  Company  and of  which we are  aware,  the  violation  or
contravention of which would  materially and adversely  affect the Company,  its
assets, financial condition or operations.

     5.  To the  best  of our  knowledge,  there  is no  action,  proceeding  or
investigation pending or overtly threatened against the Company before any court
or administrative  agency that questions the validity of the Agreements or might
result, either individually or in the aggregate,  in any material adverse change
in the assets, financial condition, or operations of the Company.

     All  consents,  approvals,  authorizations,  or  orders  of,  and  filings,
registrations,  and qualifications with any regulatory authority or governmental
body in the United States  required for the  consummation  by the Company of the
transactions contemplated by the Agreements, have been made or obtained.

     Registration  #33-__________ (the "Registration  Statement") filed pursuant
to the Securities  Act of 1933, as amended (the  "Securities  Act"),  has become
effective,  and,  to the best of our  knowledge,  no stop order  suspending  the
effectiveness  of  the  Registration  Statement  or  preventing  the  use of the
associated  Prospectus/Proxy  Statement has been issued and no  proceedings  for
that purpose have been instituted or are pending or threatened by the Securities
and Exchange Commission.

     The Registration  Statement and the Prospectus/Proxy  Statement (except for
the  financial  statements  and  schedules,   other  financial  information  and
statistical data which are included therein and information  concerning Ibex, as
to which we express no opinion) comply as to form in all material  respects with
the requirements of the Securities Act and the rules and regulations thereunder.

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This opinion is intended solely for your benefit and is not to be made available
to or be relied  upon by any other  person,  firm,  or entity  without our prior
written consent.



Very truly yours,

COOLEY GODWARD CASTRO
HUDDLESON & TATUM


By:  
        Samuel M. Livermore

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                                   Schedule A


Ney Grant and Betsy Gray-Grant

Clovis Mattos

Curtis Powell

Tucha Limited

Newark Holding S.A.

Teodoro Ramos Gimenez

                                      122

<PAGE>






                                    EXHIBIT L

                                ESCROW AGREEMENT

                                      123
<PAGE>


                                ESCROW AGREEMENT


     THIS ESCROW  AGREEMENT is entered into as of August __, 1996 (the  "Closing
Date"), by and among:  CASTELLE,  a California  corporation  ("Castelle");  IBEX
TECHNOLOGIES,  INC., a California corporation ("Ibex"); the Shareholders of Ibex
who are listed on Attachment A (the  "Shareholders");  NEY GRANT as agent of the
Shareholders  (the  "Shareholders'  Agent");  and  ___________________  ("Escrow
Agent").

                                    RECITALS

     A. Castelle,  Ibex, and the Shareholders are entering into an Agreement and
Plan of Reorganization of even date herewith (the  "Reorganization  Agreement"),
pursuant to which Ibex shall be merged into Castelle and Ibex shareholders shall
exchange their stock in Ibex for shares of Castelle.

     B. The Reorganization Agreement contemplates the establishment of an escrow
arrangement to secure the  indemnification and other obligations of Ibex and the
Shareholders under the Reorganization Agreement and various related agreements.

     C. Pursuant to Section 10.1 of the Reorganization Agreement, the Designated
Shareholders  have  appointed  the  Designated   Shareholders'  Agent  as  their
attorneys-in-fact for the purposes of this Agreement.

     D. The Designated  Shareholders have agreed to deposit ten percent (10%) of
the total number of shares of Common Stock of Castelle  received pursuant to the
Reorganization Agreement (the "Shares") with Escrow Agent in connection with the
Designated   Shareholders'   performance   of  their   obligations   under   the
Reorganization Agreement.

     E. The Designated Shareholders' Agent and Castelle desire that Escrow Agent
hold the Shares  pursuant to the terms hereof and to  distribute  such Shares in
accordance with the procedures specified herein.

                                    AGREEMENT

     The parties to this Escrow Agreement,  intending to be legally bound, agree
as follows:

SECTION 1. DEFINED TERMS

     Capitalized  terms used and not otherwise  defined in this Escrow Agreement
shall have the meanings assigned to them in the Reorganization Agreement.

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<PAGE>

SECTION 2. ESCROW

     2.1 Shares and Stock  Powers to be Placed in Escrow.  On the Closing  Date,
(i)  Castelle  shall  issue  certificates  for the  Shares  in the  names of the
Designated  Shareholders  evidencing  the shares of Castelle Stock to be held in
escrow  in  accordance  with  this  Escrow  Agreement,  and (ii) the  Designated
Shareholders  shall  deliver to Escrow Agent three stock powers each endorsed by
the  Designated  Shareholders  in  blank  (the  "Stock  Powers").  Ibex  and the
Designated  Shareholders'  Agent shall ensure that all  signatures  on the Stock
Powers delivered to Escrow Agent in accordance with the preceding  sentence have
been  guaranteed by a national bank or New York Stock Exchange  member firm. The
shares and Stock Powers  referred to in this Section 2.1 shall be held by Escrow
Agent in escrow (the "Escrow") in accordance  with the provisions of this Escrow
Agreement.

     2.2 Voting of Shares.  The record  owner of the Shares shall be entitled to
exercise all voting rights with respect to such Shares.

     2.3 Dividends,  Etc. Any cash,  securities or other property  distributable
(whether  by way of  dividend,  stock  split or  otherwise)  in respect of or in
exchange  for any Shares  shall not be  distributed  to the record owner of such
Shares,  but rather shall be held by the Escrow Agent in the Escrow. At the time
any Shares are required to be released from the Escrow to any person pursuant to
this  Escrow  Agreement,  any  cash,  securities  or other  property  previously
distributed  in respect of or in exchange for such shares shall be released from
the Escrow to such person.

     2.4  Transferability.  The interests of the Designated  Shareholders' Agent
and the  Shareholders  in the Escrow and in the Shares held in the Escrow  shall
not be assignable or  transferable,  other than by operation of law. No transfer
of any of such interests by operation of law shall be recognized or given effect
until Castelle shall have received written notice of such transfer.

     2.5  Fractional  Shares.  No fractional  shares of Castelle  Stock shall be
retained in or released from the Escrow  pursuant to this Escrow  Agreement.  In
connection  with any release of shares from the  Escrow,  Castelle  shall make a
cash  payment to the owner of record for such  fractional  share  which  payment
shall be determined utilizing the Stipulated Value of such Share.

     2.6  Receipt  By Escrow  Agent.  Escrow  Agent  acknowledges  receipt  from
Castelle  of a  certificate  representing  the  Shares  and from the  Designated
Shareholders'  Agent  of  stock  powers  executed  in  blank  by the  Designated
Shareholders  with  respect to the  Shares.  Escrow  Agent  accepts  appointment
hereunder and agrees to hold and distribute the Shares in accordance herewith.

SECTION 3. CLAIM PROCEDURES

     Claim Procedures  shall be as set forth in Section 9 of the  Reorganization
Agreement and this Section.

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<PAGE>

     3.1 Response Notice. Within twenty (20) business days after the delivery of
an Officer's  Certificate to the Designated  Shareholders' Agent (with a copy to
the Escrow Agent),  the Designated  Shareholders'  Agent shall deliver to Escrow
Agent and Castelle a written  notice (the  "Response  Notice")  containing:  (i)
instructions to the effect that Shares having a Stipulated  Value (as defined in
Section 5 of this Escrow  Agreement)  equal to the entire Claim Amount set forth
in such Claim  Notice are to be released  from the Escrow to  Castelle;  or (ii)
instructions  to the effect that  Shares  having a  Stipulated  Value equal to a
specified  portion (but not the entire  amount) of the Claim Amount set forth in
such Claim Notice are to be released from the Escrow to Castelle,  together with
a statement that the remaining  portion of such Claim Amount is being  disputed;
or (iii) a statement that the entire Claim Amount set forth in such Claim Notice
is being  disputed.  If no Response  Notice is received by Escrow Agent from the
Designated  Shareholders'  Agent  within  twenty  (20)  business  days after the
delivery of an Officer's Certificate to the Designated Shareholders' Agent, then
the  recipient of such Claim  Notice shall be deemed to have given  instructions
that Shares having a Stipulated Value equal to the entire Claim Amount set forth
in such Claim Notice are to be released to Castelle from the Escrow.

     3.2 Release of Shares to Castelle.

     (a) If the  Designated  Shareholders'  Agent  gives  (or is  deemed to have
     given) instructions that shares of Castelle Stock having a Stipulated Value
     equal to the entire Claim Amount set forth in an Officer's  Certificate are
     to be released  from the Escrow to  Castelle,  then  Escrow  Agent shall be
     authorized to use a Stock Power held in the Escrow to transfer to Castelle,
     from the  Escrow,  Shares  having a  Stipulated  Value  equal to such Claim
     Amount.

     (b) If a Response Notice delivered by the Designated Shareholders' Agent in
     response to an Officer's  Certificate  contains  instructions to the effect
     that Shares having a Stipulated Value equal to a specified portion (but not
     the  entire  amount)  of the  Claim  Amount  set  forth  in such  Officer's
     Certificate are to be released from the Escrow to Castelle, then (i) Escrow
     Agent  shall be  authorized  to use a Stock  Power  held in the  Escrow  to
     transfer to Castelle,  from the Escrow,  Shares  having a Stipulated  Value
     equal  to such  specified  portion  of such  Claim  Amount,  and  (ii)  the
     procedures  set forth in Section 3.2(c) of this Escrow  Agreement  shall be
     followed with respect to the remaining portion of such Claim Amount.

     (c) If a Response Notice delivered by the Designated Shareholders' Agent in
     response to a Claim  Notice  contains a statement  that all or a portion of
     the Claim  Amount set forth in such Claim  Notice is being  disputed  (such
     Claim  Amount or the  disputed  portion  thereof  being  referred to as the
     "Disputed Amount"),  then,  notwithstanding anything contained in Section 4
     of this Escrow Agreement, Escrow Agent shall continue to hold in the Escrow
     (in  addition to any other  Shares  permitted to be retained in the Escrow,
     whether in connection with any other dispute, or otherwise) Shares having a
     Stipulated  Value equal to 125% of the Disputed  Amount.  Such Shares shall
     continue to be held in the Escrow  until such time as (i)  Castelle and the
     Designated  Shareholders' Agent execute a settlement  agreement  containing
     instructions  regarding  the  release of such  Shares,  (ii)  Escrow  Agent
     receives a written decision from the arbitrator assigned to the dispute and
     an application to correct or vacate the arbitration  award can no longer be

                                      126
<PAGE>

     filed  pursuant  to the  terms of the  Reorganization  Agreement,  or (iii)
     Escrow Agent receives a copy of a court order  containing  instructions  to
     Escrow  Agent  regarding  the release of such  Shares.  Escrow  Agent shall
     thereupon  release  such  Shares  from the  Escrow in  accordance  with the
     instructions set forth in such settlement  agreement,  arbitration decision
     or court order.  (The parties  acknowledge that it is appropriate to retain
     more than 100% of the Claim Amount in the Escrow in recognition of the fact
     that Castelle may have  underestimated  the aggregate  amount of the actual
     and potential Damages arising from a particular breach.)

SECTION 4. RELEASE OF SHARES TO DESIGNATED SHAREHOLDERS' AGENT

     4.1 Shares to be  Released.  On the date 365 days after the  Closing  Date,
Escrow Agent shall release to the Designated Shareholders' Agent from the Escrow
all  Shares  then  held in the  Escrow,  except  for any  Shares  subject  to an
Officer's Certificate which has been delivered or that are to be retained in the
Escrow in accordance with Section 3.2(c) of this Escrow Agreement.

     4.2  Procedures  for  Releasing  Shares.  Any  release  of  shares  to  the
Designated  Shareholders' Agent pursuant to Section 4.1 of this Escrow Agreement
may be  effected by  utilizing  a  nationally  recognized  overnight  courier to
deliver a stock certificate to the Designated Shareholders' Agent.

SECTION 5. VALUATION OF SHARES HELD IN ESCROW

     For purposes of this Escrow  Agreement,  the "Stipulated  Value" of each of
the Shares held in the Escrow shall be deemed to be equal to $8.00  (adjusted as
appropriate to reflect any stock split,  reverse stock split,  stock dividend or
similar transaction effected by Castelle after the Closing Date).

SECTION 6. FEES AND EXPENSES

     The Shareholders shall reimburse the Designated Shareholders' Agent for all
reasonable  expenses  (including  attorneys'  fees)  incurred by the  Designated
Shareholders'  Agent in connection with the performance of his duties hereunder.
In addition, the Designated  Shareholders' Agent shall be promptly reimbursed by
the Designated  Shareholders,  in proportion to the number of shares of Castelle
Common  Stock  received  by  each of them as a  result  of the  Merger,  for any
payments which the Designated Shareholders' Agent is obligated to make and which
are made to the Escrow Agent pursuant to the indemnification  provisions of this
Escrow Agreement.

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<PAGE>

SECTION 7. PAYMENT OF ESCROW AGENT'S FEES AND EXPENSES

     All fees and expenses (including, without limitation, reasonable attorneys'
fees)  charged by Escrow  Agent for its  activities  pursuant to this  Agreement
shall be paid by Castelle pursuant to the attached fee schedule.

SECTION 8. RIGHTS AND OBLIGATIONS OF ESCROW AGENT

     8.1 Successor Escrow Agent.  Escrow Agent may resign as Escrow Agent at any
time  by  notice  to  the  Designated  Shareholders'  Agent  and  Castelle  (the
"Resignation  Notice").  Upon receipt of the Resignation  Notice, the Designated
Shareholders'  Agent and Castelle shall appoint a successor Escrow Agent,  which
shall be a banking corporation or trust company, organized under the laws of the
United  States or of the State of  California,  with a place of  business in San
Francisco.   Upon  receipt  of  notice  of   appointment   from  the  Designated
Shareholders' Agent and Castelle, Escrow Agent shall promptly deliver the Shares
to such successor. In the event the Designated  Shareholders' Agent and Castelle
do not agree upon a successor and deliver written notice thereof to Escrow Agent
within 60 days following delivery of the Resignation Notice, the Presiding Judge
of the Superior Court of the State of California, in and for the City and County
of  San   Francisco,   shall  appoint  a  successor  in   accordance   with  the
above-mentioned  guidelines,  and Escrow Agent shall promptly deliver the Shares
to such successor.

     8.2  Indemnification.  The  Designated  Shareholders'  Agent and  Castelle,
jointly and severally,  hereby agree to indemnify and hold Escrow Agent harmless
from and against any and all losses,  claims,  damages,  actions, suits or other
charges  incurred by or assessed  against Escrow Agent in the performance of its
duties  hereunder,  except to the extent  resulting  from its own  negligence or
misconduct.

     8.3 Limitation Of Liability.  Escrow Agent shall not incur any liability to
anyone for damages,  losses or expenses  with respect to (a) any action taken or
omitted in good faith upon advice of Escrow  Agent's  counsel given with respect
to  any  questions  relating  to  Escrow  Agent's  duties  and  responsibilities
hereunder,  or (b) any action taken or omitted in reliance  upon any  instrument
(including,  without  limitation,  any Officer's  Certificate or Response Notice
provided  for  herein)  which  Escrow  Agent  shall in good faith  believe to be
genuine,  to have been signed or presented by a proper  person or persons and to
conform with the provisions hereof. Furthermore, in the event Escrow Agent shall
be uncertain as to its rights or obligations  hereunder,  or in the event Escrow
Agent shall receive any communication from the Designated Shareholders' Agent or
Castelle with respect to the Shares which, in the opinion of Escrow Agent, is in
conflict  with any of the  provisions of this  Agreement,  Escrow Agent shall be
entitled to refrain from taking any action until it shall be directed  otherwise
in writing by the Designated  Shareholders'  Agent and Castelle or by order of a
court of competent jurisdiction.

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<PAGE>

     8.4  Controversies.  If any controversy  arises between the parties to this
Agreement,  or with any  other  party,  concerning  the  subject  matter of this
Agreement,  its  terms or  conditions,  Escrow  Agent  will not be  required  to
determine the  controversy or to take any action  regarding it. Escrow Agent may
hold all documents and funds and may wait for settlement of any such controversy
pursuant  to Section  9.11 of the  Reorganization  Agreement  hereof or by final
appropriate legal  proceedings or other means as, in Escrow Agent's  discretion,
Escrow  Agent  may  require,  despite  what may be set forth  elsewhere  in this
Agreement.  In such  event,  Escrow  Agent  will not be liable for  interest  or
damage.

     8.5 No Interest. Notwithstanding any provision to the contrary contained in
any other  agreement  between or among any of the parties  hereto,  Escrow Agent
shall have no interest in the Shares.

     8.6 No  Implied  Obligations.  This  Agreement  sets  forth  the  exclusive
obligations  of Escrow  Agent  with  respect  to any and all  matters  pertinent
hereto,  and no implied duties or obligations of Escrow Agent shall be read into
this Agreement.


SECTION 9. GENERAL

     9.1 Confirmation of Appointment.  The Shareholders  confirm the appointment
and authority of the Designated Shareholders' Agent as set forth in Section 10.1
of Reorganization  Agreement with respect to all matters relating to this Escrow
Agreement.  Any successor to the Designated Shareholders' Agent who is appointed
in  accordance  with  the  provisions  of  Section  10.1  of the  Reorganization
Agreement  shall  be  deemed  to be the  "Designated  Shareholders'  Agent"  for
purposes of this Escrow Agreement.  Any document executed or action taken by the
Shareholders' Agent shall be binding upon all of the Shareholders.

     9.2 Other Agreements. Nothing in this Escrow Agreement is intended to limit
any of Castelle's  rights,  or any obligation of any Shareholder or Ibex,  under
the Reorganization Agreement.

     9.3 Notices. Any notice or other communication  required or permitted to be
delivered to any party under this Escrow Agreement shall be in writing and shall
be deemed  properly  delivered,  given and received when  delivered (by hand, by
registered  mail, by courier or express delivery service or by facsimile) to the
address or facsimile  telephone  number set forth beneath the name of such party
below (or to such other  address  or  facsimile  telephone  number as such party
shall have specified in a written notice given to the other parties hereto):

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<PAGE>

if to the Designated Shareholders' Agent or any of the Shareholders:

                      NEY GRANT
                      2725 Romer Boulevard
                      Pollock Pines, CA  95726
                      Facsimile:  (916) 647-2055

               if to Castelle:

                      CASTELLE

                      3255-3 Scott Boulevard
                      Santa Clara, California 95054
                      Attn:  President
                      Facsimile:  (408) 654-4699

               if to Escrow Agent:

                      --------------------

                      --------------------

                      --------------------

     9.4  Counterparts.  This  Escrow  Agreement  may be executed in two or more
counterparts,  each of  which  shall be  deemed  an  original,  and all of which
together shall constitute one and the same instrument.

     9.5 Time of the Essence. Time is of the essence of this Escrow Agreement.

     9.6 Headings.  The underlined  headings  contained in this Escrow Agreement
are for convenience of reference only,  shall not be deemed to be a part of this
Escrow   Agreement  and  shall  not  be  referred  to  in  connection  with  the
construction or interpretation of this Escrow Agreement.

     9.7 Governing Law; Venue.

     (a) This Escrow  Agreement  shall be  construed  in  accordance  with,  and
     governed in all respects by, the internal  laws of the State of  California
     (without giving effect to principles of conflicts of laws).

     (b)  Subject  to  the  arbitration   provisions  of  Section  9.11  of  the
     Reorganization  Agreement,  any  legal  action  or other  legal  proceeding
     relating to this Escrow  Agreement or the  enforcement  of any provision of
     this Escrow Agreement may be brought or otherwise commenced in any state or
     federal court located in the State of California. Each party to this Escrow
     Agreement:

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<PAGE>

          (i) expressly and irrevocably consents and submits to the jurisdiction
          of each state and  federal  court  located in the State of  California
          (and each  appellate  court  located  in the State of  California)  in
          connection with any such legal proceeding;

          (ii) agrees that each state and federal  court located in the State of
          California shall be deemed to be a convenient forum; and

          (iii)  agrees  not to  assert  (by  way of  motion,  as a  defense  or
          otherwise),  in any such legal  proceeding  commenced  in any state or
          federal court located in the State of California,  any claim that such
          party is not subject  personally  to the  jurisdiction  of such court,
          that such legal proceeding has been brought in an inconvenient  forum,
          that the venue of such  proceeding  is  improper  or that this  Escrow
          Agreement or the subject  matter of this Escrow  Agreement  may not be
          enforced in or by such court.

     (c) Unless  addressed in Section 9.7(b) of this Escrow  Agreement,  nothing
     contained  in this Escrow  Agreement  shall be deemed to limit or otherwise
     affect the right of any party  hereto to commence any legal  proceeding  or
     otherwise  proceed  against  any other  party  hereto in any other forum or
     jurisdiction.

     9.8 Successors and Assigns; Parties in Interest.

     (a)  Subject to  Sections  2.4 and 9.8(b) of this  Escrow  Agreement,  this
     Escrow Agreement shall be binding upon: Ibex and its successors and assigns
     (if any); the Designated Shareholders' Agent and the Shareholders and their
     respective  estates,  successors and assigns (if any); and Castelle and its
     successors and assigns (if any).  This Escrow  Agreement shall inure to the
     benefit  of:  Ibex;  the  Shareholders;  Castelle;  the  other  Indemnitees
     (subject  to  Section  9.8  of  the  Reorganization   Agreement);  and  the
     respective successors (if any) of the foregoing.

     (b) Castelle  may freely  assign any or all of its rights under this Escrow
     Agreement,  in whole or in part, to any other person without  obtaining the
     consent  or  approval  of any other  party  hereto or of any other  person.
     Castelle may not delegate its  obligations  under this Escrow  Agreement to
     any other person without the prior consent of the Designated  Shareholders'
     Agent. None of the Shareholders, the Designated Shareholders' Agent or Ibex
     shall be  permitted to assign any of his, her or its rights or delegate any
     of  his,  her  or its  obligations  under  this  Escrow  Agreement  without
     Castelle's prior reasonable written consent.

     9.9 Waiver.

     (a) No  failure  on the part of any person to  exercise  any power,  right,
     privilege or remedy under this Escrow  Agreement,  and no delay on the part
     of any person in  exercising  any power,  right,  privilege or remedy under
     this Escrow  Agreement,  shall  operate as a waiver of such  power,  right,
     privilege or remedy;  and no single or partial  exercise of any such power,
     right,  privilege  or remedy shall  preclude any other or further  exercise
     thereof or of any other power, right, privilege or remedy.

                                      131
<PAGE>

     (b) No person shall be deemed to have waived any claim  arising out of this
     Escrow  Agreement,  or any power,  right,  privilege  or remedy  under this
     Escrow Agreement,  unless the waiver of such claim, power, right, privilege
     or remedy is expressly set forth in a written  instrument duly executed and
     delivered  on  behalf  of such  person;  and any such  waiver  shall not be
     applicable or have any effect  except in the specific  instance in which it
     is given.

     9.10  Amendments.  This  Escrow  Agreement  may not be  amended,  modified,
altered  or  supplemented  other  than by means  of a  written  instrument  duly
executed and  delivered on behalf of Castelle and the  Designated  Shareholders'
Agent.

     9.11  Severability.  In  the  event  that  any  provision  of  this  Escrow
Agreement,  or the  application  of any such  provision  to any person or set of
circumstances,   shall  be   determined  to  be  invalid,   unlawful,   void  or
unenforceable  to any extent,  the remainder of this Escrow  Agreement,  and the
application of such provision to persons or circumstances other than those as to
which it is determined to be invalid, unlawful, void or unenforceable, shall not
be impaired or otherwise affected and shall continue to be valid and enforceable
to the fullest extent permitted by law.

     9.12 Entire Agreement.  This Escrow Agreement, the Reorganization Agreement
and the  Exhibits  thereto  set forth the entire  understanding  of the  parties
relating  to the subject  matter  hereof and  thereof  and  supersede  all prior
agreements and  understandings  among or between any of the parties  relating to
the subject matter hereof and thereof.

     9.13 Construction.

     (a) For purposes of this Escrow  Agreement,  whenever the context requires:
     the singular number shall include the plural, and vice versa; the masculine
     gender shall include the feminine and neuter  genders;  the feminine gender
     shall include the masculine and neuter genders; and the neuter gender shall
     include the masculine and feminine genders.

     (b) The parties  hereto agree that any rule of  construction  to the effect
     that ambiguities are to be resolved against the drafting party shall not be
     applied in the construction or interpretation of this Escrow Agreement.

     (c) As used in this Escrow Agreement,  the words "include" and "including,"
     and variations thereof, shall not be deemed to be terms of limitation,  but
     rather shall be deemed to be followed by the words "without limitation."

     (d) Except as otherwise indicated,  all references in this Escrow Agreement
     to "Sections" are intended to refer to Sections of this Escrow Agreement.

                                      132

<PAGE>


     IN WITNESS  WHEREOF,  the parties have executed this Escrow Agreement as of
the date first above written.

                              CASTELLE,

                              a California corporation







                              By:



                              IBEX TECHNOLOGIES, INC.,
                              a California corporation




                              By:
                              Ney Grant, President











                             
                              Shareholders' Agent



                              ESCROW AGENT

                                      133

<PAGE>






                                  ATTACHMENT A

                                  SHAREHOLDERS





Ney Grant and Betsy Gray-Grant

Clovis Mattos

Curtis Powell

                                      134

<PAGE>


                                  ATTACHMENT B

                            ESCROW AGENT FEE SCHEDULE

                                      135

<PAGE>


                                    EXHIBIT M

                            FORM OF IRREVOCABLE PROXY


                                      136


<PAGE>


                                IRREVOCABLE PROXY


     ____________________  ("Shareholder"),  a shareholder of Ibex Technologies,
Inc., a California  corporation (the  "Company"),  hereby  irrevocably  appoints
Castelle, a California  corporation,  the attorney and proxy of the undersigned,
with full  power of  substitution  and  resubstitution,  to vote the  __________
shares of voting common stock of the Company owned of record by Shareholder (the
"Shares") with respect to the following matters (the "Identified Matters"):

     (a) the Reorganization Agreement (as herein defined), the Merger (as herein
     defined),  and the other  transactions  contemplated by the  Reorganization
     Agreement;

     (b)  any  proposal  made  in  opposition  to or  in  competition  with  the
     consummation of the Merger;

     (c) any proposal  contemplating  any transaction  involving:  (i) the sale,
     license,  disposition or  acquisition  of all or a material  portion of the
     Company's  business  or  assets;  or  (ii)  the  issuance,  disposition  or
     acquisition  of (A) any  capital  stock or  other  equity  security  of the
     Company, (B) any option, call, warrant or right (whether or not immediately
     exercisable)  to acquire,  or otherwise  relating to, any capital  stock or
     other equity  security of the Company,  or (C) any security,  instrument or
     obligation that is or may become  convertible  into or exchangeable for any
     capital stock or other equity security of the Company; or

     (d)  any  merger,  consolidation,  business  combination,  share  exchange,
     reorganization or similar transaction involving the Company; and

     (e) any other  action or  agreement  that could  reasonably  be expected to
     result  in  (i) a  breach  of  any  representation,  warranty  covenant  or
     obligation  of  the  Company  or  Shareholder   under  the   Reorganization
     Agreement,  or under any other agreement  executed on behalf of the Company
     or  Shareholder,  or  (ii)  any  of the  conditions  to  the  Company's  or
     Castelle's  obligations  under  the  Reorganization   Agreement  not  being
     satisfied.

     This Proxy shall terminate at such time (if ever) as that certain Agreement
and Plan of  Reorganization  dated as of August  __,  1996 (the  "Reorganization
Agreement")  among  Castelle,   the  Company,   Shareholder  and  certain  other
shareholders  of the  Company,  providing  for the  merger of the  Company  into
Castelle  (the  "Merger"),  shall  have  been  validly  terminated  or closed in
accordance with its terms. Upon the execution hereof, all prior proxies given by
Shareholder  with respect to the Shares are hereby  revoked,  and no  subsequent
proxies will be given.  This Proxy is  irrevocable,  is coupled with an interest
and is granted in  consideration  of Castelle  entering into the  Reorganization
Agreement.  The attorneys and proxies  appointed  pursuant to this Proxy will be
empowered  (at  all  times  prior  to  the  termination  of  the  Reorganization
Agreement) to exercise (in their  discretion and in such manner as they may deem
appropriate)  all voting and other  rights of  Shareholder  with  respect to the
Shares (including,  without limitation, the power to execute and deliver written

                                      137
<PAGE>

consents with respect to the Shares), with respect to the Identified Matters, at
every  meeting of the  shareholders  of the Company  (and every  adjournment  or
postponement  thereof)  or by  written  consent  in lieu of such a  meeting,  or
otherwise.

     This  Proxy  shall  be  binding  upon  the  Shareholder  and  his  personal
representatives,  executors,  administrators,  estates,  heirs,  successors  and
assigns (if any).  This Proxy  shall  inure to the  benefit of Castelle  and its
respective successors and assigns (if any).







Dated:  ______________, 1996                    _______________________________
                                                          Shareholder

                                      138
<PAGE>


                   CASTELLE TO ACQUIRE IBEX TECHNOLOGIES, INC.
       Leader in LAN Fax Servers and Leader in Fax-on-Demand to Join Forces

SANTA CLARA, Calif., Aug. 22, 1996--Castelle  (NSDQ:CSTL), a leading supplier of
internetwork fax- and print-server  products,  has signed a definitive agreement
to purchase Ibex Technologies, Inc., the market leader in fax-on-demand systems.

Under  the  terms of the  agreement,  which is  accounted  for as a  pooling  of
interests,   Castelle  will  acquire  all  of  the  outstanding   stock  of  the
privately-held Ibex Technologies in exchange for approximately 850,000 shares of
Castelle  common  stock.  The closing  sale price for  Castelle  common stock on
NASDAQ on Aug. 21, 1996, was $7.00 per share.  The transaction has been approved
by the boards of directors of both  companies  and is subject to the approval of
Castelle and Ibex shareholders.

Castelle develops products that broaden  communications among workgroup users by
enabling them to send and receive faxes and print documents from their networked
PCs; the products are sold through domestic and international distributors,  and
selected  OEMs  worldwide.  Ibex's  product  line  includes  fax-on-demand,  fax
gateway,  fax  broadcast  and Web fax  applications  which are sold  direct  and
through  value-added  resellers  (VARs).  According  to recent  market  studies,
Castelle  and Ibex  hold 17  percent  and 18  percent  shares of the LAN fax and
fax-on-demand markets, respectively.

Art Bruno,  Castelle  CEO and  chairman,  said the  acquisition  will create "an
entity that  possesses the  technologies  and channels  necessary to address the
emerging market for universal  information-on-demand  solutions integrating fax,
e-mail and the World Wide Web. Unlike many merging companies,  Castelle and Ibex
have truly  complementary,  non-conflicting  sales  channels.  Ibex has over 100
sophisticated  VARs that have helped sell its products  into Fortune 1000 firms.
Castelle's workgroup-oriented products are available through a worldwide network
of leading distributors and resellers.  Together these channels will expand both
companies' sales  opportunities,  enabling Ibex to deliver  fax-on-demand to the
mass  market  and  Castelle  to  penetrate  large  enterprises  with its LAN fax
solutions."

Following the completion of the acquisition,  which is expected in October, Ibex
will operate as the Ibex Division of Castelle,  and its 25 employees will remain
in the  company's El Dorado  Hills,  Calif.,  headquarters.  Grant will head the
division,  reporting to Bruno.  Grant and other key Ibex  executives  will enter
into employment and non-competition agreements with Castelle.

Castelle  reported  1995  revenues of $25.1  million.  Ibex's 1995 revenues were
approximately $3.1 million.

                                       139


<PAGE>


                                   APPENDIX B



<PAGE>


Board of Directors

Castelle
August 22, 1996
Page 1









                                                                 August 22, 1996


Board of Directors
Castelle
3255-3 Scott Boulevard
Santa Clara, CA  95054

Gentlemen:

     We  understand  that  Castelle  ("Castelle"  or  the  "Company")  and  Ibex
Technologies,  Inc.  ("Ibex") have entered into a merger  agreement  pursuant to
which Ibex shall be merged with and into Castelle (the "Merger").  In connection
with the  Merger,  Castelle  will issue  850,000  shares of its Common  Stock in
exchange for all Ibex capital  stock and options to purchase  Ibex capital stock
(the "Merger Consideration").

     You have requested our opinion of the Merger with respect to fairness, from
a financial point of view, to Castelle.

     In connection with our review, we have, among other things

     (i)  reviewed the  Agreement  and Plan of  Reorganization  dated August 22,
          1996,

     (ii) reviewed financial information with respect to the business operations
          of the  Company  including,  but not  limited to audited  consolidated
          financial  statements  for the fiscal  years ended  December 31, 1993,
          December  31, 1994 and December  31, 1995 and  unaudited  consolidated
          financial data for the period ended June 28, 1996,

     (iii)reviewed   financial   information   with   respect  to  the  business
          operations of Ibex  including,  but not limited to, audited  financial
          statements  for the fiscal years ended  December 31, 1994 and December
          31,  1995 and  unaudited  consolidated  financial  data for the period
          ended June 30, 1996,

     (iv) reviewed certain internal  financial,  operating and other information
          relating  to  Castelle  and  Ibex  (including  financial  projections)
          prepared by the respective managements of each company,

     (v)  held  discussions  with  certain  members  of both  Castelle  and Ibex
          management concerning past and current operations, financial condition
          and business prospects,

     (vi) held discussions and reviewed  material prepared by certain members of
          Castelle  management  analyzing their  assessments of the business and
          prospects of Castelle and Ibex and the potential  financial  effect of
          the Merger on Castelle if the Merger were consummated,

     (vii)discussed with Castelle  management the results of their due diligence
          of Ibex and reviewed related documents and analyses,

     (viii) reviewed a  comparison  of  operating  results  and other  financial
          information of Castelle and Ibex with other  companies which we deemed
          appropriate,

     (ix) reviewed a comparison  of the  financial  terms of the Merger with the
          terms of  certain  other  mergers  and  transactions  which we  deemed
          appropriate, and

     (x)  considered such other  information,  financial studies and analyses as
          we  deemed   relevant  and  performed  such   analyses,   studies  and
          investigations as we deemed appropriate.

     Unterberg  Harris  has  assumed  and  relied  upon,   without   independent
verification,  the accuracy and completeness of the information  reviewed by it.
With  respect  to any  financial  projections,  we  assumed  that they have been
reasonably  prepared on bases reflecting the best currently  available estimates
and judgments of the respective  future  financial  performances of Castelle and
Ibex and the future financial  performance of the combined company. We also have
assumed without  independent  verification that Ibex owns and has adequate legal
protection for all material  intellectual property it purports to own, that Ibex
owns or has adequate  rights to use all  intellectual  property  material to its
business  as  conducted   or   contemplated   to  be  conducted   and  that  the
representations and warranties of Castelle and Ibex in the Agreement and Plan of
Reorganization  are true and correct.  We have also assumed that the merger will
be accounted for as a pooling of interests.

     We have not conducted a physical inspection of the properties or facilities
of  Castelle  or Ibex or made any  independent  valuation  or  appraisal  of the
assets,  liabilities,  patents or intellectual property of Castelle or Ibex, nor
have we been furnished with any such  valuations or appraisals.  We have assumed
that the  assessments of management have been made in good faith and reflect the
best currently  available  management  judgments as to the matters covered.  Our
opinion is necessarily  based upon economic,  market and other  conditions as in
effect  on, and the  information  made  available  to us as of, the date of this
letter.

     We understand that in considering the Merger, the Board of Directors of the
Company has considered a wide range of financial and non-financial factors, many
of which are beyond the scope of this  letter.  This  letter is not  intended to
substitute  for the Board's  exercise of its own business  judgment in reviewing
the Merger.

     Based upon and subject to the foregoing  considerations,  it is our opinion
as financial  advisors that the Merger  Consideration  is fair, from a financial
point of view, to Castelle.

     This  opinion  is  delivered  to you  based  on your  agreement  that it is
intended solely for the benefit and use of the Company in considering the Merger
and that the Company  will not use this  opinion for any other  purpose and will
not  reproduce,  disseminate  or refer to this  opinion  at any time or make any
public  reference to us or our  engagement  to deliver this opinion  without our
prior  written  consent.  It  should be  understood  that,  although  subsequent
developments  may  affect  this  opinion,  Unterberg  Harris  does  not have any
obligation to update, revise or reaffirm this opinion.  Delivery of this opinion
is not  intended to confer  rights on any third party,  including  stockholders,
employees or creditors of the Company or Ibex.

                                    Very truly yours,

                                    Unterberg Harris



                                    By:  /s/ Unterberg Harris
                                       


<PAGE>







                                   APPENDIX C

Div. 1    Title 1


                             GENERAL CORPORATION LAW

ss. 1300.           Corporate purchase of dissenting shares

     (a)  If  the  approval  of  the  outstanding  shares  (Section  152)  of  a
          corporation is required for a  reorganization  under  subdivisions (a)
          and (b) or subdivision (e) or (f) of Section 1201, each shareholder of
          the  corporation   entitled  to  vote  on  the  transaction  and  each
          shareholder of a subsidiary corporation in a short-form merger may, by
          complying  with this  chapter,  require the  corporation  in which the
          shareholder  holds  shares to  purchase  for cash at their fair market
          value the shares owned by the shareholder  which are dissenting shares
          as  defined  in  subdivision  (b).  The  fair  market  value  shall be
          determined as of the day before the first announcement of the terms of
          the  proposed  reorganization  or  short-form  merger,  excluding  any
          appreciation or  depreciation  in consequence of the proposed  action,
          but  adjusted  for any stock  split,  reverse  stock  split,  or share
          dividend which becomes effective thereafter.

     (b)  As used in this chapter,  "dissenting  shares" means shares which come
          within all of the following descriptions:

          (1)  Which  were  not  immediately  prior  to  the  reorganization  or
               short-form  merger  either (A) listed on any national  securities
               exchange  certified by the  Commissioner  of  Corporations  under
               subdivision (o) of Section 25100 or (B) listed on the list of OTC
               margin  stocks  issued by the Board of  Governors  of the Federal
               Reserve System,  and the notice of meeting of shareholders to act
               upon the  reorganization  summarizes  this  section and  Sections
               1301, 1302, 1303 and 1304; provided, however, that this provision
               does not apply to any shares with  respect to which there  exists
               any restriction on transfer  imposed by the corporation or by any
               law or  regulation;  and provided,  further,  that this provision
               does not apply to any class of shares  described in  subparagraph
               (A) or (B) if demands  for  payment  are filed with  respect to 5
               percent or more of the outstanding shares of that class.

          (2)  Which  were  outstanding  on the  date for the  determination  of
               shareholders  entitled to vote on the reorganization and (A) were
               not voted in favor of the  reorganization or, (B) if described in
               subparagraph  (A) or (B) of paragraph (1) (without  regard to the
               provisos   in   that   paragraph),   were   voted   against   the
               reorganization,  or which  were held of  record on the  effective
               date of a short-form merger; provided, however, that subparagraph
               (A) rather than subparagraph (B) of this paragraph applies in any
               case where the  approval  required  by Section  1201 is sought by
               written consent rather than at a meeting.

          (3)  Which  the   dissenting   shareholder   has  demanded   that  the
               corporation  purchase at their fair market  value,  in accordance
               with Section 1301.

          (4)  Which the dissenting  shareholder has submitted for  endorsement,
               in accordance with Section 1302.


                                       1.

<PAGE>


Div. 1               Title 1


     (c)  As  used  in  this  chapter,   "dissenting   shareholder"   means  the
          recordholder of dissenting shares and includes a transferee of record.
          (Added by Stats.  1975,  c. 682 ss. 7 eff.  Jan.  1, 1977.  Amended by
          Stats.1976,  c. 641, ss. 21.3, eff. Jan. 1, 1977; Stats.  1982, c. 36,
          p. 69, ss. 3, eff. Feb. 17, 1982;  Stats.  1990, c. 1018 (A.B.  2259),
          ss. 2; Stats.1993, c. 543 (A.B. 2063), ss. 13.)


ss. 1301.       Notice to dissenting shareholders; demand for purchase of shares

     (a)  If, in the case of a reorganization, any shareholders of a corporation
          have a right under Section 1300, subject to compliance with paragraphs
          (3) and (4) of subdivision (b) thereof,  to require the corporation to
          purchase their shares for cash,  such  corporation  shall mail to each
          such shareholder a notice of the approval of the reorganization by its
          outstanding shares (Section 152) within 10 days after the date of such
          approval  accompanied by a copy of Sections 1300, 1302, 1303, 1304 and
          this section,  a statement of the price  determined by the corporation
          to represent  the fair market value of the  dissenting  shares,  and a
          brief  description of the procedure to be followed if the  shareholder
          desires to exercise the shareholder's  right under such sections.  The
          statement of price constitutes an offer by the corporation to purchase
          at the price stated any  dissenting  shares as defined in  subdivision
          (b) of  Section  1300,  unless  they lose their  status as  dissenting
          shares under Section 1309.

     (b)  Any shareholder who has a right to require the corporation to purchase
          the  shareholder's  shares for cash  under  Section  1300,  subject to
          compliance with paragraphs (3) and (4) of subdivision (b) thereof, and
          who desires the corporation to purchase such shares shall make written
          demand  upon the  corporation  for the  purchase  of such  shares  and
          payment to the  shareholder  in cash of their fair market  value.  The
          demand is not effective  for any purpose  unless it is received by the
          corporation  or any transfer  agent  thereof (1) in the case of shares
          described in clause (i) or (ii) of paragraph (1) of subdivision (b) of
          Section 1300 (without regard to the provisos in that  paragraph),  not
          later  than the date of the  shareholders'  meeting  to vote  upon the
          reorganization, or (2) in any other case within 30 days after the date
          on which the notice of the approval by the outstanding shares pursuant
          to  subdivision  (a) or the  notice  pursuant  to  subdivision  (i) of
          Section 1110 was mailed to the shareholder.

     (c)  The demand  shall  state the  number  and class of the shares  held of
          record by the  shareholder  which  the  shareholder  demands  that the
          corporation  purchase  and  shall  contain  a  statement  of what such
          shareholder  claims to be the fair market  value of those shares as of
          the day before the  announcement  of the  proposed  reorganization  or
          short-form  merger.  The statement of fair market value constitutes an
          offer by the  shareholder to sell the shares at such price.  (Added by
          Stats.1975, c. 682, ss. 7 eff. Jan. 1, 1977. Amended by Stats.1976, c.
          641, ss. 21.6, eff. Jan. 1, 1977; Stats.1980,  c. 501, p. 1052, ss. 5;
          Stats.1980, c. 1155, p. 3831, ss. 1.)




                                       2.

<PAGE>


Div. 1             Title 1

ss. 1302.          Shareholder certificates or notice; time limit for submission

     Within  30 days  after  the date on which  notice  of the  approval  by the
outstanding shares or the notice pursuant to subdivision (i) of Section 1110 was
mailed to shareholder,  the  shareholder  shall submit to the corporation at its
principal  office or at the office of any  transfer  agent  thereof,  (a) if the
shares are certificated securities,  the shareholder's certificates representing
any shares which the shareholder  demands that the corporation  purchase,  to be
stamped or endorsed with a statement that the shares are dissenting shares or to
be exchanged for certificates of appropriate denomination so stamped or endorsed
or (b) if the shares are uncertificated securities, written notice of the number
of shares which the  shareholder  demands that the  corporation  purchase.  Upon
subsequent  transfers of the dissenting  shares on the books of the corporation,
the  new  certificates,   initial  transaction  statement,   and  other  written
statements  issued therefor shall bear a like statement,  together with the name
of the original dissenting holder of the shares.  (Added by Stats.1975,  c. 682,
ss. 7, eff. Jan. 1, 1977. Amended by Stats.1986, c. 766, ss. 23.)


ss. 1303.           Agreed price; interest; filing agreements; time for payment

     (a)  If the  corporation  and the  shareholder  agree  that the  shares are
          dissenting  shares  and  agree  upon  the  price  of the  shares,  the
          dissenting  shareholder  is entitled to the agreed price with interest
          thereon at the legal rate on judgments from the date of the agreement.
          Any agreements  fixing the fair market value of any dissenting  shares
          as between the corporation and the holders thereof shall be filed with
          the secretary of the corporation.

     (b)  Subject to the provisions of Section 1306,  payment of the fair market
          value of  dissenting  shares  shall be made  within 30 days  after the
          amount  thereof has been agreed or within 30 days after any  statutory
          or  contractual   conditions  to  the  reorganization  are  satisfied,
          whichever  is  later,  and in the  case  of  certificated  securities,
          subject to surrender of the  certificates  therefor,  unless  provided
          otherwise by agreement. (Added by Stats.1975, c. 682, ss. 7, eff. Jan.
          1, 1977. Amended by Stats.1980, c. 501, p. 1053, ss. 6; Stats.1986, c.
          766, ss. 24.)


ss. 1304.      Action to determine whether shares are dissenting or to determine
               fair market value
                   

     (a)  If the corporation  denies that the shares are dissenting  shares,  or
          the corporation and the shareholder fail to agree upon the fair market
          value of the shares,  then the shareholder  demanding purchase of such
          shares as dissenting shares or any interested corporation,  within six
          months  after  the  date  on  which  notice  of  the  approval  by the
          outstanding shares (Section 152) or notice pursuant to subdivision (i)
          of Section 1110 was mailed to the shareholder, but not thereafter, may
          file a complaint in the superior  court of the proper  county  praying

                                       3
<PAGE>

          the court to determine whether the shares are dissenting shares or the
          fair market value of the  dissenting  shares or both may  intervene in
          any action pending on such a complaint.

     (b)  Two or more  dissenting  shareholders  may  join as  plaintiffs  or be
          joined as  defendants  in any such action and two or more such actions
          may be consolidated.

     (c)  On the trial of the action,  the court shall determine the issues.  If
          the status of the shares as dissenting  shares is in issue,  the court
          shall  first  determine  that issue.  If the fair market  value of the
          dissenting  shares is in issue,  the court shall  determine,  or shall
          appoint one or more impartial appraisers to determine, the fair market
          value of the shares. (Added by Stats.1975, c. 682, ss. 7, eff. Jan. 1,
          1977.)


ss. 1305.           Appraiser's report

     (a)  If the court appoints an appraiser or  appraisers,  they shall proceed
          forthwith  to determine  the fair market  value per share.  Within the
          time fixed by the court, the appraisers,  or a majority of them, shall
          make  and file a  report  in the  office  of the  clerk of the  court.
          Thereupon,  on the motion of any party,  the report shall be submitted
          to the court and  considered on such  evidence as the court  considers
          relevant.  If the court  finds the  report  reasonable,  the court may
          confirm it.

     (b)  If a  majority  of the  appraisers  appointed  fail to make and file a
          report  within  10 days from the date of their  appointment  or within
          such  further time as may be allowed by the court or the report is not
          confirmed  by the court,  the court  shall  determine  the fair market
          value of the dissenting shares.

     (c)  Subject to the provisions of Section 1306,  judgment shall be rendered
          against the  corporation  for  payment of an amount  equal to the fair
          market  value of each  dissenting  share  multiplied  by the number of
          dissenting shares which any dissenting  shareholder who is a party, or
          who  has  intervened,  is  entitled  to  require  the  corporation  to
          purchase,  with  interest  thereon  at the legal rate from the date on
          which judgment was entered.

     (d)  Any  such  judgment  shall  be  payable   forthwith  with  respect  to
          uncertificated   securities   and,   with   respect  to   certificated
          securities,  only upon the endorsement and delivery to the corporation
          of the  certificates  for the shares  described in the  judgment.  Any
          party may appeal from the judgment.

     (e)  The costs of the  action,  including  reasonable  compensation  to the
          appraisers to be fixed by the court,  shall be assessed or apportioned
          as the court considers  equitable,  but, if the appraisal  exceeds the
          price offered by the corporation,  the corporation shall pay the costs
          (including in the  discretion of the court  attorneys'  fees,  fees of
          expert  witnesses and interest at the legal rate on judgments from the
          date of compliance with Sections 1300, 1301 and 1302 if


                                       4.

<PAGE>


Div. 1               Title 1

the value  awarded by the court for the  shares is more than 125  percent of the
price offered by the corporation under subdivision (a) of Section 1301).  (Added
by Stats.1975,  c. 682, ss. 7, eff. Jan. 1, 1977. Amended by Stats.1976, c. 641,
ss. 22, eff. Jan. 1, 1977; Stats.1976, c. 235, p.
1068, ss. 16; Stats.1986, c. 766, ss. 25.)


ss. 1306.           Holders of dissenting shares as creditors

     To the extent that the  provisions  of Chapter 5 prevent the payment to any
holders of  dissenting  shares of their fair  market  value,  they shall  become
creditors of the  corporation  for the amount thereof  together with interest at
the legal rate on judgments  until the date of payment,  but  subordinate to all
other  creditors  in any  liquidation  proceeding,  such debt to be payable when
permissible under the provisions of Chapter 5. (Added by Stats.1975, c. 682, ss.
7, eff. Jan. 1, 1977)


ss. 1307.           Dividends on dissenting shares after approval date

     Cash  dividends  declared and paid by the  corporation  upon the dissenting
shares  after the date of  approval  of the  reorganization  by the  outstanding
shares  (Section  152) and prior to payment  for the  shares by the  corporation
shall  be  credited  against  the  total  amount  to be paid by the  corporation
therefor. (Added by Stats.1975, c. 682, ss. 7, eff. Jan. 1, 1977.)


ss. 1308.           Rights in dissenting  shares prior to determination  of fair
                    market value

     Except as expressly  limited in this chapter,  holders of dissenting shares
continue to have all the rights and privileges  incident to their shares,  until
the fair market value of their shares is agreed upon or determined. A dissenting
shareholder  may not  withdraw  a demand  for  payment  unless  the  corporation
consents thereto. (Added by Stats.1975, c. 682, ss. 7, eff. Jan. 1, 1977.)


ss. 1309.           Termination of dissenting shareholder status

     Dissenting  shares lose their status as  dissenting  shares and the holders
thereof cease to be dissenting  shareholders and cease to be entitled to require
the  corporation  to  purchase  their  shares upon the  happening  of any of the
following:

     (a)  The corporation  abandons the reorganization.  Upon abandonment of the
          reorganization,  the corporation shall pay on demand to any dissenting
          shareholder  who has  initiated  proceedings  in good faith under this
          chapter  all  necessary  expenses  incurred  in such  proceedings  and
          reasonable attorneys' fees.


                                       5.

<PAGE>


Div. 1               Title 1


     (b)  The shares are transferred  prior to their  submission for endorsement
          in accordance with Section 1302 or are surrendered for conversion into
          shares of another class in accordance with articles.

     (c)  The dissenting  shareholder  and the corporation do not agree upon the
          status of the shares as dissenting  shares or upon the purchase  price
          of the  shares,  and  neither  files a complaint  or  intervenes  in a
          pending  action as provided in Section  1304,  within six months after
          the date on which notice of the approval by the outstanding  shares or
          notice  pursuant to  subdivision  (i) of Section 110 was mailed to the
          shareholder.

     (d)  The  dissenting  shareholder,  with the  consent  of the  corporation,
          withdraws  the  shareholder's  demand for  purchase of the  dissenting
          shares. (Added by Stats.1975, c. 682, ss. 7, eff. Jan. 1, 1977.)


ss. 1310.           Litigation; suspension of proceedings

     If litigation is  instituted to test the  sufficiency  or regularity of the
votes of the shareholders in authorizing a reorganization, any proceedings under
Sections  1304 and 1305 shall be  suspended  until final  determination  of such
litigation. (Added by Stats.1975, c. 682, ss. 7, eff. Jan. 1, 1977.)


ss. 1311.          Shares specifying amount in event of merger or reorganization

     This  chapter,  except  Section  1312,  does not apply to classes of shares
whose  terms and  provisions  specifically  set  forth the  amount to be paid in
respect to such  shares in the event of a  reorganization  or merger.  (Added by
Stats. 1975, c. 682, ss. 7 eff. Jan. 1, 1977. Amended by Stats.1988, c. 919, ss.
8.)


ss. 1312.          Attack on validity of merger or reorganization

     (a)  No shareholder of a corporation  who has a right under this chapter to
          demand  payment of cash for the shares held by the  shareholder  shall
          have any  right at law or in  equity to  attack  the  validity  of the
          reorganization or short-form  merger, or to have the reorganization or
          short-form merger set aside or rescinded,  except in an action to test
          whether  the number of shares  required  to  authorize  or approve the
          reorganization  have  been  legally  voted in favor  thereof;  but any
          holder of shares of a class  whose terms and  provisions  specifically
          set forth the  amount to be paid in  respect to them in the event of a
          reorganization   or  short-form  merger  is  entitled  to  payment  in
          accordance  with those terms and provisions or, if the principal terms
          of the  reorganization  are approved  pursuant to  subdivision  (b) of
          Section 1202, is entitled to payment in accordance  with the terms and
          provisions of the approved reorganization.


                                       6.

<PAGE>


Div. 1            Title 1

     (b)  If one of the  parties to a  reorganization  or  short-form  merger is
          directly or indirectly  controlled  by, or under common  control with,
          another party to the reorganization or short-form merger,  subdivision
          (a)  shall  not  apply to any  shareholder  of such  party who has not
          demanded  payment of cash for such  shareholder's  shares  pursuant to
          this chapter;  but if the shareholder  institutes any action to attack
          the validity of the reorganization or short-form merger or to have the
          reorganization  or  short-form  merger  set  aside or  rescinded,  the
          shareholder  shall not thereafter  have any right to demand payment of
          cash for the shareholder's  shares pursuant to this chapter. The court
          in any action attacking the validity of the  reorganization  or short-
          form merger or to have the  reorganization  or  short-form  merger set
          aside or rescinded  shall not restrain or enjoin the  consummation  of
          the  transaction  except upon 10 days' prior notice to the corporation
          and upon a  determination  by the court that  clearly no other  remedy
          will adequately  protect the  complaining  shareholder or the class of
          shareholders of which such shareholder is a member.

     (c)  If one of the  parties to a  reorganization  or  short-form  merger is
          directly or indirectly  controlled  by, or under common  control with,
          another  party to the  reorganization  or  short-form  merger,  in any
          action to attack the  validity  of the  reorganization  or  short-form
          merger or to have the reorganization or short-form merger set aside or
          rescinded,  (1) a party to a reorganization or short-form merger which
          controls  another  party to the  reorganization  or short- form merger
          shall  have the  burden of proving  that the  transaction  is just and
          reasonable as to the  shareholders of the controlled  party, and (2) a
          person who controls two or more parties to a reorganization shall have
          the burden of proving that the  transaction  is just and reasonable as
          to the share-holders of any party so controlled. (Added by Stats.1975,
          c. 682,  ss. 7, eff.  Jan. 1, 1977.  Amended  Stats.1976,  c. 641, ss.
          22.5, eff. Jan. 1, 1977; Stats.1988, c. 919, ss. 9.)



                                       7.

<PAGE>



<PAGE>



                                   APPENDIX D


                             IBEX TECHNOLOGIES, INC.

                             1992 STOCK OPTION PLAN


     1. Purposes of the Plan.
        
     The  purposes of this Stock  Option Plan are to attract and retain the best
available  personnel for  positions of  substantial  responsibility,  to provide
additional  incentives to Employees,  Non-Employee  Directors and Consultants of
the Company and its  Subsidiaries,  and to promote the success of the  Company's
business.  Options  granted  hereunder may be either  Incentive Stock Options or
Nonstatutory Stock Options at the discretion of the Committee.  This is intended
to be a stock option plan for purposes of Section 408 of the California  General
Corporation Law.

     2. Definitions.

     As  used  herein,  and in  any  Option  granted  hereunder,  the  following
definitions shall apply:

     (a)  "Board" shall mean the Board of Directors of the Company.

     (b)  "Code" shall mean the Internal Revenue Code of 1986, as amended.

     (c)  "Common Stock" shall mean the Common Stock of the Company.

     (d)  "Company"   shall  mean  Ibex   Technologies,   Inc.,   a   California
          corporation.

     (e)  "Committee"  shall  mean  the  Committee  appointed  by the  Board  in
          accordance  with  paragraph (a) of Section 4 of the Plan. If the Board
          does  not  appoint  or  ceases  to  maintain  a  Committee,  the  term
          "Committee" shall refer to the Board.

     (f)  "Consultant" shall mean any independent contractor retained to perform
          services for the Company or any Subsidiary.

     (g)  "Continuous  Employment" shall mean the absence of any interruption or
          termination of service as an Employee or Non-Employee  Director by the
          Company  or  any  Subsidiary.   Continuous  Employment  shall  not  be
          considered interrupted during any period of sick leave, military leave
          or any other leave of absence  approved by the Board or in the case of
          transfers  between locations of the Company or between the Company and
          any Parent, Subsidiary or successor of the Company.



<PAGE>



     (h)  "Disinterested  Person"  shall  mean a person  who has not at any time
          within  one year prior to  service  as a member of the  Committee  (or
          during such service)  been granted or awarded  Options or other equity
          securities  pursuant  to the Plan or any other plan of the  Company or
          any Parent or Subsidiary.  Notwithstanding the foregoing,  a member of
          the  Committee  shall  not fail to be a  Disinterested  Person  merely
          because he or she  participates in a plan meeting the  requirements of
          Rule 16b-3(c)(2)(i)(A) or (B) promulgated under the Exchange Act.

     (i)  "Employee" shall mean any person,  including  officers (whether or not
          they are directors), employed by the Company or any Subsidiary.

     (j)  "Exchange  Act" shall mean the  Securities  Exchange  Act of 1934,  as
          amended.

     (k)  "Incentive Stock Option" shall mean any option granted under this Plan
          and any other  option  granted to an Employee in  accordance  with the
          provisions of Section 422 of the Code, and the regulations promulgated
          thereunder.

     (l)  "Non-Employee  Director" shall mean any director of the Company or any
          Subsidiary who is not employed by the Company or such Subsidiary.

     (m)  "Nonstatutory  Stock  Option"  shall mean an Option  granted under the
          Plan  that is  subject  to the  provisions  of  Section  1.83-7 of the
          Treasury Regulations promulgated under Section 83 of the Code.

     (n)  "Option" shall mean a stock option granted pursuant to the Plan.

     (o)  "Option  Agreement" shall mean a written agreement between the Company
          and the  Optionee  regarding  the grant and  exercise  of  Options  to
          purchase Shares and the terms and conditions  thereof as determined by
          the Committee pursuant to the Plan.

     (p)  "Optioned Shares" shall mean the Common Stock subject to an Option.

     (q)  "Optionee"  shall  mean  an  Employee,   Non-  Employee   Director  or
          Consultant who receives an Option.

     (r)  "Parent" shall mean a "parent  corporation,"  whether now or hereafter
          existing, as defined by Section 424(e) of the Code.

     (s)  "Plan" shall mean this 1992 Stock Option Plan.

                                       -2-

<PAGE>




     (t)  "Registration  Date"  shall  mean  the  effective  date  of the  first
          registration  statement filed by the Company pursuant to Section 12(g)
          of the Exchange Act with respect to any class of the Company's  equity
          securities.

     (u)  "Securities Act" shall mean the Securities Act of 1933, as amended.

     (v)  "Share"  shall mean a share of the Common Stock  subject to an Option,
          as adjusted in accordance with Section 11 of the Plan.

     (w)  "Subsidiary"  shall mean a  "subsidiary  corporation,"  whether now or
          hereafter existing, as defined in Section 424(f) of the Code.

     (x)  "Transfer  Agreement"  shall  have the  meaning  ascribed  thereto  in
          Section 9(b) hereof.

     3. Stock Subject to the Plan.

     Subject to the provisions of Section 11 of the Plan, the maximum  aggregate
number  of  Shares  which  may be  optioned  and sold  under  the Plan is twenty
thousand  (20,000)  Shares.  The  Shares  may  be  authorized  but  unissued  or
reacquired shares of Common Stock. If an Option expires or becomes unexercisable
for any reason  without  having been  exercised  in full,  the Shares which were
subject to the Option but as to which the Option was not exercised shall, unless
the Plan shall have been  terminated,  become  available for other Option grants
under the Plan.

     The  Company  intends  that as long as it is not  subject to the  reporting
requirements of Section 13 or 15(d) of the Exchange Act and is not an investment
company registered or required to be registered under the Investment Company Act
of 1940,  all offers and sales of Options and Shares  issuable  upon exercise of
any Option shall be exempt from  registration  under the provisions of Section 5
of the Securities Act, and the Plan shall be administered in such a manner so as
to preserve such exemption. The Company intends that the Plan shall constitute a
written  compensatory  benefit  plan within the meaning of Rule 701(b) of 17 CFR
Section 230.701  promulgated by the Securities and Exchange  Commission pursuant
to such Act. The Committee  shall designate which Options granted under the Plan
by the Company are intended to be granted in reliance on Rule 701.

     4. Administration of the Plan.

     (a)  Procedure.  The Plan shall be administered by the Board. The Board may
          appoint a Committee  consisting  of not less than three (3) members of
          the Board to administer the Plan, subject to such terms and conditions
          as the  Board may  prescribe.  Once  appointed,  the  Committee  shall
          continue to serve until otherwise  directed by the Board. From time to

                                      -3-
<PAGE>

          time,  the Board may  increase the size of the  Committee  and appoint
          additional members thereof, remove members (with or without cause) and
          appoint new members in substitution therefor, fill vacancies,  however
          caused,  and remove  all  members of the  Committee  and,  thereafter,
          directly administer the Plan.

          Members of the Board or Committee who are either  eligible for Options
          or have been  granted  Options may vote on any matters  affecting  the
          administration  of the Plan or the grant of  Options  pursuant  to the
          Plan,  except  that no such member  shall act upon the  granting of an
          Option to himself,  but any such member may be counted in  determining
          the existence of a quorum at any meeting of the Board or the Committee
          during which action is taken with respect to the granting of an Option
          to him or her.

          The Committee shall meet at such times and places and upon such notice
          as the  Chairperson  determines.  A majority  of the  Committee  shall
          constitute  a quorum.  Any acts by the  Committee  may be taken at any
          meeting at which a quorum is present and shall be by majority  vote of
          those  members  entitled to vote.  Additionally,  any acts  reduced to
          writing or approved in writing by all of the members of the  Committee
          shall be valid acts of the Committee.

     (b)  Procedure  After  Registration  Date.  Notwithstanding  subsection (a)
          above, after the date of registration of the Company's Common Stock on
          a national  securities  exchange or the  Registration  Date,  the Plan
          shall be administered either by: (i) the full Board, provided that all
          members of the Board are Disinterested Persons; or (ii) a Committee of
          three (3) or more directors,  each of whom is a Disinterested  Person.
          After  such  date,  the  Board  shall  take all  action  necessary  to
          administer the Plan in accordance  with the then effective  provisions
          of Rule 16b-3  promulgated  under the Exchange Act,  provided that any
          amendment to the Plan  required for  compliance  with such  provisions
          shall be made  consistent  with the  provisions  of  Section 13 of the
          Plan, and said regulations.

     (c)  Powers of the  Committee.  Subject to the  provisions of the Plan, the
          Committee shall have the authority:  (i) to determine,  upon review of
          relevant information,  the fair market value of the Common Stock; (ii)
          to  determine  the  exercise  price  of  Options  to be  granted,  the
          Employees,  Directors or  consultants to whom and the time or times at
          which  Options  shall be  granted,  and the  number  of  Shares  to be
          represented  by each  Option;  (iii) to  interpret  the Plan;  (iv) to
          prescribe,  amend and rescind  rules and  regulations  relating to the
          Plan; (v) to determine the terms and provisions of each Option granted

                                      -4-
<PAGE>

          under the Plan (which need not be identical)  and, with the consent of
          the holder thereof,  to modify or amend any Option;  (vi) to authorize
          any person to execute on behalf of the Company any instrument required
          to  effectuate  the  grant  of an  Option  previously  granted  by the
          Committee;  (vii)  defer an  exercise  date of any  Option  (with  the
          consent of the Optionee), subject to the provisions of Section 9(a) of
          the Plan;  (viii) to determine  whether Options granted under the Plan
          will be Incentive Stock Options or Nonstatutory Stock Options; (ix) to
          make all other  determinations  deemed  necessary or advisable for the
          administration of the Plan; and (x) to designate which Options granted
          under the Plan will be issued in reliance on Rule 701.

     (d)  Effect of  Committee's  Decision.  All decisions,  determinations  and
          interpretations  of the  Committee  shall be final and  binding on all
          potential or actual Optionees,  any other holder of an Option or other
          equity security of the Company and all other persons.

     5. Eligibility.

     (a)  Persons  Eligible for Options.  Options  under the Plan may be granted
          only to  Employees,  Non-Employee  Directors or  Consultants  whom the
          Committee,  in its sole  discretion,  may designate from time to time.
          Incentive Stock Options may be granted only to Employees.  An Employee
          who has been granted an Option,  if he or she is  otherwise  eligible,
          may be granted an additional Option or Options. However, the aggregate
          fair market value  (determined  in accordance  with the  provisions of
          Section  8(a)  of the  Plan)  of the  Shares  subject  to one or  more
          Incentive Stock Options grants that are exercisable for the first time
          by an Optionee  during any calendar year (under all stock option plans
          of the  Company and its  Parents  and  Subsidiaries)  shall not exceed
          $100,000 (determined as of the grant date).

     (b)  No Right to Continuing  Employment.  Neither the establishment nor the
          operation  of the Plan shall  confer  upon any  Optionee  or any other
          person any right with respect to  continuation  of employment or other
          service  with  the  Company  or any  Subsidiary,  nor  shall  the Plan
          interfere  in any way with the right of the  Optionee  or the right of
          the Company (or any Parent or Subsidiary) to terminate such employment
          or service at any time.

     6. Term of Plan.  The Plan shall become  effective upon its adoption by the
Board or its  approval by vote of the holders of the  outstanding  shares of the
Company  entitled to vote on the  adoption of the Plan (in  accordance  with the
provisions  of Section 18 hereof),  whichever is earlier.  It shall  continue in
effect for a term of ten (10) years unless sooner terminated under Section 13 of
the Plan.



                                       -5-

<PAGE>



     7. Term of Option. Unless the Committee determines  otherwise,  the term of
each  Option  granted  under the Plan  shall be ten (10)  years from the date of
grant.  The term of the Option  shall be set forth in the Option  Agreement.  No
Incentive  Stock Option shall be  exercisable  after the  expiration of ten (10)
years from the date such Option is granted;  provided  that, no Incentive  Stock
Option  granted to any  Employee  who, at the date such Option is granted,  owns
(within the meaning of Section  425(d) of the Code) more than ten percent  (10%)
of the total combined voting power of all classes of stock of the Company or any
Parent or Subsidiary shall be exercisable after the expiration of five (5) years
from the date such Option is granted.

     8. Exercise Price and Consideration.

     (a)  Exercise  Price.  Except as  provided  in  subsection  (b) below,  the
          exercise  price for the  Shares to be issued  pursuant  to any  Option
          shall be such price as is determined by the Committee,  which shall in
          no event be less than: (i) in the case of Incentive Stock Options, the
          fair market value of such Shares on the date the Option is granted; or
          (ii) in the  case of  Nonstatutory  Stock  Options,  85% of such  fair
          market value;  provided that, in the case of any Optionee owning stock
          possessing  more than ten percent (10%) of the total  combined  voting
          power  of all  classes  of  stock  of the  Company  or any  Parent  or
          Subsidiary  of the Company,  the exercise  price shall be 110% of fair
          market  value on the date the Option is granted.  Fair market value of
          the Common  Stock shall be  determined  by the  Committee,  using such
          criteria as it deems relevant;  provided,  however, that if there is a
          public  market for the Common  Stock,  the fair market value per Share
          shall be the average of the last  reported bid and asked prices of the
          Common  Stock on the date of grant,  as  reported  in The Wall  Street
          Journal (or, if not so reported, as otherwise reported by the National
          Association of Securities Dealers Automated Quotation (NASDAQ) System)
          or, in the event the Common  Stock is listed on a national  securities
          exchange  (within the meaning of Section 6 of the Exchange  Act) or on
          the NASDAQ  National  Market System (or any successor  national market
          system), the fair market value per Share shall be the closing price on
          such  exchange on the date of grant of the Option,  as reported in The
          Wall Street Journal.

     (b)  Ten Percent  Shareholders.  No Option shall be granted to any Employee
          who, at the date such Option is granted,  owns  (within the meaning of
          Section  424(d) of the Code) more than ten percent  (10%) of the total
          combined  voting  power of all  classes of stock of the Company or any
          Parent or  Subsidiary,  unless the exercise price for the Shares to be
          issued pursuant to such Option is at least equal to 110 percent (110%)
          of the fair market  value of such Shares on the grant date  determined
          by the Committee in the manner set forth in subsection (a) above.

                                       -6-

<PAGE>




     (c)  Consideration.  The  consideration  to be paid for the Optioned Shares
          shall be  payment  in cash or by check  unless  payment  in some other
          manner,  including by promissory  note,  other shares of the Company's
          Common Stock or such other consideration and method of payment for the
          issuance of Optioned Shares as may be permitted under Sections 408 and
          409 of the California  General  Corporation  Law, is authorized by the
          Committee  at the time of the grant of the  Option.  Any cash or other
          property  received by the Company from the sale of Shares  pursuant to
          the Plan shall constitute part of the general assets of the Company.

     9. Exercise of Option.

     (a)  Vesting Period.  Any Option granted  hereunder shall be exercisable at
          such times and under such  conditions  as  determined by the Committee
          and as shall be permissible  under the terms of the Plan,  which shall
          be specified in the Option  Agreement  evidencing the Option.  Options
          granted under the Plan shall vest at a rate of at least twenty percent
          (20%) per year.

     (b)  Exercise  Procedures.  An Option shall be deemed to be exercised  when
          written  notice of such  exercise  has been  given to the  Company  in
          accordance  with the  terms of the  option  agreement  evidencing  the
          Option,  and full  payment  for the Shares  with  respect to which the
          Option is exercised has been received by the Company.

          Pursuant  to the terms of the  Option  Agreement,  the  Committee  may
          require that any Option may be exercised  only upon the execution of a
          Restricted Stock Transfer  Agreement (the "Transfer  Agreement") which
          gives the Company a right of first refusal in the Option Shares at the
          per  share  price  at which  the  Option  Shares  are  proposed  to be
          transferred.  The  right  of  first  refusal  shall  terminate  on the
          effective date of a firm commitment  public  offering  pursuant to the
          Securities Act of 1933, as amended, covering the offer and sale of the
          Company's  Common Stock for the account of the  Company.  The Transfer
          Agreement  shall contain such  provisions as the Committee may approve
          in its sole discretion.

          An Option  may not be  exercised  for  fractional  shares.  As soon as
          practicable  following  the  exercise  of an Option in the  manner set
          forth above,  the Company  shall issue or cause its transfer  agent to
          issue stock certificates representing the Shares purchased.  Until the
          issuance of such stock  certificates  (as evidenced by the appropriate
          entry on the books of the  Company  or of a duly  authorized  transfer
          agent of the  Company),  no right to vote or receive  dividends or any
          other rights as a stockholder shall exist with respect to the Optioned
          Shares  notwithstanding the exercise of the Option. No adjustment will
          be made for a dividend  or other  rights for which the record  date is

                                      -7-
<PAGE>

          prior to the date of the transfer by the Optionee of the consideration
          for the  purchase of the  Shares,  except as provided in Section 11 of
          the Plan.  After the  Registration  Date, the exercise of an Option by
          any person  subject to  short-swing  trading  liability  under Section
          16(b) of the  Exchange  Act shall be  subject to  compliance  with all
          applicable  requirements of Rule 16b-3(d) or (e) promulgated under the
          Exchange Act.

     (c)  Death of Optionee.  In the event of the death during the Option period
          of an  Optionee  who is at the time of his  death,  or was  within the
          ninety  (90)-day  period  immediately  prior  thereto,  an Employee or
          Non-Employee  Director,  and who was in Continuous  Employment as such
          from the date of the  grant of the  Option  until the date of death or
          termination,  the  Option may be  exercised,  at any time prior to the
          expiration  of the Option  period,  by the  Optionee's  estate or by a
          person who  acquired  the right to  exercise  the Option by bequest or
          inheritance,  but only to the extent of the accrued  right to exercise
          at the time of the termination or death, whichever comes first.

     (d)  Disability  of  Optionee.  In the event of the  disability  during the
          Option period of an Optionee who is at the time of such disability, or
          was within the ninety  (90)-day  period prior thereto,  an Employee or
          Non-Employee  Director,  and who was in Continuous  Employment as such
          from the date of the grant of the Option until the date of  disability
          or termination, the Option may be exercised at any time within one (1)
          year following the date of  disability,  but only to the extent of the
          accrued  right  to  exercise  at  the  time  of  the   termination  or
          disability,  whichever  comes first,  subject to the condition that no
          option shall be exercised after the expiration of the Option period.

     (e)  Termination  of  Status  as  Employee,   Non-  Employee   Director  or
          Consultant.   If  an  Optionee  shall  cease  to  be  an  Employee  or
          Non-Employee  Director for any reason other than  disability or death,
          or if an Optionee  shall cease to be  Consultant  for any reason,  the
          Optionee  may, but only within  ninety (90) days (or such other period
          of time as is  determined by the  Committee)  after the date he or she
          ceases to be an Employee or Non-Employee Director, exercise his or her
          Option to the extent that he or she was entitled to exercise it at the
          date of such  termination,  subject  to the  condition  that no option
          shall be exercisable after the expiration of the Option period.

     (f)  Exercise  of Option  With Stock  After  Registration  Date.  After the
          Registration Date, the Committee may permit an Optionee to exercise an
          Option by  delivering  shares of the Company's  Common  Stock.  If the
          Optionee is so permitted,  the option  agreement  covering such Option
          may include  provisions  authorizing  the  Optionee  to  exercise  the
          Option,  in whole or in part, by: (i)  delivering  whole shares of the
          Company's Common Stock  previously owned by such Optionee  (whether or

                                      -8-
<PAGE>

          not acquired  through the prior  exercise of a stock option)  having a
          fair  market  value  equal to the  aggregate  exercise  price  for the
          Optioned  Shares  issuable  on  exercise  of the  Option;  and/or (ii)
          directing the Company to withhold from the Shares that would otherwise
          be issued upon  exercise  of the Option  that  number of whole  Shares
          having a fair market value equal to the aggregate  exercise  price for
          the Optioned Shares issuable on exercise of the Option.  Shares of the
          Company's  Common Stock so  delivered  or withheld  shall be valued at
          their  fair  market  value  at the  close  of the  last  business  day
          immediately   preceding  the  date  of  exercise  of  the  Option,  as
          determined  by the  Committee,  in accordance  with the  provisions of
          Section 8(a) of the Plan.  Any balance of the exercise  price shall be
          paid in cash. Any shares delivered or withheld in accordance with this
          provision  shall not again become  available  for purposes of the Plan
          and for Options subsequently granted thereunder.

     (g)  Tax  Withholding.  After the  Registration  Date,  when an Optionee is
          required  to  pay  to  the  Company  an  amount  with  respect  to tax
          withholding  obligations in connection  with the exercise of an Option
          granted  under the Plan,  the Optionee may elect prior to the date the
          amount of such  withholding tax is determined (the "Tax Date") to make
          such payment, or such increased payment as the Optionee elects to make
          up to the  maximum  federal,  state  and  local  marginal  tax  rates,
          including any related FICA obligation,  applicable to the Optionee and
          the particular  transaction,  by: (i) delivering cash; (ii) delivering
          part or all of the payment in previously  owned shares of Common Stock
          (whether or not  acquired  through  the prior  exercise of an Option);
          and/or (iii)  irrevocably  directing  the Company to withhold from the
          Shares that would otherwise be issued upon exercise of the Option that
          number of whole Shares  having a fair market value equal to the amount
          of tax required or elected to be withheld (a "Withholding  Election").
          If an Optionee's Tax Date is deferred  beyond the date of exercise and
          the Optionee makes a Withholding Election, the Optionee will initially
          receive the full amount of Optioned  Shares  otherwise  issuable  upon
          exercise  of the  Option,  but will be  unconditionally  obligated  to
          surrender  to the  Company  on the  Tax  Date  the  number  of  Shares
          necessary to satisfy his or her minimum withholding  requirements,  or
          such  higher  payment  as he or she may have  elected  to  make,  with
          adjustments to be made in cash after the Tax Date.

          Any  withholding  of Optioned  Shares with respect to taxes arising in
          connection  with the  exercise  of an Option by any person  subject to
          short-swing  trading liability under Section 16(b) of the Exchange Act
          shall satisfy the following conditions:



                                       -9-

<PAGE>



          (i)  An advance election to withhold  Optioned Shares in settlement of
               a  tax   liability   must  satisfy  the   requirements   of  Rule
               16b-3(d)(1)(i), regarding participant- directed transactions;

          (ii) Absent such an election,  the  withholding of Optioned  Shares to
               settle a tax liability may occur only during the quarterly window
               period described in Rule 16b-3(e);

          (iii)Absent an advance  election or window-  period  withholding,  the
               Optionee  may deliver  shares of Common  Stock owned prior to the
               exercise  of an  Option to settle a tax  liability  arising  upon
               exercise of the Option, in accordance with Rule 16b-3(f); or

          (iv) The delivery of previously  acquired  shares of Common Stock (but
               not the  withholding  of newly  acquired  Shares) will be allowed
               where an election under Section 83(b) of the Code accelerates the
               Tax Date to a day that occurs less than six (6) months  after the
               advance  election and is not within the  quarterly  window period
               described in Rule 16b-3(e).

          Any adverse  consequences  incurred by an Optionee with respect to the
          use of shares of Common Stock to pay any part of the exercise price or
          of any tax in  connection  with the  exercise of an Option,  including
          without limitation any adverse tax consequences arising as a result of
          a disqualifying  disposition  within the meaning of Section 422 of the
          Code shall be the sole responsibility of the Optionee. Shares withheld
          in accordance with this provision shall not again become available for
          purposes of the Plan and for Options subsequently granted thereunder.

     10.  Non-Transferability  of Options.  An Option may not be sold,  pledged,
assigned,  hypothecated,  transferred or disposed of in any manner other than by
will or by the laws of descent and distribution and may be exercised, during the
lifetime of the Optionee, only by the Optionee.

     11.  Adjustments  Upon Changes in  Capitalization.  Subject to any required
action by the shareholders of the Company, the number of Optioned Shares covered
by each  outstanding  Option,  and the per  share  exercise  price of each  such
Option,  shall be  proportionately  adjusted for any increase or decrease in the
number of issued shares of Common Stock  resulting  from a stock split,  reverse
stock split, recapitalization,  combination,  reclassification, the payment of a
stock  dividend  on the Common  Stock or any other  increase  or decrease in the
number of such shares of Common Stock effected  without receipt of consideration
by the Company; provided, however, that conversion of any convertible securities
of the Company  shall not be deemed to have been  "effected  without  receipt of
consideration".  Such adjustment shall be made by the Board, whose determination

                                      -10-
<PAGE>

in that  respect  shall be final,  binding and  conclusive.  Except as expressly
provided  herein,  no issue by the  Company of shares of stock of any class,  or
securities  convertible into shares of stock of any class,  shall affect, and no
adjustment by reason  thereof shall be made with respect to, the number or price
of shares of Common Stock subject to an Option.

     The  Committee  may,  if it so  determines  in the  exercise  of  its  sole
discretion,  also make provision for adjusting the number or class of securities
covered by any Option,  as well as the price to be paid  therefor,  in the event
that the Company effects one or more reorganizations,  recapitalizations, rights
offerings,  or other increases or reductions of shares of its outstanding Common
Stock,  and in the event of the Company being  consolidated  with or merged into
any other corporation.

     Unless  otherwise   determined  by  the  Board,  upon  the  dissolution  or
liquidation  of the Company the Options  granted under the Plan shall  terminate
and thereupon  become null and void.  The Optionee  shall be given not less than
ten (10)  days  notice  of such  event  and the  opportunity  to  exercise  each
outstanding option before such event is effected.

     Upon any  merger or  consolidation,  if the  Company  is not the  surviving
corporation,  the Options  granted under the Plan shall either be assumed by the
new entity or shall terminate in accordance with the provisions of the preceding
paragraph.

     12. Time of Granting Options.  Unless otherwise specified by the Committee,
the date of grant of an  Option  under  the Plan  shall be the date on which the
Committee  makes  the  determination   granting  such  Option.   Notice  of  the
determination  shall be given to each  Optionee  to whom an Option is so granted
within a reasonable time after the date of such grant.

     13. Amendment and Termination of the Plan.

     The  Board  may  amend  or  terminate  the Plan  from  time to time in such
respects as the Board may deem advisable,  except that,  without approval of the
holders of a majority  of the  outstanding  capital  stock no such  revision  or
amendment  shall  change  the number of Shares  subject to the Plan,  change the
designation  of the class of  employees  eligible to receive  Options or add any
material  benefit to Optionees under the Plan. Any such amendment or termination
of the Plan shall not affect  Options  already  granted,  and such Options shall
remain  in full  force  and  effect  as if the  Plan  had not  been  amended  or
terminated.



                                      -11-

<PAGE>


     14.  Conditions  Upon  Issuance of Shares.  Shares shall not be issued with
respect to an Option  granted  under the Plan unless the exercise of such Option
and the issuance and delivery of such Shares pursuant  thereto shall comply with
all relevant  provisions of law, including,  without limitation,  the Securities
Act, the Exchange Act, the rules and regulations promulgated thereunder, and the
requirements of any stock exchange upon which the Shares may then be listed, and
shall be further subject to the approval of counsel for the Company with respect
to such compliance. As a condition to the exercise of an Option, the Company may
require the person  exercising  such Option to represent and warrant at the time
of any such exercise that the Shares are being purchased only for investment and
without  any  present  intention  to sell or  distribute  such Shares if, in the
opinion of counsel for the Company,  such a representation is required by any of
the aforementioned relevant provisions of law.

     15. Reservation of Shares. During the term of this Plan the Company will at
all times reserve and keep available the number of Shares as shall be sufficient
to satisfy the requirements of the Plan. Inability of the Company to obtain from
any regulatory body having  jurisdiction  and authority  deemed by the Company's
counsel to be necessary to the lawful issuance and sale of any Shares  hereunder
shall relieve the Company of any liability in respect of the nonissuance or sale
of such  Shares  as to which  such  requisite  authority  shall  not  have  been
obtained.

     16.  Information  to Optionee.  During the term of any Option granted under
the Plan, the Company shall provide or otherwise make available to each Optionee
a copy of its financial statements at least annually.

     17. Option Agreement.  Options granted under the Plan shall be evidenced by
Option Agreements.

     18.  Shareholder  Approval.  The Plan shall be subject to  approval  by the
affirmative  vote of the holders of a majority of the outstanding  capital stock
of the Company  entitled to vote within  twelve (12) months  before or after the
Plan is adopted.  Any option exercised before  shareholder  approval is obtained
must be rescinded if  shareholder  approval is not obtained  within  twelve (12)
months  before or after the Plan is adopted.  Shares issued upon the exercise of
such  options  shall not be counted in  determining  whether  such  approval  is
obtained. Any amendments to the Plan which require shareholder approval shall be
by the affirmative vote of the holders of a majority of the outstanding  capital
stock of the Company entitled to vote.



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