CASTELLE \CA\
10QSB/A, 1996-09-05
COMPUTER PERIPHERAL EQUIPMENT, NEC
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  FORM 10-QSB/A
                                 Amendment No. 1

(Mark One)
  [X]            QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                  For the quarterly period ended June 28, 1996

                                       OR

  [  ]           Transition Report Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

                         Commission File Number 0-220-20

                                    CASTELLE
                 (Name of small business issuer in its charter)
                         -------------------------------

                   California                      77-0164056
          (State of other jurisdiction of        (I.R.S. Employer
          incorporation or organization)         Identification No.)

              3255-3 Scott Boulevard, Santa Clara, California 95054
          (Address of principal executive offices, including zip code)

         Issuer's telephone number, including area code: (408) 496-0474

        SECURITIES REGISTERED PURSUANT TO Section 12(b) OF THE ACT: NONE

           SECURITIES REGISTERED PURSUANT TO Section 12(g) OF THE ACT:
                            COMMON STOCK NO PAR VALUE
                                (Title of Class)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  Registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes X No


The  number  of  shares of  Common  Stock  outstanding  as of August 8, 1996 was
3,620,844.















                                    CASTELLE

                                      INDEX



 

Part II.  OTHER INFORMATION

Item 6.   Exhibits and Reports on Form 8-K

          Signatures
 
          Index of Exhibits

          Amended and Restated Loan and Security Agreement

          Export-Import Bank Amended and Restated Loan and Security Agreement

          Collateral Assignment, Patent Mortgage and Security Agreement

          Export-Import Bank of the United States Working Capital Guarantee
          Program









                           PART II - OTHER INFORMATION

Item 6.   Exhibits and Reports on Form 8-K


(A)        Exhibits

             Item               Description

             11.1*              Statement re:  computation of per share earnings
             27*                Financial Data Schedule

*  Previously filed






SIGNATURES

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

By: /s/ Arthur H. Bruno                                 Date:  September 5, 1996
     --------------------------
     Arthur H. Bruno
     Chief Executive Officer and President
     (Principal Executive Officer)

By: /s/ Randall I. Bambrough                            Date:  September 5, 1996
     ---------------------------------
     Randall I. Bambrough
     Vice President of Finance and Administration
     Chief Financial Officer
     (Principal Financial and Accounting Officer)










                                    CASTELLE
                                INDEX OF EXHIBITS


11.1 *  Computation of Net Income Per Share


*  Previously filed






 


                AMENDED AND RESTATED LOAN AND SECURITY AGREEMENT

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




     This AMENDED AND RESTATED LOAN AND SECURITY  AGREEMENT (the "Agreement") is
entered into as of June 20, 1996,  by and between  SILICON  VALLEY BANK ("Bank")
and CASTELLE ("Borrower").


                                    RECITALS

     Bank and Borrower are parties to that certain Amended and Restated Loan and
Security  Agreement  dated  February 9, 1994,  as amended by those  certain Loan
Modification  Agreements dated as of March 31, 1995, August 31, 1995,  September
20,  1995,  February  8, 1996 and March 31,  1996 and as may be or may have been
further amended.

     Borrower  wishes to continue  to borrow  money from time to time from Bank,
and Bank  desires to continue to lend money to  Borrower.  This  Agreement  sets
forth the terms on which Bank will lend money to  Borrower,  and  Borrower  will
repay the amounts owing to Bank.


                                    AGREEMENT

     The parties agree as follows:

     1. DEFINITIONS AND CONSTRUCTION

     1.1 Definitions.  As used in this Agreement, the following terms shall have
     the following definitions:

     "Accounts"  means all presently  existing and hereafter  arising  accounts,
contract  rights,  and all other forms of obligations  owing to Borrower arising
out of the sale or lease of goods (including,  without limitation, the licensing
of software  and other  technology)  or the  rendering  of services by Borrower,
whether  or not  earned  by  performance,  and  any and  all  credit  insurance,
guaranties,  and other security therefor, as well as all merchandise returned to
or reclaimed by Borrower and Borrower's Books relating to any of the foregoing.

     "Advance" or "Advances"  means an Advance  under the Revolving  Facility or
the Exim Sub-Facility.

     "Affiliate"  means,  with  respect to any  Person,  any Person that owns or
controls  directly or  indirectly  such Person,  any Person that  controls or is
controlled  by or is under common  control  with such  Person,  and each of such
Person's senior executive officers, directors, and partners.

     "Bank  Expenses"  means  all:   reasonable  costs  or  expenses  (including
reasonable  attorneys'  fees  and  expenses)  incurred  in  connection  with the
preparation, negotiation, administration, and enforcement of the Loan Documents;
and  Bank's  reasonable  attorneys'  fees and  expenses  incurred  in  amending,
enforcing or defending the Loan Documents, whether or not suit is brought.

     "Borrower's  Books" means all of  Borrower's  books and records  including:
ledgers;  records concerning  Borrower's assets or liabilities,  the Collateral,
business operations or financial condition;  and all computer programs,  or tape
files, and the equipment, containing such information.

     "Borrowing Base" has the meaning set forth in Section 2.1 hereof.

     "Business Day" means any day that is not a Saturday,  Sunday,  or other day
on which banks in the State of California are authorized or required to close.

     "Closing Date" means the date of this Agreement.

     "Code" means the California Uniform Commercial Code.

     "Collateral" means the property described on Exhibit A attached hereto.

     "Committed Line" means Six Million Dollars ($6,000,000).

     "Contingent  Obligation"  means,  as applied to any  Person,  any direct or
indirect liability,  contingent or otherwise, of that Person with respect to (i)
any  indebtedness,  lease,  dividend,  letter of credit or other  obligation  of
another,  including,   without  limitation,  any  such  obligation  directly  or
indirectly guaranteed,  endorsed, co-made or discounted or sold with recourse by
that  Person,  or in respect  of which  that  Person is  otherwise  directly  or
indirectly  liable;  (ii) any  obligations  with  respect to undrawn  letters of
credit issued for the account of that Person; and (iii) all obligations  arising
under any interest rate, currency or commodity swap agreement, interest rate cap
agreement,  interest rate collar  agreement,  or other  agreement or arrangement
designated to protect a Person against  fluctuation in interest rates,  currency
exchange rates or commodity prices; provided, however, that the term "Contingent
Obligation"  shall not include  endorsements  for  collection  or deposit in the
ordinary course of business.  The amount of any Contingent  Obligation  shall be
deemed to be an amount equal to the stated or  determined  amount of the primary
obligation  in respect of which such  Contingent  Obligation  is made or, if not
stated or determinable,  the maximum reasonably anticipated liability in respect
thereof as determined by such Person in good faith; provided, however, that such
amount shall not in any event exceed the maximum amount of the obligations under
the guarantee or other support arrangement.

     "Current  Liabilities"  means, as of any applicable  date, all amounts that
should,  in  accordance  with GAAP,  be included as current  liabilities  on the
consolidated  balance sheet of Borrower and its  Subsidiaries,  as at such date,
plus, to the extent not already included therein,  all outstanding Advances made
under this Agreement,  including all Indebtedness that is payable upon demand or
within one year from the date of determination  thereof unless such Indebtedness
is renewable or extendable at the option of Borrower or any Subsidiary to a date
more than one year from the date of  determination,  but excluding  Subordinated
Debt.

     "Daily  Balance" means the amount of the  Obligations  owed at the end of a
given day.

     "Eligible  Accounts" means those Accounts that arise in the ordinary course
of Borrower's  business that comply with all of Borrower's  representations  and
warranties  to Bank set  forth in  Section  5.4,  provided,  that  standards  of
eligibility  may be  fixed  and  revised  from  time to  time by Bank in  Bank's
reasonable  judgment  and upon  thirty  (30) days'  prior  written  notification
thereof to Borrower in accordance with the provisions  hereof.  Unless otherwise
agreed to by Bank, Eligible Accounts shall not include the following:

     (a) Accounts  that the account  debtor has failed to pay within ninety (90)
     days of invoice date;

     (b) Accounts  with respect to an account  debtor,  fifty  percent  (50%) of
     whose Accounts the account debtor has failed to pay within ninety (90) days
     of invoice date;

     (c)  Accounts  with  respect  to which the  account  debtor is an  officer,
     employee, or agent of Borrower;

     (d)  Accounts  with  respect  to which  goods are  placed  on  consignment,
     guaranteed sale, sale or return, sale on approval,  bill and hold, or other
     terms  by  reason  of  which  the  payment  by the  account  debtor  may be
     conditional;

     (e) Accounts  with  respect to which the account  debtor is an Affiliate of
     Borrower;

     (f)  Accounts  with  respect to which the account  debtor does not have its
     principal place of business in the United States;

     (g) Accounts with respect to which the account  debtor is the United States
     or any department,  agency, or instrumentality of the United States (unless
     Borrower has complied  with the Federal  Assignment of Claims Act to Bank's
     reasonable satisfaction);

     (h) Accounts with respect to which Borrower is liable to the account debtor
     for goods sold or services rendered by the account debtor to Borrower,  but
     only to the  extent of any  amounts  owing to the  account  debtor  against
     amounts owed to Borrower;

     (i) Accounts with respect to an account debtor,  including Subsidiaries and
     Affiliates,  whose total obligations to Borrower exceed twenty-five percent
     (25%)  of  all  Accounts,   to  the  extent  such  obligations  exceed  the
     aforementioned  percentage,  except (i) for the  Accounts of Ingram Micro D
     and  Macnica  for  which the  applicable  percentage  shall be  thirty-five
     percent (35%), and (ii) as approved in writing by Bank;

     (j) Accounts with respect to which the account debtor disputes liability or
     makes any claim with  respect  thereto as to which  Bank  believes,  in its
     reasonable  discretion,  that there may be a basis for dispute (but only to
     the extent of the amount  subject to such dispute or claim),  or is subject
     to  any  Insolvency  Proceeding,  or  becomes  insolvent,  or  goes  out of
     business; and

     (k) Accounts  the  collection  of which Bank  reasonably  determines  after
     reasonable inquiry to be doubtful.

     "Equipment"  means all  present  and future  machinery,  equipment,  tenant
improvements,  furniture,  fixtures,  vehicles,  tools, parts and attachments in
which Borrower has any interest.

     "ERISA" means the  Employment  Retirement  Income  Security Act of 1974, as
amended, and the regulations thereunder.

     "Exim  Sub-Facility"  means the facility  under which  Borrower may request
Bank to issue cash  advances,  as specified in that certain  Export-Import  Bank
Amended and Restated Loan and Security  Agreement of even date herewith  between
Borrower and Bank.

     "GAAP" means  generally  accepted  accounting  principles as in effect from
time to time.

     "Indebtedness"  means  (a)  all  indebtedness  for  borrowed  money  or the
deferred purchase price of property or services,  including  without  limitation
reimbursement  and other obligations with respect to surety bonds and letters of
credit,  (b) all obligations  evidenced by notes,  bonds,  debentures or similar
instruments,   (c)  all  capital  lease   obligations  and  (d)  all  Contingent
Obligations.

     "Insolvency  Proceeding"  means any proceeding  commenced by or against any
person or entity under any  provision of the United States  Bankruptcy  Code, as
amended, or under any other  bankruptcy or insolvency law, including assignments
for the  benefit  of  creditors,  formal or  informal  moratoria,  compositions,
extension generally with its creditors,  or proceedings seeking  reorganization,
arrangement, or other relief.

     "Inventory"  means all present and future  inventory in which  Borrower has
any interest, including merchandise, raw materials, parts, supplies, packing and
shipping  materials,  work in process and finished products intended for sale or
lease  or to be  furnished  under a  contract  of  service,  of  every  kind and
description  now  or at  any  time  hereafter  owned  by or in  the  custody  or
possession,  actual or constructive, of Borrower, including such inventory as is
temporarily  out of its custody or  possession  or in transit and  including any
returns  upon any  accounts or other  proceeds,  including  insurance  proceeds,
resulting from the sale or disposition of any of the foregoing and any documents
of title  representing any of the above, and Borrower's Books relating to any of
the foregoing.

     "Investment"   means  any   beneficial   ownership  of  (including   stock,
partnership  interest or other securities) any Person,  or any loan,  advance or
capital contribution to any Person.

     "IRC"  means  the  Internal  Revenue  Code of  1986,  as  amended,  and the
regulations thereunder.

     "Lien" means any mortgage,  lien, deed of trust, security interest or other
encumbrance.

     "Loan Documents"  means,  collectively,  this Agreement,  any note or notes
executed by Borrower,  and any other agreement entered into between Borrower and
Bank in connection with this Agreement including that certain Export-Import Bank
Amended and  Restated  Loan and  Security  Agreement  of even date  herewith and
related documents, all as amended or extended from time to time.

     "Material  Adverse  Effect"  means a  material  adverse  effect  on (i) the
business  operations  or condition  (financial or otherwise) of Borrower and its
Subsidiaries  taken as a whole or (ii) the  ability  of  Borrower  to repay  the
Obligations,  or (iii) the  Collateral  or the  priority  of Bank's  lien on the
Collateral, taken as a whole.

     "Maturity Date" means the date immediately  preceding the first anniversary
of the date of this Agreement.

     "Negotiable  Collateral" means all of Borrower's present and future letters
of credit of which it is a beneficiary, notes, drafts, instruments,  securities,
documents of title,  and chattel paper,  and Borrower's Books relating to any of
the foregoing.

     "Net  Income"  means,   on  a  consolidated   basis,  as  at  any  date  of
determination,  for any period,  net income (or loss) of Borrower as  determined
and computed in accordance  with GAAP;  provided,  however,  that there shall be
excluded from the determination of Net Income the income (or loss) of any Person
accrued  prior to the date it becomes a Subsidiary of Borrower or is merged into
or consolidated with Borrower or that Person's assets are acquired by Borrower.

     "Obligations" means all debt,  principal,  interest,  Bank Expenses and all
other  amounts  owed to the Bank by Borrower  pursuant to this  Agreement or any
other agreement,  including, without limitation, that certain Export-Import Bank
Amended and Restated Loan and Security Agreement of even date herewith,  whether
absolute or contingent, due or to become due, now existing or hereafter arising,
including  any interest  that accrues  after the  commencement  of an Insolvency
Proceeding and including any debt, liability,  or obligation owing from Borrower
to others that Bank may have obtained by assignment or otherwise.

     "Periodic  Payments" means all installments or similar  recurring  payments
that Borrower may now or hereafter  become  obligated to pay to Bank pursuant to
the terms and  provisions  of any  instrument,  or agreement now or hereafter in
existence between Borrower and Bank.

     "Permitted Indebtedness" means:

     (a)  Indebtedness of Borrower in favor of Bank arising under this Agreement
     or any other Loan Document;

     (b) Existing Indebtedness disclosed on the Schedule;

     (c) Subordinated Debt;

     (d)  Indebtedness  to trade  creditors and with respect to surety bonds and
     similar obligations incurred in the ordinary course of business;

     (e)  Indebtedness of Borrower to any Subsidiary and Contingent  Obligations
     of Borrower with respect to obligations  of any  Subsidiary  (provided that
     the primary obligations are not prohibited hereby), and Indebtedness of any
     Subsidiary  to any  other  Subsidiary  and  Contingent  Obligations  of any
     Subsidiary  with respect to obligations of any other  Subsidiary  (provided
     that the primary obligations are not prohibited hereby);

     (f) Indebtedness secured by Permitted Liens;

     (g) Capital leases or indebtedness  incurred  solely to purchase  Equipment
     which is secured in accordance  with clause (c) of "Permitted  Liens" below
     and is not in excess of the lesser of the purchase  price of such Equipment
     or the fair market value of such equipment on the date of acquisition; and

     (h) Extensions, refinancings, modifications, amendments and restatements of
     any of items of Permitted Indebtedness (a) through (g) above, provided that
     the principal  amount thereof is not increased or the terms thereof are not
     modified to impose more  burdensome  terms upon Borrower or its Subsidiary,
     as the case may be.

     "Permitted Investment" means:

     (a) Investments existing on the Closing Date disclosed in the Schedule;

     (b) (i) marketable direct obligations issued or unconditionally  guaranteed
     by the United States of America or any agency or any State thereof maturing
     within one (1) year from the date of acquisition  thereof,  (ii) commercial
     paper maturing no more than one (1) year from the date of creation  thereof
     and currently  having the highest rating  obtainable from either Standard &
     Poor's   Corporation  or  Moody's  Investor   Services,   Inc.,  and  (iii)
     certificates of deposit maturing no more than one (1) year from the date of
     investment therein issued by Bank;

     (c) Investments consisting of the endorsement of negotiable instruments for
     deposit or collection  or similar  transactions  in the ordinary  course of
     business;

     (d) Investments  (whether consisting of the purchase of securities,  loans,
     capital  contributions,  or  otherwise)  of  Subsidiaries  in or  to  other
     Subsidiaries or in Borrower;

     (e) Investments  consisting of (i) compensation of employees,  officers and
     directors of Borrower or its Subsidiaries so long as the Board of Directors
     of Borrower  determines that such  compensation is in the best interests of
     Borrower,  (ii)  travel  advances,  employee  relocation  loans  and  other
     employee loans and advances in the ordinary course of business; (iii) loans
     to  employees,  officers or  directors  relating to the  purchase of equity
     securities of Borrower or its Subsidiaries;

     (f) Investments  (including debt  obligations)  received in connection with
     the  bankruptcy  or   reorganization  of  customers  or  suppliers  and  in
     settlement of delinquent obligations of, and other disputes with, customers
     or suppliers, arising in the ordinary course of business;

     (g)  Investments  pursuant  to or  arising  under  currency  agreements  or
     interest rate agreements entered into in the ordinary course of business;

     (h) Investments consisting of notes receivable of, or prepaid royalties and
     other credit  extensions to, customers and suppliers who are not Affiliates
     in the ordinary course of business;  provided that this paragraph (h) shall
     not apply to Investments by Borrower in any Subsidiary;

     (i) Investments constituting acquisitions permitted under Section 7.3;

     (j)  Investments  consisting of deposit  accounts of Borrower in which Bank
     has a Lien prior to any other Lien; and

     (k) Investments  accepted in connection with Transfers permitted by Section
     7.1.

     "Permitted Liens" means the following:

     (a) Any Liens  existing as of the date hereof and disclosed in the Schedule
     or arising under this Agreement or the other Loan Documents;

     (b) Liens for taxes,  fees,  assessments or other  governmental  charges or
     levies,  either  not  delinquent  or  being  contested  in  good  faith  by
     appropriate  proceedings,  provided  the same have no priority  over any of
     Bank's security interests;

     (c) Liens (i) upon or in any  Equipment  acquired by Borrower or any of its
     Subsidiaries to secure the purchase price of such Equipment or indebtedness
     incurred  solely  for the  purpose of  financing  the  acquisition  of such
     Equipment,  or  (ii)  existing  on  such  Equipment  at  the  time  of  its
     acquisition,  provided that the Lien is confined  solely to such Equipment,
     and the proceeds of such Equipment;

     (d) Leases or subleases  and license and  sublicenses  granted to others in
     the  ordinary  course  of  Borrower's  or its  Subsidiaries'  business  not
     interfering  in any material  respect with the business of Borrower and its
     Subsidiaries  taken  as a whole,  and any  interest  or title of a  lessor,
     licensor or under any lease or license;

     (e) Liens on assets (including the proceeds thereof and accessions thereto)
     that  existed at the time such  assets  were  acquired  by  Borrower or any
     Subsidiary  (including  Liens on assets of any corporation  that existed at
     the time it became or becomes a Subsidiary);  provided,  such Liens are not
     granted in  contemplation  of or in connection with the acquisition of such
     asset by Borrower or a Subsidiary;

     (f) Liens on Equipment leased by Borrower or any Subsidiary  pursuant to an
     operating  lease in the  ordinary  course of business  (including  proceeds
     thereof  and  accessions  thereto)  incurred  solely  for  the  purpose  of
     financing the lease of such Equipment  (including  Liens pursuant to leases
     permitted  pursuant to Section  7.1 and Liens  arising  from UCC  financing
     statements regarding leases permitted by this Agreement);

     (g) Liens arising from judgments,  decrees or attachments in  circumstances
     not constituting an Event of Default under Section 8.7;

     (h) Easements, reservations, rights-of-way,  restrictions, minor defects or
     irregularities in title and other similar charges or encumbrances affecting
     real property not constituting a Material Adverse Effect;

     (i) Liens in favor of customs and revenue  authorities  arising as a matter
     of law  to  secure  payment  of  customs  duties  in  connection  with  the
     importation of goods entered into in the ordinary course of business;

     (j) Liens that are not prior to the Lien of Bank which constitute rights of
     set-off of a customary  nature or bankers' Liens with respect to amounts on
     deposit,  whether arising by operation of law or by contract, in connection
     with  arrangements  entered  into  with  banks in the  ordinary  course  of
     business;

     (k) Liens on  insurance  proceeds in favor of insurance  companies  granted
     solely as security for financed premiums;

     (l) Earn-out and royalty obligations existing on the date hereof or entered
     into in connection with an acquisition permitted by Section 7.3; and

     (m) Liens incurred in connection with the extension, renewal or refinancing
     of the  indebtedness  secured  by Liens of the type  described  in  clauses
     (a)(c)(d)(e)(f)  and (l) above,  provided  that any  extension,  renewal or
     replacement  Lien  shall  be  limited  to the  property  encumbered  by the
     existing Lien and the principal amount of the indebtedness  being extended,
     renewed or refinanced does not increase.

     "Person" means any individual,  sole proprietorship,  partnership,  limited
liability   company,   joint  venture,   trust,   unincorporated   organization,
association,  corporation,  institution, public benefit corporation, firm, joint
stock company, estate, entity or governmental agency.

     "Potential  Event of Default" means a condition or event that, after notice
or lapse of time or both, would constitute an Event of Default.

     "Prime Rate" means the variable rate of interest,  per annum, most recently
announced by Bank, as its "prime rate,"  whether or not such  announced  rate is
the lowest rate available from Bank.

     "Quick Assets"  means,  at any date as of which the amount thereof shall be
determined,  the consolidated cash,  cash-equivalents,  accounts  receivable and
investments,  with  maturities  not to  exceed  90  days,  of  Borrower  and its
Subsidiaries determined in accordance with GAAP.

     "Responsible  Officer" means each of the Chief Executive Officer, the Chief
Financial Officer and the Controller of Borrower.

     "Revolving  Facility"  means the facility  under which Borrower may request
Bank to issue cash advances, as specified in Section 2.1 hereof.

     "Schedule" means the schedule of exceptions attached hereto, if any.

     "Subordinated   Debt"  means  any  debt   incurred  by  Borrower   that  is
subordinated  to the debt owing by Borrower to Bank on terms  acceptable to Bank
(and identified as being such by Borrower and Bank).

     "Subsidiary"  means any Person in which  Borrower,  directly or indirectly,
owns or controls more than 50% of the voting stock or other equity interests.

     "Tangible Net Worth" means at any date as of which the amount thereof shall
be determined,  the  consolidated  total assets of Borrower and its Subsidiaries
minus,  without  duplication,  (i) the sum of any  amounts  attributable  to (a)
goodwill,  (b) intangible  items such as unamortized  debt discount and expense,
patents,  trade and  service  marks  and  names,  copyrights  and  research  and
development  expenses except prepaid expenses,  and (c) all reserves not already
deducted from assets, and (ii) Total Liabilities.

     "Total  Liabilities" means at any date as of which the amount thereof shall
be  determined,  all  obligations  that  should,  in  accordance  with  GAAP  be
classified  as  liabilities  on the  consolidated  balance  sheet  of  Borrower,
including in any event all  Indebtedness,  except to the extent  eliminated as a
consequence of consolidation.

     1.2 Accounting Terms. All accounting terms not specifically  defined herein
shall be construed in accordance with GAAP and all  calculations  made hereunder
shall be made in accordance  with GAAP. When used herein,  the terms  "financial
statements" shall include the notes and schedules thereto.

     2. LOAN AND TERMS OF PAYMENT

     2.1  Advances.  Subject  to and  upon  the  terms  and  conditions  of this
Agreement,  Bank agrees to make Advances to Borrower in an aggregate  amount not
to  exceed  the  lesser of (i) the  Committed  Line  minus the then  outstanding
principal  balance of the Advances minus the outstanding  Obligations  under the
Exim  Sub-Facility  or (ii)  the  Borrowing  Base  minus  the  then  outstanding
principal  balance of the Advances minus the outstanding  Obligations  under the
Exim Sub-Facility.  For purposes of this Agreement,  "Borrowing Base" shall mean
an amount equal to (i) One Million Dollars  ($1,000,000),  or (ii)  seventy-five
percent (75%) of Eligible Accounts at any time the aggregate principal amount of
all Advances exceeds One Million Dollars ($1,000,000).  Subject to the terms and
conditions of this Agreement,  amounts borrowed pursuant to this Section 2.1 may
be repaid and reborrowed at any time during the term of this Agreement.

     Whenever  Borrower  desires  an  Advance,  Borrower  will  notify  Bank  by
facsimile  transmission or telephone no later than 3:00 p.m. California time, on
the Business Day that the Advance is to be made. Each such notification shall be
promptly  confirmed  by a  Payment/Advance  Form in  substantially  the  form of
Exhibit B hereto.  Bank is  authorized to make  Advances  under this  Agreement,
based  upon  instructions  received  from  a  Responsible  Officer,  or  without
instructions  if in  Bank's  discretion  such  Advances  are  necessary  to meet
Obligations  which have become due and remain unpaid.  Bank shall be entitled to
rely on any telephonic notice given by a person who Bank reasonably  believes to
be a Responsible  Officer,  and Borrower shall  indemnify and hold Bank harmless
for any damages or loss suffered by Bank as a result of such reliance. Bank will
credit the amount of Advances made under this Section 2.1 to Borrower's  deposit
account.

     The Revolving  Facility shall terminate on the Maturity Date, at which time
all Advances  under this Section 2.1 and other amounts due under this  Agreement
shall be immediately due and payable.

     2.2  Overadvances.  If,  at any  time  or for any  reason,  the  amount  of
Obligations  owed by Borrower to Bank pursuant to Section 2.1 of this  Agreement
and the Exim  Sub-Facility  is greater than the lesser of (i) the Committed Line
or (ii) the Borrowing Base, Borrower shall immediately pay to Bank, in cash, the
amount of such excess.

     2.3 Interest Rates, Payments, and Calculations.

     (a)  Interest  Rate.  Except as set forth in Section  2.3(b),  any Advances
     shall bear interest,  on the average Daily Balance,  at a rate equal to the
     Prime Rate.

     (b) Default Rate. All Obligations  shall bear interest,  from and after the
     occurrence of an Event of Default,  at a rate equal to five (5)  percentage
     points  above  the  interest  rate  applicable  immediately  prior  to  the
     occurrence of the Event of Default.

     (c) Payments. Interest hereunder shall be due and payable on the nineteenth
     calendar  day of each month  during the term  hereof.  Bank  shall,  at its
     option, charge such interest,  all Bank Expenses, and all Periodic Payments
     against any of Borrower's  deposit  accounts or against the Committed Line,
     in which case those amounts shall  thereafter  accrue  interest at the rate
     then  applicable  hereunder.  Any  interest  not  paid  when  due  shall be
     compounded by becoming a part of the  Obligations,  and such interest shall
     thereafter accrue interest at the rate then applicable hereunder.

     (d)  Computation.  In the event the Prime Rate is changed from time to time
     hereafter,  the applicable rate of interest hereunder shall be increased or
     decreased  effective as of 12:01 a.m. on the day the Prime Rate is changed,
     by an  amount  equal  to  such  change  in the  Prime  Rate.  All  interest
     chargeable  under the Loan  Documents  shall be  computed on the basis of a
     three hundred sixty (360) day year for the actual number of days elapsed.

     2.4  Crediting  Payments.  Prior to the  occurrence of an Event of Default,
Bank shall  credit a wire  transfer of funds,  check or other item of payment to
such deposit account or Obligation as Borrower  specifies.  After the occurrence
of an Event of  Default,  the  receipt  by Bank of any wire  transfer  of funds,
check,  or other item of payment shall be immediately  applied to  conditionally
reduce Obligations, but shall not be considered a payment on account unless such
payment is of immediately available federal funds or unless and until such check
or other item of payment is honored when presented for payment.  Notwithstanding
anything  to the  contrary  contained  herein,  any  payment  (other than a wire
transfer  of  immediately  available  funds)  received  by Bank after 12:00 noon
California  time shall be deemed to have been received by Bank as of the opening
of business on the immediately  following  Business Day. Whenever any payment to
Bank  under the Loan  Documents  would  otherwise  be due  (except  by reason of
acceleration)  on a date that is not a Business  Day, such payment shall instead
be due on the next Business Day, and  additional  fees or interest,  as the case
may be, shall accrue and be payable for the period of such extension.

     2.5 Fees. Borrower shall pay to Bank the following:

     (a) Financial  Examination  and Appraisal Fees.  Bank's  customary fees and
     out-of-pocket  expenses for Bank's audits of Borrower's  Accounts,  and for
     each  appraisal of Collateral  and financial  analysis and  examination  of
     Borrower performed from time to time by Bank or its agents,  provided, that
     the amount  charged to Borrower for the initial  annual audit of Borrower's
     Accounts  performed  by  Bank  shall  not  exceed  Twelve  Hundred  Dollars
     ($1,200); and

     (b) Bank Expenses. Upon the date hereof, all Bank Expenses incurred through
     the  date  hereof,  including  reasonable  attorneys'  fees  and  expenses,
     provided,  that the  payment  of  attorneys'  fees and  costs in  excess of
     Eighteen  Hundred  Dollars  ($1,800)  shall  be made as  reasonably  agreed
     between Bank and Borrower.

     2.6  Additional  Costs.  In case any law,  regulation,  treaty or  official
directive  or the  interpretation  or  application  thereof  by any court or any
governmental authority charged with the administration thereof or the compliance
with  any  guideline  or  request  of any  central  bank or  other  governmental
authority (whether or not having the force of law):

     (a)  subjects  Bank to any tax with  respect to  payments of  principal  or
     interest or any other  amounts  payable  hereunder by Borrower or otherwise
     with respect to the transactions  contemplated  hereby (except for taxes on
     the overall net income of Bank  imposed by the United  States of America or
     any political subdivision thereof);

     (b) imposes,  modifies or deems applicable any deposit insurance,  reserve,
     special deposit or similar  requirement against assets held by, or deposits
     in or for the account of, or loans by, Bank; or

     (c) imposes upon Bank any other  condition with respect to its  performance
     under this Agreement,

and the result of any of the  foregoing is to increase the cost to Bank,  reduce
the income  receivable  by Bank or impose any expense  upon Bank with respect to
any loans,  Bank shall notify Borrower  thereof.  Borrower agrees to pay to Bank
the amount of such increase in cost,  reduction in income or additional  expense
as and when such cost,  reduction  or expense is  incurred or  determined,  upon
presentation  by Bank of a  statement  of the amount and  setting  forth  Bank's
calculation  thereof,  all in reasonable detail, which statement shall be deemed
true and correct absent manifest  error;  provided,  however,  that the Borrower
shall not be liable for any such amount  attributable to any period prior to 180
day prior to the date of such certificate.

     2.7 Term.  Subject to Section 12.7, this Agreement  shall become  effective
upon the date  hereof  and shall  continue  in full  force and effect for a term
ending on the Maturity Date.  Notwithstanding the foregoing, Bank shall have the
right  to  terminate  its  obligation  to make  Advances  under  this  Agreement
immediately and without notice upon the occurrence and during the continuance of
an Event of Default.  Borrower  shall have the right to terminate this Agreement
upon payment in full of all  Obligations.  Notwithstanding  termination,  Bank's
Lien on the  Collateral  shall  remain in effect for so long as any  Obligations
(excluding  Obligations  under  Sections  2.6 and 12.2 to the extent they remain
inchoate  at the time  outstanding  payment  Obligations  are paid in full)  are
outstanding.

     3. CONDITIONS OF LOANS

     3.1 Conditions Precedent to Initial Advance. The obligation of Bank to make
the initial  Advance is subject to the condition  precedent that Bank shall have
received, in form and substance satisfactory to Bank, the following:

          (i) this Agreement;

          (ii) a  certificate  of the  Secretary  of  Borrower  with  respect to
          incumbency and  resolutions  authorizing the execution and delivery of
          this Agreement;

          (iii) certified articles of incorporation of Borrower;

          (iv) certificates of good standing of Borrower;

          (v) a collateral assignment, patent mortgage and security agreement;

          (vi) financing statement (Forms UCC-1);

          (vii) insurance certificate;

          (viii)  payment of the fees and Bank  Expenses  then due  specified in
          Section 2.6 hereof;

          (ix) those  agreements  and fees as  specified  in Section  3.1 of the
          Export-Import Bank Amended and Restated Loan and Security Agreement of
          even date herewith; and

          (x) such other  documents,  and completion of such other  matters,  as
          Bank may reasonably deem necessary or appropriate.

     3.2  Conditions  Precedent to all Advances.  The obligation of Bank to make
each Advance, including the initial Advance, is further subject to the following
conditions:

     (a)  timely  receipt by Bank of the  Payment/Advance  Form as  provided  in
     Section 2.1; and

     (b) the representations and warranties contained in Section 5 shall be true
     and  correct  in all  material  respects  on and as of  the  date  of  such
     Payment/Advance  Form and on the  effective  date of each Advance as though
     made  at and as of  each  such  date  (except  to the  extent  they  relate
     specifically  to any earlier date, in which case such  representations  and
     warranties  shall continue to have been true and accurate as of such date),
     and no Potential  Event of Default or Event of Default  shall have occurred
     and be continuing, or would result from such Advance.

     The  making of each  Advance  shall be deemed  to be a  representation  and
warranty by Borrower on the date of such Advance as to the accuracy of the facts
referred to in this Section 3.2(b).

     4. CREATION OF SECURITY INTEREST

     4.1  Grant of  Security  Interest.  Borrower  grants  to Bank a  continuing
security  interest in all presently  existing and hereafter  acquired or arising
Collateral in order to secure prompt repayment of any and all Obligations and in
order to secure  prompt  performance  by Borrower of each of its  covenants  and
duties  under the Loan  Documents.  Except as set  forth in the  Schedule,  such
security interest  constitutes a valid,  first priority security interest in the
presently  existing  Collateral,  and will  constitute a valid,  first  priority
security interest in Collateral acquired after the date hereof, in each case, to
the extent that a security  interest in such  Collateral can be perfected by the
filing  of a  financing  statement,  in the  case of  Collateral  consisting  of
instruments,  documents, chattel paper or certificated securities, to the extent
that Bank takes possession of such Collateral.

     4.2 Delivery of Additional Documentation Required. Borrower shall from time
to time  execute and deliver to Bank,  at the  request of Bank,  all  Negotiable
Collateral,   all  financing  statements  and  other  documents  that  Bank  may
reasonably  request,  in form  satisfactory  to Bank,  to perfect  and  continue
perfected  Bank's  security  interests in the  Collateral  and in order to fully
consummate all of the transactions contemplated under the Loan Documents.

     4.3 Right to Inspect.  Bank  (through any of its  officers,  employees,  or
agents) shall have the right,  upon reasonable  prior notice,  from time to time
during Borrower's usual business hours, to inspect  Borrower's Books and to make
copies  thereof and to check,  test,  and  appraise the  Collateral  in order to
verify Borrower's financial condition or the amount,  condition of, or any other
matter relating to, the Collateral.

     5. REPRESENTATIONS AND WARRANTIES

     Borrower represents and warrants as follows:

     5.1 Due Organization and  Qualification.  Borrower and each Subsidiary is a
corporation  duly existing and in good  standing  under the laws of its state of
incorporation  and  qualified  and  licensed to do  business  in, and is in good
standing in, any state in which the conduct of its business or its  ownership of
property  requires  that it be so  qualified  except  for states as to which any
failure so to qualify would not have a Material Adverse Effect..

     5.2  Due  Authorization;   No  Conflict.   The  execution,   delivery,  and
performance of the Loan Documents are within Borrower's  powers,  have been duly
authorized,  and are  not in  conflict  with  nor  constitute  a  breach  of any
provision  contained in Borrower's Articles of Incorporation or Bylaws, nor will
they  constitute  an event of  default  under any  material  agreement  to which
Borrower is a party or by which  Borrower  is bound.  Borrower is not in default
under  any  agreement  to which it is a party  or by  which it is  bound,  which
default would reasonably be expected to have a Material Adverse Effect.

     5.3 No Prior Encumbrances.  Borrower has good and indefeasible title to the
Collateral, free and clear of Liens, except for Permitted Liens.

     5.4 Bona  Fide  Eligible  Accounts.  The  Eligible  Accounts  are bona fide
existing  obligations.  The property  giving rise to such Eligible  Accounts has
been  delivered  to the  account  debtor or to the  account  debtor's  agent for
immediate  shipment  to and  unconditional  acceptance  by the  account  debtor.
Borrower has not received notice of actual or imminent Insolvency  Proceeding of
any account  debtor the  Accounts of which are  included in any  Borrowing  Base
Certificate as an Eligible Account.

     5.5 Merchantable  Inventory.  All Inventory is in all material  respects of
good and marketable quality, free from all material defects.

     5.6 Name;  Location of Chief Executive  Office.  Except as disclosed in the
Schedule,  Borrower  has not done  business  under  any  name  other  than  that
specified on the signature page hereof.  The chief executive  office of Borrower
is located at the address indicated in Section 10 hereof.

     5.7 Litigation.  Except as set forth in the Schedule,  there are no actions
or proceedings pending (or, to Borrower's  knowledge,  threatened) by or against
Borrower or any Subsidiary before any court or administrative  agency in which a
likely adverse  decision would reasonably be expected to have a Material Adverse
Effect or a material  adverse effect on Borrower's  interest or Bank's  security
interest in the Collateral.

     5.8 No Material  Adverse Change in Financial  Statements.  All consolidated
financial  statements  related to  Borrower  and any  Subsidiary  that have been
delivered by Borrower to Bank fairly present in all material respects Borrower's
consolidated   financial  condition  as  of  the  date  thereof  and  Borrower's
consolidated results of operations for the period then ended. There has not been
a material  adverse change in the consolidated  financial  condition of Borrower
since the date of the most  recent of such  financial  statements  submitted  to
Bank.

     5.9  Solvency.  Borrower  is solvent  and able to pay its debts  (including
trade debts) as they mature.

     5.10  Regulatory  Compliance.  Borrower  and  each  Subsidiary  has met the
minimum funding requirements of ERISA with respect to any employee benefit plans
subject to ERISA.  No event has occurred  resulting from  Borrower's  failure to
comply with ERISA that is reasonably  likely to result in  Borrower's  incurring
any  liability  that would  reasonably  be expected  to have a Material  Adverse
Effect.  Borrower is not an "investment company" or a company "controlled" by an
"investment  company" within the meaning of the Investment  Company Act of 1940.
Borrower is not engaged principally,  or as one of the important activities,  in
the  business  of  extending  credit for the purpose of  purchasing  or carrying
margin  stock  (within  the  meaning of  Regulations  G, T and U of the Board of
Governors of the Federal  Reserve  System).  Borrower has complied  with all the
provisions of the Federal Fair Labor  Standards  Act.  Borrower has not violated
any statutes,  laws,  ordinances or rules  applicable to it,  violation of which
could have a Material Adverse Effect.

     5.11  Environmental  Condition.  None  of  Borrower's  or any  Subsidiary's
properties or assets has ever been used by Borrower or any Subsidiary or, to the
best of Borrower's knowledge,  by previous owners or operators,  in the disposal
of, or to produce,  store, handle, treat,  release, or transport,  any hazardous
waste or hazardous  substance  other than in accordance  with applicable law; to
the best of Borrower's  knowledge,  none of Borrower's  properties or assets has
ever been designated or identified in any manner  pursuant to any  environmental
protection statute as a hazardous waste or hazardous substance disposal site, or
a candidate for closure pursuant to any  environmental  protection  statute;  no
lien  arising  under any  environmental  protection  statute has attached to any
revenues  or to  any  real  or  personal  property  owned  by  Borrower  or  any
Subsidiary;  and neither  Borrower  nor any  Subsidiary  has received a summons,
citation,  notice, or directive from the Environmental  Protection Agency or any
other  federal,  state or other  governmental  agency  concerning  any action or
omission by Borrower or any Subsidiary resulting in the releasing,  or otherwise
disposing of hazardous waste or hazardous substances into the environment.

     5.12 Taxes.  Borrower and each  Subsidiary  has filed or caused to be filed
all  material  tax  returns  required  to be filed,  and has  paid,  or has made
adequate provision for the payment of, all taxes reflected therein.

     5.13 Subsidiaries. Borrower does not own any stock, partnership interest or
other equity securities of any Person, except for Permitted Investments.

     5.14  Government  Consents.  Borrower and each  Subsidiary has obtained all
consents,  approvals and  authorizations  of, made all  declarations  or filings
with, and given all notices to, all governmental  authorities that are necessary
for the continued operation of Borrower's business as currently conducted except
where the failure to obtain any such consent, approval or authorization, to make
any such  declaration or filing or to given any such notice would not reasonably
be expected to have Material Adverse Effect.

     5.15 Intellectual Property. To Borrower's knowledge, Borrower possesses and
owns,  free of any  material  infringement  or other  material  claims  by third
parties,  all  trademarks,  trade names,  copyrights,  patent  rights,  patents,
licenses  that are used in the  conduct  of its  business  as now  operated.  To
Borrower's  knowledge,  there  is no  material  infringement  by  others  of any
trademark, trade name, trade secret, service mark, patent, copyright, license or
other intellectual property right of Borrower.

     5.16 Full Disclosure.  No representation,  warranty or other statement made
by  Borrower  in any  certificate  or  written  statement  furnished  to Bank by
Borrower in connection  with the  transactions  contemplated  by this Agreement,
taken as a whole,  contains any untrue  statement of a material fact or omits to
state a material  fact  necessary in order to make the  statements  contained in
such certificates or statements not misleading (it being recognized by Bank that
the  projections  and forecasts  provided by Borrower are not be viewed as facts
and that  actual  results  during  the  period or  periods  covered  by any such
projections and forecasts may differ from the projected or forecasted results).

     6. AFFIRMATIVE COVENANTS

     Borrower   covenants  and  agrees  that,  until  payment  in  full  of  all
outstanding Obligations, and for so long as Bank may have any commitment to make
an Advance hereunder, Borrower shall do all of the following:

     6.1 Good  Standing.  Borrower  shall maintain or cause to be maintained its
and each of its  Subsidiaries'  corporate  existence  and good  standing  in its
jurisdiction of incorporation and maintain qualification in each jurisdiction in
which the failure to so qualify would  reasonably be expected to have a Material
Adverse  Effect.   Borrower  shall  maintain,   and  shall  cause  each  of  its
Subsidiaries to maintain, in force all licenses,  approvals and agreements,  the
loss of which would reasonably be expected to have a Material Adverse Effect.

     6.2  Government  Compliance.  Borrower  shall  meet,  and shall  cause each
Subsidiary to meet, the minimum  funding  requirements  of ERISA with respect to
any employee  benefit plans subject to ERISA.  Borrower shall comply,  and shall
cause each  Subsidiary  to  comply,  with all  statutes,  laws,  ordinances  and
government  rules and  regulations  to which it is subject,  noncompliance  with
which could have a Material  Adverse Effect or a material  adverse effect on the
Collateral or the priority of Bank's Lien on the Collateral.

     6.3 Financial Statements, Reports, Certificates.  Borrower shall deliver to
Bank:  (a) as soon as  available,  but in any event within fifty (50) days after
the end of each of Borrower's fiscal quarters,  a company prepared  consolidated
balance sheet and income  statement  prepared in  accordance  with GAAP covering
Borrower's consolidated  operations during such period,  certified by an officer
of Borrower reasonably acceptable to Bank; (b) as soon as available,  but in any
event  within  ninety-five  (95) days after the end of  Borrower's  fiscal year,
audited  consolidated  financial  statements of Borrower  prepared in accordance
with GAAP,  consistently  applied,  together with an unqualified opinion on such
financial  statements  of  an  independent   certified  public  accounting  firm
reasonably  acceptable to Bank;  (c) within five (5) Business Days upon becoming
available, copies of all statements,  reports and notices sent or made available
generally by Borrower to its security  holders or to any holders of Subordinated
Debt and all reports on Form 8-K,  10-K and 10-Q (without  exhibits)  filed with
the  Securities  and Exchange  Commission;  (d) promptly  upon receipt of notice
thereof, a report of any legal actions pending or threatened against Borrower or
any Subsidiary  that would  reasonably be expected to result in damages or costs
to Borrower or any  Subsidiary  of One Hundred  Thousand  Dollars  ($100,000) or
more;  and (e)  such  budgets,  sales  projections,  operating  plans  or  other
financial information as Bank may reasonably request from time to time.

     Within  twenty  (20)  days  after  the  last  day of each  month  in  which
outstanding  Advances  exceed One Million Dollars  ($1,000,000),  Borrower shall
deliver to Bank a Borrowing Base Certificate signed by a Responsible  Officer in
substantially  the form of  Exhibit C hereto,  together  with aged  listings  of
accounts receivable and accounts payable.

     Borrower  shall deliver to Bank with the quarterly  financial  statements a
Compliance Certificate signed by a Responsible Officer in substantially the form
of Exhibit D hereto.

     Bank  shall have a right from time to time  hereafter  to audit  Borrower's
Accounts.

     6.4  Inventory;  Returns.  Borrower  shall keep all  Inventory  in good and
marketable condition, free from all material defects. Returns and allowances, if
any, as between  Borrower and its account debtors shall be on the same basis and
in accordance with the usual customary  practices of Borrower,  as they exist at
the  time of the  execution  and  delivery  of this  Agreement.  Borrower  shall
promptly  notify Bank of all  returns and  recoveries  and of all  disputes  and
claims,  where the return,  recovery,  dispute or claim  involves  more than Two
Hundred Thousand Dollars ($200,000).

     6.5 Taxes.  Borrower shall make,  and shall cause each  Subsidiary to make,
due and timely  payment or deposit of all  material  federal,  state,  and local
taxes, assessments, or contributions required of it by law, and will execute and
deliver to Bank, on demand, appropriate certificates attesting to the payment or
deposit thereof; and Borrower will make, and will cause each Subsidiary to make,
timely  payment or deposit of all material tax  payments and  withholding  taxes
required of it by  applicable  laws,  including,  but not limited to, those laws
concerning F.I.C.A.,  F.U.T.A., state disability,  and local, state, and federal
income taxes,  and will, upon request,  furnish Bank with proof  satisfactory to
Bank  indicating  that  Borrower  or a  Subsidiary  has made  such  payments  or
deposits;  provided that  Borrower or a Subsidiary  need not make any payment if
the amount or validity of such payment is contested in good faith by appropriate
proceedings  and is  reserved  against  (to the  extent  required  by  GAAP)  by
Borrower.

     6.6 Insurance.

     (a) Borrower,  at its expense,  shall keep the Collateral  insured  against
     loss or damage by fire, theft, explosion, sprinklers, and all other hazards
     and risks,  and in such  amounts,  as ordinarily  insured  against by other
     owners in similar  businesses  conducted in the locations where  Borrower's
     business is  conducted  on the date hereof.  Borrower  shall also  maintain
     insurance  relating to Borrower's  ownership  and use of the  Collateral in
     amounts  and  of a  type  that  are  customary  to  businesses  similar  to
     Borrower's.

     (b) All such  policies  of  insurance  shall  be in such  form,  with  such
     companies, and in such amounts as reasonably satisfactory to Bank. All such
     policies  of  property  insurance  shall  contain a lender's  loss  payable
     endorsement,  in a form satisfactory to Bank, showing Bank as an additional
     loss payee thereof and all liability insurance policies shall show the Bank
     as an additional  insured,  and shall specify that the insurer must give at
     least twenty (20) days notice to Bank before  canceling  its policy for any
     reason.  Upon Bank's  request,  Borrower  shall  deliver to Bank  certified
     copies of such  policies of  insurance  and evidence of the payments of all
     premiums  therefor.  So long as no Event of  Default  has  occurred  and is
     continuing,  Borrower shall have the option of applying the proceeds of any
     casualty  policy  to the  replacement  or repair of  destroyed  or  damaged
     property; provided, that after the occurrence and during the continuance of
     an Event of Default,  all proceeds  payable under any such casualty  policy
     shall,  at the option of Bank,  be payable to Bank for  application  to the
     Obligations.

     6.7 Principal Depository.  Borrower shall maintain its principal depository
and operating accounts with Bank.

     6.8 Quick Ratio.  Borrower  shall  maintain,  as of the last day of each of
Borrower's fiscal quarters,  a ratio of Quick Assets to Current Liabilities less
deferred revenues of at least 1.25 to 1.00.

     6.9 Debt-Tangible Net Worth Ratio.  Borrower shall maintain, as of the last
day of each of Borrower's  fiscal  quarters,  a ratio of Total  Liabilities less
Subordinated  Debt and deferred revenues to Tangible Net Worth plus Subordinated
Debt of not more than 1.50 to 1.00.

     6.10 Tangible Net Worth.  Borrower  shall  maintain,  as of the last day of
each of Borrower's fiscal quarters,  a Tangible Net Worth of not less than Seven
Million Dollars ($7,000,000).

     6.11 Debt-Service Coverage.  Borrower shall maintain, as of the last day of
each of Borrower's fiscal quarters,  a ratio of (a) earnings before interest and
taxes plus depreciation and amortization to (b) interest plus current portion of
long term debt of at least 1.75 to 1.00.

     6.12 Registration of Intellectual Property Rights.  Borrower shall register
or cause to be registered (to the extent not already registered) with the United
States Patent and Trademark  Office or the United States  Copyright  Office,  as
applicable,  those intellectual property rights listed on Exhibits A, B and C to
the Collateral  Assignment,  Patent Mortgage and Security Agreement delivered to
Bank by Borrower in connection  with this  Agreement  within ninety (90) days of
the date of this  Agreement.  Borrower  shall register or cause to be registered
with the  United  States  Patent  and  Trademark  Office  or the  United  States
Copyright Office, as applicable, those additional material intellectual property
rights  developed or acquired by Borrower from time to time in  connection  with
any product  prior to the sale or  licensing of such product to any third party,
including without limitation revisions or additions to the intellectual property
rights listed on such  Exhibits A, B and C.  Borrower  shall execute and deliver
such  additional  instruments  and  documents  from  time to time as Bank  shall
reasonably  request to  perfect  Bank's  security  interest  in such  additional
intellectual property rights.

     6.13 Further  Assurances.  At any time and from time to time Borrower shall
execute and deliver such further instruments and take such further action as may
reasonably be requested by Bank to effect the purposes of this Agreement.

     7. NEGATIVE COVENANTS

     Borrower  covenants and agrees that,  without the prior written  consent of
Bank,  which Bank may grant or withhold in its sole  discretion,  so long as any
credit hereunder shall be available and until payment in full of the outstanding
Obligations or for so long as Bank may have any commitment to make any Advances,
Borrower will not do any of the following:

     7.1 Dispositions.  Convey,  sell,  lease,  transfer or otherwise dispose of
(collectively, a "Transfer"), or permit any of its Subsidiaries to Transfer, all
or any part of its business or property,  other than: (i) Transfers of Inventory
in the ordinary course of business; (ii) Transfers of non-exclusive licenses and
similar   arrangements   for  the  use  of  the  property  of  Borrower  or  its
Subsidiaries;  (iii)  Transfers  of  worn-out  or  obsolete  Equipment;  or (iv)
Transfers which  constitute  liquidation of Investments  permitted under Section
7.7.

     7.2  Change in  Business.  Engage  in any  business,  or permit  any of its
Subsidiaries  to engage in any  business,  other than the  businesses  currently
engaged in by Borrower and any business substantially similar or related thereto
(or incidental  thereto),  or suffer a material change in Borrower's  ownership,
other than the sale by Borrower of equity securities of Borrower.  Borrower will
not, without thirty (30) days prior written  notification to Bank,  relocate its
chief executive office.

     7.3 Mergers or  Acquisitions.  Merge or  consolidate,  or permit any of its
Subsidiaries  to  merge  or  consolidate,   with  or  into  any  other  business
organization,  or acquire, or permit any of its Subsidiaries to acquire,  all or
substantially  all of the capital  stock or property of another  Person,  except
that Borrower may acquire, or permit any of its Subsidiaries to acquire,  all or
substantially  all of the capital stock or property of another  Person  provided
that (i) the aggregate amount of  consideration of any type (including,  but not
limited to, cash, cash equivalents,  or stock) for such acquisitions  shall not,
between the date of this Agreement and the Maturity Date, exceed Fifteen Million
Dollars ($15,000,000), and (ii) the aggregate amount of cash or cash equivalents
paid by Borrower  for such  acquisitions  shall not exceed,  between the date of
this agreement and the Maturity Date, Three Million Dollars ($3,000,000).

     7.4 Indebtedness. Create, incur, assume or be or remain liable with respect
to any  Indebtedness,  or permit any  Subsidiary so to do, other than  Permitted
Indebtedness.

     7.5 Encumbrances.  Create,  incur,  assume or suffer to exist any Lien with
respect  to any of its  property,  or assign or  otherwise  convey  any right to
receive  income,  including  the  sale of any  Accounts,  or  permit  any of its
Subsidiaries so to do, except for Permitted Liens.

     7.6  Distributions.  Pay any  dividends or make any other  distribution  or
payment on account of or in  redemption,  retirement  or purchase of any capital
stock  except for  repurchases  of stock from  former  employees  of Borrower in
accordance with the terms of repurchase or similar  agreements  between Borrower
and such employees in an aggregate amount in any fiscal year not to exceed Fifty
Thousand Dollars ($50,000).

     7.7  Investments.  Directly  or  indirectly  acquire  or own,  or make  any
Investment  in or to any  Person,  or permit any of its  Subsidiaries  so to do,
other than Permitted Investments.

     7.8  Transactions  with  Affiliates.  Directly or indirectly  enter into or
permit to exist any material  transaction  with any Affiliate of Borrower except
(i) for  transactions  that are in the ordinary  course of Borrower's  business,
upon fair and reasonable terms that are no less favorable to Borrower than would
be obtained in an arm's length  transaction  with a nonaffiliated  Person,  (ii)
transactions  with a  Subsidiary  that are upon  fair and  reasonable  terms and
transactions  constituting  Permitted  Investments,  and (iii) transactions with
Affiliates  who in  addition  to  being  Affiliates  are also  customers  of the
Borrower and who receive,  as customers,  terms more  favorable than the general
public.

     7.9  Subordinated  Debt.  Make any  payment in respect of any  Subordinated
Debt,  or permit any of its  Subsidiaries  to make any such  payment,  except in
compliance  with the terms of such  Subordinated  Debt,  or amend any  provision
contained in any documentation  relating to the Subordinated Debt without Bank's
prior written consent.

     7.10 Inventory. Store the Inventory with a bailee, warehouseman, or similar
party unless Bank has received a pledge of the warehouse  receipt  covering such
Inventory.  Except for  Inventory  sold in the  ordinary  course of  business or
demonstration  Inventory  that is stored at the  location of the customer of the
Borrower not to exceed Two Hundred and Fifty  Thousand  Dollars  ($250,000)  and
except for such other  locations as Bank may approve in writing,  Borrower shall
keep the Inventory only at the location set forth in Section 10 hereof or in the
Schedule and such other  locations of which  Borrower  gives Bank prior  written
notice and as to which  Borrower  signs and files a  financing  statement  where
needed to perfect Bank's security interest.

     7.11  Compliance.   Become  an  "investment   company"   controlled  by  an
"investment  company," within the meaning of the Investment Company Act of 1940,
or  become  principally  engaged  in,  or  undertake  as one  of  its  important
activities,  the business of extending  credit for the purpose of  purchasing or
carrying margin stock, or use the proceeds of any Advance for such purpose. Fail
to meet the minimum funding  requirements of ERISA, permit a Reportable Event or
Prohibited  Transaction,  as defined in ERISA, to occur, fail to comply with the
Federal  Fair  Labor  Standards  Act or  violate  any law or  regulation,  which
violation could have a Material  Adverse Effect or a material  adverse effect on
the Collateral or the priority of Bank's Lien on the  Collateral,  or permit any
of its Subsidiaries to do any of the foregoing.

     8. EVENTS OF DEFAULT

     Any one or more of the  following  events  shall  constitute  an  Event  of
Default by Borrower under this Agreement:

     8.1 Payment  Default.  If Borrower  fails to pay the  principal  of, or any
interest on, any Advances  when due and payable;  or fails to pay any portion of
any other  Obligations not  constituting  such principal or interest,  including
without limitation Bank Expenses, within thirty (30) days of receipt by Borrower
of an invoice therefor;

     8.2 Covenant Default. If Borrower fails to perform any obligation under any
of Sections 6.7, 6.8, 6.9,  6.10,  6.11 or 6.12 or violates any of the covenants
contained in Article 7 of this Agreement, or fails or neglects to perform, keep,
or observe any other material term, provision, condition, covenant, or agreement
contained  in this  Agreement,  in any of the Loan  Documents,  or in any  other
present or future  agreement  between  Borrower  and Bank and as to any  default
under such other term, provision,  condition,  covenant or agreement that can be
cured,  has failed to cure such default  within thirty (30) days after  Borrower
receives  notice thereof or any  Responsible  Officer of Borrower  becomes aware
thereof;  provided,  however,  that if the default cannot by its nature be cured
within the ten (10) day period or cannot after diligent  attempts by Borrower be
cured  within such ten (10) day period,  and such  default is likely to be cured
within a reasonable  time,  then Borrower  shall have an  additional  reasonable
period  (which shall not in any case exceed thirty (30) days) to attempt to cure
such default,  and within such  reasonable time period the failure to have cured
such default shall not be deemed an Event of Default  (provided that no Advances
will be required to be made during such cure period);

     8.3 Material  Adverse Change.  If there occurs a material adverse change in
Borrower's business or financial condition, or if there is a material impairment
of the  prospect of repayment  of any portion of the  Obligations  or a material
impairment  of the  value  or  priority  of  Bank's  security  interests  in the
Collateral;

     8.4 Attachment.  If any material portion of Borrower's  assets is attached,
seized,  subjected to a writ or distress  warrant,  or is levied upon,  or comes
into the  possession  of any  trustee,  receiver  or person  acting in a similar
capacity and such attachment,  seizure, writ or distress warrant or levy has not
been removed,  discharged or rescinded  within fifteen (15) days, or if Borrower
is enjoined,  restrained, or in any way prevented by court order from continuing
to conduct all or any material part of its business affairs, or if a judgment or
other  claim  becomes  a lien  or  encumbrance  upon  any  material  portion  of
Borrower's  assets,  or if a notice of lien,  levy,  or  assessment  is filed of
record with respect to any of Borrower's assets by the United States Government,
or any department,  agency, or instrumentality thereof, or by any state, county,
municipal,  or governmental agency, and the same is not paid within fifteen (15)
days after Borrower receives notice thereof, provided that none of the foregoing
shall  constitute an Event of Default where such action or event is stayed or an
adequate bond has been posted pending a good faith contest by Borrower (provided
that no Advances will be required to be made during such cure period);

     8.5  Insolvency.  If  Borrower  becomes  insolvent,  or  if  an  Insolvency
Proceeding is commenced by Borrower, or if an Insolvency Proceeding is commenced
against  Borrower  and is not  dismissed  or  stayed  within  thirty  (30)  days
(provided  that  no  Advances  will  be  made  prior  to the  dismissal  of such
Insolvency Proceeding);

     8.6 Other  Agreements.  If there is a  default  in any  agreement  to which
Borrower is a party with a third party or parties  resulting  in a right by such
third party or parties,  whether or not exercised, to accelerate the maturity of
any  Indebtedness  in an  amount  in  excess  of One  Hundred  Thousand  Dollars
($100,000)  or that would  reasonably  be  expected  to have a Material  Adverse
Effect;

     8.7  Judgments.  If a judgment or judgments  for the payment of money in an
amount,  individually  or in the  aggregate,  of at least One  Hundred  Thousand
Dollars   ($100,000)  shall  be  rendered  against  Borrower  and  shall  remain
unsatisfied  and unstayed for a period of forty-five (45) days (provided that no
Advances will be made prior to the satisfaction or stay of such judgment); or

     8.8  Misrepresentations.  If any  material  misrepresentation  or  material
misstatement exists now or hereafter in any warranty or representation set forth
herein  or in any  certificate  delivered  to  Bank by any  Responsible  Officer
pursuant to this Agreement or to induce Bank to enter into this Agreement or any
other Loan Document.

     9. BANK'S RIGHTS AND REMEDIES

     9.1 Rights and Remedies.  Upon the occurrence and during the continuance of
an Event of Default,  Bank may, at its election,  without notice of its election
and  without  demand,  do any one or more of the  following,  all of  which  are
authorized by Borrower:

     (a) Declare all Obligations, whether evidenced by this Agreement, by any of
     the  other  Loan  Documents,  or  otherwise,  immediately  due and  payable
     (provided  that upon the  occurrence  of an Event of Default  described  in
     Section  8.5 all  Obligations  shall  become  immediately  due and  payable
     without any action by Bank);

     (b) Cease  advancing  money or  extending  credit to or for the  benefit of
     Borrower under this Agreement or under any other agreement between Borrower
     and Bank;

     (c) Settle or adjust  disputes and claims directly with account debtors for
     amounts,  upon terms and in whatever order that Bank  reasonably  considers
     advisable;

     (d) Without  notice to or demand upon  Borrower,  make such payments and do
     such acts as Bank considers necessary or reasonable to protect its security
     interest in the  Collateral.  Borrower agrees to assemble the Collateral if
     Bank so requires,  and to make the Collateral available to Bank as Bank may
     designate.  Borrower  authorizes  Bank to  enter  the  premises  where  the
     Collateral is located,  to take and maintain  possession of the Collateral,
     or any  part of it,  and to  pay,  purchase,  contest,  or  compromise  any
     encumbrance,  charge, or lien which in Bank's  determination  appears to be
     prior or superior to its security interest and to pay all expenses incurred
     in connection therewith.  With respect to any of Borrower's owned premises,
     Borrower  hereby  grants  Bank a license to enter into  possession  of such
     premises  and to occupy the same,  without  charge,  for up to one  hundred
     twenty  (120) days in order to  exercise  any of Bank's  rights or remedies
     provided herein, at law, in equity, or otherwise;

     (e) Without notice to Borrower,  set off and apply to the  Obligations  any
     and all (i)  balances  and  deposits  of  Borrower  held by  Bank,  or (ii)
     indebtedness  at any time  owing to or for the  credit  or the  account  of
     Borrower held by Bank;

     (f) Ship, reclaim,  recover, store, finish,  maintain,  repair, prepare for
     sale,  advertise for sale, and sell (in the manner provided for herein) the
     Collateral.  Bank is  hereby  granted  a  license  or other  right,  solely
     pursuant to the  provisions  of this Section 9.1, to use,  without  charge,
     Borrower's labels,  patents,  copyrights,  rights of use of any name, trade
     secrets, trade names, trademarks, service marks, and advertising matter, or
     any  property of a similar  nature,  as it pertains to the  Collateral,  in
     completing  production of, advertising for sale, and selling any Collateral
     and, in  connection  with Bank's  exercise of its rights under this Section
     9.1,  Borrower's  rights under all licenses  and all  franchise  agreements
     shall inure to Bank's benefit;

     (g) Sell the Collateral at either a public or private sale, or both, by way
     of one or more  contracts or  transactions,  for cash or on terms,  in such
     manner  and  at  such  places  (including   Borrower's  premises)  as  Bank
     determines is commercially reasonable;

     (h) Bank may credit bid and purchase at any public sale; and

     (i) Any  deficiency  that exists after  disposition  of the  Collateral  as
     provided above will be paid immediately by Borrower.

     9.2 Power of Attorney.  Effective  only upon the  occurrence and during the
continuance of an Event of Default,  Borrower hereby  irrevocably  appoints Bank
(and any of Bank's  designated  officers,  or employees) as Borrower's  true and
lawful  attorney to: (a) send  requests for  verification  of Accounts or notify
account  debtors  of Bank's  security  interest  in the  Accounts;  (b)  endorse
Borrower's  name on any checks or other  forms of payment or  security  that may
come into Bank's possession;  (c) sign Borrower's name on any invoice or bill of
lading relating to any Account,  drafts against account  debtors,  schedules and
assignments  of  Accounts,  verifications  of  Accounts,  and notices to account
debtors;  (d) make,  settle,  and  adjust all claims  under and  decisions  with
respect to Borrower's policies of insurance;  and (e) settle and adjust disputes
and claims  respecting the accounts  directly with account debtors,  for amounts
and upon  terms  which  Bank  determines  to be  reasonable;  provided  Bank may
exercise  such  power of  attorney  to sign the name of  Borrower  on any of the
documents described in Section 4.2 regardless of whether an Event of Default has
occurred.  The appointment of Bank as Borrower's  attorney in fact, and each and
every one of Bank's  rights and  powers,  being  coupled  with an  interest,  is
irrevocable  until all of the  Obligations  have been  fully  repaid  and Bank's
obligation to provide Advances hereunder is terminated.

     9.3 Accounts Collection. Upon the occurrence and during the continuation of
an Event of  Default,  Bank may notify any Person  owing  funds to  Borrower  of
Bank's security interest in such funds. Borrower shall collect all amounts owing
to  Borrower  for Bank,  receive in trust all  payments as Bank's  trustee,  and
immediately  deliver such  payments to Bank in their  original  form as received
from the account debtor, with proper endorsements for deposit.

     9.4 Bank  Expenses.  If  Borrower  fails to pay any  amounts or furnish any
required  proof of payment due to third persons or entities,  as required  under
the terms of this Agreement,  then Bank may do any or all of the following:  (a)
make payment of the same or any part  thereof;  (b) set up such  reserves in the
Collateral  Account or under the Revolving  Facility as Bank deems  necessary to
protect  Bank from the  exposure  created  by such  failure;  or (c)  obtain and
maintain  insurance  policies  of the  type  discussed  in  Section  6.6 of this
Agreement,  and take any  action  with  respect to such  policies  as Bank deems
prudent.  Any  amounts  so  paid or  deposited  by Bank  shall  constitute  Bank
Expenses,  shall be immediately due and payable,  and shall bear interest at the
then  applicable  rate  hereinabove  provided,  and  shall  be  secured  by  the
Collateral.  Any payments made by Bank shall not constitute an agreement by Bank
to make  similar  payments  in the  future  or a waiver  by Bank of any Event of
Default under this Agreement.

     9.5 Bank's  Liability  for  Collateral.  So long as Bank  complies with its
obligations  under Section 9207 of the Code, Bank shall not in any way or manner
be liable or responsible  for: (a) the  safekeeping of the  Collateral;  (b) any
loss or damage  thereto  occurring  or arising in any manner or fashion from any
cause; (c) any diminution in the value thereof; or (d) any act or default of any
carrier,  warehouseman,  bailee,  forwarding agency, or other person whomsoever.
Subject  to the  foregoing,  all  risk of loss,  damage  or  destruction  of the
Collateral shall be borne by Borrower.

     9.6 Remedies  Cumulative.  Bank's rights and remedies under this Agreement,
the Loan Documents,  and all other  agreements  shall be cumulative.  Bank shall
have all other rights and remedies not  inconsistent  herewith as provided under
the Code, by law, or in equity. No exercise by Bank of one right or remedy shall
be  deemed  an  election,  and no  waiver  by Bank of any  Event of  Default  on
Borrower's  part  shall be deemed a  continuing  waiver.  No delay by Bank shall
constitute a waiver, election, or acquiescence by it. No waiver by Bank shall be
effective unless made in a written document signed on behalf of Bank.

     9.7 Demand;  Protest.  Borrower waives demand,  protest, notice of protest,
notice of  dishonor,  notice of payment and  nonpayment,  notice of any default,
nonpayment at maturity, release, compromise,  settlement,  extension, or renewal
of accounts, documents,  instruments,  chattel paper, and guarantees at any time
held by Bank on which Borrower may in any way be liable.

     10. NOTICES

     Unless otherwise provided in this Agreement,  all notices or demands by any
party  relating  to  this  Agreement  or any  other  agreement  entered  into in
connection herewith shall be in writing and (except for financial statements and
other  informational  documents which may be sent by first-class  mail,  postage
prepaid)  shall  be  personally  delivered  or  sent by a  recognized  overnight
delivery service,  certified mail, postage prepaid, return receipt requested, or
by  telefacsimile  to Borrower or to Bank,  as the case may be, at its addresses
set forth below:

         If to Borrower:       Castelle
                               3255-3 Scott Boulevard
                               Santa Clara, CA  95054
                               Attn:  Mr. Randall Bambrough
                               FAX:  (408) 496-0502

         If to Bank:           Silicon Valley Bank
                               3003 Tasman Drive
                               Santa Clara, CA  95054
                               Attn: Mr. Peter Kidder
                               FAX:  (408) 727-8728

     The  parties  hereto may  change  the  address at which they are to receive
notices  hereunder,  by notice in writing in the  foregoing  manner given to the
other.

     11. CHOICE OF LAW AND VENUE; JURY TRIAL WAIVER

     This Agreement shall be governed by, and construed in accordance  with, the
internal  laws of the  State of  California,  without  regard to  principles  of
conflicts  of law.  Each of Borrower  and Bank hereby  submits to the  exclusive
jurisdiction  of the state and  Federal  courts  located  in the County of Santa
Clara, State of California.  BORROWER AND BANK EACH HEREBY WAIVES ITS RESPECTIVE
RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT
OF ANY OF THE LOAN DOCUMENTS OR ANY OF THE  TRANSACTIONS  CONTEMPLATED  THEREIN,
INCLUDING  CONTRACT CLAIMS,  TORT CLAIMS,  BREACH OF DUTY CLAIMS,  AND ALL OTHER
COMMON LAW OR  STATUTORY  CLAIMS.  EACH  PARTY  RECOGNIZES  AND AGREES  THAT THE
FOREGOING  WAIVER  CONSTITUTES A MATERIAL  INDUCEMENT  FOR IT TO ENTER INTO THIS
AGREEMENT.  EACH PARTY  REPRESENTS AND WARRANTS THAT IT HAS REVIEWED THIS WAIVER
WITH ITS LEGAL  COUNSEL AND THAT IT KNOWINGLY  AND  VOLUNTARILY  WAIVES ITS JURY
TRIAL RIGHTS FOLLOWING CONSULTATION WITH LEGAL COUNSEL.

     12. GENERAL PROVISIONS

     12.1 Successors and Assigns.

     (a) This  Agreement  shall bind and inure to the benefit of the  respective
     successors and permitted assigns of each of the parties; provided, however,
     that neither this  Agreement  nor any rights  hereunder  may be assigned by
     Borrower without Bank's prior written consent, which consent may be granted
     or withheld in Bank's sole  discretion.  Bank shall have the right  without
     the consent of or notice to Borrower to sell, transfer, negotiate, or grant
     participations   in  all  or  any  part  of,  or  any  interest  in  Bank's
     obligations, rights and benefits hereunder.

     (b) Bank may sell,  negotiate or grant  participations  to other  financial
     institutions in all or part of the obligations of the Borrower  outstanding
     under the Loan  Agreements,  without notice to or the approval of Borrower;
     provided  that any such  sale,  negotiation  or  participation  shall be in
     compliance  with the applicable  federal and state  securities laws and the
     other  requirements  of  this  Section  12.1.   Notwithstanding  the  sale,
     negotiation   or  grant  of   participations,   Bank  shall  remain  solely
     responsible for the  performance of its  obligations  under this Agreement,
     Bank  shall  remain  the  holder of the Note for all  purposes  under  this
     Agreement and Borrower shall continue to deal solely and directly with Bank
     in connection with this Agreement and the other Loan Documents.

     (c) The grant of a  participation  interest  shall be on such  terms as the
     Bank determines are appropriate,  provided only that (i) the holder of such
     participation  interest shall not have any of the rights of Bank under this
     Agreement  except, if the  participation  agreement so provides,  rights to
     demand the payment of costs of the type described in Section 2.7,  provided
     that the aggregate  amount that the Borrower shall be required to pay under
     Section 2.7 with respect to any ratable share of the Committed  Line or any
     Advance  (including  amounts  paid to  participants)  shall not  exceed the
     amount that Borrower would have had to pay if no  participation  agreements
     had been  entered  into,  and  (ii) the  consent  of the  holder  of such a
     participation  interest  shall not be required for amendments or waivers of
     provisions  of the Loan  Agreement  other than those which (A) increase the
     amount of the Committed  Line, (B) extend the term of this  Agreement,  (C)
     decrease  the rate of interest or the amount of any fee or any other amount
     payable to Bank  under this  Agreement,  (D)  reduce the  principal  amount
     payable under this Agreement,  or (E) extend the date fixed for the payment
     of principal or interest or any other amount payable under this Agreement.

     (d) The Bank may assign,  from time to time,  all or any portion of its pro
     rata share of the  Committed  Line and the Note to an Affiliate of the Bank
     or, subject to the prior written  approval of Borrower (which approval will
     not  be  unreasonably   withheld),  to  any  other  financial  institution;
     provided, that (i) the amount the Committed Line being assigned pursuant to
     each such  assignment  shall in no event be less than Three Million Dollars
     ($3,000,000)  and shall be an integral  multiple of Five  Hundred  Thousand
     Dollars  ($500,000)  and (ii) the  parties  to each such  assignment  shall
     execute  and  deliver  to  Borrower  an  assignment  agreement  in  a  form
     reasonably  acceptable to each. Upon such execution and delivery,  from and
     after the effective  date  specified in such  assignment  agreement (x) the
     assignee  thereunder shall be a party hereto and, to the extent that rights
     and  obligations  hereunder  have  been  assigned  to it  pursuant  to such
     assignment  agreement,  have the rights and obligations of a Bank hereunder
     and (y) Bank shall,  to the extent that  rights and  obligations  hereunder
     have been assigned by it pursuant to such assignment agreement,  relinquish
     its rights and be released from its obligations under this Agreement (other
     than  pursuant to this Section  12.1(d),  and, in the case of an assignment
     agreement  covering  all or the  remaining  portion  of Bank's  rights  and
     obligations under this Agreement, Bank shall cease to be a party hereto. In
     the event of an  assignment  hereunder,  the  parties  agree to amend  this
     Agreement to the extent  necessary to reflect the mechanical  changes which
     are  necessary  to document  such  assignment  and which are standard for a
     multi-bank  credit  facility.  Each  party  shall  bear  its  own  expenses
     (including  without  limitation  attorneys' fees and costs) with respect to
     such an amendment,  provided  that Borrower  shall not be required to incur
     expenses for any amendment requested solely by Bank.

     12.2  Indemnification.  Borrower shall defend,  indemnify and hold harmless
Bank and its  officers,  employees,  and agents  against:  (a) all  obligations,
demands,  claims,  and  liabilities  claimed or  asserted  by any other party in
connection with the  transactions  contemplated  by this Agreement;  and (b) all
losses or Bank  Expenses  in any way  suffered,  incurred,  or paid by Bank as a
result  of or in  any  way  arising  out  of,  following,  or  consequential  to
transactions  between  Bank  and  Borrower  whether  under  this  Agreement,  or
otherwise (including without limitation reasonable attorneys fees and expenses),
except for losses caused by Bank's gross negligence or willful misconduct.

     12.3 Time of Essence.  Time is of the essence  for the  performance  of all
obligations set forth in this Agreement.

     12.4 Severability of Provisions.  Each provision of this Agreement shall be
severable  from every  other  provision  of this  Agreement  for the  purpose of
determining the legal enforceability of any specific provision.

     12.5 Amendments in Writing,  Integration.  This Agreement cannot be amended
or terminated  orally.  All prior agreements,  understandings,  representations,
warranties,  and  negotiations  between the parties  hereto with  respect to the
subject matter of this Agreement, if any, are merged into this Agreement and the
Loan  Documents  except for that certain  Amended and Restated  Promissory  Note
evidencing a Five Hundred Thousand Dollar ($500,000) equipment line of credit of
even  date  herewith,  any  financing  statements  filed by Bank to  secure  any
Obligations  of Borrower to Bank,  and filing by Bank relating to the Borrower's
intellectual  property to secure any  Obligations  of  Borrower  to Bank,  which
documents, statements and filings shall remain in full force and effect.

     12.6  Counterparts.  This  Agreement  may  be  executed  in any  number  of
counterparts and by different parties on separate  counterparts,  each of which,
when  executed  and  delivered,  shall be deemed to be an  original,  and all of
which, when taken together, shall constitute but one and the same Agreement.

     12.7 Survival.  All covenants,  representations and warranties made in this
Agreement  shall  continue  in full force and effect so long as any  Obligations
(excluding  Obligations  under  Sections  2.6 and 12.2 to the extent they remain
inchoate  at the time that  outstanding  payment  Obligations  are paid in full)
remain  outstanding.  The obligations of Borrower to indemnify Bank with respect
to the expenses,  damages,  losses,  costs and liabilities  described in Section
12.2 shall  survive until all  applicable  statute of  limitations  periods with
respect to actions that may be brought  against Bank have run,  provided that so
long as the  obligations  set forth in the first  sentence of this  Section 12.7
have been satisfied,  and Bank has no commitment to make any Advances or to make
any other loans to Borrower,  Bank shall release all security  interests granted
hereunder and redeliver all Collateral  held by it in accordance with applicable
law.

     12.8 Effect of Amendment and  Restatement.  Subject to Section  12.5,  this
Agreement  is  intended  to and  does  completely  amend  and  restate,  without
novation, that certain Amended and Restated Loan and Security Agreement dated as
of February 9, 1994,  between  Borrower  and Bank,  as amended,  (the  "Original
Agreement").  All advances or loans outstanding under the Original Agreement are
and  shall  continue  to be  outstanding  under  this  Agreement.  All  security
interests granted under the Original Agreement are hereby confirmed and ratified
and shall continue to secure all Obligations under this Agreement.

     12.9 Confidentiality.  In handling any confidential  information Bank shall
exercise  the same  degree of care that it  exercises  with  respect  to its own
proprietary information of the same types to maintain the confidentiality of any
non-public  information  thereby received or received pursuant to this Agreement
except that disclosure of such  information may be made (i) to the  subsidiaries
or affiliates of Bank in connection  with their present or prospective  business
relations  with Borrower,  (ii) to prospective  transferees or purchasers of any
interest  in the  Loans,  provided  that they  have  entered  into a  comparable
confidentiality  agreement  in favor of  Borrower  and have  delivered a copy to
Borrower,  (iii) as  required  by law,  regulations,  rule or  order,  subpoena,
judicial  order or similar order and (iv) as may be required in connection  with
the  examination,   audit  or  similar   investigation  of  Bank.   Confidential
information  hereunder shall not include  information that either: (a) is in the
public domain or in the knowledge or possession of Bank when  disclosed to Bank,
or becomes part of the public  domain after  disclosure to Bank through no fault
of Bank;  or (b) is disclosed  to the Bank by a third  party,  provided the Bank
does not have  actual  knowledge  that  such  third  party  is  prohibited  from
disclosing such information.  Notwithstanding any provision of this Agreement to
the contrary,  neither Borrower nor any of its Subsidiaries  will be required to
disclose, permit the inspection,  examination, copying or making extracts of, or
discussions of, any document,  information or other matter that (i) prior to the
occurrence of an Event of Default  constitutes  non-financial  trade secrets, or
(ii) in respect to which disclosure to the Banks (or designated  representative)
is then prohibited by (a) law, or (b) an agreement  binding upon Borrower or any
Subsidiary  that was not entered  into by Borrower  or such  Subsidiary  for the
primary purpose of concealing information from Banks.

     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
executed as of the date first above written.

                                    CASTELLE



              By:                   /s/ Randall I. Bambrough
                                    ---------------------------------
                                    Randall I. Bambrough

              Title:                Vice President of Finance
                                    --------------------------------





              SILICON VALLEY BANK



              By:                   /s/ Peter A. Kidder
                                    -------------------------
                                    Peter A. Kidder

              Title:                Vice President
                                    ------------------

                                    EXHIBIT A


     The Collateral  shall consist of all right,  title and interest of Borrower
in and to the following:

     (a) All goods and  equipment  now owned or hereafter  acquired,  including,
     without  limitation,  all machinery,  fixtures,  vehicles  (including motor
     vehicles and trailers),  and any interest in any of the foregoing,  and all
     attachments,   accessories,   accessions,   replacements,    substitutions,
     additions, and improvements to any of the foregoing, wherever located;

     (b) All  inventory,  now owned or hereafter  acquired,  including,  without
     limitation,  all merchandise,  raw materials,  parts, supplies, packing and
     shipping  materials,  work in process and finished products  including such
     inventory as is temporarily  out of Borrower's  custody or possession or in
     transit and  including  any returns  upon any  accounts or other  proceeds,
     including insurance proceeds, resulting from the sale or disposition of any
     of the foregoing and any documents of title  representing any of the above,
     and Borrower's Books relating to any of the foregoing;

     (c) All  contract  rights and general  intangibles  now owned or  hereafter
     acquired,  including,  without limitation,  goodwill,  trademarks,  service
     marks, trade styles, trade names,  patents,  patent  applications,  leases,
     license agreements,  franchise agreements,  blueprints,  drawings, purchase
     orders,  customer  lists,  route  lists,  infringements,  claims,  computer
     programs,  computer discs, computer tapes, literature,  reports,  catalogs,
     design  rights,  income tax refunds,  payments of  insurance  and rights to
     payment of any kind;

     (d) All now existing  and  hereafter  arising  accounts,  contract  rights,
     royalties,  license  rights  and all other  forms of  obligations  owing to
     Borrower  arising  out of the sale or  lease of  goods,  the  licensing  of
     technology or the rendering of services by Borrower,  whether or not earned
     by performance,  and any and all credit  insurance,  guaranties,  and other
     security therefor,  as well as all merchandise  returned to or reclaimed by
     Borrower and Borrower's Books relating to any of the foregoing;

     (e)  All  documents,   cash,  deposit  accounts,   securities  (other  than
     securities of foreign  Subsidiaries),  letters of credit,  certificates  of
     deposit,  instruments and chattel paper now owned or hereafter acquired and
     Borrower's Books relating to the foregoing;

     (f) All copyright rights,  copyright applications,  copyright registrations
     and  like  protections  in each  work of  authorship  and  derivative  work
     thereof, whether published or unpublished, now owned or hereafter acquired;
     all trade secret  rights,  including all rights to  unpatented  inventions,
     know-how, operating manuals, license rights and agreements and confidential
     information,  now owned or  hereafter  acquired;  all mask work or  similar
     rights  available for the protection of  semiconductor  chips, now owned or
     hereafter acquired;  all claims for damages by way of any past, present and
     future infringement of any of the foregoing; and

     (g) Any and all claims,  rights and  interests  in any of the above and all
     substitutions for, additions and accessions to and proceeds thereof.


                                    EXHIBIT B

                   LOAN PAYMENT/ADVANCE TELEPHONE REQUEST FORM

              DEADLINE FOR SAME DAY PROCESSING IS 3:00 P.M., P.S.T.


TO:  CENTRAL CLIENT SERVICE DIVISION              DATE:
                                                       -------------------------


FAX#:  (408) 432-3249                             TIME:
                                                       -------------------------



FROM:
Castelle
                                            CLIENT NAME (BORROWER)

REQUESTED
BY:
                                            AUTHORIZED SIGNER'S NAME

AUTHORIZED
SIGNATURE:

PHONE
NUMBER:

FROM ACCOUNT #                              TO ACCOUNT#
 

REQUESTED TRANSACTION TYPE                  REQUEST DOLLAR AMOUNT
PRINCIPAL INCREASE (ADVANCE)
PRINCIPAL PAYMENT (ONLY)
INTEREST PAYMENT (ONLY
PRINCIPAL AND INTEREST (PAYMENT)

OTHER INSTRUCTIONS:


     All representations and warranties of Borrower stated in the Loan Agreement
are true,  correct and complete in all  material  respects as of the date of the
telephone  request  for and Advance  confirmed  by this  Borrowing  Certificate;
provided, however, that those representations and warranties expressly referring
to another date shall be true,  correct and complete in all material respects as
of such date.




                                  BANK USE ONLY

TELEPHONE REQUEST:

The following  person is  authorized  to request the loan payment  transfer/loan
advance on the advance designated account and is known to me.

___________________________                         ______________________
 Authorized Requester                                    Phone #
___________________________                         ______________________
 Received By (Bank)                                      Phone #


___________________________
 Authorized Signature (Bank)



                                    EXHIBIT C
                           BORROWING BASE CERTIFICATE
                      (Borrowings in Excess of $1,000,000)

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

Borrower:  Castelle                                 Lender:  Silicon Valley Bank


Commitment Amount:            $6,000,000


ACCOUNTS RECEIVABLE
         1.       Accounts Receivable Book Value as of
         2.       Additions (please explain on reverse)
         3.       TOTAL ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE DEDUCTIONS (without duplication)
         4.       Amounts over 90 days due
         5.       Balance of 50% over 90 day accounts
         6.       Concentration Limits
         7.       Foreign Accounts
         8.       Governmental Accounts
         9.       Contra Accounts
         10.      Promotion or Demo Accounts
         11.      Intercompany/Employee Accounts
         12.      Other (please explain on reverse)
         13.      TOTAL ACCOUNTS RECEIVABLE DEDUCTIONS
         14.      Eligible Accounts (#3 minus #13)
         15.      LOAN VALUE OF ACCOUNTS (75% of #14)

BALANCES
         16.      Maximum Loan Amount                                 $6,000,000
         17.      Total Funds Available [Lesser of #15 or 16]
         18.      Present balance owing on Line of Credit
                  (including amount under Exim Sub-Facility)
         19.      RESERVE POSITION (#17 minus #18)

The undersigned represents and warrants that the foregoing is true, complete and
correct,  and that the information  reflected in this Borrowing Base Certificate
complies  with the  representations  and  warranties  set  forth in the Loan and
Security Agreement between the undersigned and Silicon Valley Bank.

COMMENTS:

                                                         BANK USE ONLY

________________________________________                 Rec'd By:

                                                         Auth. Signer
                                                         Date:


 By:____________________________________
    Authorized Signer                                    Verified:
                                                         Auth. Signer
                                                         Date:

 



                                    EXHIBIT D
                             COMPLIANCE CERTIFICATE


TO:               SILICON VALLEY BANK

FROM:             CASTELLE

     The undersigned  authorized  officer of Castelle  hereby  certifies that in
accordance  with the terms and  conditions  of the Amended and Restated Loan and
Security  Agreement  between  Borrower  and Bank dated as of June 20,  1996 (the
"Agreement"),  (i) Borrower is in complete compliance for the period ending with
all required  covenants except as noted below and (ii) all  representations  and
warranties  of  Borrower  stated in the  Agreement  are true and  correct in all
material  respects as of the date  hereof.  Attached  herewith  are the required
documents supporting the above certification. The Officer further certifies that
these are prepared in accordance with Generally Accepted  Accounting  Principles
(GAAP)  and are  consistently  applied  from one  period  to the next  except as
explained in an accompanying letter or footnotes.

     Please  indicate  compliance  status by circling  Yes/No  under  "Complies"
column.

  Reporting Covenant                 Required                      Complies

  Quarterly financial statements     Quarterly within 50 days      Yes     No
  Annual (CPA Audited)               FYE within 95 days            Yes     No
  A/R & A/P Agings                   Monthly within 20 days        Yes     No
  A/R Audit                          Annual                        Yes     No

  Financial Covenant                 Required     Actual           Complies

  Maintain on a Quarterly Basis:
    Minimum Quick Ratio              1.25:1.00     _____:1.00      Yes     No
    Minimum Tangible Net Worth       $7,000,000   $__________      Yes     No
    Maximum Debt/Tangible Net Worth  1.50:1.00     _____:1.00      Yes     No
    Debt Service Coverage            1.75:1.0      _____:1.00      Yes     No

                                  BANK USE ONLY

                                  Received by:_________________
                                              authorized signer

                                  Date:________________________

                                  Verified:____________________
                                           authorized signer

                                  Date:________________________

                                  Compliance Status: Yes     No


Comments Regarding Exceptions:  See Attached.


Sincerely,

____________________________________________
Signature

____________________________________________
Title

____________________________________________
Date


                     DISBURSEMENT REQUEST AND AUTHORIZATION


Borrower:  Castelle                                   Bank:  Silicon Valley Bank

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


LOAN TYPE.  This is a Variable  Rate,  Revolving  Line of Credit of a  principal
amount up to $6,000,000.

PRIMARY PURPOSE OF LOAN.  The primary purpose of this loan is for business.

SPECIFIC  PURPOSE.  The  specific  purpose of this loan is:  Short Term  Working
Capital.

DISBURSEMENT  INSTRUCTIONS.  Borrower  understands that no loan proceeds will be
disbursed  until  all of  Bank's  conditions  for  making  the  loan  have  been
satisfied. Please disburse the loan proceeds as follows:

                                                                 Revolving Line

         Amount paid to Borrower directly:
         Undisbursed Funds

         Principal                                                 $6,000,000

CHARGES  PAID IN  CASH.  Borrower  has paid or will  pay in cash as  agreed  the
following charges:

         Prepaid  Finance Charges Paid in Cash:
                  $ N/A     Loan Fee
                  $         Accounts Receivables Audit

         Other Charges Paid in Cash:
                  $         UCC Search Fees
                  $         UCC Filing Fees
                  $         Patent Filing Fees
                  $         Trademark Filing Fees
                  $         Copyright Filing Fees
                  $ 1800    Outside Counsel Fees and Expenses

         Total Charges Paid in Cash

AUTOMATIC PAYMENTS. Borrower hereby authorizes Bank automatically to deduct from
Borrower's account numbered the amount of any loan payment.  If the funds in the
account are  insufficient  to cover any payment,  Bank shall not be obligated to
advance funds to cover the payment. At any time and for any reason,  Borrower or
Bank may voluntarily terminate Automatic Payments.

FINANCIAL  CONDITION.  BY SIGNING THIS  AUTHORIZATION,  BORROWER  REPRESENTS AND
WARRANTS  TO BANK THAT THE  INFORMATION  PROVIDED  ABOVE IS TRUE AND CORRECT AND
THAT THERE HAS BEEN NO MATERIAL ADVERSE CHANGE IN BORROWER'S FINANCIAL CONDITION
AS  DISCLOSED  IN  BORROWER'S  MOST RECENT  FINANCIAL  STATEMENT  TO BANK.  THIS
AUTHORIZATION IS DATED AS OF JUNE 20, 1996.

BORROWER:

CASTELLE

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

Authorized Officer




                         AGREEMENT TO PROVIDE INSURANCE


Grantor:          Castelle                      Bank:        Silicon Valley Bank

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


     INSURANCE   REQUIREMENTS.   Castelle,  Inc.  ("Grantor")  understands  that
insurance coverage is required in connection with the extending of a loan or the
providing  of  other  financial   accommodations   to  Grantor  by  Bank.  These
requirements  are  set  forth  in the  Loan  Documents.  The  following  minimum
insurance coverages must be provided on the following described  collateral (the
"Collateral"):

     Collateral:            All Inventory, Equipment and Fixtures.
     Type:                  All risks, including fire, theft and liability.
     Amount:                Full insurable value.
     Basis:                 Replacement value.
     Endorsements:          Loss  payable  clause  to Bank with
                            stipulation  that coverage will not
                            be cancelled or diminished  without
                            a  minimum  of  twenty  (20)  days'
                            prior written notice to Bank.

     INSURANCE COMPANY.  Grantor may obtain insurance from any insurance company
Grantor may choose that is reasonably  acceptable to Bank.  Grantor  understands
that credit may not be denied solely because insurance was not purchased through
Bank.

     FAILURE  TO PROVIDE  INSURANCE.  Grantor  agrees to deliver to Bank,  on or
before closing,  evidence of the required  insurance as provided above,  with an
effective  date of June 20, 1996, or earlier.  Grantor  acknowledges  and agrees
that if Grantor  fails to provide any  required  insurance  or fails to continue
such insurance in force,  Bank may do so at Grantor's expense as provided in the
Loan and Security Agreement.  The cost of such insurance, at the option of Bank,
shall be payable on demand or shall be added to the  indebtedness as provided in
the security document.  GRANTOR  ACKNOWLEDGES THAT IF BANK SO PURCHASES ANY SUCH
INSURANCE, THE INSURANCE WILL PROVIDE LIMITED PROTECTION AGAINST PHYSICAL DAMAGE
TO THE COLLATERAL,  UP TO THE BALANCE OF THE LOAN; HOWEVER,  GRANTOR'S EQUITY IN
THE  COLLATERAL MAY NOT BE INSURED.  IN ADDITION,  THE INSURANCE MAY NOT PROVIDE
ANY PUBLIC  LIABILITY OR PROPERTY  DAMAGE  INDEMNIFICATION  AND MAY NOT MEET THE
REQUIREMENTS OF ANY FINANCIAL RESPONSIBILITY LAWS.

     AUTHORIZATION.  For  purposes  of  insurance  coverage  on the  Collateral,
Grantor  authorizes Bank to provide to any person (including any insurance agent
or company)  all  information  Bank deems  appropriate,  whether  regarding  the
Collateral, the loan or other financial accommodations, or both.

     GRANTOR  ACKNOWLEDGES  HAVING READ ALL THE  PROVISIONS OF THIS AGREEMENT TO
PROVIDE  INSURANCE  AND AGREES TO ITS TERMS.  THIS  AGREEMENT  IS DATED JUNE 20,
1996.

GRANTOR:

CASTELLE


/s/ Randall I. Bambrough
    Randall I. Bambrough
    --------------------

    Authorized Officer

================================================================================
                             INSURANCE VERIFICATION

 DATE:
                        ------------------------

 PHONE:
                        ------------------------

AGENT'S NAME:
                        ------------------------
INSURANCE COMPANY:
                        ------------------------
POLICY NUMBER:
                        ------------------------
EFFECTIVE DATES:
                        ------------------------
COMMENTS:
                        ------------------------
================================================================================



 



                         CORPORATE RESOLUTIONS TO BORROW


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

Borrower:                 Castelle

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

     I, the  undersigned  Secretary  or  Assistant  Secretary  of Castelle  (the
"Corporation"),  HEREBY  CERTIFY that the  Corporation is organized and existing
under and by virtue of the laws of the State of California.

     I FURTHER CERTIFY that the Articles of Incorporation  and Bylaws previously
delivered  to Bank remain in full force and effect and have not been  amended or
restated.

     I FURTHER CERTIFY that at a meeting of the Directors of the Corporation (or
by other duly authorized corporate action in lieu of a meeting), duly called and
held, at which a quorum was present and voting,  the following  resolutions were
adopted.

     BE IT  RESOLVED,  that  any  one  (1)  of  the  following  named  officers,
employees,  or agents of this  Corporation,  whose actual  signatures  are shown
below:

         NAME                   POSITION                  ACTUAL SIGNATURE


Randall I. Bambrough     Vice President of Finance    /s/ Randall I. Bambrough
- --------------------     -------------------------    ------------------------


acting for an on behalf of this Corporation and as its act and deed be, and they
hereby are, authorized and empowered:

     Borrow  Money.  To  borrow  from  time to time  from  Silicon  Valley  Bank
("Bank"),  on such terms as may be agreed upon between the officers,  employees,
or agents  and Bank,  such sum or sums of money as in their  judgment  should be
borrowed,  without  limitation,  including  such sums as are  specified  in that
certain  Loan  and  Security  Agreement  dated as of June 20,  1996  (the  "Loan
Agreement").

     Execute Notes.  To execute and deliver to Bank the promissory note or notes
of the  Corporation,  on Lender's  forms,  at such rates of interest and on such
terms as may be agreed  upon,  evidencing  the sums of money so  borrowed or any
indebtedness  of the  Corporation  to Bank,  and also to execute  and deliver to
Lender  one  or  more   renewals,   extensions,   modifications,   refinancings,
consolidations, or substitutions for one or more of the notes, or any portion of
the notes.

     Grant  Security.  To grant a security  interest  to Bank in the  Collateral
described in the Loan Agreement, which security interest shall secure all of the
Corporation's Obligations, as described in the Loan Agreement.

     Negotiate Items. To draw, endorse, and discount with Bank all drafts, trade
acceptances,  promissory notes, or other evidences of indebtedness payable to or
belonging to the  Corporation or in which the  Corporation may have an interest,
and either to receive cash for the same or to cause such proceeds to be credited
to the account of the Corporation with Bank, or to cause such other  disposition
of the proceeds derived therefrom as they may deem advisable.



 


     Issue  Warrant.  To  issue a  warrant  to  purchase  capital  stock  of the
Corporation.

     Further  Acts. In the case of lines of credit,  to designate  additional or
alternate individuals as being authorized to request advances thereunder, and in
all cases, to do and perform such other acts and things, to pay any and all fees
and costs,  and to execute and deliver such other  documents  and  agreements as
they may in their  discretion  deem  reasonably  necessary or proper in order to
carry into effect the provisions of these Resolutions.

     BE IT FURTHER RESOLVED,  that any and all acts authorized pursuant to these
resolutions and performed  prior to the passage of these  resolutions are hereby
ratified and  approved,  that these  Resolutions  shall remain in full force and
effect  and Bank may rely on these  Resolutions  until  written  notice of their
revocation  shall have been  delivered to and received by Bank.  Any such notice
shall not affect any of the Corporation's agreements or commitments in effect at
the time notice is given.

     I FURTHER CERTIFY that the officers,  employees, and agents named above are
duly elected,  appointed, or employed by or for the Corporation, as the case may
be, and occupy the positions set forth opposite their respective names; that the
foregoing  Resolutions now stand of record on the books of the Corporation;  and
that the  Resolutions are in full force and effect and have not been modified or
revoked in any manner whatsoever.

     IN WITNESS WHEREOF, I have hereunto set my hand on June 20, 1996 and attest
that the  signatures  set  opposite  the names  listed  above are their  genuine
signatures.


                                        CERTIFIED TO AND ATTESTED BY:


                                        /s/ Randall I. Bambrough

                                        Randall I. Bambrough
                                        ------------------------ 











                                    CASTELLE

                               EXPORT-IMPORT BANK


                AMENDED AND RESTATED LOAN AND SECURITY AGREEMENT




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







     This AMENDED AND RESTATED  EXPORT-IMPORT  BANK LOAN AND SECURITY  AGREEMENT
(the "Exim  Agreement")  is entered  into as of June 20,  1996,  by and  between
SILICON VALLEY BANK ("Bank") and CASTELLE, INC. ("Borrower").


                                    RECITALS

     A. Bank and Borrower are parties to that certain  Amended and Restated Loan
and Security  Agreement dated February 9, 1994, as amended by those certain Loan
Modification  Agreements dated as of March 31, 1995, August 31, 1995,  September
20,  1995,  February  8, 1996 and March 31, 1996 and as may have been and may be
further amended (the "Original Agreement").

     B. Borrower and Bank are entering into concurrently herewith an Amended and
Restated  Loan and  Security  Agreement  of even  date  herewith  with Bank (the
"Domestic Agreement"), together with related documents.

     C.  Borrower  and Bank  desire in this Exim  Agreement  to set forth  their
agreement  with respect to a working  capital  sub-facility  to be guaranteed by
Export-Import Bank of the United States and to amend and restate in its entirety
without  novation  the  Original  Agreement in  accordance  with the  provisions
herein.


                                    AGREEMENT

     The parties agree as follows:

     1. DEFINITIONS AND CONSTRUCTION

     1.1 Definitions. Except as otherwise defined, terms that are capitalized in
this Exim  Agreement  shall  have the  meaning  assigned  in the  Domestic  Loan
Documents.  As used in this Exim  Agreement,  the following terms shall have the
following definitions:

     "Borrower  Agreement"  means the  Export-Import  Bank of the United  States
Working Capital Guarantee Program Borrower Agreement between Borrower and Bank.

     "Borrowing Base" has the meaning set forth in Section 2.1 hereof.

     "Domestic Agreement" has the meaning set forth in recital paragraph B.

     "Domestic Loan Documents" means the Domestic  Agreement and the instruments
and documents executed in connection with that Agreement.

     "Eligible Foreign  Inventory" means Inventory  purchased or manufactured by
Borrower for resale located in the United  States,  other than Inventory that is
excluded under the Borrower Agreement and this Exim Agreement.  Eligible Foreign
Inventory shall not include the following:

     (a) any Inventory which is not located in the United States;

     (b) any demonstration Inventory or Inventory sold on consignment;

     (c) any Inventory consisting of proprietary software;

     (d) any Inventory which is damaged, obsolete, returned, defective, recalled
     or unfit for further processing;

     (e) any  Inventory  which  has been  previously  exported  from the  United
     States;

     (f) any Inventory which constitutes defense articles or defense services;

     (g) any  Inventory  which is to be  incorporated  into items  destined  for
     shipment to a country in which Exim Bank is legally  prohibited  from doing
     business;

     (h) any  Inventory  which is to be  incorporated  into items  destined  for
     shipment  to a country in which Exim Bank  coverage  is not  available  for
     commercial  reasons,  except  to the  extent  such  items  are sold to such
     country on terms of a letter of credit  confirmed by a bank  acceptable  to
     Exim Bank; and

     (i) any Inventory which is to be  incorporated  into items whose sale would
     result in an ineligible Account Receivable.

     "Exim Bank" means Export-Import Bank of the United States.

     "Exim Bank Expenses"  means all:  reasonable  costs or expenses  (including
reasonable  attorneys'  fees  and  expenses)  incurred  in  connection  with the
preparation, negotiation, administration, and enforcement of the Loan Documents,
including any costs incurred in relation to opposing or seeking to obtain relief
from any stay or restructuring order prohibiting Bank from exercising its rights
as a secured  creditor,  foreclosing  upon or disposing of  Collateral,  or such
related  matters;  fees  that Bank  pays to Exim  Bank in  consideration  of the
issuance  of the Exim  Guarantee;  and  Bank's  reasonable  attorneys'  fees and
expenses  incurred in  amending,  enforcing  or  defending  the Loan  Documents,
whether or not suit is brought.

     "Exim Committed Line" means Three Million Dollars ($3,000,000).

     "Exim Eligible  Foreign  Accounts"  means those Accounts  payable in United
States  Dollars that arise in the ordinary  course of  Borrower's  business from
Borrower's  sale of Eligible  Foreign  Inventory  (i) with  respect to which the
account debtor is not a resident of the United  States;  and (ii) that have been
validly  assigned  and  comply  with  all  of  Borrower's   representations  and
warranties to Bank; and (iii) that are supported by the Exim  Insurance  Policy;
provided,  that standards of  eligibility  may be fixed and revised from time to
time by Bank in Bank's reasonable judgment and upon notification  thereof to the
Borrower  in  accordance  with the  provisions  hereof.  Exim  Eligible  Foreign
Accounts shall not include the following:

     (a) Accounts with a term in excess of ninety (90) days;

     (b)  Accounts  that the account  debtor has failed to pay within sixty (60)
     calendar days of the original due date of the invoice  unless such Accounts
     are insured  through Exim Bank export credit  insurance  for  comprehensive
     commercial  and  political  risk,  or through  Exim Bank  approved  private
     insurers for comparable  coverage,  in which case ninety (90) calendar days
     shall apply;

     (c) Accounts  with respect to an account  debtor,  fifty  percent  (50%) of
     whose Accounts the account debtor has failed to pay within ninety (90) days
     of the original date of invoice;

     (d) Accounts  evidenced by a letter of credit until the date of shipment of
     the items covered by the subject letter of credit;

     (e) Accounts  with  respect to which the account  debtor is an Affiliate of
     Borrower;

     (f)  Accounts  with  respect  to which the  account  debtor is located in a
     country in which Exim Bank is legally prohibited from doing business;

     (g)  Accounts  with  respect  to which the  account  debtor is located in a
     country  in which  Exim  Bank  coverage  is not  available  for  commercial
     reasons;

     (h) Accounts with respect to which Borrower is liable to the account debtor
     for goods sold or services rendered by the account debtor to Borrower,  but
     only to the extent of Borrower's liability to such account debtor;

     (i) Accounts with respect to which the account debtor disputes liability or
     makes any claim with respect  thereto (but only to the extent of the amount
     subject  to  such  dispute  or  claim),  or is  subject  to any  Insolvency
     Proceeding, or becomes insolvent, or goes out of business;

     (j) Accounts with respect to an account debtor,  including Subsidiaries and
     Affiliates,  whose total obligations to Borrower exceed twenty-five percent
     (25%)  of  all  Accounts,  to  the  extent  such  obligations  exceed  such
     percentage, except as approved in writing by Bank;

     (k)  Accounts  generated  by the sale of products  purchased  for  military
     purposes;

     (l)  Accounts  generated by sales of Inventory  which  constitutes  defense
     articles or defense services;

     (m) Accounts payable in currency other than Dollars;

     (n) Accounts  which are due and owing and the  collection  of which must be
     made outside the United States;

     (o) Accounts the  collection  of which Bank or Exim Bank  determines in its
     reasonable judgment to be doubtful; and

     (p) Accounts that are excluded  from the Borrowing  Base under the Borrower
     Agreement.

     "Exim  Guarantee"  means that certain Master  Guarantee  Agreement or other
agreement,  as amended from time to time, the terms of which are incorporated by
reference  into this Exim  Agreement,  pursuant  to which  Exim Bank  guarantees
Borrower's obligations under this Exim Agreement.

     "Exim Insurance Policy" means that certain Short Term Comprehensive  Multi-
Buyer Export Credit Insurance Policy No. naming Borrower the "insured".

     "Exim  Loan  Documents"  means,  collectively,  this  Exim  Agreement,  the
Domestic Loan Documents,  any note or notes executed by Borrower,  and any other
agreement  entered into between  Borrower and Bank in connection  with this Exim
Agreement, all as amended or extended from time to time.

     "Exim  Maturity  Date" means the earlier of (i) the Maturity Date under the
Domestic  Loan  Documents  or (ii)  the date  immediately  preceding  the  first
anniversary of the date hereof.

     "Original Agreement" has the meaning set forth in recital paragraph A.

     2. LOAN AND TERMS OF PAYMENT

     2.1 Revolving  Advances.  Subject to the terms and  conditions of this Exim
Agreement,  Bank agrees to make  Advances to Borrower in an amount not to exceed
the lesser of the Exim  Committed  Line or the Borrowing  Base.  For purposes of
this Exim  Agreement  "Borrowing  Base" shall mean an amount equal to (i) ninety
percent (90%) of the Exim Eligible Foreign Accounts and (ii) forty percent (40%)
of Eligible Foreign Inventory.

     To evidence the Advances, Borrower shall execute and deliver to Bank on the
date hereof a promissory  note (the "Note") in  substantially  the form attached
hereto as Exhibit B.

     Whenever  Borrower  desires  an  Advance,  Borrower  will  notify  Bank  by
facsimile  transmission or telephone no later than 3:00 p.m. California time, on
the Business Day that the Advance is to be made. Each such notification shall be
promptly  confirmed  by a  Payment/Advance  Form in  substantially  the  form of
Exhibit  C hereto.  In  addition  to the  procedure  set forth in the  preceding
sentence,  Bank is authorized to make Advances under this Exim Agreement,  based
upon  written  instructions  received  from a  Responsible  Officer  or  without
instructions  if in  Bank's  discretion  such  Advances  are  necessary  to meet
Obligations which have become due and remain unpaid. Bank will credit the amount
of Advances made under this Section 2.1 to Borrower's  deposit account.  Amounts
borrowed  pursuant to this Section 2.1 may be repaid and re-borrowed at any time
during  the term of this  Exim  Agreement  so long as no Event  of  Default  has
occurred and is continuing.

     2.2  Overadvances.  If,  at any  time  or for any  reason,  the  amount  of
Obligations pursuant to this Exim Agreement owed by Borrower to Bank pursuant to
Section  2.1 of this  Exim  Agreement  is  greater  than the  lesser  of (i) the
Borrowing  Base or (ii) the Exim  Committed  Line,  at the  option of Bank,  (i)
Borrower shall  immediately pay to Bank, in cash, the amount of such excess,  or
(ii)  Borrower  shall furnish  additional  collateral to Bank in form and amount
satisfactory to Bank and Exim Bank.

     2.3 Interest Rates, Payments, and Calculations.

     (a)  Interest  Rate.  Except  as  specified  to the  contrary  in any  Loan
     Document, the Obligations under this Exim Agreement shall bear interest, on
     the average Daily Balance, at a rate equal to the Prime Rate.

     (b) Default Rate. All Obligations  shall bear interest,  from and after the
     occurrence of an Event of Default,  at a rate equal to five (5)  percentage
     points above the rate that applied  immediately  prior to the occurrence of
     the Event of Default.

     (c) Payments. Interest hereunder shall be due and payable on the nineteenth
     Business Day of each calendar month during the term hereof.  Bank shall, at
     its option, charge such interest,  all Exim Bank Expenses, and all Periodic
     Payments against  Borrower's  deposit account or against the Exim Committed
     Line, in which case those amounts shall  thereafter  accrue interest at the
     rate then  applicable  hereunder.  Any  interest not paid when due shall be
     compounded by becoming a part of the  Obligations,  and such interest shall
     thereafter accrue interest at the rate then applicable hereunder.

     (d)  Computation.  In the event the Prime Rate is changed from time to time
     hereafter,  the applicable rate of interest hereunder shall be increased or
     decreased  contemporaneously  with such  change by an amount  equal to such
     change in the  Prime  Rate.  All  interest  chargeable  under the Exim Loan
     Documents shall be computed on the basis of a three hundred sixty (360) day
     year for the actual number of days elapsed.

     2.4 Crediting Payments.  The receipt by Bank of any wire transfer of funds,
check,  or other item of payment shall be immediately  applied to  conditionally
reduce Obligations, but shall not be considered a payment on account unless such
wire  transfer  is of  immediately  available  federal  funds and is made to the
appropriate deposit account of Bank or unless and until such check or other item
of payment is honored when  presented for payment.  Notwithstanding  anything to
the  contrary  contained  herein,  any payment  (other  than a wire  transfer of
immediately  available  funds) received by Bank after 12:00 noon California time
shall be deemed to have been  received  by Bank as of the opening of business on
the immediately following Business Day.

     2.5 Fees. Borrower shall pay to Bank the following fees:

     (a) Financial  Examination and Appraisal Fees.  Bank's  reasonable fees and
     reasonable  out-of-pocket  expenses for Bank's  initial audit of Borrower's
     Accounts and Inventory, and for each subsequent appraisal of Collateral and
     financial  analysis and examination of Borrower performed from time to time
     by Bank or its agents;

     (b) Exim Fee. A facility  fee equal to One and One Half Percent (1 1/2%) of
     the Exim  Committed  Line,  which fee shall be due and  fully  earned  upon
     Bank's receipt of the Exim Guarantee;

     (c) Exim Bank Expenses.  On the Closing Date,  Exim Bank Expenses  incurred
     through  the  Closing  Date and,  after  the  Closing  Date,  all Exim Bank
     Expenses as they become due.

     2.6  Increased  Costs.  In case any law,  regulation,  treaty  or  official
directive  or the  interpretation  or  application  thereof  by any court or any
governmental authority charged with the administration thereof or the compliance
with  any  guideline  or  request  of any  central  bank or  other  governmental
authority (whether or not having the force of law):

     (a)  subjects  Bank to any tax with  respect to  payments of  principal  or
     interest or any other  amounts  payable  hereunder by Borrower or otherwise
     with respect to the transactions  contemplated  hereby (except for taxes on
     the overall net income of Bank  imposed by the United  States of America or
     any political subdivision thereof); or

     (b) imposes,  modifies or deems applicable any deposit insurance,  reserve,
     special deposit or similar  requirement against assets held by, or deposits
     in or for the account of, or loans by, Bank; or

     (c) imposes upon Bank any other condition with respect to their performance
     under this Exim Agreement,

and the result of any of the  foregoing is to increase the cost to Bank,  reduce
the income  receivable  by Bank or impose any expense  upon Bank with respect to
any loans,  Bank shall notify Borrower  thereof.  Borrower agrees to pay to Bank
the amount of such increase in cost,  reduction in income or additional  expense
as and when such cost,  reduction  or expense is  incurred or  determined,  upon
presentation  all in reasonable  detail by Bank of a statement in the amount and
setting forth Bank's calculation  thereof,  which statement shall be deemed true
and correct absent  manifest error; provided,  however, that the Borrower  shall
not be liable for any such amount  attributable to any period prior to 180  day
 prior to the date of such certificate.

     2.7 Term.  Subject  to  Section  13.6,  this Exim  Agreement  shall  become
effective  once duly  executed  and  authorized  by Borrower  and Bank and shall
continue in full force and effect for a term ending on the Exim  Maturity  Date,
on  which  date  all  Obligations  shall  become  immediately  due and  payable.
Notwithstanding the foregoing,  Bank shall have the right to terminate this Exim
Agreement  immediately  and without  notice upon the  occurrence  of an Event of
Default  and  Borrower  shall have the right to  terminate  this Exim  Agreement
immediately upon payment in full of its Obligations then outstanding  hereunder.
Notwithstanding  any termination of this Exim Agreement,  all of Bank's security
interest in all of the  Collateral  and all of the terms and  provisions of this
Exim  Agreement  shall  continue in full force and effect until all  Obligations
(excluding  Obligations  under  Sections  2.6 and 10.3 to the extent they remain
inchoate at the time outstanding payment Obligations are paid in full) have been
paid and performed in full, and no termination  shall impair any right or remedy
of Bank, nor shall any such  termination  relieve  Borrower of any Obligation to
Bank until all of the Obligations have been paid and performed in full.

     2.8 Use of Proceeds.  Borrower  will use the proceeds of Advances  only for
the purposes  specified in the Borrower  Agreement.  Borrower  shall not use the
proceeds of the Advances for any purpose prohibited by the Borrower Agreement.

     3. CONDITIONS OF LOANS

     3.1 Conditions Precedent to Initial Advance. The obligation of Bank to make
the initial  Advance is subject to the condition  precedent that Bank shall have
received, in form and substance satisfactory to Bank, the following:

     (a) this Exim  Agreement,  the Borrower  Agreement and the Note,  each duly
     executed by Borrower;

     (b) a  certificate  of the secretary of Borrower with respect to incumbency
     and  resolutions  authorizing  the  execution  and  delivery  of this  Exim
     Agreement;

     (c) the Exim Guarantee;

     (d) payment of the fees and Exim Bank  Expenses  then due and  specified in
     Section 2.5 hereof;

     (e)  documents  and  agreements as specified in Section 3.1 of the Domestic
     Agreement; and

     (f) such other documents, and completion of such other matters, as Bank may
     deem reasonably necessary or appropriate.

     3.2  Conditions  Precedent to all Advances.  The obligation of Bank to make
each Advance, including the initial Advance, is further subject to the following
conditions:

     (a)  timely  receipt by Bank of the  Payment/Advance  Form as  provided  in
     Section 2.1;

     (b) timely  receipt by Bank of a copy of the executed  firm written  export
     purchase  order  relating to the  requested  Advance,  the payment terms of
     which shall be acceptable to Bank;

     (c)  timely  receipt  by  Bank  of  an  Export  Order  and  Borrowing  Base
     Certificate as defined in the Borrower Agreement;

     (d) the Exim Guarantee shall be in full force and effect; and

     (e) the representations and warranties  contained in Section 5 hereof shall
     be true and accurate in all material respects on and as of the date of such
     Payment/Advance  Form and on the  effective  date of each Advance as though
     made  at and as of  each  such  date  (except  to the  extent  they  relate
     specifically  to an earlier  date, in which case such  representations  and
     warranties  shall continue to have been true and accurate as of such date),
     and no Potential  Event of Default or Event of Default  shall have occurred
     and be continuing, or would result from such Advance.

     The  making of each  Advance  shall be deemed  to be a  representation  and
warranty by Borrower on the date of such Advance as to the accuracy of the facts
referred to in subsection (e) of this Section 3.2.

     4. CREATION OF SECURITY INTEREST

     4.1 Grant of Security Interest. Borrower hereby grants to Bank a continuing
security  interest in all presently  existing and hereafter  acquired or arising
Collateral in order to secure prompt repayment of any and all Obligations and in
order to secure  prompt  performance  by Borrower of each of its  covenants  and
duties under the Exim Loan Documents.

     4.2 Delivery of Additional Documentation Required. Borrower shall from time
to time  execute and  deliver to Bank,  at the  request of Bank,  all  financing
statements  and  other  documents  that  Bank may  reasonably  request,  in form
satisfactory  to  Bank,  to  perfect  and  continue  perfected  Bank's  security
interests  in the  Collateral  and  in  order  to  fully  consummate  all of the
transactions contemplated under the Exim Loan Documents.

     4.3 Power of Attorney.  Effective  only upon the  occurrence and during the
continuance of an Event of Default,  Borrower hereby  irrevocably  appoints Bank
(and any of Bank's  designated  officers,  or employees) as Borrower's  true and
lawful attorney,  with power to: (a) send requests for verification of Accounts;
(b) endorse  Borrower's name on any checks or other forms of payment or security
that may come into  Bank's  possession;  (c) sign the name of Borrower on any of
the  documents  described  in  Section  4.2  (regardless  of whether an Event of
Default has occurred); (d) sign Borrower's name on any invoice or bill of lading
relating  to  any  Account,  drafts  against  account  debtors,   schedules  and
assignments  of  Accounts,  verifications  of  Accounts,  and notices to account
debtors;  (e) make,  settle,  and  adjust all claims  under and  decisions  with
respect to Borrower's policies of insurance;  and (f) settle and adjust disputes
and claims  respecting the accounts  directly with account debtors,  for amounts
and upon terms which Bank  determines to be reasonable.  The appointment of Bank
as  Borrower's  attorney-in-fact,  and each of Bank's  rights and powers,  being
coupled with an interest,  is irrevocable until all of the Obligations have been
fully repaid and Bank's obligation to provide Advances hereunder is terminated.

     4.4  Right to  Inspect.  Each of Bank and Exim Bank  (through  any of their
respective officers, employees, or agents) shall have the right, upon reasonable
prior notice,  from time to time during  Borrower's  usual  business  hours,  to
inspect  Borrower's Books,  facilities and activities,  and to check,  test, and
appraise the Collateral in order to verify Borrower's financial condition or the
amount,  condition  of, or any other matter  relating to, the  Collateral.  Bank
shall conduct semi-annual accounts receivable audits and physical inspections of
the  Inventory,  the  results of which  audits  shall be  satisfactory  to Bank.
Borrower  will cause its officers and  employees to give their full  cooperation
and assistance in connection therewith.

     5. REPRESENTATIONS AND WARRANTIES

     Borrower represents, warrants and covenants as follows:

     5.1 Domestic Loan Documents.  The representations and warranties  contained
in the Domestic Loan Documents are true and correct.

     6. AFFIRMATIVE COVENANTS

     Borrower   covenants  and  agrees  that,  until  payment  in  full  of  the
Obligations, Borrower shall do all of the following:

     6.1 Domestic Loan Documents. Borrower shall comply in all respects with the
provisions of the Domestic Loan Documents.

     6.2 Terms of Sale.  Borrower  shall cause all sales of products  upon which
Advances are based either to be (i) supported by one or more irrevocable letters
of credit in an amount  and of a tenor,  naming a  beneficiary  and  issued by a
financial institution acceptable to Bank or (ii) on open account to creditworthy
buyers that have been preapproved in writing by Bank and Exim Bank.

     6.3 Borrower Agreement.  Borrower shall comply with all of the terms of the
Borrower  Agreement.  In the event of any conflict or inconsistency  between any
provision  contained in the Borrower  Agreement with any provision  contained in
this Exim Agreement, the more strict provision,  with respect to Borrower, shall
control.

     6.4 Notice in Event of Filing of Action for Debtor's Relief. Borrower shall
notify  Bank in writing  within  five (5) days of the  occurrence  of any of the
following:  (1) Borrower  begins or consents in any manner to any  proceeding or
arrangement for its  liquidation in whole or in part or to any other  proceeding
or arrangement whereby any of its assets are subject generally to the payment of
its  liabilities  or whereby any  receiver,  trustee,  liquidator or the like is
appointed  for it or any  substantial  part  of its  assets  (including  without
limitation  the  filing  by  Borrower  of  a  petition  for   appointment  as  a
debtor-in-possession  under Title 11 of the U.S.  Code);  (2) Borrower  fails to
obtain the  dismissal or stay on appeal  within thirty (30) calendar days of the
commencement  of  any  proceeding  arrangement  referred  to in (1)  above;  (3)
Borrower begins any other procedure for the relief of financially  distressed or
insolvent  debtors,  or such  procedure has been  commenced  against it, whether
voluntarily  or  involuntarily,  and such  procedure  has not  been  effectively
terminated,  dismissed  or stayed  within  thirty (30)  calendar  days after the
commencement  thereof, or (4) Borrower begins any procedure for its dissolution,
or a procedure therefor has been commenced against it.

     6.5 Payment in Dollars.  Borrower  shall  require  payment in United States
Dollars for the products, unless Exim Bank otherwise agrees in writing.

     6.6 Further  Assurances.  At any time and from time to time Borrower  shall
execute and deliver such further instruments and take such further action as may
reasonably be requested by Bank to effect the purposes of this Exim Agreement.

     7. NEGATIVE COVENANTS

     Borrower  covenants and agrees that,  without the prior written  consent of
the Bank,  which Bank may grant or withhold in its sole  discretion,  so long as
any  credit  hereunder  shall be  available  and  until  payment  in full of the
Obligations,  Borrower  will  not do any of the  following,  or  enter  into any
agreement to do any of the following:

     7.1 Domestic Loan  Documents.  Violate or otherwise fail to comply with any
provision of the Domestic Loan Documents.

     7.2 Loans to Shareholders or Affiliates.  Without Exim Bank's prior written
consent,  make any loans to any shareholder or entity  affiliated with Borrower.
As used in this Section 7.2, the term "loan" does not include salary,  rent paid
to an affiliated entity owned by the shareholders, or to other expenses incurred
in the ordinary course of Borrower's business.

     7.3  Borrower  Agreement.  Violate  or  otherwise  fail to comply  with any
provision of the Borrower Agreement.

     7.4 Exim Guarantee. Take any action, or permit any action to be taken, that
causes or, with the passage of time,  could reasonably be expected to cause, the
Exim Guarantee to cease to be in full force and effect.

     8. EVENTS OF DEFAULT

     Any one or more of the  following  events  shall  constitute  an  Event  of
Default by Borrower under this Exim Agreement:

     8.1 Payment  Default.  If Borrower  fails to pay the  principal  of, or any
interest on, any Advances  when due and payable;  or fails to pay any portion of
any other  Obligations not  constituting  such principal or interest,  including
without limitation Exim Bank Expenses (or any interest but for the provisions of
the United States  Bankruptcy Code, would have occurred on any accounts), within
thirty (30) days of receipt by Borrower of an invoice therefor;

     8.2  Covenant  Default;  Cross  Default.  If Borrower  fails or neglects to
perform, keep, or observe any material term, provision,  condition, covenant, or
agreement  contained  in  this  Exim  Agreement,  in any of  the  Domestic  Loan
Documents,  the Borrower  Agreement or the Exim Loan  Documents,  or an Event of
Default  occurs  under  any of  the  Domestic  Loan  Documents  or the  Borrower
Agreement; or

     8.3 Exim  Guarantee.  If the Exim Guarantee  ceases for any reason to be in
full force and effect,  or if the Exim Bank declares the Exim  Guarantee void or
revokes or purports to revoke any obligations under the Exim Guarantee.

     9. BANK'S RIGHTS AND REMEDIES

     9.1 Rights and Remedies.  Upon the occurrence of an Event of Default,  Bank
may, at is election,  without notice and without  demand,  do any one or more of
the following:

     (a) Declare all Obligations,  whether evidenced by this Exim Agreement,  by
     any of the other Exim Loan  Documents,  or otherwise,  immediately  due and
     payable;

     (b) Cease  advancing  money or  extending  credit to or for the  benefit of
     Borrower  under this Exim  Agreement or under any other  agreement  between
     Borrower and Bank;

     (c) Settle or adjust  disputes and claims directly with account debtors for
     amounts,  upon terms and in whatever order that Bank  reasonably  considers
     advisable;

     (d) Notify  customers of Borrower or other third parties to pay any amounts
     owing to Borrower directly to Bank;

     (e) Without  notice to or demand upon  Borrower,  make such payments and do
     such acts as Bank considers necessary or reasonable to protect its security
     interest in the  Collateral.  Borrower agrees to assemble the Collateral if
     Bank so requires,  and to make the Collateral available to Bank as Bank may
     designate.  Borrower  authorizes  Bank to  enter  the  premises  where  the
     Collateral is located,  to take and maintain  possession of the Collateral,
     or any  part of it,  and to  pay,  purchase,  contest,  or  compromise  any
     encumbrance,  charge, or lien which in Bank's  determination  appears to be
     prior or superior to its security interest and to pay all expenses incurred
     in connection therewith.  With respect to any of Borrower's owned premises,
     Borrower  hereby  grants  Bank a license to enter into  possession  of such
     premises  and to occupy the same,  without  charge,  for up to one  hundred
     twenty  (120) days in order to  exercise  any of Bank's  rights or remedies
     provided herein, at law, in equity, or otherwise;

     (f) Set off and  apply  to the  Obligations  any and all (i)  balances  and
     deposits of Borrower held by Bank, or (ii)  indebtedness  at any time owing
     to or for the credit or the account of Borrower held by Bank;

     (g) Ship, reclaim,  recover, store, finish,  maintain,  repair, prepare for
     sale,  advertise for sale, and sell (in the manner provided for herein) the
     Collateral.  Bank is  hereby  granted  a  license  or other  right,  solely
     pursuant to the  provisions  of this section 9.1, to use,  without  charge,
     Borrower's labels,  patents,  copyrights,  rights of use of any name, trade
     secrets, trade names, trademarks, service marks, and advertising matter, or
     any  property of a similar  nature,  as it pertains to the  Collateral,  in
     completing  production of, advertising for sale, and selling any Collateral
     and, in  connection  with Bank's  exercise of its rights under this section
     9.1,  Borrower's  rights under all licenses  and all  franchise  agreements
     shall inure to Bank's benefit;

     (h) Sell the Collateral at either a public or private sale, or both, by way
     of one or more  contracts or  transactions,  for cash or on terms,  in such
     manner  and  at  such  places  (including   Borrower's  premises)  as  Bank
     determines is commercially reasonable;

     (i) Bank may credit bid and purchase at any public sale; and

     (j) Any  deficiency  that exists after  disposition  of the  Collateral  as
     provided above will be paid immediately by Borrower.

     9.2 Exim Direction.  Upon the occurrence of an Event of Default,  Exim Bank
shall have a right to: (i) direct Bank to exercise  the  remedies  specified  in
section 9.1 and (ii)  request  that Bank  accelerate  the  maturity of any other
loans to Borrower as to which Bank has a right to accelerate.

     9.3 Exim Notification. Bank shall have the right to immediately notify Exim
Bank in writing if it has  knowledge of the  occurrence  of any of the following
events:  (1) any failure to pay any amount due under this Loan Exim Agreement or
the Note; (2) the Borrowing  Base is less than the sum of  outstanding  Advances
hereunder;  (3) any  failure to pay when due any  amount  payable to Bank by the
Borrower  under any loan(s)  extended by Bank to Borrower;  (4) the filing of an
action for debtor's  relief by,  against,  or on behalf of Borrower;  or (5) any
threatened or pending  material  litigation  against  Borrower,  or any material
dispute involving Borrower.

     In the event that it sends  such a  notification  to Exim Bank,  Bank shall
have the right to  thereafter  send Exim Bank a written  report on the status of
the events covered by said  notification on each Business Day which occurs every
thirty (30) calendar days after the date of said  notification,  until such time
as Bank files a claim with Exim Bank or said  default or other  events have been
cured.  Bank shall not have any  obligation to make any Advances  following said
notification to Exim Bank,  unless Exim Bank gives its written approval thereto.
If directed to do so by Exim Bank,  Bank shall have a right promptly to exercise
any rights it may have against Borrower to demand the immediate repayment of all
amounts outstanding under the Exim Loan Documents.

     9.4  Remedies  Cumulative.  Bank's  rights  and  remedies  under  this Exim
Agreement,  the Exim Loan  Documents,  the Domestic Loan Documents and all other
agreements  shall be  cumulative.  Bank shall have all other rights and remedies
not inconsistent  herewith as provided under the Code, by law, or in equity.  No
exercise  by Bank of one right or remedy  shall be  deemed an  election,  and no
waiver by Bank of any Event of  Default  on  Borrower's  part  shall be deemed a
continuing  waiver.  No delay by Bank shall  constitute a waiver,  election,  or
acquiescence by it.

     10. WAIVERS; INDEMNIFICATION

     10.1 Demand;  Protest.  Borrower waives demand, protest, notice of protest,
notice of  dishonor,  notice of payment and  nonpayment,  notice of any default,
nonpayment at maturity, release, compromise,  settlement,  extension, or renewal
of accounts, documents,  instruments,  chattel paper, and guarantees at any time
held by Bank on which Borrower may in any way be liable.

     10.2 Bank's  Liability  for  Inventory.  So long as Bank  complies with its
obligations,  if any, under Section 9207 of the Code,  Bank shall not in any way
or manner be liable or responsible  for: (a) the  safekeeping of the Collateral;
(b) any loss or damage  thereto  occurring  or  arising in any manner or fashion
from any  cause;  (c) any  diminution  in the value  thereof;  or (d) any act or
default of any carrier, warehouseman, bailee, forwarding agency, or other person
whomsoever.  All risk of loss,  damage or destruction of the Collateral shall be
borne by Borrower.

     10.3  Indemnification.  Borrower  agrees  to  defend,  indemnify  and  hold
harmless  Bank  and  its  officers,  employees,  and  agents  against:  (a)  all
obligations,  demands,  claims, and liabilities claimed or asserted by any other
party in connection with the  transactions  contemplated by this Exim Agreement,
and (b) all losses or Exim Bank Expenses in any way suffered,  incurred, or paid
by Bank as a result of or in any way arising out of, following, or consequential
to transactions between Bank and Borrower whether under this Exim Agreement,  or
otherwise (including without limitation reasonable attorneys fees and expenses),
except for losses caused by Bank's gross negligence or willful misconduct.

     11. NOTICES

     Unless otherwise provided in this Exim Agreement, all notices or demands by
any party relating to this Exim Agreement or any other agreement entered into in
connection herewith shall be in writing and (except for financial statements and
other  informational  documents which may be sent by first-class  mail,  postage
prepaid)  shall be  personally  delivered  or sent by  certified  mail,  postage
prepaid,  return receipt requested,  or by telefacsimile to Borrower or to Bank,
as the case may be, at the address set forth in the Domestic Loan Documents. The
parties  hereto  may change  the  address  at which they are to receive  notices
hereunder, by notice in writing in the foregoing manner given to the other.

     12. CHOICE OF LAW AND VENUE; JURY TRIAL WAIVER

     This Exim Agreement shall be governed by, and construed in accordance with,
the internal laws of the State of  California,  without  regard to principles of
conflicts  of law.  Each of Borrower  and Bank hereby  submits to the  exclusive
jurisdiction  of the state and  Federal  courts  located  in the County of Santa
Clara,  State of  California.  BORROWER AND BANK HEREBY  WAIVE THEIR  RESPECTIVE
RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT
OF  ANY OF THE  EXIM  LOAN  DOCUMENTS  OR ANY OF THE  TRANSACTIONS  CONTEMPLATED
THEREIN,  INCLUDING CONTRACT CLAIMS, TORT CLAIMS, BREACH OF DUTY CLAIMS, AND ALL
OTHER COMMON LAW OR STATUTORY CLAIMS.

     13. GENERAL PROVISIONS

     13.1  Successors and Assigns.  This Exim Agreement  shall bind and inure to
the benefit of the respective  successors  and permitted  assigns of each of the
parties;  provided,  however,  that neither this Exim  Agreement  nor any rights
hereunder  may be assigned by Borrower  without  Bank's prior  written  consent,
which consent may be granted or withheld in Bank's sole  discretion.  Bank shall
have the right  without the consent of or notice to Borrower to sell,  transfer,
negotiate,  or grant  participations  in all or any part of, or any  interest in
Bank's rights and benefits hereunder.

     13.2 Time of Essence.  Time is of the essence  for the  performance  of all
obligations set forth in this Exim Agreement.

     13.3  Severability  of  Provisions.  Each  provision of this Exim Agreement
shall be severable  from every other  provision of this Exim  Agreement  for the
purpose of determining the legal enforceability of any specific provision.

     13.4  Amendments  in  Writing.  This Exim  Agreement  cannot be  changed or
terminated  orally.  Without the prior written consent of Exim Bank, no material
amendment  of or  deviation  from the terms of this Exim  Agreement  or the Note
shall be made that would  adversely  affect the interests of Exim Bank under the
Exim Guarantee,  including  without  limitation the  rescheduling of any payment
terms provided for in this Exim Agreement. All prior agreements, understandings,
representations,  warranties,  and negotiations  between the parties hereto with
respect to the subject  matter of this Exim  Agreement,  if any, are merged into
this Exim Agreement, provided that any UCC-1 financing statements, or amendments
thereto, or filings with respect to Borrower's  intellectual property,  filed by
Bank to secure  the  Obligations  of  Borrower  shall  remain in full  force and
effect.

     13.5  Counterparts.  This Exim  Agreement  may be executed in any number of
counterparts and by different parties on separate  counterparts,  each of which,
when  executed  and  delivered,  shall be deemed to be an  original,  and all of
which,  when  taken  together,  shall  constitute  but  one and  the  same  Exim
Agreement.

     13.6 Survival.  All covenants,  representations and warranties made in this
Exim  Agreement  shall  continue  in  full  force  and  effect  so  long  as any
Obligations  (excluding  Obligations  under  Sections 2.6 and 10.3 to the extent
they remain inchoate at the time that outstanding  payment  Obligations are paid
in full) remain outstanding.  The obligations of Borrower to indemnify Bank with
respect to the expenses,  damages,  losses,  costs and liabilities  described in
Section 10.3 shall survive until all applicable  statute of limitations  periods
with respect to actions that may be brought against Bank have run.

     13.7 Effect of Amendment and  Restatement.  This Exim Agreement is intended
to and does  completely  amend  and  restate,  without  novation,  the  Original
Agreement.  All advances or loans outstanding  under the Original  Agreement are
and shall continue to be  outstanding  under this Exim  Agreement.  All security
interests granted under the Original Agreement are hereby confirmed and ratified
and shall continue to secure all Obligations under this Exim Agreement.

     13.8 Confidentiality.  In handling any confidential  information Bank shall
exercise  the same  degree of care that it  exercises  with  respect  to its own
proprietary information of the same types to maintain the confidentiality of any
non-public  information  thereby  received  or  received  pursuant  to this Exim
Agreement  except that  disclosure  of such  information  may be made (i) to the
subsidiaries  or  affiliates  of  Bank  in  connection  with  their  present  or
prospective business relations with Borrower, (ii) to prospective transferees or
purchasers of any interest in the Loans,  provided that they have entered into a
comparable  confidentiality  agreement in favor of Borrower and have delivered a
copy to  Borrower,  (iii)  as  required  by  law,  regulations,  rule or  order,
subpoena,  judicial  order  or  similar  order  and (iv) as may be  required  in
connection  with  the  examination,  audit  or  similar  investigation  of Bank.
Confidential  information  hereunder shall not include  information that either:
(a) is in the  public  domain or in the  knowledge  or  possession  of Bank when
disclosed to Bank, or becomes part of the public domain after disclosure to Bank
through  no fault of Bank;  or (b) is  disclosed  to the Bank by a third  party,
provided  the Bank  does not have  actual  knowledge  that such  third  party is
prohibited from disclosing such  information.  Notwithstanding  any provision of
this  Exim  Agreement  to  the  contrary,   neither  Borrower  nor  any  of  its
Subsidiaries will be required to disclose,  permit the inspection,  examination,
copying or making extracts of, or discussions  of, any document,  information or
other matter that (i) prior to the occurrence of an Event of Default constitutes
non-financial trade secrets, or (ii) in respect to which disclosure to the Banks
(or  designated  representative)  is  then  prohibited  by  (a)  law,  or (b) an
agreement  binding upon Borrower or any Subsidiary  that was not entered into by
Borrower or such  Subsidiary for the primary  purpose of concealing  information
from Banks.

     IN WITNESS  WHEREOF,  the parties hereto have caused this Exim Agreement to
be executed as of the date first above written.

                                 CASTELLE


                                 By:     /s/ Randall I. Bambrough

                                 Randall I. Bambrough

                                 Title:  Vice President of Finance



                                 SILICON VALLEY BANK


                                 By:    /s/ Peter A. Kidder

                                 Peter Kidder

                                 Title:   Vice President






                                    EXHIBIT A


     The Collateral  shall consist of all right,  title and interest of Borrower
in and to the following:

     (a) All goods and  equipment  now owned or hereafter  acquired,  including,
without limitation, all machinery,  fixtures, vehicles (including motor vehicles
and trailers),  and any interest in any of the foregoing,  and all  attachments,
accessories,   accessions,   replacements,    substitutions,    additions,   and
improvements to any of the foregoing, wherever located;

     (b) All  inventory,  now owned or hereafter  acquired,  including,  without
limitation,  all  merchandise,  raw  materials,  parts,  supplies,  packing  and
shipping  materials,  work in  process  and  finished  products  including  such
inventory  as is  temporarily  out of  Borrower's  custody or  possession  or in
transit and including any returns upon any accounts or other proceeds, including
insurance  proceeds,  resulting  from  the  sale  or  disposition  of any of the
foregoing  and  any  documents  of  title  representing  any of the  above,  and
Borrower's Books relating to any of the foregoing;

     (c) All  contract  rights and general  intangibles  now owned or  hereafter
acquired, including, without limitation,  goodwill,  trademarks,  service marks,
trade  styles,  trade  names,  patents,  patent  applications,  leases,  license
agreements,   franchise  agreements,   blueprints,  drawings,  purchase  orders,
customer lists, route lists, infringements,  claims, computer programs, computer
discs, computer tapes, literature,  reports, catalogs, design rights, income tax
refunds, payments of insurance and rights to payment of any kind;

     (d) All now existing  and  hereafter  arising  accounts,  contract  rights,
royalties,  license rights and all other forms of obligations  owing to Borrower
arising out of the sale or lease of goods,  the  licensing of  technology or the
rendering of services by Borrower, whether or not earned by performance, and any
and all credit insurance,  guaranties,  and other security therefor,  as well as
all  merchandise  returned to or  reclaimed  by Borrower  and  Borrower's  Books
relating to any of the foregoing;

     (e)  All  documents,   cash,  deposit  accounts,   securities  (other  than
securities of foreign Subsidiaries), letters of credit, certificates of deposit,
instruments  and chattel  paper now owned or hereafter  acquired and  Borrower's
Books relating to the foregoing;

     (f) All copyright rights,  copyright applications,  copyright registrations
and like  protections in each work of authorship  and  derivative  work thereof,
whether  published or unpublished,  now owned or hereafter  acquired;  all trade
secret  rights,  including  all  rights  to  unpatented  inventions,   know-how,
operating manuals,  license rights and agreements and confidential  information,
now owned or hereafter  acquired;  all mask work or similar rights available for
the protection of  semiconductor  chips,  now owned or hereafter  acquired;  all
claims for damages by way of any past, present and future infringement of any of
the foregoing; and

     (g) Any and all claims,  rights and  interests  in any of the above and all
substitutions for, additions and accessions to and proceeds thereof.




 



                                    EXHIBIT B
                            Revolving Promissory Note
                              (Export-Import Line)
$3,000,000                                                 Palo Alto, California
                                                                   June 20, 1996

     FOR VALUE RECEIVED, the undersigned, Castelle (the "Borrower"), promises to
pay to the order of Silicon  Valley Bank  ("Bank"),  at such place as the holder
hereof may  designate,  in lawful  money of the United  States of  America,  the
aggregate unpaid principal amount of all advances  ("Advances")  made by Bank to
Borrower under the terms of this Note, up to a maximum principal amount of Three
Million Dollars ($3,000,000).  Borrower shall also pay interest on the aggregate
unpaid principal amount of such Advances at the rates and in accordance with the
terms of the Export-Import Bank Loan and Security Agreement between Borrower and
Bank of even date herewith,  as amended from time to time (the "Loan Agreement")
on the last  Business  Day of each  month  after an Advance  has been made.  The
entire  principal  amount and all accrued  interest  shall be due and payable on
June 16, 1997, or on such earlier date, as provided for in the Loan Agreement.

     Borrower  irrevocably waives the right to direct the application of any and
all  payments  at any time  hereafter  received  by Bank  from or on  behalf  of
Borrower,  and Borrower  irrevocably  agrees that Bank shall have the continuing
exclusive  right to apply  any and all such  payments  against  the then due and
owing  obligations of Borrower as Bank may deem  advisable.  In the absence of a
specific  determination  by Bank with respect  thereto,  all  payments  shall be
applied in the following order: (a) then due and payable fees and expenses;  (b)
then due and payable interest payments and mandatory  prepayments;  and (c) then
due and payable principal payments and optional prepayments.

     Bank is hereby  authorized  by  Borrower  to  endorse  on Bank's  books and
records each Advance made by Bank under this Note and the amount of each payment
or  prepayment  of  principal of each such  Advance  received by Bank;  it being
understood, however, that failure to make any such endorsement (or any errors in
notation)  shall not affect the obligations of Borrower with respect to Advances
made  hereunder,  and  payments of  principal  by Borrower  shall be credited to
Borrower  notwithstanding  the  failure  to make a  notation  (or any  errors in
notation) thereof on such books and records.

     Borrower promises to pay Bank all reasonable costs and reasonable  expenses
of collection of this Note and to pay all reasonable attorneys' fees incurred in
such  collection  or in any suit or action to collect this Note or in any appeal
thereof. Borrower waives presentment, demand, protest, notice of protest, notice
of dishonor, notice of nonpayment,  and any and all other notices and demands in
connection with the delivery, acceptance, performance, default or enforcement of
this Note, as well as any applicable statute of limitations. No delay by Bank in
exercising any power or right  hereunder  shall operate as a waiver of any power
or right. Time is of the essence as to all obligations hereunder.

     This Note is issued pursuant to the Loan Agreement,  which shall govern the
rights and obligations of Borrower with respect to all obligations hereunder.

     This Note  shall be  deemed to be made  under,  and shall be  construed  in
accordance with and governed by, the laws of the State of California,  excluding
conflicts of laws principles.

                                       CASTELLE


                                       By:    /s/ Randall I. Bambrough
                                              ------------------------
                                       Randall I. Bambrough

                                       Title: Vice President of Finance
                                              -------------------------





 



                                    EXHIBIT C

                   LOAN PAYMENT/ADVANCE TELEPHONE REQUEST FORM

              DEADLINE FOR SAME DAY PROCESSING IS 3:00 P.M., P.S.T.


TO:  CENTRAL CLIENT SERVICE DIVISION               DATE:
                                                        ------------------------


FAX#:  (408) 432-3249                              TIME:
                                                       -------------------------



FROM: Castelle
      CLIENT NAME (BORROWER)

REQUESTED BY:
             AUTHORIZED SIGNER'S NAME

AUTHORIZED SIGNATURE:

PHONE NUMBER:

FROM ACCOUNT #                                        TO ACCOUNT #
 

REQUESTED TRANSACTION TYPE                            REQUEST DOLLAR AMOUNT

PRINCIPAL INCREASE (ADVANCE)
PRINCIPAL PAYMENT (ONLY)
INTEREST PAYMENT (ONLY)
PRINCIPAL AND INTEREST (PAYMENT)

OTHER INSTRUCTIONS:


     All representations and warranties of Borrower stated in the Loan Agreement
are true,  correct and complete in all  material  respects as of the date of the
telephone  request  for and Advance  confirmed  by this  Borrowing  Certificate;
provided, however, that those representations and warranties expressly referring
to another date shall be true,  correct and complete in all material respects as
of such date.




                                  BANK USE ONLY

TELEPHONE REQUEST:

The following  person is  authorized  to request the loan payment  transfer/loan
advance on the advance designated account and is known to me.


                  Authorized Requester        Phone #


                  Received By (Bank)          Phone #


                  __________________________
                  Authorized Signature (Bank)






 



                                    Exhibit D

                           BORROWING BASE CERTIFICATE
                               COLLATERAL SCHEDULE
                          (FOREIGN A/R LINE OF CREDIT)
- --------------------------------------------------------------------------------

Borrower:   Castelle                         Lender:      Silicon Valley Bank
            3255-3 Scott Boulevard                        3003 Tasman Drive
            Santa Clara, CA  95054                        Santa Clara, CA  95054

Commitment Amount:            $3,000,000
- --------------------------------------------------------------------------------
FOREIGN ACCOUNTS RECEIVABLE FROM EXPORT ACTIVITIES

         1.       Foreign Accounts Receivable Book Value as of
         2.       Additions (please explain on reverse)
         3.       TOTAL FOREIGN ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE DEDUCTIONS

         4.       Term in excess of 90 days
         5.       Amounts over 90 days (unless insured, then 90 days)
         6.       Balance of 50% over 90 day accounts
         7.       Excess 25% concentration
         8.       Credit Balances over 120 days
         9.       Accounts not payable in the U.S. Dollars or
                  payable in other than U.S. Dollars
         10.      Government and Military Accounts
         11.      Contra Accounts
         12.      Promotion, Demo or Consignment Accounts
         13.      Intercompany/Employee and Affiliate Accounts
         14.      Accounts in the form of L/Cs, if subject items
                  have not yet been shipped by Borrower
         15.      Accounts arising from Inventory not originally
                  located in and shipped from the U.S.
         16.      Accounts arising from the sale of defense articles or items
         17.      Accounts of buyers located in or from countries
                  in which shipment is prohibited or no coverage available
         18.      Amounts due and collectable outside U.S.
         19.      Other exclusions
         20.      TOTAL ACCOUNTS RECEIVABLE DEDUCTIONS
         21.      Eligible Accounts (No. 3 - No. 20)
         22.      Loan Value of Accounts (90%-Advance)

FOREIGN INVENTORY

         23.      Foreign Inventory Value as of _________
         24.      Additions (please explain on reverse)
         25.      TOTAL FOREIGN INVENTORY

FOREIGN INVENTORY DEDUCTIONS

         26.      Outside U.S.
         27.      Consignment
         28.      Proprietary Software
         29.      Damaged/Defective
         30.      Previously Exported
         31.      Defense Articles/Services
         32.      Prohibited County
         33.      No Coverage County
         34.      Ineligible A/R
         35.      TOTAL DEDUCTIONS
         36.      Eligible Inventory (No. 23 - No. 35)
         37.      Loan Value of Inventory (40% - No. 35)

BALANCES
         38.      Maximum Loan Amount
         39.      Total Available (Lesser of (No. 22 plus No. 37)
         40.      Present balance owing on Line of Credit
         41.      Outstanding under Sublimits
         42.      RESERVE POSITION (No. 39 - (No. 40 + No. 41))

The undersigned represents and warrants that the foregoing is true, complete and
correct, and that the information reflected in this Collateral Schedule complies
with the  representations  and warranties  set forth in the Borrower  Agreement,
executed by Borrower and  acknowledged  by Lender,  and the  Export-Import  Bank
Amended and  Restated  Loan and  Security  Agreement,  executed by Borrower  and
acknowledged by Lender dated June 20, 1996, as may be amended from time to time,
as if all  representations  and warranties were made as of the date hereof,  and
that  Borrower is, and shall remain,  in full  compliance  with its  agreements,
covenants,  and  obligations  under such  agreement.  Such  representations  and
warranties  include,  without  limitation,  the  following:  Borrower  is  using
disbursements  only for the purpose of enabling  Borrower to finance the cost of
manufacturing,  producing,  purchasing  or selling  items  intended  for export.
Borrower is not using  disbursements  for the purpose of: (a)  servicing  any of
Borrower's unrelated  pre-existing or future  indebtedness;  (b) acquiring fixed
assets or  capital  goods for the use of  Borrower's  business;  (c)  acquiring,
equipping,  equipping or renting commercial space outside the United States; (d)
supporting research and development, (e) paying salaries of non-U.S. citizens or
non-U.S.  permanent  residents  who are  located  in the  offices  of the United
States,  or  (f)  serving  as  a  retainage  or  warranty  bond.   Additionally,
disbursements are not being used to finance the manufacture, purchase or sale of
any of the  following:  (a) Items to be sold to a buyer  located in a country in
which the Export  Import Bank of the United  States is legally  prohibited  from
doing business; (b) that part of the cost of the items which is not U.S. Content
unless  such part is not  greater  than fifty  percent  (50%) of the cost of the
items and is  incorporated  into the items in the  United  States;  (c)  defense
articles or defense services or items directly or indirectly destined for use by
military  organizations  designed  primarily for military use (regardless of the
nature  or  actual  use of the  items);  or (d)  any  items  to be  used  in the
construction, alteration, operation or maintenance of nuclear power, enrichment,
reprocessing, research or heavy water production facilities.

Sincerely,

Castelle


By:
Name:
         Chief Financial Officer
Date:


                                                         BANK USE ONLY

                                                         Received by:

                                                         Date:

                                                         Verified By:




                            Revolving Promissory Note

$3,000,000                                                 Palo Alto, California
                                                           June 20, 1996

     FOR VALUE RECEIVED, the undersigned, Castelle (the "Borrower"), promises to
pay to the order of Silicon  Valley Bank  ("Bank"),  at such place as the holder
hereof may  designate,  in lawful  money of the United  States of  America,  the
aggregate unpaid principal amount of all advances  ("Advances")  made by Bank to
Borrower under the terms of this Note, up to a maximum principal amount of Three
Million Dollars ($3,000,000).  Borrower shall also pay interest on the aggregate
unpaid principal amount of such Advances at the rates and in accordance with the
terms of the Export-Import Bank Loan and Security Agreement between Borrower and
Bank of even date herewith,  as amended from time to time (the "Loan Agreement")
on the last  Business  Day of each  month  after an Advance  has been made.  The
entire  principal  amount and all accrued  interest  shall be due and payable on
June 16, 1997, or on such earlier date, as provided for in the Loan Agreement.

     Borrower  irrevocably waives the right to direct the application of any and
all  payments  at any time  hereafter  received  by Bank  from or on  behalf  of
Borrower,  and Borrower  irrevocably  agrees that Bank shall have the continuing
exclusive  right to apply  any and all such  payments  against  the then due and
owing  obligations of Borrower as Bank may deem  advisable.  In the absence of a
specific  determination  by Bank with respect  thereto,  all  payments  shall be
applied in the following order: (a) then due and payable fees and expenses;  (b)
then due and payable interest payments and mandatory  prepayments;  and (c) then
due and payable principal payments and optional prepayments.

     Bank is hereby  authorized  by  Borrower  to  endorse  on Bank's  books and
records each Advance made by Bank under this Note and the amount of each payment
or  prepayment  of  principal of each such  Advance  received by Bank;  it being
understood, however, that failure to make any such endorsement (or any errors in
notation)  shall not affect the obligations of Borrower with respect to Advances
made  hereunder,  and  payments of  principal  by Borrower  shall be credited to
Borrower  notwithstanding  the  failure  to make a  notation  (or any  errors in
notation) thereof on such books and records.

     Borrower promises to pay Bank all reasonable costs and reasonable  expenses
of collection of this Note and to pay all reasonable attorneys' fees incurred in
such  collection  or in any suit or action to collect this Note or in any appeal
thereof. Borrower waives presentment, demand, protest, notice of protest, notice
of dishonor, notice of nonpayment,  and any and all other notices and demands in
connection with the delivery, acceptance, performance, default or enforcement of
this Note, as well as any applicable statute of limitations. No delay by Bank in
exercising any power or right  hereunder  shall operate as a waiver of any power
or right. Time is of the essence as to all obligations hereunder.

     This Note is issued pursuant to the Loan Agreement,  which shall govern the
rights and obligations of Borrower with respect to all obligations hereunder.

     This Note  shall be  deemed to be made  under,  and shall be  construed  in
accordance with and governed by, the laws of the State of California,  excluding
conflicts of laws principles.

                    Castelle


                    By:     /s/ Randall I. Bambrough

                            Randall I. Bambrough

                    Title:  Vice President of Finance





 



                         CORPORATE RESOLUTIONS TO BORROW


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

Borrower:             Castelle

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

     I, the undersigned Secretary or Assistant Secretary of Castelle,  Inc. (the
"Corporation"),  HEREBY  CERTIFY that the  Corporation is organized and existing
under and by virtue of the laws of the State of California.

     I FURTHER  CERTIFY  that the  Articles of  Incorporation  and Bylaws of the
Corporation previously delivered to Silicon Valley Bank remain in full force and
effect and have not been amended or modified.

     I FURTHER CERTIFY that at a meeting of the Directors of the Corporation (or
by other duly authorized corporate action in lieu of a meeting), duly called and
held, at which a quorum was present and voting,  the following  resolutions were
adopted.

     BE IT  RESOLVED,  that  any  one  (1)  of  the  following  named  officers,
employees,  or agents of this  Corporation,  whose actual  signatures  are shown
below:

         NAMES                  POSITION                 ACTUAL SIGNATURES

Randall I. Bambrough     Vice President of Finance    /s/ Randall I. Bambrough
- --------------------     -------------------------    ------------------------


acting for an on behalf of this Corporation and as its act and deed be, and they
hereby are, authorized and empowered:

     Borrow  Money.  To  borrow  from  time to time  from  Silicon  Valley  Bank
("Bank"),  on such terms as may be agreed upon between the officers,  employees,
or agents  and Bank,  such sum or sums of money as in their  judgment  should be
borrowed,  without  limitation,  including  such sums as are  specified  in that
certain  Export-Import  Bank  Amended and Restated  Loan and Security  Agreement
dated as of June 20, 1996 (the "Loan Agreement").

     Execute Notes.  To execute and deliver to Bank the promissory note or notes
of the  Corporation,  on Lender's  forms,  at such rates of interest and on such
terms as may be agreed  upon,  evidencing  the sums of money so  borrowed or any
indebtedness  of the  Corporation  to Bank,  and also to execute  and deliver to
Lender  one  or  more   renewals,   extensions,   modifications,   refinancings,
consolidations, or substitutions for one or more of the notes, or any portion of
the notes.

     Grant  Security.  To grant a security  interest  to Bank in the  Collateral
described in the Loan Agreement, which security interest shall secure all of the
Corporation's Obligations, as described in the Loan Agreement.

     Negotiate Items. To draw, endorse, and discount with Bank all drafts, trade
acceptances,  promissory notes, or other evidences of indebtedness payable to or
belonging to the  Corporation or in which the  Corporation may have an interest,
and either to receive cash for the same or to cause such proceeds to be credited
to the account of the Corporation with Bank, or to cause such other  disposition
of the proceeds derived therefrom as they may deem advisable.

     Letters  of  Credit.  To execute  letter of credit  applications  and other
related documents pertaining to Bank's issuance of letters of credit.

     Further  Acts. In the case of lines of credit,  to designate  additional or
alternate individuals as being authorized to request advances thereunder, and in
all cases, to do and perform such other acts and things, to pay any and all fees
and costs,  and to execute and deliver such other  documents  and  agreements as
they may in their  discretion  deem  reasonably  necessary or proper in order to
carry into effect the provisions of these Resolutions.

     BE IT FURTHER RESOLVED,  that any and all acts authorized pursuant to these
resolutions and performed  prior to the passage of these  resolutions are hereby
ratified and  approved,  that these  Resolutions  shall remain in full force and
effect  and Bank may rely on these  Resolutions  until  written  notice of their
revocation  shall have been  delivered to and received by Bank.  Any such notice
shall not affect any of the Corporation's agreements or commitments in effect at
the time notice is given.

     I FURTHER CERTIFY that the officers,  employees, and agents named above are
duly elected,  appointed, or employed by or for the Corporation, as the case may
be, and occupy the positions set forth opposite their respective names; that the
foregoing  Resolutions now stand of record on the books of the Corporation;  and
that the  Resolutions are in full force and effect and have not been modified or
revoked in any manner whatsoever.

     I FURTHER  CERTIFY  that the  Articles of  Incorporation  and Bylaws of the
Corporation are in full force and effect in the form attached hereto.

     IN WITNESS WHEREOF, I have hereunto set my hand on June 20, 1996 and attest
that the  signatures  set  opposite  the names  listed  above are their  genuine
signatures.


                                 CERTIFIED TO AND ATTESTED BY:


                                 /s/ Randall I Bambrough
                                 -----------------------

                                 Randall I. Bambrough

                                 Chief Financial Officer







                     COLLATERAL ASSIGNMENT, PATENT MORTGAGE
                             AND SECURITY AGREEMENT


     This Collateral Assignment,  Patent Mortgage and Security Agreement is made
as of  June  20,  1996,  by  and  between  CASTELLE,  a  California  corporation
("Assignor"),   and  SILICON  VALLEY  BANK,  a  California  banking  corporation
("Assignee").


                                    RECITALS

     A. Assignee has agreed to lend to Assignor certain funds (the "Loan"),  and
Assignor desires to borrow such funds from Assignee  pursuant to the terms of an
Amended and Restated Loan and Security  Agreement and Export-Import  Amended and
Restated Loan and Security Agreement,  both of even date herewith  (collectively
referred to as the "Loan Agreement").

     B. In order to induce  Assignee  to make the Loan,  Assignor  has agreed to
assign  certain  intangible  property to Assignee  for  purposes of securing the
obligations of Assignor to Assignee.

     NOW, THEREFORE, THE PARTIES HERETO AGREE AS FOLLOWS:

     1.  Assignment,   Patent  Mortgage  and  Grant  of  Security  Interest.  As
collateral  security for the prompt and complete  payment and performance of all
of Assignor's  present or future  indebtedness,  obligations  and liabilities to
Assignee,  Assignor  hereby  assigns,  transfers,  conveys and grants a security
interest and mortgage to Assignee,  as  security,  in and to  Assignor's  entire
right,  title and  interest in, to and under the  following  (all of which shall
collectively be called the "Collateral"):

     (a)  Any  and  all  copyright  rights,  copyright  applications,  copyright
     registrations   and  like  protections  in  each  work  or  authorship  and
     derivative  work thereof,  whether  published or unpublished and whether or
     not the same also  constitutes a trade secret,  now or hereafter  existing,
     created,  acquired or held, including without limitation those set forth on
     Exhibit A attached hereto (collectively, the "Copyrights");

     (b) Any and all trade secrets, and any and all intellectual property rights
     in computer  software  and  computer  software  products  now or  hereafter
     existing, created, acquired or held;

     (c) Any and all design  rights  which may be  available  to Assignor now or
     hereafter existing, created, acquired or held;

     (d) All patents, patent applications and like protections including without
     limitation  improvements,  divisions,  continuations,  renewals,  reissues,
     extensions  and   continuations-in-part  of  the  same,  including  without
     limitation  the  patents  and  patent  applications  set forth on Exhibit B
     attached hereto (collectively, the "Patents");

     (e) Any  trademark  and  servicemark  rights,  whether  registered  or not,
     applications   to  register  and   registrations   of  the  same  and  like
     protections,  and the entire goodwill of the business of Assignor connected
     with and symbolized by such trademarks,  including without limitation those
     set forth on Exhibit C attached hereto (collectively, the "Trademarks");

     (f) Any and all  claims  for  damages  by way of past,  present  and future
     infringement of any of the rights included above,  with the right,  but not
     the  obligation,  to sue for and  collect  such  damages  for  said  use or
     infringement of the intellectual property rights identified above;

     (g) All licenses or other rights to use any of the  Copyrights,  Patents or
     Trademarks, and all license fees and royalties arising from such use to the
     extent permitted by such license or rights; and

     (h) All  amendments,  renewals  and  extensions  of any of the  Copyrights,
     Trademarks or Patents; and

     (i)  All  proceeds  and  products  of  the  foregoing,   including  without
     limitation  all  payments  under  insurance  or any  indemnity  or warranty
     payable in respect of any of the foregoing.

     THE  INTEREST  IN THE  COLLATERAL  BEING  ASSIGNED  HEREUNDER  SHALL NOT BE
CONSTRUED  AS A CURRENT  ASSIGNMENT,  BUT AS A CONTINGENT  ASSIGNMENT  TO SECURE
ASSIGNOR'S OBLIGATIONS TO ASSIGNEE UNDER THE LOAN AGREEMENT.

     2.  Authorization  and Request.  Assignor  authorizes and requests that the
Register of Copyrights and the  Commissioner  of Patents and  Trademarks  record
this conditional assignment.

     3. Covenants and Warranties.  Assignor represents,  warrants, covenants and
agrees as follows:

     (a)  Assignor  is  now  the  sole  owner  of  the  Collateral,  except  for
     non-exclusive licenses granted by Assignor to its customers in the ordinary
     course of business;

     (b)  Performance of this  Assignment  does not conflict with or result in a
     breach of any agreement to which  Assignor is party or by which Assignor is
     bound, except to the extent that certain  intellectual  property agreements
     prohibit the  assignment of the rights  thereunder to a third party without
     the licensor's or other party's consent and this Assignment  constitutes an
     assignment;

     (c) During  the term of this  Assignment,  Assignor  will not  transfer  or
     otherwise encumber any interest in the Collateral, except for non-exclusive
     licenses  granted by Assignor in the ordinary  course of business or as set
     forth in this Assignment;

     (d) To its knowledge, each of the Patents is valid and enforceable,  and no
     part of the Collateral has been judged invalid or  unenforceable,  in whole
     or in part,  and no claim  has been  made  that any part of the  Collateral
     violates the rights of any third party;

     (e) Assignor shall promptly  advise  Assignee of any material change in the
     composition of the Collateral,  including but not limited to any subsequent
     ownership right of the Assignor in or to any Trademark, Patent or Copyright
     not specified in this Assignment;

     (f)  Assignor  shall (i)  protect,  defend and  maintain  the  validity and
     enforceability of the Trademarks, Patents and Copyrights, (ii) use its best
     efforts to detect  infringements of the Trademarks,  Patents and Copyrights
     and promptly advise Assignee in writing of material  infringements detected
     and (iii) not allow any Trademarks,  Patents or Copyrights to be abandoned,
     forfeited  or  dedicated  to the  public  without  the  written  consent of
     Assignee,  which  shall  not  be  unreasonably  withheld,  unless  Assignor
     determines that reasonable  business  practices suggest that abandonment is
     appropriate.

     (g) Assignor  shall  promptly  register  the most recent  version of any of
     Assignor's Copyrights,  if not so already registered,  and shall, from time
     to time,  execute and file such other  instruments,  and take such  further
     actions as Assignee may reasonably  request from time to time to perfect or
     continue the perfection of Assignee's interest in the Collateral;

     (h) This Assignment creates,  and in the case of after acquired Collateral,
     this  Assignment  will create at the time Assignor first has rights in such
     after acquired Collateral, in favor of Assignee a valid and perfected first
     priority  security interest in the Collateral in the United States securing
     the payment and performance of the  obligations  evidenced by the Note upon
     making the filings referred to in clause (i) below;

     (i) To its  knowledge,  except  for,  and upon,  the filing with the United
     States  Patent  and  Trademark  office  with  respect  to the  Patents  and
     Trademarks  and the Register of Copyrights  with respect to the  Copyrights
     necessary  to  perfect  the  security   interests  and  assignment  created
     hereunder,   and  except  as  has  been  already   made  or  obtained,   no
     authorization,  approval  or other  action  by,  and no notice to or filing
     with, any U.S.  governmental  authority or U.S. regulatory body is required
     either  (i) for the grant by  Assignor  of the  security  interest  granted
     hereby or for the execution,  delivery or performance of this Assignment by
     Assignor in the U.S. or (ii) for the perfection in the United States or the
     exercise by Assignee of its rights and remedies hereunder;

     (j) All information heretofore, herein or hereafter supplied to Assignee by
     or on behalf of Assignor  with  respect to the  Collateral  is accurate and
     complete in all material respects.

     (k)  Assignor  shall not enter into any  agreement  that  would  materially
     impair or conflict with Assignor's obligations hereunder without Assignee's
     prior written  consent,  which consent shall not be unreasonably  withheld.
     Assignor  shall not permit the inclusion in any material  contract to which
     it becomes a party of any provisions that could or might in any way prevent
     the creation of a security  interest in Assignor's  rights and interests in
     any property  included  within the  definition of the  Collateral  acquired
     under  such   contracts,   except  that  certain   contracts   may  contain
     anti-assignment  provisions that could in effect prohibit the creation of a
     security interest in such contracts.

     (l) Upon any  executive  officer of  Assignor  obtaining  actual  knowledge
     thereof,  Assignor  will promptly  notify  Assignee in writing of any event
     that materially adversely affects the value of any Collateral,  the ability
     of  Assignor  to dispose of any  Collateral  or the rights and  remedies of
     Assignee  in  relation  thereto,  including  the levy of any legal  process
     against any of the Collateral.

     4.  Assignee's  Rights.   Assignee  shall  have  the  right,  but  not  the
obligation,  to take, at Assignor's  sole expense,  any actions that Assignor is
required under this  Assignment to take but which Assignor fails to take,  after
fifteen (15) days' notice to Assignor.  Assignor  shall  reimburse and indemnify
Assignee  for all  reasonable  costs and  reasonable  expenses  incurred  in the
reasonable exercise of its rights under this section 4.

     5. Inspection Rights. Assignor hereby grants to Assignee and its employees,
representatives  and agents  the right to visit,  during  reasonable  hours upon
prior  reasonable  written  notice to  Assignor,  any of  Assignor's  plants and
facilities  that  manufacture,  install or store  products (or that have done so
during  the  prior  six-month  period)  that  are  sold  utilizing  any  of  the
Collateral,  and to inspect the products and quality  control  records  relating
thereto  upon  reasonable  written  notice  to  Assignor  and as often as may be
reasonably requested.

     6. Further Assurances; Attorney in Fact.

     (a) On a continuing  basis,  Assignor will make,  execute,  acknowledge and
     deliver,  and file and record in the proper filing and recording  places in
     the United States, all such instruments,  including  appropriate  financing
     and continuation  statements and collateral agreements and filings with the
     United States Patent and Trademark  Office and the Register of  Copyrights,
     and  take  all  such  action  as may  reasonably  be  deemed  necessary  or
     advisable,  or as  requested by Assignee,  to perfect  Assignee's  security
     interest in all  Copyrights,  Patents and Trademarks and otherwise to carry
     out the intent and purposes of this Collateral Assignment,  or for assuring
     and  confirming to Assignee the grant or perfection of a security  interest
     in all Collateral.

     (b)  Assignor   hereby   irrevocably   appoints   Assignee  as   Assignor's
     attorney-in-fact,  with full  authority  in the place and stead of Assignor
     and in the name of Assignor, from time to time in Assignee's discretion, to
     take any action and to  execute  any  instrument  which  Assignee  may deem
     necessary  or  advisable  to  accomplish  the  purposes of this  Collateral
     Assignment,   including  (i)  to  modify,  in  its  sole  discretion,  this
     Collateral  Assignment  without first obtaining  Assignor's  approval of or
     signature to such modification by amending Exhibit A, Exhibit B and Exhibit
     C, thereof,  as appropriate,  to include  reference to any right,  title or
     interest  in any  Copyrights,  Patents or  Trademarks  acquired by Assignor
     after the execution  hereof or to delete any reference to any right,  title
     or interest in any  Copyrights,  Patents or Trademarks in which Assignor no
     longer has or claims any right,  title or  interest,  (ii) to file,  in its
     sole  discretion,  one or more  financing or  continuation  statements  and
     amendments thereto, relative to any of the Collateral without the signature
     of Assignor  where  permitted by law and (iii) after the  occurrence  of an
     Event of Default,  to transfer  the  Collateral  into the name of Bank or a
     third party to the extent permitted under the California Uniform Commercial
     Code.

     7.  Events  of  Default.  The  occurrence  of any of  the  following  shall
constitute an Event of Default under the Assignment:

     (a) An Event of Default occurs under the Loan Agreement; or

     (b) Assignor  breaches  any warranty or agreement  made by Assignor in this
     Assignment and, as to any breach that is capable of cure, Assignor fails to
     cure such breach within five (5) days of the occurrence of such breach.

     8. Remedies.  Upon the  occurrence and  continuance of an Event of Default,
Assignee  shall have the right to exercise all the  remedies of a secured  party
under the California Uniform  Commercial Code,  including without limitation the
right to require  Assignor to assemble the Collateral and any tangible  property
in which  Assignee has a security  interest and to make it available to Assignee
at a place designated by Assignee.  Assignee shall have a nonexclusive,  royalty
free  license  to use the  Copyrights,  Patents  and  Trademarks  to the  extent
reasonably necessary to permit Assignee to exercise its rights and remedies upon
the occurrence of an Event of Default. Assignor will pay any expenses (including
reasonable attorneys' fees) incurred by Assignee in connection with the exercise
of any of Assignee's rights hereunder,  including without limitation any expense
incurred in disposing of the Collateral.  All of Assignee's  rights and remedies
with respect to the Collateral shall be cumulative.

     9.  Indemnity.  Assignor  agrees to  defend,  indemnify  and hold  harmless
Assignee and its officers,  employees,  and agents against: (a) all obligations,
demands,  claims,  and  liabilities  claimed or  asserted  by any other party in
connection with the  transactions  contemplated  by this Agreement,  and (b) all
losses or  expenses  in any way  suffered,  incurred,  or paid by  Assignee as a
result  of or  in  any  way  arising  out  of,  following  or  consequential  to
transactions  between  Assignee and Assignor,  whether under this  Assignment or
otherwise   (including  without  limitation   reasonable   attorneys'  fees  and
reasonable expenses),  except for losses arising from or out of Assignee's gross
negligence or willful misconduct.

     10. Reassignment.  At such time as Assignor shall completely satisfy all of
the  obligations  secured  hereunder,  Assignee  shall  execute  and  deliver to
Assignor all deeds,  assignments  and other  instruments  as may be necessary or
proper to revest in  Assignor  full title to the  property  assigned  hereunder,
subject to any disposition thereof which may have been made by Assignee pursuant
hereto.

     11. Course of Dealing.  No course of dealing,  nor any failure to exercise,
nor any delay in  exercising  any  right,  power or  privilege  hereunder  shall
operate as a waiver thereof.

     12.  Attorneys'  Fees. If any action relating to this Assignment is brought
by either party hereto against the other party,  the  prevailing  party shall be
entitled to recover reasonable attorneys' fees, costs and disbursements.

     13. Amendments. This Assignment may be amended only by a written instrument
signed by both parties hereto.

     14.  Counterparts.   This  Assignment  may  be  executed  in  two  or  more
counterparts,  each of  which  shall  be  deemed  an  original  but all of which
together shall constitute the same instrument.

     15. California Law and Jurisdiction;  Jury Waiver. This Assignment shall be
governed by the laws of the State of  California,  without  regard for choice of
law provisions.  Assignor and Assignee consent to the exclusive  jurisdiction of
any state or federal court located in Santa Clara County,  California.  ASSIGNOR
AND ASSIGNEE EACH WAIVE THEIR RESPECTIVE  RIGHTS TO A JURY TRIAL OF ANY CLAIM OR
CAUSE  OF  ACTION  BASED  UPON  OR  ARISING  OUT OF  THE  LOAN  AGREEMENT,  THIS
ASSIGNMENT,  OR ANY OF THE TRANSACTIONS  CONTEMPLATED HEREIN, INCLUDING CONTRACT
CLAIMS,  TORT  CLAIMS,  BREACH  OF DUTY  CLAIMS,  AND ALL  OTHER  COMMON  LAW OR
STATUTORY CLAIMS.

     16.  Confidentiality.  In handling any confidential  information,  Assignee
shall exercise the same degree of care that it exercises with respect to its own
proprietary information of the same types to maintain the confidentiality of any
non-public  information thereby received or received pursuant to this Assignment
except that disclosure of such  information may be made (i) to the affiliates of
Assignee,  (ii) to  prospective  transferees or purchasers of an interest in the
obligations  secured  hereby,  provided that they have entered into a comparable
confidentiality  agreement  in favor of  Assignor  and have  delivered a copy to
Assignor,  (iii)  as  required  by law,  regulation,  rule or  order,  subpoena,
judicial order or similar order,  (iv) as may be required in connection with the
examination,  audit or similar  investigation  of  Assignee  and (v) as Bank may
determine in connection with the enforcement of any remedies hereunder.

     IN WITNESS WHEREOF, the parties hereto have executed this Assignment on the
day and year first above written.


Address of Assignor:                    ASSIGNOR:

3255-3 Scott Boulevard                  CASTELLE
Santa Clara, CA 95054


Attn:                                   By:  /s/ Randall I. Bambrough
Mr. Randall Bambrough
                                                 Randall I. Bambrough

                                        Title: Vice President of Finance


Address of Assignee:                    ASSIGNEE:

3003 Tasman Drive                       SILICON VALLEY BANK
Santa Clara, CA 95054

Attn:                                   By:  /s/ Peter A. Kidder
Mr. Peter Kidder
                                        Peter A. Kidder

                                        Title: Vice President





                                    EXHIBIT A

                                   Copyrights


                             Registration/             Registration/
                              Application               Application
Description                      Number                     Date

UNREGISTERED COPYRIGHTS

SOFTWARE OPTIONS  (VERSIONS 3.5.3 AND/OR 3.7)

FaxPress Multi-protocol Software Option
FaxPress CC:Mail Gateway for NetWare
FaxPress MHS Gateway for NetWare
FaxPress Groupwise Gateway for NetWare
FaxPress OCR Software
FaxPress Billing and Analysis Software
FaxPress Embedded Codes Gateway
FaxPress Print Server Options
FaxWare 4 - Evaluation Copy
FaxWare 4 - Evaluation Upgrade
FaxWare 4 - Starter Pack
FaxWare 4 - 5 User License
FaxWare 4 - Line License

SOFTWARE & HARDWARE UPGRADES

FaxPress 3.7 Software Upgrade for FP 1000, FP2000, FP3000, FP1500 & Office
Connect Fax Server (both Ethernet & Token Ring)
FaxPress 3.5.3 Software Upgrade for FP1000, FP2000, and FP3000 (both Ethernet
and Token Ring)
FaxPress 1500 1-line Upgrade
FaxPress 2000 2-line Upgrade
FaxPress 3000 2-line Upgrade
FaxPress 1500 Upgrade Kit to Faxpress 1500-N (for NT support)
FaxPress 3000 Upgrade Kit to Faxpress 3500 (for NT support & both Ethernet &
Token Ring)
LANpress U/G for 2+2 (both Ethernet and Token Ring)
LANpress U/G for 1+1
LANpress U/G for 1P
LANpress U/G for 2P
LANpress 2P Extra NDS Upgrade Kit
LANpress 2+2 NDS Upgrade Kit
JetPress U/G for XIO Extra
JetPress U/G for MIO Plus Extra
FaxPress firmware upgrade for FP 2000 (both Ethernet and Token Ring)
FaxPress firmware upgrade for FP 1000
FaxPress 3.5.3 firmware and software upgrade for FP1000
FaxPress 3.5.3 firmware and software upgrade for FP2000 (both Ethernet and Token
Ring)
FaxPress 1500 modem upgrade
FaxPress 1500 4 MB, Memory Upgrade

HARDWARE

OfficeConnect Fax Server
FaxPress 1500-N Ethernet (both 1 and 2 lines)
FaxPress 3500 (both Ethernet & Token Ring and both 1 & 2 lines)
FaxPress 1500 Ethernet (both 1 and 2 lines)
FaxPress 3000 (both Ethernet & Token Ring and both 1 & 2 lines)
FaxPress 2000 (both Ethernet & Token Ring and both 1 & 2 lines)
FaxPress 2000 Ethernet 4 lines
Personal FaxPress 100
LANpress Jr. MP
LANpress 1P MP
LANpress 2+1 MP (both Ethernet and Token Ring)
LANpress 3+1 MP
LANpress 1+1 Extra (both Ethernet and Token Ring)
LANpress 1P
LANpress 2P
LANpress 2+2 (both Ethernet and Token Ring)
LANpress 2P Extra with Flash
JetPress MIO Plus EXTRA
JetPress XIO
JetPress MIO Plus
OfficeConnect Print Server
Qnix Internal Print Server
Qnix LP 2+1 MP



 
                                    EXHIBIT B

                                     Patents


                             Registration/             Registration/
                              Application               Application
Description                      Number                     Date
 





                                    EXHIBIT C

                                   Trademarks


                             Registration/             Registration/
                              Application               Application
Description                      Number                     Date










                     EXPORT-IMPORT BANK OF THE UNITED STATES
                        WORKING CAPITAL GUARANTEE PROGRAM


                               BORROWER AGREEMENT

     THIS BORROWER  AGREEMENT (this "Agreement") is made and entered into by the
entity  identified as the Borrower on the signature page hereof (the "Borrower")
and is acknowledged by the institution identified as the Lender on the signature
page hereof (the "Lender").


                                    RECITALS

     A. The  Lender  shall  make a loan (the  "Loan")  to the  Borrower  for the
purpose of providing the Borrower with pre-export working capital to finance the
manufacture,  production or purchase and subsequent of the Items (as hereinafter
defined).

     B. The Loan  shall be in a  principal  amount  (the "Loan  Amount")  not to
exceed at any time  outstanding  the amount  specified in Section  (5)(A) of the
Loan  Authorization  Agreement between the Lender and the Export-Import  Bank of
the United States  ("Eximbank") which is attached hereto as Annex Al or Annex A2
and incorporated  herein as a part of this Agreement.  If the Loan is being made
pursuant to the Lender's  Delegated  Authority  from  Eximbank,  all  references
herein  to the Loan  Authorization  Agreement  shall be deemed to be to the Loan
Authorization Notice provided to Eximbank and the Borrower by the Lender.

     C. The Loan shall be evidenced by a valid and  enforceable  promissory note
payable by the  Borrower  to the order of the Lender  (the  "Note") and shall be
made pursuant to a written agreement related solely thereto between the Borrower
and the Lender (the "Loan Agreement").

     D. A  condition  precedent  to the making of the Loan by the Lender is that
Eximbank  guarantee  the payment of ninety  percent (90%) of the Loan Amount and
all interest  accrued  thereon,  subject to the terms and conditions of a master
guarantee agreement (the "Master Guarantee  Agreement") between Eximbank and the
Lender.

     E. In consideration for and as a condition precedent to the Lender's making
the Loan and  Eximbank's  entering  into the  Master  Guarantee  Agreement,  the
Borrower  shall  execute  this  Agreement  for the  benefit  of the  Lender  and
Eximbank.

     NOW, THEREFORE, the Borrower hereby agrees as follows:



                                    ARTICLE I
                                   DEFINITIONS

     "Accounts  Receivable" shall mean those trade accounts from the sale of the
Items due and  payable  to the  Borrower  in the  United  States  and any notes,
drafts, letters of credit or insurance proceeds supporting payment thereof.

     "Availability Date" shall mean the last date on which the Lender may make a
Disbursement  as set forth in Section (10) of the Loan  Authorization  Agreement
or, if such date is not a Business Day, the next Business Day thereafter.

     "Borrowing  Base"  shall mean the  Collateral  Value as  discounted  by the
applicable Disbursement Rate(s).

     "Borrowing Base Certificate" shall mean the certificate in form provided by
the Lender  and  executed  by the  Borrower  setting  forth the  Borrowing  Base
supporting one or more Disbursements.

     "Business Day" shall mean any day on which the Federal  Reserve Bank of New
York is open for business.

     "Buyer"  shall mean an entity  which has  entered  into one or more  Export
Orders with the Borrower.

     "Closing Date" shall mean the date on which the Loan Documents are executed
by the Borrower.

     "Collateral"  shall mean the property of the Borrower in which the Borrower
has granted to the Lender a valid and enforceable  security interest as security
for the payment of all principal  and interest due under the Loan,  and which is
identified  in Section (6) of the Loan  Authorization  Agreement,  including all
proceeds (cash and non-cash) thereof.

     "Collateral Value" shall mean at any given time the value of all Collateral
against which  Disbursements  may be made as set forth in Section  (5)(C) of the
Loan Authorization Agreement, valued according to GAAP.

     "Country Limitation Schedule" shall mean the most recent schedule published
by Eximbank  and  provided to the  Borrower by the Lender  which sets forth on a
country by country basis whether and under what conditions Eximbank will provide
coverage for the financing of export transactions to countries listed therein.

     "Debarment Regulations" shall have the meaning set forth in Section 2.16.

     "Disbursed  Amount"  shall  mean the  aggregate  outstanding  amount of the
Disbursements.

     "Disbursement"  shall  mean an  advance  of the Loan from the Lender to the
Borrower under the Loan Agreement.

     "Disbursement  Rate" shall mean the rate specified in Section (5)(C) of the
Loan Authorization Agreement for each category of Collateral.

     "Dollars"  or "$"  shall  mean the  lawful  money of the  United  States of
America.

     "Export  Order"  shall  mean a written  export  order or  contract  for the
purchase by the Buyer from the Borrower of any of the Items.

     "GAAP" shall mean the generally  accepted  accounting  principles issued by
the American Institute of Certified Public Accountants.

     "Guarantor" shall mean each person or entity, if any, identified in Section
(3) of the  Loan  Authorization  Agreement  who  shall  guarantee  (jointly  and
severally  if more  than one) the  Borrower's  obligation  to repay all  amounts
outstanding under the Note.

     "Inventory"  shall mean the raw  materials,  work-in-process  and  finished
goods  purchased or  manufactured  by the Borrower for resale and located in the
United States.

     "Items"  shall mean the finished  goods or services  which are intended for
export, as specified in Section (4)(A) of the Loan Authorization Agreement.

     "Letter of Credit" shall mean an  irrevocable  letter of credit  subject to
UCP 500,  payable in the United States or at the issuing bank and issued for the
benefit of the Borrower on behalf of a Buyer in connection  with the purchase of
the Items.

     "Loan  Documents"  shall mean the Note, the Loan Agreement,  this Agreement
and any other instrument,  agreement or document  previously,  simultaneously or
hereafter  executed by the  Borrower  or any  Guarantors  evidencing,  securing,
guaranteeing or in connection with the Loan.

     "Principals" shall have the meaning set forth in Section 2.16.

     "Revolving Loan" shall mean a Loan under which amounts disbursed and repaid
may be disbursed on a continuous basis during the term of the Loan.

     "Transaction Specific Loan" shall mean a Loan under which amounts disbursed
and repaid may not be disbursed again.

     "U.S." or "United  States"  shall mean the United States of America and its
territorial possessions.

     "U.S. Content" shall mean with respect to any Item all the labor, materials
and services which are of U.S. origin or manufacture, and which are incorporated
into an Item in the United States.

                                   ARTICLE II
                           OBLIGATIONS OF THE BORROWER

     2.1 Use of Disbursements. The Borrower shall use Disbursements only for the
purpose  of  enabling  the  Borrower  to  finance  the  cost  of  manufacturing,
producing,   purchasing  or  selling  the  Items.   The  Borrower  may  not  use
Disbursements   for  the  purpose  of:  (a)  servicing  any  of  the  Borrower's
pre-existing or future  indebtedness  unrelated to the Loan; (b) acquiring fixed
assets or  capital  goods for use in the  Borrower's  business;  (c)  acquiring,
equipping or renting  commercial space outside of the United States;  (d) paying
the  salaries of  non-U.S.  citizens or  non-U.S.  permanent  residents  who are
located in office  outside the United  States;  or (e) serving as a retainage or
warranty bond.

     In  addition,  Disbursements  may not be used to finance  the  manufacture,
purchase or sale of any of the following:

     (a) Items to be sold to a Buyer  located in a country in which  Eximbank is
     legally  prohibited  from  doing  business  as  designated  in the  Country
     Limitation Schedule;

     (b) that part of the cost of the  Items  which is not U.S.  Content  unless
     such part is not greater than fifty  percent (50%) of the cost of the Items
     and is incorporated into the Items in the United States;

     (c) defense articles or defense services; or

     (d) without  Eximbank's prior written consent,  any Items to be used in the
     construction,  alteration,  operation  or  maintenance  of  nuclear  power,
     enrichment, reprocessing, research or heavy water production facilities.

     2.2 Borrowing Base  Certificates  and Export Orders.  In order to receive a
Disbursement  under  the  Loan,  the  Borrower  shall  deliver  to the  Lender a
Borrowing Base Certificate  current within the past five (5) Business Days and a
copy of the Export  Order(s)  (or,  for  Revolving  Loans,  if  permitted by the
Lender,  a written  summary of the Export Orders)  against which the Borrower is
requesting a Disbursement. If the Lender permits summaries of Export Orders, the
Borrower  shall also deliver  promptly to the Lender copies of any Export Orders
requested by the Lender. Additionally,  the Borrower shall deliver to the Lender
at least once every  thirty  (30)  calendar  days a Borrowing  Base  Certificate
current  within  the past  five (5)  Business  Days,  which  requirement  may be
satisfied  by  submission  of a Borrowing  Base  Certificate  when  requesting a
Disbursement.

     2.3  Exclusions  from the Borrowing  Base. In  determining  the amount of a
requested  Disbursement,  the Borrower shall exclude from the Borrowing Base the
following:

     (a) any Inventory which is not located in the United States;

     (b) any demonstration Inventory or Inventory sold on consignment;

     (c) any Inventory consisting of proprietary software;

     (d) any Inventory which is damaged, obsolete, returned, defective, recalled
     or unfit for further processing;

     (e) any  Inventory  which  has been  previously  exported  from the  United
     States;

     (f) any Inventory which constitutes defense articles or defense services or
     any Accounts Receivable generated by sales of such Inventory;

     (g) any  Inventory  which is to be  incorporated  into Items  destined  for
     shipment to, and any Account  Receivable in the name of a Buyer located in,
     a country in which  Eximbank is legally  prohibited  from doing business as
     designated in the Country Limitation Schedule;

     (h) any  Inventory  which is to be  incorporated  into Items  destined  for
     shipment to, and any Account  Receivable in the name of a Buyer located in,
     a country  in which  Eximbank  coverage  is not  available  for  commercial
     reasons as designated in the Country Limitation  Schedule,  unless and only
     to the extent that such Items are to be sold to such  country on terms of a
     Letter of Credit confirmed by a bank acceptable to Eximbank;

     (i) any Inventory which is to be  incorporated  into Items whose sale would
     result in an ineligible Account Receivable;

     (j) any Account  Receivable with a term in excess of net one hundred eighty
     (180) days;

     (k) any Account Receivable which is more than sixty (60) calendar days past
     the original due date,  unless it is insured through Eximbank export credit
     insurance  for  comprehensive  commercial  and  political  risk, or through
     Eximbank approved private insurers for a comparable coverage, in which case
     ninety (90) calendar days shall apply;

     (l) any intra-company  Account  Receivable or any Account Receivable from a
     subsidiary  of the  Borrower,  from a person or entity  with a  controlling
     interest in the Borrower or from an entity which shares common  controlling
     ownership with the Borrower;

     (m) any Account Receivable  evidenced by a Letter of Credit, until the date
     of shipment of the Items covered by the subject Letter of Credit;

     (n) any Account Receivable which the Lender of Eximbank,  in its reasonable
     judgment, deems uncollectible for any reason;

     (o) any Account Receivable payable in a currency other than Dollars, except
     as may be approved in writing by Eximbank;

     (p) any Account Receivable from a military Buyer, except as may be approved
     in writing by Eximbank; and

     (q) any Account  Receivable due and collectible  outside the United States,
     except as may be approved in writing by Eximbank.

     2.4 Schedules,  Reports and Other Statements.  The Borrower shall submit to
the Lender in writing  each month (a) an Inventory  schedule  for the  preceding
month and (b) an  Accounts  Receivable  aging  report  for the  preceding  month
detailing the terms of the amounts due from each Buyer.  The Borrower shall also
furnish  to  the  Lender  promptly  upon  request  such  information,   reports,
contracts,  invoices and other data  concerning the Collateral as the Lender may
from time to time specify.

     2.5 Additional Security or Payment.  The Borrower shall at all times ensure
that the Borrowing Base exceeds the Disbursed  Amount. If informed by the Lender
or if the Borrower  otherwise has actual knowledge that the Borrowing Base is at
any time less than the Disbursed  Amount,  the Borrower  shall,  within five (5)
Business Days, either (a) furnish additional security to the Lender, in form and
amount  satisfactory  to the  Lender and  Eximbank,  or (b) pay to the Lender an
amount equal to the  difference  between the Disbursed  Amount and the Borrowing
Base.

     2.6 Continued  Security  Interest.  The Borrower shall notify the Lender in
writing  within five (5) Business  Days if (a) the Borrower  changes its name or
identity in any manner,  (b) the Borrower  changes the location of its principal
place of business,  (c) the nature of any of the Collateral is changed or any of
the  Collateral is  transferred  to another  location or (d) any of the books or
records  related to the Collateral  are  transferred  to another  location.  The
Borrower shall execute such additional  financing  statements or other documents
as the Lender may reasonably request in order to maintain its perfected security
interest in the Collateral.

     2.7 Inspection of Collateral. The Borrower shall permit the representatives
of the Lender and  Eximbank to make at any time  during  normal  business  hours
reasonable  inspections  of the  Collateral  and of the  Borrower's  facilities,
activities, and books and records, and shall cause its officers and employees to
give full cooperation and assistance in connection therewith.

     2.8 Notice of Debtor's  Relief,  Dissolution and  Litigation.  The Borrower
shall  notify  the  Lender  in  writing  within  five (5)  Business  Days of the
occurrence of any of the following:

     (a) a proceeding in  bankruptcy  or an action for debtor's  relief is filed
     by, against, or on behalf of the Borrower;

     (b) the Borrower fails to obtain the dismissal or termination within thirty
     (30) calendar days of the commencement of any proceeding or action referred
     to in (a) above;

     (c) the Borrower  begins any procedure for its  dissolution or liquidation,
     or a procedure therefore has been commenced against it; or

     (d) any material litigation is filed against the Borrower.

     2.9 Insurance. The Borrower shall maintain insurance coverage in the manner
and to the extent customary in businesses of similar character.

     2.10 Merger or Consolidation. Without the prior written consent of Eximbank
and the Lender,  the Borrower shall not (a) merge or consolidate  with any other
entity,  (b) sell, lease,  transfer or otherwise dispose of any substantial part
of its assets,  or any part of its assets which are  essential to the conduct of
its business or operations,  (c) make any material change in its  organizational
structure  or  identity,  or  (d)  enter  into  any  agreement  to do any of the
foregoing.

     2.11 Reborrowings and Repayment Terms.

     (a) If the Loan is a Revolving  Loan,  provided that the Borrower is not in
     default under any of the Loan Documents, the Borrower may borrow, repay and
     reborrow  amounts  under  the  Loan  until  the  close of  business  on the
     Availability  Date. Unless the Revolving Loan is renewed or extended by the
     Lender,  the Borrower shall pay in full the outstanding Loan Amount and all
     accrued and unpaid  interest  thereon no later than the first  Business Day
     after the Availability Date.

     (b) If the Loan is a Transaction  Specific Loan, the Borrower shall, within
     two (2)  Business  Days of the  receipt  thereof,  pay to the  Lender  (for
     application  against  the  outstanding  Loan  Amount and accrued and unpaid
     interest  thereon) all checks,  drafts,  cash and other  remittances it may
     receive in payment or on account of the  Accounts  Receivable  or any other
     Collateral,  in precisely the form received  (except for the endorsement of
     the Borrower where necessary). Pending such deposit, the Borrower shall not
     commingle  any  such  items  of  payment  with  any of its  other  funds or
     property, but will hold them separate and apart.

     2.12 Cross Default.  The Borrower shall be deemed in default under the Loan
if the Borrower fails to pay when due any amount payable to the Lender under any
loan to the Borrower not guaranteed by Eximbank.

     2.13 Financial  Statements.  The Borrower shall provide quarterly financial
statements  to the  Lender no later  than  fifty (50) days after the end of each
quarter.  This is in  addition  to any other  financial  statements  that may be
required by the Lender under the Loan Agreement.

     2.14 Taxes,  Judgments and Liens.  The Borrower shall remain current on all
of its federal, state and local tax obligations. In addition, the Borrower shall
notify  the  Lender  in the event  (i) any  judgment  is  rendered  against  the
Borrower, or (ii) any lien is filed against any of the assets of the Borrower.

     2.15 Munitions List. If any of the Items are articles, services, or related
technical data that are listed on the United States  Munitions List (part 121 of
title 22 of the Code of Federal Regulations),  the Borrower shall send a written
notice  promptly to the Lender  describing  the  Item(s)  and the  corresponding
invoice amount.

     2.16 Suspension and Debarment,  etc. On the date of this Agreement  neither
the Borrower nor its Principals (as defined below) are (A) debarred,  suspended,
proposed  for  debarment  with a final  determination  still  pending,  declared
ineligible or  voluntarily  excluded (as such terms are defined under any of the
Debarment  Regulations  referred to below) from  participating in procurement or
nonprocurement transactions with any United States federal government department
or agency pursuant to any of the Debarment Regulations (as defined below) or (B)
indicted, convicted or had a civil judgment rendered against the Borrower or any
of its  Principals  for  any  of the  offenses  listed  in any of the  Debarment
Regulations.  Unless  authorized  by Eximbank,  the Borrower  will not knowingly
enter into any  transactions in connection with the Items with any person who is
debarred,   suspended,   declared   ineligible  or  voluntarily   excluded  from
participation  in procurement  or  nonprocurement  transactions  with any United
States federal government  department or agency pursuant to any of the Debarment
Regulations. The Borrower will provide immediate written notice to the Lender if
at any time it learns that the  certification set forth in this Section 2.16 was
erroneous when made or has become erroneous by reason of changed  circumstances.
For the purposes  hereof,  (1)  "Principals"  shall mean any officer,  director,
owner,  partner,  key  employee,  or other  person with  primary  management  or
supervisory  responsibilities  with respect to the Borrower, or any other person
(whether  or not an  employee)  who has  critical  influence  on or  substantive
control over the  transaction  covered by this  Agreement  and (2) the Debarment
Regulations  shall  mean  (x)  the   Governmentwide   Debarment  and  Suspension
(Nonprocurement)  regulations  (Common Rule), 53 Fed. Reg. 19204 (May 26, 1988),
(y)  Subpart  9.4  (Debarment,  Suspension,  and  Ineligibility)  of the Federal
Acquisition   Regulations,   48   C.F.R.   9.400-9.409   and  (z)  the   revised
Governmentwide  Debarment and Suspension  (Nonprocurement)  regulations  (Common
Rule), 60 Fed. Reg. 33037 (June 26, 1995).

     2.17  Special  Conditions.  The  Borrower  shall  comply  with all  Special
Conditions,  if  any,  referenced  in  Section  (11) of the  Loan  Authorization
Agreement or the Loan Authorization Notice.




                                   ARTICLE III
                               RIGHTS AND REMEDIES

     3.1  Indemnification.  Upon Eximbank's  payment of a claim to the Lender in
connection with the Loan pursuant to the Master  Guarantee  Agreement,  Eximbank
shall assume all rights and remedies of the Lender under the Loan  Documents and
may enforce any such rights or remedies against the Borrower, the Collateral and
any  Guarantors.  Additionally,  the Borrower shall hold Eximbank and the Lender
harmless  from and  indemnify  them  against any and all  liabilities,  damages,
claims,  costs and losses  incurred or suffered by either of them resulting from
(a) any materially  incorrect  certification or statement  knowingly made by the
Borrower  or its agent to Eximbank  or the Lender in  connection  with the Loan,
this Agreement or any of the other Loan Documents or (b) any material  breach by
the Borrower of the terms and  conditions of this  Agreement or any of the other
Loan Documents. The Borrower also acknowledges that any statement, certification
or representation made by the Borrower in connection with the Loan is subject to
the penalties provided in Article 18 U.S.C. Section 1001.

                                   ARTICLE IV
                                  MISCELLANEOUS

     4.1 Governing  Law. This  Agreement  shall be governed by, and construed in
accordance with, the laws of the State of New York, United States of America.

     4.2  Notification.  All  notifications  required by this Agreement shall be
given in the manner provided in the Loan Agreement.

     4.3  Partial  Invalidity.  If at any  time  any of the  provisions  of this
Agreement becomes illegal, invalid or unenforceable in any respect under the law
of any jurisdiction,  neither the legality,  the validity nor the enforceability
of the remaining provisions hereof shall in any way be affected or impaired.


     IN WITNESS  WHEREOF,  the  Borrower  has caused this  Agreement  to be duly
executed as of the 20th day of June, 1996.



         CASTELLE


By:      /s/ Randall I. Bambrough


Name:    Randall I. Bambrough


Title:   Vice President of Finance



ACKNOWLEDGED:


         SILICON VALLEY BANK


By:      /s/ Peter A. Kidder


Name:    Peter Kidder


Title:   Vice President


Guaranteed Loan No.


ANNEXES:

Al - Loan Authorization Agreement or
A2 - Loan Authorization Notice



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