CASTELLE \CA\
DEF 14A, 1998-03-30
COMPUTER PERIPHERAL EQUIPMENT, NEC
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                            SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934
                                (Amendment No. )

Filed by the Registrant                           (x)
Filed by a Party other than the Registrant        ( )

Check the appropriate box:

( )     Preliminary Proxy Statement
( )     Confidential,  for Use of the  Commission  Only (as permitted by Rule
        14a-6(e)(2))
(x)     Definitive Proxy Statement
( )     Definitive Additional Materials
( )     Soliciting  Material  Pursuant  to Section  240.14a-11(c)  or Section
        240.14a-12

                                    CASTELLE
- - --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)

- - --------------------------------------------------------------------------------
     (Name of Person(s) Filing Proxy Statement if Other Than the Registrant)

Payment of Filing Fee (Check the appropriate box)

(x)     No fee required.
( )     Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

1. Title of each class of securities to which transaction applies:

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

2. Aggregate number of securities to which transaction applies:

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

3. Per unit price or other underlying value of transaction  computed pursuant to
   Exchange  Act Rule 0-11  (Set  forth the  amount on which the  filing  fee is
   calculated and state how it was determined):

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

4. Proposed maximum aggregate value of transaction:

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

5. Total fee paid:

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


( )   Fee paid previously with preliminary materials.

( )   Check box if any part of  the fee is offset as provided  by  Exchange  Act
      Rule  0-11(a)(2)  and identify the filing for which the offsetting fee was
      paid  previously.  Identify the previous filing by registration  statement
      number, or the Form or Schedule and the date of its filing.

6. Amount Previously Paid:

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

7. Form, Schedule or Registration Statement No.:

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

8. Filing Party:

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

9. Date Filed:

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

<PAGE>

                                    CASTELLE
                             3255-3 SCOTT BOULEVARD
                             SANTA CLARA, CALIFORNIA


                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

                          TO BE HELD ON APRIL 29, 1998

 TO THE SHAREHOLDERS OF CASTELLE:

        Notice is hereby  given  that the  Annual  Meeting  of  Shareholders  of
 CASTELLE, a California corporation (the "Company"),  will be held on Wednesday,
 April 29, 1998 at  10:00a.m.  local time at the  Company's  corporate  offices,
 located at 3255-3 Scott  Boulevard,  Santa Clara,  California for the following
 purposes:

 1.  To elect directors to serve for the ensuing year and until their successors
     are elected.

 2.  To approve the Company's 1988 Incentive Stock Plan, as amended, to increase
     the  aggregate  number of shares of Common  Stock  authorized  for issuance
     under such plan by 981,935  shares and to add  provisions  with  respect to
     Section 162(m) of the Internal Revenue Code of 1986, as amended.

 3.  To ratify the selection of Coopers & Lybrand LLP as independent auditors of
     the Company for its fiscal year ending December 31, 1998.

 4.  To transact such other  business as may properly come before the meeting or
     any adjournment or postponement thereof.

     The  foregoing  items of  business  are more fully  described  in the Proxy
     Statement accompanying this Notice.

          The Board of  Directors  has fixed the close of  business on March 19,
     1998, as the record date for the determination of shareholders  entitled to
     notice of and to vote at this  Annual  Meeting  and at any  adjournment  or
     postponement thereof.



                                          By Order of the Board of Directors

                                          /s/ Randall I. Bambrough

                                          RANDALL I. BAMBROUGH
                                          Secretary


Santa Clara, California
April 1, 1998

     All  Shareholders  are  cordially  invited to attend the meeting in person.
Whether or not you expect to attend the meeting, please complete, date, sign and
return the  enclosed  proxy as  promptly  as  possible  in order to ensure  your
representation  at the meeting.  A return  envelope (which is postage prepaid if
mailed in the United  States) is  enclosed  for that  purpose.  Even if you have
given your proxy, you may still vote in person if you attend the meeting. Please
note, however, that if your shares are held of record by a broker, bank or other
nominee  and you wish to vote at the  meeting,  you must  obtain from the record
holder a proxy issued in your name.

<PAGE>
                                    CASTELLE
                             3255-3 SCOTT BOULEVARD
                             SANTA CLARA, CALIFORNIA

                                 PROXY STATEMENT
                       FOR ANNUAL MEETING OF SHAREHOLDERS

                                 April 29, 1998

                 INFORMATION CONCERNING SOLICITATION AND VOTING

GENERAL

         The  enclosed  proxy is  solicited  on behalf of the Board of Directors
(the "Board") of CASTELLE, a California corporation (the "Company"),  for use at
the Annual Meeting of  Shareholders  to be held on April 29, 1998, at 10:00 a.m.
local  time  (the  "Annual  Meeting"),  or at any  adjournment  or  postponement
thereof,  for the purposes set forth  herein and in the  accompanying  Notice of
Annual  Meeting.  The Annual  Meeting  will be held at the  Company's  corporate
offices, located at 3255-3 Scott Boulevard,  Santa Clara California. The Company
intends to mail this proxy  statement  and  accompanying  proxy card on or about
April 1, 1998, to all shareholders entitled to vote at the Annual Meeting.

SOLICITATION

         The  Company  will bear the entire  cost of  solicitation  of  proxies,
including preparation,  assembly,  printing and mailing of this proxy statement,
the proxy and any additional  information  furnished to shareholders.  Copies of
solicitation materials will be furnished to banks, brokerage houses, fiduciaries
and custodians  holding in their names shares of Common Stock beneficially owned
by others to  forward to such  beneficial  owners.  The  Company  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 or
personal  solicitation by directors,  officers or other regular employees of the
Company. No additional compensation will be paid to directors, officers or other
regular employees for such services.

VOTING RIGHTS AND OUTSTANDING SHARES

         Only  holders  of record of Common  Stock at the close of  business  on
March 19, 1998 will be entitled to notice of and to vote at the Annual  Meeting.
At the close of  business on March 19,  1998 the  Company  had  outstanding  and
entitled to vote 4,493,425 shares of Common Stock.

         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 four
(4) 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.

REVOCABILITY OF PROXIES

         Any person giving a proxy pursuant to this  solicitation  has the power
to revoke it at any time  before it is voted.  It may be revoked by filing  with
the Secretary of the Company at the Company's principal executive office, 3255-3
Scott Boulevard,  Santa Clara,  California 95054, a written notice of revocation
or a duly executed proxy bearing a later date, or it may be revoked by attending
the meeting and voting in person. Attendance at the meeting will not, by itself,
revoke a proxy.
 <PAGE>

SHAREHOLDER PROPOSALS

         Proposals  of  shareholders  that are  intended to be  presented at the
Company's  1999 Annual Meeting of  Shareholders  must be received by the Company
not later than  December 2, 1998 in order to be included in the proxy  statement
and proxy relating to that Annual Meeting.





<PAGE>


                                   PROPOSAL 1

                              ELECTION OF DIRECTORS


         There  are  four  nominees  for  the  four  Board  positions  presently
authorized in the Company'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 the Company, three
having been elected by the  shareholders,  and one director,  Robert  Hambrecht,
having been elected by the Board.

         Shares  represented by executed  proxies will be voted, if authority to
do so is not  withheld,  for the  election  of the four  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 four candidates  receiving the highest number of affirmative  votes
cast at the meeting will be elected directors of the Company.

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

Identification of Directors

         The names of the  nominees and certain  information  about them are are
set forth below:
<TABLE>
<CAPTION>

        Name           Age               Position
<S>                   <C>    <C>
 Arthur H. Bruno       64   Chairman of the Board, Chief Executive Officer
                            and Director
 John Freidenrich (1)  60   General Partner, Bay Management and Bay Management
                            IV, L.P.
 Robert Hambrecht      31   Partner and Director of Distribution,
                            W.R. Hambrecht & Company
 Alan Kessman (1)      51   Chairman of the Board, President and Chief Executive
                            Officer of Executone Information Systems, Inc.
</TABLE>

 ---------------
  (1)Member of the Audit Committee of the Board of Directors.


Arthur H. Bruno

     Mr. Bruno has served as the  Company's  Chairman of the Board since October
     1993, was Chief Executive  Officer from October 1993 through April 1997 and
     has  served  as such  from  November  1997 to the  present.  He  served  as
     President  from October 1993 through April 1997.  From February 1996 to the
     present he has  served as the  Chairman  of the Board and as a director  of
     Ashlar, a privately-held maker of computer-aided design software. From 1991
     to 1993,  he was  Chairman  of the Board of White  Pine  Software  Inc.,  a
     desktop connectivity company. From 1989 to 1991, he was the Chairman of the
     Board  and  Chief  Executive   Officer  of  Wellsley   Medical   Management
     Corporation, a primary care medical service provider. From 1986 to 1989, he
     was the  Chairman  of the  Board  and  Chief  Executive  Officer  of Visual
     Technology  Incorporated,  the  predecessor to White Pine Software Inc. Mr.
     Bruno has served as a director of White Pine Software,  Inc. since February
     1994 and is also a director of several privately held companies.

John Freidenrich

     Mr. Freidenrich has served as a director of the Company 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 1968
     through 1991.



<PAGE>


Robert Hambrecht

     Mr.  Hambrecht has served as a director of the Company since March 1998. He
     has been a partner  and  Director  of  Distribution  for W.R.  Hambrecht  &
     Company,  an  investment  banking firm,  since  January 1998,  and was Vice
     President of H&Q Venture Partners,  a venture capital firm, from April 1996
     through  January  1998.  From January 1994 to March 1996 Mr.  Hambrecht was
     employed by Unterberg Harris, an investment  banking firm, most recently as
     an associate.  Mr. Hambrecht  attended  Columbia  University from September
     1991  through  December  1993 where he earned a  master's  degree in public
     administration. Mr. Hambrecht also serves on the Board of Directors of four
     privately-held companies.

Alan Kessman

     Mr.  Kessman has served as a director of the Company  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 1988.

BOARD COMPOSITION

         In connection with his  resignation as the Chief Executive  Officer and
President of Castelle in November 1997, Mr. Prasad also resigned his position as
a director of the  Company.  Mr.  Rekhi,  a director of the Company  since 1995,
resigned  from the Board in December  1997.  As a result of these  actions,  the
Board reduced the number of Board positions from five to four and elected Mr.
Hambrecht to fill the vacancy existing on the Board.

BOARD COMMITTEES AND MEETINGS

         During the fiscal year ended  December  31, 1997 the Board of Directors
held eleven meetings. The Board has an Audit Committee.

         The Audit  Committee meets with the Company'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.  Freidenrich  and  Kessman.  It met four times
during the year.

         During the year ended December 31, 1997, each Board member attended 75%
or more of the  aggregate of the  meetings of the Board and of the  committee on
which he served, held during the period for which he was a director or committee
member, respectively.





<PAGE>


                                   PROPOSAL 2

                           1988 EQUITY INCENTIVE PLAN


         In April 1988,  the Board of Directors  adopted,  and the  shareholders
subsequently approved, the Company's 1988 Equity Incentive Plan (the ("Incentive
Plan").  As a result of a series of  amendments,  at March 31,  1997  there were
945,582 shares of the Company's  Common Stock  authorized for issuance under the
Incentive Plan.

         In April 1997, the Board  approved an amendment to the Incentive  Plan,
subject to  shareholder  approval,  to enhance the  flexibility  of the Board in
granting stock awards to the Company's  employees.  The amendment  increases the
number of shares  authorized  for issuance under the Incentive Plan from a total
of 945,582  shares to 1,927,517  shares.  The Board  adopted  this  amendment to
ensure that the Company can  continue  to grant  stock  awards to  employees  at
levels determined appropriate by the Board.

         The Board also  amended  the  Incentive  Plan,  subject to  shareholder
approval,  generally to permit the Company, under Section 162(m) of the Internal
Revenue Code of 1986, as amended (the "Code"),  to continue to be able to deduct
as a business expense certain compensation attributable to the exercise of stock
options granted under the Incentive  Plan.  Section 162(m) denies a deduction to
any  publicly  held  corporation  for  certain  compensation  paid to  specified
employees  in a  taxable  year  to the  extent  that  the  compensation  exceeds
$1,000,000 for any covered employee.  See "Federal Income Tax Information" below
for a discussion of the application of Section  162(m).  In light of the Section
162(m)  requirements,  the Board has  amended  the  Incentive  Plan,  subject to
shareholder  approval, to include a limitation providing that no employee may be
granted  options under the Incentive  Plan during a calendar year to purchase in
excess of 400,000 shares of Common Stock. Previously,  no such formal limitation
was placed on the number of shares  available  for option grants to an employee.
In addition, the Incentive Plan was amended, subject to shareholder approval, to
provide that, in the Board's discretion,  directors who grant options to covered
employees  generally will be "outside  directors" as defined in Section  162(m).
For a description of this requirement,  see  "Administration." In addition,  the
Board made some minor amendments to the Incentive Plan in order to conform it to
the current  requirement  of Section 16 of the  Securities  and  Exchange Act of
1934, as amended, which do not require shareholder approval.

         At March 19, 1998,  restricted  stock purchase awards of 281,120 shares
of the Company's  Common Stock and options (net of cancelled or expired options)
covering an aggregate of 1,094,813 shares of the Company's Common Stock had been
granted under the Incentive Plan, and 551,584 shares (plus any shares that might
in the  future  be  returned  to the  plans  as a  result  of  cancellations  or
expiration  of options or the  repurchase  of unvested  restricted  stock by the
Company)  remained  available for future grant under the Incentive Plan.  During
the year ended  December 31, 1997,  under the  Incentive  Plan,  the Company has
granted to all executive  officers as a group options to purchase 630,000 shares
at  exercise  prices of $4.50 to $5.75 per share,  to all  employees  (excluding
executive  officers) as a group options to purchase  554,370  shares at exercise
prices of $4.50 to $5.75 per share and made no grants to non-employee directors.

         Shareholders  are requested in this Proposal 2 to approve the Incentive
Plan, as amended.  If the shareholders  fail to approve this Proposal 2, certain
options  granted under the Incentive Plan will not qualify as  performance-based
compensation  and, in some  circumstances,  the Company may be denied a business
expense deduction for compensation recognized in connection with the exercise of
these stock options.  The  affirmative  vote of the holders of a majority of the
shares  present in person or represented by proxy and voting at the meeting will
be required to approve the Incentive Plan, as amended.

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

         The essential features of the Incentive Plan are outlined below:

GENERAL

         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 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
<PAGE>

"Federal  Income Tax  Information"  for a discussion of the tax treatment of the
various awards included in the Incentive Plan.

PURPOSE

         The  Incentive  Plan provides a means by which  selected  employees and
directors of, and consultants to, the Company, and its affiliates,  may be given
an opportunity to purchase Common Stock of the Company. The Company, by means of
the  Incentive  Plan,  seeks to  retain  the  services  of  persons  who are now
employees of or  consultants or directors to the Company or its  affiliates,  to
secure and retain the services of new employees,  directors and consultants, and
to provide  incentives for such persons to exert maximum efforts for the success
of the Company and its affiliates.

FORMS OF BENEFIT

         The Incentive Plan provides for incentive  stock options,  nonstatutory
stock options,  restricted stock purchase awards and stock bonuses (collectively
"Stock Awards").

ADMINISTRATION

         The Incentive  Plan is  administered  by the Board unless and until the
Board  delegates  administration  to a  committee  composed of two or more Board
members, all of the members of which committee may be non-employee directors (as
such term is defined in Rule 16b-3 promulgated under the Securities Exchange Act
of 1934, as amended (the "Exchange Act") and/or outside  directors (as such term
is defined in the Treasury  regulations  promulgated under Section 162(m) of the
Internal Revenue Code of 1986, as amended (the "Code")).  If  administration  is
delegated to a committee,  such  committee  will have,  in  connection  with the
administration  of the  Incentive  Plan,  the  powers  possessed  by the  Board,
subject,  however, to such resolutions,  not inconsistent with the provisions of
the Incentive Plan, as may be adopted from time to time by the Board.  The Board
or the committee may delegate to a committee of one or more members of the Board
the authority to grant Stock Awards to eligible persons who are not then subject
to Section 16 of the Exchange  Act and/or who are either (i) not then  employees
covered by Code  Section  162(m) and are not  expected  to be covered by Section
162(m) at the time of recognition of income  resulting from such Stock Award, or
(ii)  not  persons  with  respect  to whom  the  Company  wishes  to  avoid  the
application of Section 162(m).  The Board may abolish such committee at any time
and revest in the Board the administration of the Incentive Plan.

         The  Board has the power to  determine  from time to time  which of the
persons  eligible under the Incentive Plan shall be granted awards,  the type of
awards to be granted,  when and how each award shall be granted, to construe and
interpret  the  Incentive  Plan and awards  granted  under it, and to establish,
amend and revoke rules and  regulations  for its  administration.  The Board may
correct any defect in the Incentive  Plan or in any award  agreement to make the
Incentive Plan fully effective.

SHARES SUBJECT TO THE PLAN

         The  Common  Stock  that  may be sold  pursuant  to  awards  under  the
Incentive  Plan  shall  not  exceed  in the  aggregate  1,927,517  shares of the
Company's  Common Stock. If any stock option expires or terminates,  in whole or
in part,  without having been  exercised in full, the stock not purchased  under
such award will revert to and again  become  available  for  issuance  under the
Incentive Plan. Any shares of the Company's  Common Stock which are subject to a
repurchase or reacquisition right in favor of the Company, which are repurchased
or reacquired by the Company pursuant to the terms of such rights,  shall revert
to and again become  available for issuance under the Incentive Plan. The Common
Stock subject to the Incentive Plan may be unissued  shares or treasury  shares,
bought on the market or otherwise.

ELIGIBILITY

         Incentive stock options may be granted only to employees.  Nonstatutory
stock options, restricted stock purchase awards and stock bonuses may be granted
only to employees, directors or consultants.

         No person is eligible for the grant of an incentive stock option if, at
the time of grant, such person owns stock possessing more than ten percent (10%)
of the total combined voting power of all classes of stock of the Company unless
the exercise  price of such option is at least one hundred ten percent (110%) of
the fair market value of such Common Stock  subject to the option at the date of
grant and the option is not  exercisable  after the expiration of five (5) years
from the date of grant.  In addition,  no person shall be eligible to be granted
options  covering  more  than  four  hundred  thousand  (400,000)  shares of the
Company's Common Stock in any calendar year. 
<PAGE>

TERM AND TERMINATION

         No option is  exercisable  after the  expiration of ten (10) years from
the date it was granted.

         In the event an optionee's  continuous status as an employee,  director
or consultant is terminated, the optionee may exercise his or her option (to the
extent that the optionee was entitled to exercise it at the time of termination)
but only  within  the  earlier  of (i) the  date  three  (3)  months  after  the
termination  of the  optionee's  continuous  status as an employee,  director or
consultant, or (ii) the expiration of the term of the option as set forth in the
option agreement.

         In the event an optionee's  continuous status as an employee,  director
or consultant terminates as a result of the optionee's disability,  the optionee
may exercise his or her option, but only within the period ending on the earlier
of (i) twelve (12) months  following such termination (or such longer or shorter
period as specified in the option  agreement) or (ii) the expiration of the term
of the option as set forth in the option agreement.

         In the event an optionee's  continuous status as an employee,  director
or consultant  terminates  as a result of the  optionee's  death the  optionee's
estate, heirs or beneficiaries may exercise his or her option, but only with the
period  ending  on the  earlier  of (i)  eighteen  (18)  months  following  such
termination  (or such  longer or  shorter  period  as  specified  in the  option
agreement) or (ii) the  expiration of the term of the option as set forth in the
option agreement.

         In the event a stock bonus or restricted stock  recipient's  continuous
status as an  employee,  director  or  consultant  terminates,  the  Company may
repurchase or otherwise reacquire any or all of the shares of stock held by that
person  which have not vested as of the date of  termination  under the terms of
the stock bonus or restricted stock purchase  agreement  between the Company and
such person.

EXERCISE PRICE

         The exercise price of each incentive stock option will not be less than
one hundred  percent  (100%) of the fair market  value of the  Company's  Common
Stock on the date of grant. The exercise price of each nonstatutory stock option
will not be less than eighty-five  percent (85%) of the fair market value on the
date of grant.  The purchase  price of restricted  stock shall be such amount as
the Board  shall  determine  and  designate  in the  restricted  stock  purchase
agreement.  Stock  bonuses  may be awarded in  consideration  for past  services
actually rendered to the Company or for its benefit.

CONSIDERATION

         The purchase price of stock acquired  pursuant to a Stock Award is paid
either in cash at the time of exercise or  purchase,  or (if  determined  by the
Board  at the  time of  grant  for an  option)  by  deferred  payment  or  other
arrangement or in any other form of legal  consideration  that may be acceptable
to the Board.  Additionally,  in the case of an option and in the  discretion of
the Board at the time of the grant of an option,  by  delivery to the Company of
other  Common  Stock  of the  Company.  In the  case  of  any  deferred  payment
arrangement,  interest will be payable at least  annually and will be charged at
the minimum  rate of interest  necessary  to avoid the  treatment as interest of
amounts that are not stated to be interest.

TRANSFERABILITY

         An incentive stock option will not be transferable except by will or by
the laws of  descent  and  distribution,  and shall be  exercisable  during  the
lifetime of the person to whom the  incentive  stock  option is granted  only by
such person. A nonstatutory stock option, stock bonus, or restricted stock award
generally will not be transferable  except by will or by the laws of descent and
distribution or pursuant to a domestic relations order; provided;  however, that
a nonstatutory  stock option may be made transferable for certain limited estate
planning purposes.  In addition, an optionee may designate a beneficiary who may
exercise his or her option after death.

VESTING

         The total number of shares of stock  subject to an option may, but need
not, be allotted in periodic installments. The option agreement may provide that
from time to time during each of such installment periods, the option may become
exercisable  ("vest") with respect to some or all of the shares allotted to that
period,  and may be exercised with respect to some or all of the shares allotted
to such period  and/or any prior period as to which the option became vested but
was not fully exercised.  The option agreement may also provide that an optionee
may exercise an option prior to full vesting, provided that the Company may have
a repurchase right with respect to any unvested shares.

 <PAGE>

         Restricted  stock purchase  awards and stock bonuses  granted under the
Incentive  Plan may be granted  pursuant to a repurchase  option in favor of the
Company in accordance with a vesting schedule determined by the Board.

ADJUSTMENTS UPON CHANGES IN STOCK

         If any change is made in the  Common  Stock  subject  to the  Incentive
Plan, or subject to any Stock Award,  without  receipt of  consideration  by the
Company (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 class(es) and maximum number of shares subject to
the Incentive Plan, the maximum annual award applicable under the Incentive Plan
and the  class(es)  and number of shares and price per share of stock subject to
outstanding Stock Awards will be appropriately adjusted.

         In the event of a merger,  consolidation,  liquidation,  dissolution or
the sale of substantially all of the Company's assets, any surviving corporation
shall  assume any Stock Awards  outstanding  under the  Incentive  Plan or shall
substitute similar awards for those outstanding under the Incentive Plan or such
Stock Awards shall  continue in full force and effect.  In the event a surviving
corporation  refuses to assume such Stock Awards or substitute  similar  awards,
then, with respect to stock awards held by persons then  performing  services as
employees, directors or consultants, the time during which such Stock Awards may
be exercised  shall be accelerated  prior to completion of such  transaction and
such Stock Awards  terminated if not  exercised  prior to such  transaction.  An
optionee's option agreement may include additional  provisions which address the
handling of such option upon the  occurrence of a transaction  described  above;
provided,  however,  that any such  additional  provisions  shall not  impair or
reduce the rights of the optionee.

AMENDMENT OF THE INCENTIVE PLAN

         The Board at any time,  and from time to time,  may amend the Incentive
Plan.   However,  no  amendment  shall  be  effective  unless  approved  by  the
shareholders  of the  Company  within  twelve  (12)  months  before or after the
adoption of the  amendment,  where the  amendment  will  increase  the number of
shares reserved for issuance under the Incentive Plan,  modify the  requirements
as to eligibility  for  participation  or in any other way if such  modification
requires  shareholder  approval in order for the  Incentive  Plan to satisfy the
requirements  of  Section  422 of the Code,  Rule  16b-3  promulgated  under the
Exchange Act, or any Nasdaq or securities exchange  requirements.  The Board may
in its sole  discretion  submit any other  amendment to the  Incentive  Plan for
shareholder approval.

TERMINATION OR SUSPENSION OF THE INCENTIVE PLAN

         The Board may  suspend or  terminate  the  Incentive  Plan at any time.
Unless sooner  terminated,  the Incentive  Plan shall  terminate on November 14,
2005.  No Stock  Awards  may be  granted  under  the  Incentive  Plan  while the
Incentive Plan is suspended or after it is terminated.

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.

         There generally are no federal income tax  consequences to the optionee
or the Company 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 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,  mid-term  or  short-term  depending  on how long the
optionee holds the stock. Capital gains are generally subject to lower tax rates
than ordinary  income.  Slightly  different rules may apply to optionees who are
subject to Section 6 of the Exchange Act or who acquire stock subject to certain
repurchase options.

         To the extent the optionee  recognizes  ordinary  income by reason of a
disqualifying  disposition,  the Company will generally be entitled  (subject to
the requirement of reasonableness, Code Section 162(m) and the satisfaction of a
tax reporting  obligation) to a corresponding  business expense deduction in the
tax year in which the disqualifying disposition occurs. 
<PAGE>

         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 the Company 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,  the Company 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,  Code Section  162(m) and the  satisfaction  of a tax  reporting
obligation,  the  Company  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-term,  mid-term  or  short-term
depending on how long the optionee holds the stock. Slightly different rules may
apply to optionees  who are subject to Section  16(b) of the Exchange Act or who
acquire stock subject to certain repurchase rights.

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

         Upon  acquisition of the stock,  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.  With  respect to  employees,  the  Company is  generally
required to withhold from regular wages or supplemental  wage payments an amount
based on the ordinary income recognized. Generally, the Company will 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  acquisition  (or  vesting) of the stock.  Such gain or loss will be
long-term,  mid-term  or  short-term  depending  on how long the stock was held.
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.

         Potential Limitation on Company Deductions.  Code Section 162(m) 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 the Company, may cause
this limitation to be exceeded in any particular year.

         Certain kinds of compensation,  including qualified  "performance-based
compensation,"  are  disregarded  for purposes of the deduction  limitation.  In
accordance with Treasury  regulations issued under Section 162(m),  compensation
attributable  to stock options will qualify as  performance-based  compensation,
provided that the option is granted by a compensation committee comprised solely
of "outside  directors" and either:  (i) the option plan contains a per-employee
limitation  on the number of shares for which  options  may be granted  during a
specified period,  the per-employee  limitation is approved by the shareholders,
and the  exercise  price of the option is no less than the fair market  value of
the stock on the date of grant;  or (ii) the option is granted (or  exercisable)
only  upon  the  achievement  (as  certified  in  writing  by  the  compensation
committee)  of an  objective  performance  goal  established  in  writing by the
compensation  committee while the outcome is  substantially  uncertain,  and the
option is approved by shareholders.

         Compensation   attributable   to  restricted   stock  will  qualify  as
performance-based  compensation,  provided  that:  (i) the award is granted by a
compensation  committee  comprised  solely of "outside  directors;" and (ii) the
purchase  price of the award is no less than the fair market  value of the stock
on the date of grant.  Stock bonuses qualify as  performance-based  compensation
under  the  Treasury  regulations  only  if  (i)  the  award  is  granted  by  a
compensation  committee comprised solely of "outside  directors;" (ii) the award
is  granted  (or  exercisable)   only  upon  the  achievement  of  an  objective
performance goal established in writing by the compensation  committee while the
outcome is substantially  uncertain;  (iii) the compensation committee certifies
in  writing  prior to the  granting  (or  exercisability)  of the award that the
performance  goal  has  been  satisfied  and  (iv)  prior  to the  granting  (or
exercisability)  of the award,  shareholders have approved the material terms of
the award  (including  the  class of  employees  eligible  for such  award,  the
business criteria on which the performance goal is based, and the maximum amount
(or  formula  used to  calculate  the amount)  payable  upon  attainment  of the
performance goal).



<PAGE>




                                   PROPOSAL 3

                RATIFICATION OF SELECTION OF INDEPENDENT AUDITORS

         The Board of  Directors  has  selected  Coopers  &  Lybrand  LLP as the
Company's  independent  auditors for the fiscal year ended December 31, 1998 and
has  further  directed  that  management  submit the  selection  of  independent
auditors for ratification by the  shareholders at the Annual Meeting.  Coopers &
Lybrand LLP has audited the Company's  financial  statements since its inception
in 1987.  Representatives of Coopers & Lybrand LLP 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 LLP as
the Company's  independent  auditors is not required by the Company's  Bylaws or
otherwise.  However,  the Board is submitting the selection of Coopers & Lybrand
LLP 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 the Company
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 LLP.

                        THE BOARD OF DIRECTORS RECOMMENDS
                          A VOTE IN FAVOR OF PROPOSAL 3





<PAGE>


                              SECURITY OWNERSHIP OF
                    CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

         The  following  table  sets forth  certain  information  regarding  the
ownership  of the  Company's  Common  Stock as of February 20, 1998 by: (i) each
director;  (ii)  each  executive  officer;  (iii)  all  executive  officers  and
directors of the Company as a group;  and (iv) all those known by the Company to
be beneficial owners of more than five percent of its Common Stock.
<TABLE>
<CAPTION>

                           BENEFICIAL OWNERSHIP TABLE
- - --------------------------------------------------------------------------------
                                                       Beneficial Ownership (1)
                                                     ---------------------------
                                                       Number of       Percent
Beneficial Owner                                        Shares        of Total
- - ---------------------------------------------        -------------    ----------

<S>                                                     <C>              <C>  
Entities Affiliated with:                               911,863          20.3%
   Hambrecht & Quist Group (2)
   One Bush Street
   18th Floor
   San Francisco, CA 94104

Wellington Management Company, LLP (3)                  415,000           9.2%
   75 State Street
   Boston, MA 02109

Entities Affiliated with:                               386,454           8.6%
   Bay Partners (4)
   10600 North DeAnza Boulevard
   Suite 100
   Cupertino, CA 95014

Entities Affiliated with:                               261,500           5.8%
   Special Situations Fund III, LP (5)
   153 East 53rd Street
   51st Floor
   New York, NY 10022

Arthur H. Bruno (6)                                     180,375           4.0%
   c/o Castelle
   3255-3 Scott Boulevard
   Santa Clara, CA 95054

Randall I. Bambrough (7)                                 19,770              *

Jerome J. Burke (8)                                      92,315           2.0%

John Freidenrich (9)                                    399,453           8.9%

Robert Hambrecht (10)                                     6,128              *

Alan Kessman (11)                                        11,932              *

Roy Prasad (12)                                          59,893           1.3%

All directors and executive officers as                 709,973          15.5%
a group (total of 6 persons)
See notes (6)(7)(8)(9)(10)(11)(13) below
</TABLE>

       --------------------
       * Less than one percent of total shares.

       (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, the Company 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 4,490,047 shares  outstanding on
           February 20, 1998,  adjusted as required by rules  promulgated by the
           SEC.

<PAGE>
       (2) Includes 60,839 shares held by H & Q Ventures IV, 338,482 shares (and
           warrants  exercisable within 60 days for 16,666 shares) held by H & Q
           London Ventures,  1,251 shares held by Hamquist, 1,034 shares held by
           Venture Associates (BVI) Limited, 182,517 shares held by Ivory & Sime
           Enterprise  Capital  PLC,  85,540  shares (and  warrants  exercisable
           within  60  days  for  86,666  shares)  held  by  Hambrecht  &  Quist
           California,  43,634  shares  held by the  Hambrecht  & Quist  Venture
           Partners,  45,234  shares  held by  William  Hambrecht  and  warrants
           exercisable  within 60 days for 50,000 shares held by RVR Securities.
           The entities and individual named above and the entities'  respective
           general  partners,  directors,  executive  officers,  members  and/or
           managers,  as  applicable,   disclaim  beneficial  ownership  of  any
           securities identified other than those directly held by such person.

       (3) Wellington  Management Company, LLP ("WMC"), a registered  investment
           advisor under the Investment  Advisors Act of 1940, shares voting and
           investment  power over 415,000  shares of the Company's  Common Stock
           with its clients.

       (4) 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.
           John  Freidenrich,  a  director  of the  Company,  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 the Company'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.

       (5) Includes  197,000  shares held by Special  Situations  Fund III, L.P.
           (the "Situations  Fund") and 64,500 shares held by Special Situations
           Cayman Fund, L.P. (the "Cayman Fund").  MGP is the general partner of
           the  Situations  Fund and a registered  investment  advisor under the
           Investment  Advisors Act of 1940. Austin Marxe is the principal owner
           and president of AWM Investment Company,  Inc., ("AWM"), a registered
           investment  advisor  under the  Investment  Advisors  Act of 1940 and
           general  partner of the Cayman Fund and MGP. In such  capacities  AWM
           and Austin  Marxe  have sole  voting  and  investment  power over the
           shares of Company  Common Stock held by the  Situations  Fund and the
           Cayman Fund.

       (6) Includes 28,125 shares of Common Stock subject to options exercisable
           within 60 days of February 20, 1998 and 10,000 shares of Common Stock
           held by Mr. Bruno's wife.

       (7) Includes 19,070 shares of Common Stock subject to options exercisable
           within  60 days of  February  20,  1998  and 200  shares  held by Mr.
           Bambrough's daughter.

       (8) Includes 18,750 shares of Common Stock subject to options exercisable
           within 60 days of February 20, 1998.

       (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.
           John Freidenrich,  a director of the Company,  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. Freidenrich  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
           Freidenrich  Family Trust and 2,999 shares of Common Stock subject to
           options exercisable within 60 days of February 20, 1998.

       (10)Includes  208 shares of Common Stock  subject to options  exercisable
           within 60 days of February 20, 1998.

       (11)Includes 7,373 shares of Common Stock subject to options  exercisable
           within 60 days of February 20, 1998.

       (12)Includes 59,893 shares of Common Stock subject to option  exercisable
           within 60 days of February 20, 1998.

       (13)The total  number of shares  of Common  Stock for all  directors  and
           executive  officers  as a group does not include any shares of Common
           Stock  owned or  subject  to  options  exercisable  within 60 days of
           February 20, 1998 for Mr. Prasad who was not an executive  officer of
           the Company at February 20, 1998.



SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

         Section 16(a) of the  Securities  Exchange Act of 1934 (the "1934 Act")
requires the Company's  directors and  executive  officers,  and persons who own
more than ten percent of a registered class of the Company'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 the Company.  Officers,
directors  and  greater  than  ten  percent  shareholders  are  required  by SEC
regulation  to furnish the Company  with copies of all Section  16(a) forms they
file.

         To the Company's  knowledge,  based solely on a review of the copies of
such reports furnished to the Company and written  representations that no other
reports were  required,  during the fiscal year ended  December  31,  1997,  all
Section 16(a) filing  requirements  applicable  to its  officers,  directors and
greater  than ten  percent  beneficial  owners  were  complied  with except that
reports  by each of  Messrs.  Bambrough,  Burke,  Bruno  and  Prasad  Raje,  the
Company's  Chief Technical  Officer and Vice President of Engineering,  covering
one transaction each, were filed late. In addition, Mr. Raje's Initial Statement
of Beneficial Ownership of Securities (a "Form 3") was filed late.





<PAGE>


                             EXECUTIVE COMPENSATION

Compensation of Directors

         Directors  currently  receive no cash compensation from the Company for
their services as members of the Board. They are reimbursed for certain expenses
in connection with attendance at Board and Committee meetings.

         Each non-employee  director of the Company receives stock option grants
under the 1995  Non-Employee  Directors'  Stock  Option  Plan  (the  "Directors'
Plan").  Only  non-employee  directors  of the Company  are  eligible to receive
options under the Directors' Plan. Options granted under the Directors' Plan are
intended by the  Company not to qualify as  incentive  stock  options  under the
Code.

         Option grants under the  Directors'  Plan are  non-discretionary.  Upon
initial election to be a non-employee director, a person is granted an option to
purchase  5,000 shares of Common  Stock of the Company.  On April 1 of each year
(or the next business day should such date be a legal  holiday),  each member of
the  Company's  Board who is not an  employee  of the  Company is  automatically
granted under the Directors'  Plan,  without further action by the Company,  the
Board or the shareholders of the Company,  an option to purchase 2,000 shares of
Common Stock of the Company.  The exercise  price of options  granted  under the
Directors'  Plan is 100% of the fair market value of the Common Stock subject to
the option on the date of the option grant. Options granted under the Directors'
Plan vest in 24 equal  installments  beginning one month after the date of grant
provided the optionee has,  during the entire period prior to such vesting date,
continuously  served as a non-employee  director,  employee or consultant of the
Company or an affiliate of the Company.  The term of options  granted  under the
Directors'  Plan is ten years.  In the event of a merger of the Company  with or
into another  corporation  or a  consolidation,  acquisition  of assets or other
change-in-control transaction involving the Company, vesting will be accelerated
and the option will terminate if not exercised prior to the  consummation of the
transaction.

         Effective March 20, 1998, pursuant to the terms of the Directors' Plan,
the Company granted options covering 5,000 shares of Common Stock of the Company
to Robert  Hambrecht upon his election to the Board as a non-employee  director,
at an exercise  price per share of $2.41 which was the fair market value of such
Common Stock on the date of grant (based on the closing sales price  reported in
the National Market System for the date of grant).

         On April 1, 1997,  pursuant to the terms of the  Directors'  Plan,  the
Company granted options  covering 2,000 shares of Common Stock of the Company to
each  non-employee  director of the Company,  at an exercise  price per share of
$6.12 which was the fair market value of such Common Stock on the date of grant.
As of February  20, 1998,  no options had been  exercised  under the  Directors'
Plan.







<PAGE>


Compensation of Executive Officers

Summary of Compensation

         The following table shows for the fiscal years ended December 31, 1997,
1996 and 1995,  compensation  awarded or paid to, or earned  by,  the  Company's
Chief  Executive  Officers and its other  executive  officers whose total annual
salary and bonus exceeded $100,000 (the "Named Executive Officers"):
<TABLE>
<CAPTION>

                           SUMMARY COMPENSATION TABLE
- - ----------------------------------------------------------------------------------------------------------------------------------
                                                                                          Long-Term Compensation
                                                    Annual Compensation                           Awards
                                       -----------------------------------------------  --------------------------
                                                                                          Restricted    Securities
   Name and Principal                                                    Other Annual        Stock      Underlying       All Other
        Position              Year     Salary ($)       Bonus ($)        Compensation   Award(s)(1)($) Options (#)     Compensation
- - -------------------------    ------    ------------    -------------    --------------  -------------  -----------    --------------

<S>                           <C>       <C>               <C>                <C>            <C>           <C>              <C>
Arthur H. Bruno               1997      $183,462          $50,000            --              --            45,000          --
  Chairman of the Board,      1996      $176,538          $50,000            --              --            --              --
  Chief Executive Officer     1995      $180,000           $7,500            --              --            --              --
  and Director

Roy Prasad (2)                1997      $114,396            --               --              --           308,000      $180,000 (3)
  Former President and
  Chief Executive Officer

Jerome J. Burke               1997      $135,000         $118,584 (4)        --              --            77,000          --
  President and               1996      $124,578         $120,720 (5)        --              --            --              --
  Chief Operating Officer     1995      $117,385          $60,909            --              --            --              --

Randall I. Bambrough          1997      $126,077          $15,000            --              --            50,000          --
  Chief Financial Officer,    1996      $112,188          $10,000            --              --             5,000          --
  Vice President of           1995       $92,298             $581            --              --            10,000          --
  Finance
  and Administration
  and Secretary
</TABLE>

      ---------------
       (1)  Because  all  restricted  stock  awards  required  purchase  by  the
         recipient  at fair market  value on the date of grant,  the  restricted
         stock awards had no dollar value to the recipient on the date of grant.
         At December 31, 1997, the aggregate holdings and dollar value (based on
         the  closing  sales  price at the end of 1997 of the  Company's  Common
         Stock as  reported  on the Nasdaq  National  market  multiplied  by the
         number  of shares  held) of  restricted  stock of the  Named  Executive
         Officers was as follows:  Arthur H. Bruno,  132,250  shares,  valued at
         $281,031 and Jerome J. Burke,  73,065 shares,  valued at $155,263.  The
         restrictions on awards of restricted stock lapse with respect to 25% of
         the total  number of shares  per year on the first  anniversary  of the
         date of grant and with respect to 1/48th of the total shares subject to
         the award each month  thereafter  such that the shares are fully vested
         on the fourth  anniversary of the date of grant.  Dividends are paid on
         shares of restricted stock when, as and if the Board declares dividends
         on the Common Stock of the Company.
      (2)Mr. Prasad was President  and Chief  Executive  Officer from April 1997
         through November 1997.
      (3)Represents  payments made pursuant to the Company's executive severance
         agreement with Mr. Prasad. See "Executive Compensation - Termination of
         Employment Arrangements."
      (4)Represents  bonus and sales  commissions  paid by the Company for sales
         made in 1997.
      (5)Represents  bonus and sales  commissions  paid by the Company for sales
         made in 1996.



Stock Option Grants and Exercises

         The  Company  grants  options  to  its  executive  officers  under  the
Incentive Plan. As of February 20, 1998, all employees,  executive  officers and
non-employee  directors options to purchase a total of 1,077,009 shares had been
granted  and were  outstanding  under  the  Incentive  Plan and  533,567  shares
remained available for grant thereunder.

         There were no stock option exercises during 1997 by any Named Executive
Officer.
<PAGE>

         The following  tables show for the fiscal year ended December 31, 1997,
certain  information  regarding  options  granted to,  exercised by, and held at
year-end by the Named Executive Officers: 
<TABLE> 
<CAPTION>

                                             OPTION GRANTS IN LAST FISCAL YEAR
- - ----------------------------------------------------------------------------------------------------------------------------
                         Number of                                                          Potential Realizable Value at
                        Securities        % of Total                                     Assumed Annual Rates of Stock Price
                        Underlying         Options          Exercise                         Appreciation for Option Term
                                                                                         -----------------------------------
    Name and          Options Granted     Granted in         Price         Expiration
    Principal                            Fiscal Year     Per Share (2)        Date            5% ($)             10% ($)
    Position                                 (1)
- - ------------------    --------------    -------------    -------------    -----------    ----------------    ---------------

<S>                        <C>               <C>            <C>            <C>                <C>                <C>
Arthur H. Bruno            45,000            3.8%           $5.75          2/12/04            $108,180           $260,820
  Chairman of the
  Board,
  Chief Executive
  Officer
  and Director

Roy Prasad (3)            308,000           26.0%           $4.50          08/18/04           $579,348         $1,397,088
  President and
  Chief Executive
  Officer

Jerome J. Burke            47,000            4.0%           $4.50          8/18/04             $88,407           $213,192
  President and            30,000            2.5%           $5.75          2/12/04             $72,120           $173,880
  Chief Operating
  Officer

Randall I. Bambrough       45,000            3.8%           $4.50          8/18/04             $84,645           $204,120
  Chief Financial           5,000             .4%           $5.50          1/22/04             $11,495            $27,720
  Officer,
  Vice President
  of Finance
  and Administration
  and Secretary
</TABLE>

      --------------------
      (1)Based on an aggregate of  1,184,370  shares of Common Stock  subject to
         options granted to employees in 1997.
      (2)The exercise  price is equal to 100% of the fair market value of Common
         Stock at the date of grant.
      (3)Mr.  Prasad  served as the  Company's  President  and  Chief  Executive
         Officer from April 1997 through November 1997.



Compensation Committee Interlocks and Insider Participation

         As noted above,  the  Company's  Board,  consisting  of Messrs.  Bruno,
Freidenrich, Hambrecht and Kessman, acts on matters concerning executive officer
compensation.  Mr. Bruno was Chief Executive Officer of the Company from October
1993  through  April  1997 and has  served  as such  from  November  1997 to the
present.  He served as President of the Company from October 1993 through  April
1997. Mr. Bruno is excused from Board deliberations concerning his compensation.

Termination of Employment Arrangements

         Effective  November  14,  1997  Mr.  Prasad  resigned  as  a  director,
President  and Chief  Executive  officer of the Company.  Under the terms of his
executive  severance  agreement the Company paid him $180,000  within 30 days of
his  resignation,  maintained his medical benefits for one year and extended the
period  during  which the  vested  portion  of stock  options at the date of his
resignation  exercisable  for Company  Common Stock may be exercised  from three
months  after  termination  of  employment  to one  year  after  termination  of
employment.  In addition, the Company agreed that the acquisition of the Company
in certain circumstances, which include the transaction being deemed a change in
control,  within  one year from Mr.  Prasad's  resignation,  will  result in the
immediate  vesting of the  248,107  unvested  shares of  Castelle  Common  Stock
subject to the options currently held by Mr. Prasad.

         The  Company  has  entered  into  severance  and   transition   benefit
agreements  with Messrs.  Bambrough and Burke pursuant to which the Company will
pay the executive a lump sum equal to 100% of each officer's  annualized  salary
and maintain the medical benefits enjoyed by him for one year following either a
voluntary  termination  of  employment  for  good  reason  (as  defined  in  the
agreement) by the executive or an involuntary  termination of employment without
cause (as defined in the agreement).  In addition, each executive is eligible to
earn an additional lump sum payment equal to six months of his base salary if he
remains  with the Company at least  ninety days after a change in control and is
terminated for cause or leaves voluntarily without good reason, or if he remains
in excess of ninety days and his employment is subsequently terminated.

<PAGE>


           REPORT OF THE BOARD OF DIRECTORS ON EXECUTIVE COMPENSATION(*1)

         The Board is responsible for determining  compensation policies for the
Company's  executive   officers,   including  any  stock-based  awards  to  such
individuals  under the Company's  1988 Equity  Incentive  Plan.  In  determining
executive  officer  compensation,  the  Board  considers  corporate  performance
against the Company's objectives.

         In addition,  the Board structures executive compensation packages with
two objectives:  (1) to ensure that the compensation and incentives  provided to
the  executive  officers  are  closely  aligned  with  the  Company's  financial
performance  and  shareholder  value,  and (2) to attract and retain,  through a
competitive  compensation  structure,  those  key  executives  critical  to  the
long-term success of the Company.

         In addressing  the first  objective,  the Board  utilizes  stock option
grants to executive  officers in lieu of higher  salaries or cash bonuses to tie
executive   officer   compensation   directly  to  the  Company's   stock  price
performance.  The Board  believes  that the grant of an equity  interest  in the
Company serves to link management  interests with  shareholder  interests and to
motivate  executive officers to make decisions that are in the best interests of
the Company and the  shareholders.  The Board  considers  stock option grants to
executive  officers  based on  various  factors,  including  (i) each  officer's
responsibilities,  (ii) any changes in such responsibilities,  (iii) past option
grants and each  officer's  current  equity  interest  in the  Company  and (iv)
performance.

         The second objective of the overall  executive  compensation  policy is
addressed by a salary and bonus policy  which is based on (i)  consideration  of
the salaries and total  compensation of executive  officers in similar positions
with comparable companies in the industry (ii) the qualifications and experience
of each executive officer,  (iii) the Company's financial performance during the
past year and (iv) each  officer's  performance  against  objectives  related to
their areas of responsibility.  The Board  periodically  reviews individual base
salaries of executive  officers,  and adjusts  salaries  based on individual job
performance and changes in the officer's duties and responsibilities.  In making
salary decisions, the Board exercises its discretion and judgment based on these
factors.  No specific formula is applied to determine the weight of each factor,
although the mix among the compensation  elements of salary,  cash incentive and
stock  options are biased  toward stock  options to  emphasize  the link between
executive  incentives and the creation of  shareholder  value as measured by the
equity  markets.  Consequently,  salaries  and  cash  incentives  are set in the
low-range as compared to the  comparable  companies in the industry  while stock
options are set in the mid to high-range compared to comparable  companies.  The
Chief Executive Officer provides the Board with  recommendations  for individual
executive  officers  based  upon an  evaluation  of  their  performance  against
objectives and responsibilities.

         The Board  believes that another key element of executive  compensation
should be the variable portion provided by annual cash incentive plans. The cash
incentive portion of the executive officers' compensation is dependent primarily
on the Company's  financial  performance and achievement of specified  corporate
objectives as determined by the Board.  The Company's  executive  officer annual
bonus  plan is  designed  such that if the  Company  performs  above its  stated
objectives,  cash incentives  awarded may be above the targeted amounts.  If the
Company performs below its stated  objectives,  cash awards may be significantly
reduced,  and may be  eliminated  altogether  if  performance  is below  defined
thresholds.  A substantially smaller portion of each executives' annual bonus is
based on performance against individual objectives.

         The Board  uses the same  factors  described  above  for the  executive
officers in setting the annual  salary,  stock option grant and cash  incentives
awarded to the Chief Executive Officer. As a result of the subjective evaluation
of these factors,  the Board did not increase his base salary for 1997 above the
amount earned by him in 1996 and his cash bonus also remained unchanged. In 1997
the Board did grant the Chief  Executive  Officer  options  to  purchase  45,000
shares of the Company's  Common Stock at fair market value on the date of grant.
The Chief  Executive  Officer,  who is also a  director,  was  excused  from the
Board's consideration of his compensation package.

         In  connection  with the  engagement  of Mr.  Prasad  as the new  Chief
Executive  Officer  of the  Company  in  April  1997,  the  Board  negotiated  a
compensation package with that individual which included provision for severance
payments upon the  termination  of his employment  under certain  circumstances.
Those  circumstances were triggered when Mr. Prasad left the Company in November
1997. The compensation  package received by Mr. Prasad,  including the severance
component,  was approved by the Board based on the collective  experience of the
Board  members  with  respect to the  competitive  labor  market in the  Silicon
Valley, the opportunities  available to qualified candidates such as Mr. Prasad,
and the terms of compensation  packages  typically  offered to attract qualified
executive officers.
- - ----------
*1   The  material in this report is not  "soliciting  material,"  is not deemed
     "filed" with the SEC, and is not to be  incorporated  by reference into any
     filing of the Company  under the 1933 Act or 1934 Act,  whether made before
     or after the date  hereof and  irrespective  of any  general  incorporation
     language contained in such filing.
 
<PAGE>
         Section  162(m) of the Internal  Revenue  Code (the "Code")  limits the
Company  to a  deduction  for  federal  income tax  purposes  of no more than $1
million of compensation  paid to certain Named  Executive  Officers in a taxable
year.  Compensation above $1 million may be deducted if it is "performance-based
compensation"  within the meaning of the Code. The Committee has determined that
stock  options  granted under the Company's  1998  Incentive  Stock Plan with an
exercise  price at least equal to the fair market value of the Company's  Common
Stock on the date of grant shall be rated as  "performance-based  compensation."
As a result, the Company's  shareholders have been asked to approve an amendment
to this plan which would allow any compensation  recognized by a Named Executive
Officer as a result of such a stock option to be deductible  by the Company,  as
part of the package of amendments discussed in the second proposal of this proxy
statement  which will also increase the number of shares  available for issuance
under the Incentive Plan.

 Arthur H. Bruno     John Freidenrich      Robert Hambrecht      Alan Kessman






<PAGE>


                       PERFORMANCE MEASUREMENT COMPARISON(*2)


         The following table shows the total shareholder return of an investment
of $100 in cash on December 20, 1995 for (i) the Company's  Common  Stock,  (ii)
the Nasdaq  Stock  Market  Index (US  Companies)  and (iii) the Nasdaq  Computer
Manufacturers  Stock Index. All values assume reinvestment of the full amount of
all dividends and are calculated as of December 31 of each year:
<TABLE>
<CAPTION>


                         PERFORMANCE MEASUREMENT TABLE
- - --------------------------------------------------------------------------------
     Date            CASTELLE          Nasdaq Stock          Nasdaq Computer
                                       Market Index        Manufacturers Stock
                                      (US Companies)              Index
- - ------------    ----------------    -------------------    ---------------------
<S>   <C>           <C>                 <C>                      <C>     
   12/20/95         $100.000            $100.000                 $100.000
   12/29/95         $106.897            $102.668                 $101.867
   12/31/96          $79.310            $126.278                 $136.783
   12/31/97          $29.310            $154.996                 $165.580


</TABLE>
- - --------
*2   This Section is not  "soliciting  material," is not deemed "filed" with the
     SEC and is not to be incorporated by reference in any filing of the Company
     under the 1933 Act or the 1934 Act  whether  made  before or after the date
     hereof and irrespective of any general  incorporation  language in any such
     filing.



<PAGE>



                              CERTAIN TRANSACTIONS

         The  Company's  Bylaws  provide  that the Company  will  indemnify  its
directors  and  executive  officers  to the  fullest  extent not  prohibited  by
California law. Under the Company's Bylaws,  indemnified parties are entitled to
indemnification  for negligence,  gross  negligence and otherwise to the fullest
extent  permitted  by law.  The  Bylaws  also  require  the  Company  to advance
litigation expenses in the case of legal proceedings,  against an undertaking by
the indemnified party to repay such advances if it is ultimately determined that
the indemnified party is not entitled to indemnification.







<PAGE>



                                  OTHER MATTERS

         The 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
                                   
                                              /s/ Randall I. Bambrough

                                              Randall I. Bambrough
                                              Secretary



April 1, 1998

         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, 1997 is available
without charge upon written request to: Corporate  Secretary,  Castelle,  3255-3
Scott Boulevard, Santa Clara, California 95054.



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