SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934
                                (Amendment No. )

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|_|      Soliciting Material under Rule 14a-12

                                    Castelle
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                (Name of Registrant as Specified In Its Charter)

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

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                                    CASTELLE
                           855 Jarvis Drive, Suite 100
                              Morgan Hill, CA 95037

                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
                         TO BE HELD ON NOVEMBER 7, 2001

TO THE SHAREHOLDERS OF CASTELLE:

         NOTICE IS HEREBY  GIVEN that the  Annual  Meeting  of  Shareholders  of
CASTELLE, a California  corporation (the "Company"),  will be held on Wednesday,
November  7, 2001 at 1:30 p.m.  local time at the  Company's  corporate  offices
located  at 855  Jarvis  Drive,  Suite  100,  Morgan  Hill,  California  for the
following purposes:

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

2.       To ratify the selection of  PricewaterhouseCoopers  LLP as  independent
         auditors of the Company for its fiscal year ending December 31, 2001.

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

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

         The Board of Directors has fixed the close of business on September 14,
2001,  as the record  date for the  determination  of  shareholders  entitled to
notice  of and to  vote  at  this  Annual  Meeting  and  at any  adjournment  or
postponement thereof.

                                 By Order of the Board of Directors


                                 /s/ Paul Cheng
                                 Paul Cheng
                                 Chief Financial Officer and Secretary

Morgan Hill, California
September 26, 2001

--------------------------------------------------------------------------------
         ALL SHAREHOLDERS ARE CORDIALLY INVITED TO ATTEND THE MEETING IN PERSON.
WHETHER OR NOT YOU EXPECT TO ATTEND THE MEETING, PLEASE COMPLETE, DATE, SIGN AND
RETURN THE  ENCLOSED  PROXY AS  PROMPTLY  AS  POSSIBLE  IN ORDER TO ENSURE  YOUR
REPRESENTATION  AT THE MEETING.  A RETURN  ENVELOPE (WHICH IS POSTAGE PREPAID IF
MAILED IN THE UNITED  STATES) IS  ENCLOSED  FOR THAT  PURPOSE.  EVEN IF YOU HAVE
GIVEN YOUR PROXY, YOU MAY STILL VOTE IN PERSON IF YOU ATTEND THE MEETING. PLEASE
NOTE, HOWEVER, THAT IF YOUR SHARES ARE HELD OF RECORD BY A BROKER, BANK OR OTHER
NOMINEE  AND YOU WISH TO VOTE AT THE  MEETING,  YOU MUST  OBTAIN FROM THE RECORD
HOLDER A PROXY ISSUED IN YOUR NAME.
--------------------------------------------------------------------------------


                                    CASTELLE
                           855 Jarvis Drive, Suite 100
                              Morgan Hill, CA 95037

                                 PROXY STATEMENT
                       FOR ANNUAL MEETING OF SHAREHOLDERS

                                NOVEMBER 7, 2001

                 INFORMATION CONCERNING SOLICITATION AND VOTING

GENERAL

         The enclosed  proxy is solicited on behalf of the Board of Directors of
CASTELLE,  a  California  corporation  (the  "Company"),  for use at the  Annual
Meeting of  Shareholder  to be held on November 7, 2001, at 1:30 p.m. local time
(the "Annual Meeting"),  or at any adjournment or postponement  thereof, for the
purposes set forth herein and in the accompanying Notice of Annual Meeting.  The
Annual Meeting will be held at the Company's  corporate offices,  located at 855
Jarvis Drive,  Suite 100, Morgan Hill,  California.  The Company intends to mail
this proxy statement and accompanying  proxy card on or about September 26, 2001
to all shareholders entitled to vote at the Annual Meeting.

SOLICITATION

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

VOTING RIGHTS AND OUTSTANDING SHARES

         Only  holders  of record of Common  Stock at the close of  business  on
September  14,  2001 will be  entitled  to  notice of and to vote at the  Annual
Meeting.  At the  close of  business  on  September  14,  2001, the Company  had
outstanding and entitled to vote 4,744,795 shares of Common Stock.

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

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

                                       1.


REVOCABILITY OF PROXIES

         Any person giving a proxy pursuant to this  solicitation  has the power
to revoke it at any time  before it is voted.  It may be revoked by filing  with
the Secretary of the Company at the Company's  principal  executive office,  855
Jarvis Drive,  Suite 100,  Morgan Hill,  California  95037,  a written notice of
revocation or a duly  executed  proxy bearing a later date, or it may be revoked
by attending  the meeting and voting in person.  Attendance  at the meeting will
not, by itself, revoke a proxy.

SHAREHOLDER PROPOSALS

         The Company  anticipates  that the  Company's  2002  Annual  Meeting of
Shareholders will be held on a date  significantly  earlier in the year than the
2001 Annual Meeting of Shareholders.  Although no date has yet been established,
the Company  expects the 2002 Annual Meeting to be held on or about May 15, 2002
and that proxy statements will be mailed on or about April 8, 2002. Accordingly,
the  deadline  for  submitting  a  shareholder  proposal  for  inclusion  in the
Company's  proxy  statement  and form of proxy  for the  Company's  2002  Annual
Meeting of  Shareholders  pursuant to Rule 14a-8 of the  Securities and Exchange
Commission  is December 10,  2001.  Unless a  shareholder  who wishes to bring a
matter  before  the  shareholders  at  the  Company's  2002  Annual  Meeting  of
Shareholders  notifies  the Company of such matter  prior to February  22, 2002,
management will have discretionary authority to vote all shares for which it has
proxies in opposition to such matter.

                                   PROPOSAL 1

                              ELECTION OF DIRECTORS

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

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

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

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

NOMINEES

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

                      NAME        AGE                  POSITION

         Donald L. Rich            59      Chairman of the Board, President,
                                           Chief Executive Officer and Director

         Peter R. Tierney          56      Director and President and Chief
                                           Executive Officer of
                                           MarketFirst Software Inc.

                                       2.


         Robert H. Hambrecht       34      Director and Managing Director of
                                           Equity Capital Markets, W.R.
                                           Hambrecht & Company

         Scott C. McDonald         47      Director

         Jack Howard               39      Director and principal,
                                           Mutual Securities, Inc.

         Set forth below is biographical information for each nominee whose term
of office as a director will continue after the Annual Meeting.

ROBERT H. HAMBRECHT

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

DONALD L. RICH

         Mr. Rich  joined the  Company in November  1998 and has served as Chief
Executive  Officer and President  from  November  1998 to the present.  Mr. Rich
became Chairman of the Board in May 1999. Mr. Rich has served as Chief Financial
Officer from April 1999 to March 2001 and Secretary  from February 2000 to March
2001.  From January 1997 until November 1998,  Mr. Rich was  self-employed  as a
consultant.  From 1993 through 1997,  Mr. Rich was Chief  Executive  Officer and
President  of  Talarian  Corporation,  a provider  of  real-time  infrastructure
software for the  enterprise  and the  Internet.  Prior to that, he held various
sales and  marketing  management  positions  at  Integrated  Systems,  Inc.  and
International  Business  Machines  Corporation.  Mr.  Rich  holds a BS degree in
Mechanical  Engineering  from  Purdue  University  and an MBA from the  Stanford
Graduate School of Business.

PETER R. TIERNEY

         Mr.  Tierney has served as a director of the Company  since April 1999.
He has served as President and Chief Executive  Officer of MarketFirst  Software
Inc., a privately held business  focused on delivering  software and services in
the  emerging  field of  marketing  automation  systems  since July  1998.  Most
recently, Mr. Tierney served as a consultant to Siebel Systems Corporation. From
1991 to 1997,  Mr.  Tierney  served as Chairman,  President and CEO of Inference
Corporation,  a leading provider of self-service and knowledge  management tools
for the customer service and help desk industries. Prior to Inference, as senior
vice  president of Oracle  Corporation  Tierney was  responsible  for  worldwide
marketing and served as a member of the Oracle Management Committee.  Earlier in
his career,  Mr.  Tierney  served as vice  president of marketing  and sales for
Relational Technology (Ingres) Corporation and was director of marketing for the
IBM  Northwestern  Region.  Mr.  Tierney also  currently  serves on the Board of
Directors of MarketFirst Software and The SoftAd Group.

SCOTT C. MCDONALD

         Mr.  McDonald has served as a director of the Company since April 1999.
From December 1999 to April 2001, Mr. McDonald has served as the Chief Financial
and  Administrative  Officer at Conxion  Corporation,  an  Internet  network and
intellectual  property  services company  providing  solutions for e-businesses.
From 1993 to 1997, Mr. McDonald was the senior operating and financial executive
at CIDCO, an innovator in advanced telephony products, serving as Executive Vice
President,  Chief Operating Officer, Chief Financial Officer and Secretary. From
1989 to 1993,  Mr.  McDonald  was Chief  Financial  Officer and Vice  President,
Finance &  Administration  at Integrated  Systems,  Inc., a provider of embedded
operating software and design automation tools. Prior to 1989, Mr. McDonald held
financial  management and investor  relations  positions with Computer Products,
Inc., Compower  Corporation,

                                       3.


Monterey  Federal  Credit  Union  and the J.M.  Smucker  Company.  Mr.  McDonald
currently  serves on the Board of Directors  for Digital Power  Corporation  and
Octant Technologies Inc.

JACK HOWARD

         Jack Howard has served as a director of Castelle  since  January  2001.
Since  1994,  Mr.  Howard has been a Principal  of Mutual  Securities,  Inc.,  a
registered  broker-dealer.  Mr. Howard has served as a director of  WebFinancial
Corporation,  a commercial and consumer lender, since 1996 and as Vice President
of  WebFinancial  Corporation  since  December  1997.  Mr.  Howard  has been the
President of Gateway  Industries,  Inc., a provider of database  development and
website design and  development  services,  since  September 1994. Mr. Howard is
also a director of the following publicly held companies:  Pubco Corporation,  a
printing supplies and construction equipment  manufacturer and distributor,  and
US Diagnostic Inc., an operator of outpatient diagnostic imaging.

BOARD COMMITTEES AND MEETINGS

         During the fiscal year ended  December 31, 2000, the Board of Directors
held four meetings and acted by unanimous  written  consent one time.  The Board
has an Audit Committee and a Compensation Committee.

         The Audit  Committee meets with the Company's  independent  auditors at
least  annually  to review  the  results  of the annual  audit and  discuss  the
financial  statements,  recommends to the Board the  independent  auditors to be
retained,  oversees the independence of the independent auditors,  evaluates the
independent  auditors'  performance  and receives and considers the  independent
auditors' comments as to controls,  adequacy of staff and management performance
and procedures in connection  with audit and financial  controls.  During fiscal
2000, the Audit Committee was composed of two  non-employee  directors:  Messrs.
McDonald and Mr. Hambrecht.  Mr. Howard was elected to the Committee in February
2001. It met once during such fiscal year.  All members of the  Company's  Audit
Committee are independent (as independence is defined in Rule 4200(a)(14) of the
NASD listing standards).

         The Compensation  Committee makes  recommendations  concerning salaries
and incentive  compensation,  awards stock options to employees and  consultants
under the  Company's  stock option plans and otherwise  determines  compensation
levels and performs such other functions regarding compensation as the Board may
delegate.  The  Compensation  Committee  is composed  of two outside  directors:
Messrs.  Hambrecht and Tierney. It met once during such fiscal year and acted by
unanimous written consent one time.

         During the fiscal  year ended  December  31,  2000,  each Board  member
attended  75% or more of the  aggregate  of the meetings of the Board and of the
committees  on which he  served,  held  during  the  period  for  which he was a
director or committee member, respectively.

             REPORT OF THE AUDIT COMMITTEE OF THE BOARD OF DIRECTORS

         The Audit Committee has the  responsibility,  under delegated authority
from the Board of Directors,  for providing independent,  objective oversight of
the  Company's  corporate  accounting  and  reporting  practices  as well as the
quality and integrity of the Company's  financial  statements  and reports.  The
Audit  Committee is composed of three  non-employee  directors  and acts under a
written  charter  adopted and approved by the Board of Directors.  A copy of the
Audit Committee Charter is attached to this Proxy Statement as Appendix A.

         Management is responsible for the Company's  internal  controls and the
financial  reporting  process.  The independent  accountants are responsible for
performing  an  independent  audit  of the  Company's  financial  statements  in
accordance  with  generally  accepted  auditing  standards and to issue a report
thereon.  The Audit  Committee's  responsibility is to monitor and oversee these
processes.

         In this context,  the Audit Committee has met and held discussions with
management and the independent accountants.  Management represented to the Audit
Committee that the Company's  consolidated financial statements were prepared in
accordance  with  generally  accepted  accounting

                                       4.


principles,  and the Audit  Committee  has reviewed and  discussed the Company's
consolidated  financial  statements  for the fiscal year ended December 31, 2000
with  management  and  the  independent  accountants.  In  addition,  the  Audit
Committee has discussed with the independent auditors the matters required to be
discussed by the  Statement on Auditing  Standards  No. 61,  Communication  with
Audit Committees,  as amended, has received and reviewed the written disclosures
and the letter from the independent public accountants  required by Independence
Standard No. 1., Independence Discussions with Audit Committees, as amended, and
has discussed with the independent auditors their independence.

         Based on the  reviews  and  discussions  referred  to above,  the Audit
Committee  recommended to the Board of Directors  that the financial  statements
referred to above be included in the Company's  Annual Report on Form 10-K/A for
the year ended  December  31,  2000,  filed  with the  Securities  and  Exchange
Commission.

                                      Audit Committee of the Board of Directors

                                      ROBERT H. HAMBRECHT
                                      SCOTT C. MCDONALD
                                      JACK HOWARD

                                       5.


                                   PROPOSAL 2

                RATIFICATION OF SELECTION OF INDEPENDENT AUDITORS

         The Board of Directors has selected  PricewaterhouseCoopers  LLP as the
Company's  independent auditors for the fiscal year ending December 31, 2001 and
has  further  directed  that  management  submit the  selection  of  independent
auditors  for   ratification   by  the   shareholders  at  the  Annual  Meeting.
PricewaterhouseCoopers  LLP has audited the Company's financial statements since
its  inception  in  1987.  Representatives  of  PricewaterhouseCoopers  LLP  are
expected to be present at the Annual Meeting, will have an opportunity to make a
statement  if they so desire and will be  available  to  respond to  appropriate
questions.

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

         The affirmative vote of the holders of a majority of the shares present
in person or represented by proxy and voting at the Annual Meeting (which shares
voting affirmatively also constitute at least a majority of the required quorum)
will be required to ratify the  selection  of  PricewaterhouseCoopers  LLP.  For
purposes of this vote  abstentions and broker  non-votes will not be counted for
any purpose in determining whether this matter has been approved.

         AUDIT  FEES.  During  the fiscal  year ended  December  31,  2000,  the
aggregate fees for the audit of the Company's  financial  statements and for the
review  of the  Company's  interim  financial  statements  on Form 10-Q for such
fiscal  year was  $108,550,  of which an  aggregate  of $43,750  had been billed
through December 31, 2000.

         FINANCIAL  INFORMATION  SYSTEMS DESIGN AND IMPLEMENTATION  FEES. During
the fiscal year ended  December  31, 2000,  there were no financial  information
systems design or implementation fees billed by PricewaterhouseCoopers LLP.

         ALL OTHER FEES.  During fiscal year ended December 31, 2000, there were
no other professional service fees billed by PricewaterhouseCoopers LLP.

         The Audit  Committee has determined  the rendering all other  non-audit
services  by  PricewaterhouseCoopers  LLP is  compatible  with  maintaining  the
auditor's independence.

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

                                       6.


                              SECURITY OWNERSHIP OF

                    CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

         The  following  table  sets forth  certain  information  regarding  the
ownership  of the  Company's  Common  Stock as of August  20,  2001 by: (i) each
director and nominee for director;  (ii) each of the executive officers named in
the Summary  Compensation  Table;  (iii) all executive officers and directors of
the Company as a group; and (iv) all those known by the Company to be beneficial
owners of more than five percent of its Common Stock.

                                                        BENEFICIAL  OWNERSHIP(1)
                                                         NUMBER OF   PERCENT OF
                          BENEFICIAL OWNER                SHARES       TOTAL
Entities Affiliated with:                                581,626       12.3%
     Chase Manhattan Corporation (2)
     One Bush Street
     18th Floor
     San Francisco, CA 94104

Tolvusamskipti HF                                        439,560        9.3%
     Kringlunni 19
     103 Reykjavik, Iceland

Eric Chen (3)                                             60,307        1.3%
Paul Cheng (3)                                            16,874           *
Boris Elpiner (3)                                         52,868        1.1%
Robert Hambrecht (3)                                      25,709           *
Ed Heinze (3)                                             29,582           *
Jack Howard (4)                                          257,248        5.4%
Scott McDonald (3)                                        19,998           *
Michael Petrovich (3)                                     84,582        1.8%
Donald L. Rich (3)                                       491,684        9.4%
Peter Tierney (3)                                         19,998           *
All officers and directors as a group(10 persons)(5)   1,058,850       19.1%

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

*        Less than one percent.

(1)      This table is based upon  information  supplied by officers,  directors
         and  principal  shareholders  and  Schedules 13D and 13G filed with the
         Securities  and  Exchange  Commission  (the  "SEC").  Unless  otherwise
         indicated  in the  footnotes  to this table and  subject  to  community
         property laws where  applicable,  the Company believes that each of the
         shareholders  named in this table has sole voting and investment  power
         with respect to the shares indicated as beneficially owned.  Applicable
         percentages  are based on 4,744,795  shares  outstanding  on August 20,
         2001, adjusted as required by rules promulgated by the SEC.

(2)      Includes 346,849 shares held by H&Q London Ventures, 60,835 shares held
         by H&Q Ventures IV, 1,250 shares held by Hamquist,  43,633  shares held
         by  Hambrecht  & Quist  Venture  Partners  and  129,059  shares held by
         Hambrecht  &  Quist  California.  The  entities  named  above  and  the
         entities' respective general partners,  directors,  executive officers,
         members and/or managers,  as applicable,  disclaim beneficial ownership
         of any securities other than those directly held by such person.

(3)      Includes shares of Common Stock subject to options  exercisable  within
         60 days of August 20, 2001 as follows:  55,307 for Mr. Chen, 16,874 for
         Mr. Cheng, 51,744 for Mr. Elpiner, 19,789 for

                                       7.


         Mr. Hambrecht,  27,082 for Mr. Heinze, 19,998 for Mr. McDonald,  79,582
         for Mr. Petrovich, 491,684 for Mr. Rich and 19,998 for Mr. Tierney.

(4)      The shares listed are held jointly by Mr.  Howard and his wife,  Kathy.
         Mr. and Mrs.  Howard,  each  acting  alone,  have the power to vote and
         dispose of such  shares.  Also  includes  3,333  shares of Common Stock
         subject to options held in Mr. Howard's name solely  exercisable within
         60 days of August 20, 2001.

(5)      Includes the information reflected in the notes above, as applicable.

SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

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

         To the Company's  knowledge,  based solely on a review of the copies of
such reports furnished to the Company and written  representations that no other
reports were  required,  during the fiscal year ended  December  31,  2000,  all
Section  16(a)  filing  requirements   applicable  to  the  Company's  officers,
directors and greater than ten percent beneficial owners were complied with.

                             EXECUTIVE COMPENSATION

COMPENSATION OF DIRECTORS

         Members of the Company's Board of Directors  currently  receive no cash
compensation  from the Company for their services as members of the Board.  They
are, however,  reimbursed for certain expenses incurred in connection with their
attendance at meetings of the board of directors and committee meetings thereof.

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

         Option grants under the  Directors'  Plan are  non-discretionary.  Upon
initial  election  to the  Company's  board  of  directors,  and  provided  such
individual is not an employee,  a person is granted an option to purchase 10,000
shares of Common Stock of the Company. Under the terms of the Directors' Plan as
presently  in effect,  on April 1 of each year (or the next  business day should
such date be a legal  holiday),  each member of the Company's Board eligible for
participation in the Directors' Plan, without further action by the Company, the
Board or the shareholders of the Company, is automatically  granted an option to
purchase  10,000  shares of Common Stock of the Company.  The exercise  price of
options  granted under the  Directors'  Plan is 100% of the fair market value of
the Common Stock subject to the option on the date of the option grant.  Options
granted  to  members  of the board  under the  Directors'  Plan vest in 24 equal
installments,  beginning  one month  after the date of grant  provided  that the
optionee has, during the entire period prior to such vesting date,  continuously
served as a non-employee  director of the Company.  The term of options  granted
under the Directors'  Plan is ten years. In the event of a merger of the Company
with or into another  corporation or a  consolidation,  acquisition of assets or
other   change-in-control   transaction   involving  the  Company,   vesting  is
accelerated  under the  Directors'  Plan and the option  will  terminate  if not
exercised prior to the consummation of the transaction.

         During the last fiscal  year,  the  Company  granted  options  covering
10,000  shares to each of Messrs.  Hambrecht,  Tierney and  McDonald at exercise
prices of $1.9375 per share.  The exercise  prices were equal to the  respective
fair  market  values of such Common  Stock on the date of grant  (based upon the
closing  sale  price  reported  on the  Nasdaq  SmallCap  Market for the date of
grant).  As of  August  20,  2001,  no  options  had been  exercised  under  the
Directors' Plan.

                                       8.


COMPENSATION OF EXECUTIVE OFFICERS

SUMMARY OF COMPENSATION

         The following table shows for the fiscal years ended December 31, 2000,
1999 and 1998,  compensation  awarded or paid to, or earned  by,  the  Company's
Chief Executive Officer, Chief Financial Officer, and its four other most highly
compensated  executive  officers at December 31, 2000 whose total annual  salary
and bonus exceeded $100,000 (the "Named Executive Officers"):

                           SUMMARY COMPENSATION TABLE



                                                                                                LONG-TERM
                                                                                              COMPENSATION
                                                                                               ------------
                                                          ANNUAL COMPENSATION                    AWARDS
                                                          -------------------                    ------

NAME AND PRINCIPAL                FISCAL    SALARY ($)      BONUS ($)(2)      OTHER($)         SECURITIES
  POSITION(1)                      YEAR     ----------      ------------      --------         UNDERLYING
  -----------                      ----                                                        OPTIONS (#)
                                                                                               -----------

                                                                                 
Donald L. Rich                      2000    $200,100       $ 94,020             --              --
President, Chairman of the          1999    $200,000       $100,000             --              200,000
Board, Chief Executive Officer      1998    $ 22,307       $0                   --              300,000
And Director

Eric Chen                           2000    $137,965       $ 42,484             --               30,000
Vice President, Engineering         1999    $120,500       $ 30,000             --               20,000
                                    1998    $117,904       $  2,154             --               0

Paul Cheng                          2000    $ 97,191       $ 26,320             --               45,000
Chief Financial Officer and         1999    --             --                   --               --
Secretary                           1998    --             --                   --               --

Boris Elpiner                       2000    $135,100       $ 39,797             --               --
Vice President, Marketing           1999    $ 90,865       $ 18,637             --               78,000
                                    1998    --              --                  --               --

Edward J. Heinze                    2000    $ 91,139       $0                   $ 44,224         15,000
Vice President, Sales,              1999    $ 79,704       $  5,253             $ 25,092         35,000
Americas                            1998    $ 67,800       $0                   $ 24,809          5,000

Michael Petrovich                   2000    $103,102       $0                   $ 77,881(3)      --
Vice President, International       1999    $124,499       $0                   $125,314         30,000
Sales                               1998    $135,000       $0                   $148,271         10,000

<FN>
(1)      Mr. Rich joined the Company as President and Chief Executive Officer in
         November  1998. Mr. Cheng joined the Company in March 2000. Mr. Elpiner
         joined the Company in April 1999.

(2)      Includes bonus amounts of $94,020, $14,380, $11,259, $10,949 and $8,726
         for Messrs.  Rich, Cheng, Chen, Elpiner and Heinze,  respectively,  for
         services  rendered  in 2000 but paid in  February  through  April 2001.
         Includes bonus amounts of $100,000, $7,500, $5,348, $10,000 for Messrs.
         Rich, Chen, Petrovich, and Elpiner, respectively, for services rendered
         in 1999 but paid in 2000. A portion of the bonus  reflected for Messrs.
         Chen,  Heinze and Petrovich in 1999 includes amounts earned in 1998 but
         paid in 1999.

(3)      Includes a $3,520  commission  earned for services rendered in 2000 but
         paid in 2001.
</FN>

                                       9.


STOCK OPTION GRANTS AND EXERCISES

         The Company  grants  options to its executive  officers  under its 1988
Equity  Incentive Plan. As of December 31, 2000,  options to purchase a total of
1,189,980  shares  were  outstanding  under the 1988 Equity  Incentive  Plan and
options to purchase 309,341 shares remained available for grant thereunder.  The
information  regarding stock options  granted to named  executive  officers as a
percentage of total options  granted to employees in 2000 is based on options to
purchase a total of 255,500 shares granted to employees and consultants in 2000,
under the 1988  Equity  Incentive  Plan.  There were no stock  option  exercises
during 2000 by any Named Executive Officer.  The Company did not grant any stock
appreciation  rights,  restricted  stock awards or stock purchase  rights during
2000.

         The following  tables show for the fiscal year ended December 31, 2000,
certain  information  regarding  options  granted to,  exercised by, and held at
year-end by the Named Executive Officers:

                        OPTION GRANTS IN LAST FISCAL YEAR



                                                     INDIVIDUAL GRANTS                          POTENTIAL REALIZABLE VALUE AT
                             ---------------------------------------------------------------       ASSUMED ANNUAL RATES OF
                              NUMBER OF      PERCENTAGE OF                                                   STOCK
                              SECURITIES     TOTAL OPTIONS                                            PRICE APPRECIATION
                              UNDERLYING       GRANTED TO                                            FOR OPTION TERM (4)
                               OPTIONS       EMPLOYEES IN       EXERCISE OR                          -------------------
                              GRANTED(#)     FISCAL YEAR(%)   BASE PRICE PER     EXPIRATION
   NAME                          (1)              (2)          SHARE ($) (3)        DATE         5% ($)           10% ($)
  ------                         ---              ---          -------------        ----         ------           -------
                                                                                                
Donald L. Rich                       0               -                  -                -             -                -

Eric Chen                       30,000           11.74%           $1.2812         05/10/07       $15,647          $36,465

Paul Cheng                      45,000           17.61%           $1.1582         04/19/07       $21,218          $49,446

Boris Elpiner                        0               -                  -            -                 -                -

Edward J. Heinze                15,000            5.87%            $0.875         11/08/07        $5,343          $12,452

Michael Petrovich                    0               -                  -            -                 -                -

<FN>
(1)      One-fourth of the options  granted to Mr. Cheng vest on April 19, 2001,
         and the  remaining  options vest monthly in equal  installments  over a
         36-month  period.  One-fourth of the options granted to Mr. Heinze vest
         on November 8, 2001,  and the  remaining  options vest monthly in equal
         increments over a 36-month period. One-fourth of the options granted to
         Mr. Chen vest on May 10, 2001,  and the remaining  options vest monthly
         in equal increments over a 36-month period.

(2)      Based on an  aggregate  of 255,500  shares of Common  Stock  subject to
         options granted to employees in 2000.

(3)      The exercise  price is equal to 100% of the fair market value of Common
         Stock at the date of grant.

(4)      The potential  realizable  value is calculated based on the term of the
         option at its date of grant.  It is calculated  based on the assumption
         that the stock price on the date of grant  appreciates from the date of
         grant at the indicated  annual rate compounded  annually for the entire
         term of the  option and that the  option is  exercised  and sold on the
         last day of its term for the  appreciated  stock price.  The 5% and 10%
         assumed  rates  of  appreciation  are  derived  from  the  rules of the
         Commission and do not represent the Company's estimate or projection of
         future Common Stock prices.
</FN>

                                      10.


       AGGREGATE OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR-END
                                  OPTION VALUES

         The  following  table sets  forth the number of shares of common  stock
subject to exercisable and  unexercisable  stock options held as of December 31,
2000 by each of the Named Executive Officers.



                                                                       NUMBER OF SECURITIES              VALUE OF UNEXERCISED
                                                                     UNDERLYING UNEXERCISED             IN-THE-MONEY OPTIONS
                                SHARES                                OPTIONS AT FY-END (#)                AT FY-END ($)(2)
                               ACQUIRED              VALUE            ---------------------                ----------------
                            ON EXERCISE (#)(1)    REALIZED ($)    EXERCISABLE      UNEXERCISABLE      EXERCISABLE    UNEXERCISABLE
                            ------------------    ------------    -----------      -------------      -----------    -------------
                                                                                                       
Donald Rich............                -                 -           408,344           91,656            $50,522         $5,729

Eric Chen..............                -                 -            36,727           47,023                  0              0

Paul Cheng.............                -                 -                 0           45,000                  0              0

Boris Elpiner..........                -                 -            37,163           40,837             $1,948         $1,327

Edward Heinze..........                -                 -            21,249           41,251                  0         $2,629

Michael Petrovich......                -                 -            68,540           26,460                  0              0

<FN>
--------------------

(1)      No options were exercised by any of the Named Executive Officers during
         fiscal 2000, and accordingly no values are shown.

(2)      Value of  unexercised  options at fiscal  year-end is based on the fair
         market  value of the  Company's  Common  Stock at December  31, 2000 of
         $1.0625  (based  on the  closing  sale  price  reported  on the  Nasdaq
         SmallCap Market on that date) minus the exercise price of the option.
</FN>

                                      11.


              EMPLOYMENT SEVERANCE AND CHANGE OF CONTROL AGREEMENTS

         In November 1998, the Company entered into an employment agreement with
Donald Rich,  pursuant to which Mr. Rich agreed to serve as our Chief  Executive
Officer.  The employment agreement is not for a specified term and is terminable
at will or  without  cause at any  time  upon  written  notice,  subject  to the
conveyance  of certain  severance  benefits  to Mr.  Rich upon  termination,  as
described below.  Mr. Rich's  employment  agreement  provides for an annual base
salary of $200,000,  plus an annual bonus of up to a sum of $100,000, if certain
performance criteria are met, or above $100,000, if such performance criteria is
exceeded  in the  discretion  of the  Compensation  Committee.  Pursuant  to his
employment agreement, Mr. Rich was also granted an initial incentive stock award
to purchase 300,000 shares of the Company's stock, subject to a vesting schedule
set forth in his employment agreement.

         The Company has also entered into a severance  and  transition  benefit
agreement  with Mr. Rich  pursuant to which the Company will pay Mr. Rich a lump
sum equal to 100% of his  annualized  salary and maintain  the medical  benefits
conveyed to him for one year, plus provide for the  accelerated  vesting of 100%
of his  outstanding  options to purchase  shares of the Company's  Common Stock,
following  either a voluntary  termination  of employment for good reason by Mr.
Rich or an involuntary  termination of employment without cause (each as defined
in his  agreement).  In  addition,  Mr. Rich is eligible  for a lump sum payment
equal to six months of his base  salary if he remains  with the Company at least
ninety  days  after a change  in  control  and his  employment  is  subsequently
terminated for any reason;  provided  further that Mr. Rich shall receive such a
lump sum payment if he should  remain with the Company for at least  ninety days
following  such a change in  control in  addition  to any  benefits  that may be
conveyed to Mr. Rich upon termination.

              [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                      12.


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

         The Company's  executive  compensation  program is  administered by the
Compensation  Committee  of the  Board of  Directors.  The  Committee  currently
consists of Robert  Hambrecht and Peter Tierney,  neither of whom is an employee
of the  Company.  The  Committee is  responsible  for  determining  compensation
policies for the Company's executive officers,  including any stock-based awards
to  such  individuals  under  the  Company's  1988  Equity  Incentive  Plan.  In
determining executive officer compensation, the Compensation Committee considers
corporate performance against the Company's objectives.

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

         For fiscal 2000, the Company's executive  compensation program included
the following  components:  (i) base salary,  (ii) options to purchase shares of
Common Stock of the Company,  and (iii) quarterly incentives in the form of cash
bonuses.

STOCK OPTIONS

         In addressing the first objective,  the Compensation Committee utilizes
stock  option  grants to  executive  officers to tie portion  executive  officer
compensation directly to the Company's stock price performance. The Compensation
Committee believes that the grant of an equity interest in the Company serves to
link management  interests with shareholder  interests and to motivate executive
officers to make decisions that are in the best interests of the Company and the
shareholders.  The Board  considers  stock option  grants to executive  officers
based on various factors,  including (i) each officer's  responsibilities,  (ii)
any  changes  in such  responsibilities,  (iii)  past  option  grants  and  each
officer's  current  equity  interest in the Company  and (iv)  performance.  The
Company's executive officers received options to purchase Common Stock at levels
ranging from zero to 45,000 shares.

BASE SALARY AND CASH BONUSES

         The second objective of the overall  executive  compensation  policy is
addressed by a salary and bonus policy  which is based on (i)  consideration  of
the salaries and total  compensation of executive  officers in similar positions
with comparable companies in the industry (ii) the qualifications and experience
of each executive officer,  (iii) the Company's financial performance during the
past year and (iv) each  officer's  performance  against  objectives  related to
their areas of responsibility.  The Compensation  Committee periodically reviews
individual base salaries of executive  officers,  and adjusts  salaries based on
individual   job   performance   and  changes  in  the   officer's   duties  and
responsibilities. In making salary decisions, the Board exercises its discretion
and judgment based on these factors. No specific formula is applied to determine
the weight of each factor,  although the mix among the compensation  elements of
salary,  cash  incentive  and stock  options are biased  toward stock options to
emphasize the link between executive  incentives and the creation of shareholder
value  as  measured  by the  equity  markets.  Consequently,  salaries  and cash
incentives  may be in the low-range as compared to the  comparable  companies in
the industry  while stock  options may be in the mid to  high-range  compared to
comparable  companies.  The Chief  Executive  Officer  provides  the Board  with
recommendations  for individual  executive  officers based upon an evaluation of
their performance  against  objectives and  responsibilities.  The base salaries
paid to the  Company's  executive  officers  were  increased  in 2000 by amounts
ranging zero to 25%,  reflecting  primarily changed  responsibilities  and their
contributions to the Company's short- and long-term strategic objectives.

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

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

                                      13.


         The  Compensation  Committee  believes  that  another  key  element  of
executive compensation should be the variable portion provided by cash incentive
plans.  The cash incentive  portion of the executive  officers'  compensation is
dependent  primarily  on  the  Company's  quarterly  financial  performance  and
achievement of specified corporate  objectives as determined by the Compensation
Committee.  The Company's  executive officer  compensation plan is designed such
that if the Company meets its stated objectives,  executive officers receive the
cash incentive  part of their  compensation.  If the Company  performs below its
stated objectives, the cash incentive portion of the executive's compensation is
significantly  reduced, and may be eliminated altogether if performance is below
defined  thresholds.   A  substantially  smaller  portion  of  some  executives'
incentive compensation is based on performance against individual objectives. At
the  beginning  of fiscal  2000,  the  Compensation  Committee  and the Board of
Directors  reviewed  and  approved  quarterly  performance  objectives  for  the
Company.  The actual cash bonus  earned in 2000 by executive  officers  depended
upon the extent to which the Company's objectives were achieved.  As a result of
the  Company  obtaining  a  certain  percentage  of such  quarterly  performance
objectives,  cash bonuses ranging from $21,000 to $37,000 were paid to executive
officers during fiscal 2000.

         The Board  uses the same  factors  described  above  for the  executive
officers in setting the annual  salary,  stock option grant and cash  incentives
awarded to its Chief Executive Officer, Donald Rich. The base salary of Mr. Rich
was not increased during fiscal 2000 and thus remained at $200,000 per year. Mr.
Rich was  eligible to earn a quarterly  bonus of up to a maximum of $25,000,  if
the Company achieved certain performance  objectives outlined for Mr. Rich prior
to the  beginning  of each  quarter of fiscal  2000.  As a result of the Company
obtaining a certain percentage of each quarterly  financial target, Mr. Rich was
awarded  a cash  bonus of  $94,020  in fiscal  2000.  Because  of the  amount of
previous  option  grants to Mr.  Rich,  the  Board  did not  award Mr.  Rich any
additional option grants during fiscal 2000.

SECTION 162(M)

         Section  162(m) of the Internal  Revenue Code (the  "Code"),  generally
imposes on the Company an annual corporate deduction limitation of $1 million on
the  compensation of certain  executive  officers.  Compensation in excess of $1
million  may be  deducted  if it is  performance-based  compensation  within the
meaning of the Code.  The Committee has not yet adopted a policy with respect to
the treatment of all forms of compensation  under Section 162(m);  however,  the
Committee has  determined  that stock options  granted under the Company's  1988
Equity  Incentive  Plan with an exercise price at least equal to the fair market
value  of the  Company's  Common  Stock  on the  date  of  grant  should,  where
practicable, be treated as "performance-based compensation," and the 1988 Equity
Incentive Plan contains provisions designed to allow compensation  recognized by
an executive officer as a result of the grant of a stock option to be deductible
by the Company.

                                            2000 COMPENSATION COMMITTEE

                                            ROBERT H. HAMBRECHT
                                            PETER R. TIERNEY

                                      14.


COMPENSATION COMMITTEE INTERLOCKS

         Mr. Hambrecht, a member of the Company's Compensation  Committee,  is a
partner of W.R.  Hambrecht & Co. ("WRH & Co."), an investment banking firm which
the Company engaged in January 2001 to provide certain advisory  services to the
Company.  As of April 2001,  WRH & Co. had  rendered an  insignificant  level of
services to the Company under this arrangement.  See "Certain  Relationships and
Related Transactions-Advisory  Relationship with W.R. Hambrecht & Co." set forth
herein.

                      PERFORMANCE MEASUREMENT COMPARISON(2)

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

[The following  descriptive  data is supplied in accordance  with Rule 304(d) of
Regulation S-T]

          COMPARISON OF FIVE YEAR CUMULATIVE TOTAL RETURN ON INVESTMENT

                               12/95  12/96    12/97    12/98    12/99   12/00

Castelle                       $100  $74.19   $27.42   $12.90   $24.19   $13.72

Nasdaq Stock Market (U.S.)     $100  $123.03  $150.68  $212.47  $394.84  $237.36

Nasdsaq Computer Manufacturer  $100  $133.89  $161.79  $351.89  $746.28  $420.46

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

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

                                      15.


                              CERTAIN TRANSACTIONS

         In January  2001,  the Company  engaged  W.R.  Hambrecht & Co.  ("WRH &
Co."), an investment bank in which Mr. Hambrecht,  a director of the Company, is
a partner,  to provide certain financial advisory services to the Company. As of
August 2001,  WRH & Co. had rendered an  insignificant  level of services to the
Company under this arrangement.

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

                                  OTHER MATTERS

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

                                 By Order of the Board of Directors

                                 /s/ Paul Cheng
                                 Paul Cheng
                                 Chief Financial Officer and Secretary

September 26, 2001


A COPY OF THE COMPANY'S ANNUAL REPORT TO THE SECURITIES AND EXCHANGE  COMMISSION
ON FORM 10-K/A FOR THE FISCAL YEAR ENDED DECEMBER 31, 2000 IS AVAILABLE  WITHOUT
CHARGE UPON WRITTEN REQUEST TO: CORPORATE SECRETARY, CASTELLE, 855 JARVIS DRIVE,
SUITE 100, MORGAN HILL, CA 95037

                                      16.


APPENDIX A

                         CHARTER OF THE AUDIT COMMITTEE
PURPOSE AND POLICY

         The Audit Committee shall provide  assistance and guidance to the Board
of Directors of the Company in fulfilling its oversight  responsibilities to the
Company's  shareholders with respect to the Company's  corporate  accounting and
reporting  practices  as well as the  quality  and  integrity  of the  Company's
financial  statements  and  reports.  The  policy  of the  Audit  Committee,  in
discharging these obligations, shall be to maintain and foster an open avenue of
communication  between the Audit  Committee and the  independent  auditors,  the
Company's financial management and internal auditors.

COMPOSITION AND ORGANIZATION

         No later than June 14, 2001,  the Audit  Committee  shall consist of at
least  three  members  of the  Board of  Directors.  The  members  of the  Audit
Committee  shall satisfy the  independence  and experience  requirements  of the
Nasdaq National Market.

         The Audit Committee shall hold such regular or special  meetings as its
members  shall deem  necessary  or  appropriate.  Minutes of each meeting of the
Audit  Committee  shall be  prepared  and  distributed  to each  director of the
Company promptly after each meeting.  The operation of the Audit Committee shall
be  subject  to the  Bylaws of the  Company  as in effect  from time to time and
Section 307 of the California General Corporation Law.

RESPONSIBILITIES

         In fulfilling its  responsibilities,  the Audit Committee believes that
its functions and procedures should remain flexible in order to address changing
conditions most effectively. To implement the policy of the Audit Committee, the
Committee shall be charged with the following functions:

         1.  To  recommend  annually  to the  Board  of  Directors  the  firm of
certified  public  accountants to be employed by the Company as its  independent
auditors for the ensuing year, which firm is ultimately accountable to the Audit
Committee and the Board, as representatives of the Company's shareholders.

         2. To review the engagement of the independent auditors,  including the
scope,  extent  and  procedures  of the  audit and the  compensation  to be paid
therefor, and all other matters the Audit Committee deems appropriate.

         3. To  evaluate,  together  with  the  Board,  the  performance  of the
independent auditors and, if so determined by the Audit Committee,  to recommend
that the Board replace the independent auditors.

         4.  To  receive  written  statements  from  the  independent   auditors
delineating all  relationships  between the auditors and the Company  consistent
with  Independence  Standards Board Standard No. 1, to consider and discuss with
the  auditors  any  disclosed  relationships  or services  that could affect the
auditors'  objectivity  and  independence  and  otherwise  to  take,  and  if so
determined by the Audit Committee, to recommend that the Board take, appropriate
action to oversee the independence of the auditors.

         5. To review, upon completion of the audit, the financial statements to
be included in the Company's Annual Report on Form 10-K.

                                      17.


         6. To discuss with the  independent  auditors the results of the annual
audit,   including   the  auditors'   assessment   of  the  quality,   not  just
acceptability,  of accounting  principles,  the  reasonableness  of  significant
judgments,  the nature of significant  risks and exposures,  the adequacy of the
disclosures  in the financial  statements  and any other matters  required to be
communicated  to the  Committee  by the  independent  auditors  under  generally
accepted accounting standards.

         7. To evaluate the  cooperation  received by the  independent  auditors
during their audit examination, including any restrictions on the scope of their
activities or access to required records, data and information.

         8. To  confer  with  the  independent  auditors  and  with  the  senior
management of the Company  regarding the scope,  adequacy and  effectiveness  of
internal accounting and financial reporting controls in effect.

         9. To confer with the  independent  auditors and senior  management  in
separate executive sessions to discuss any matters that the Audit Committee, the
independent  auditors or senior management believe should be discussed privately
with the Audit Committee.

         10. To review with counsel any  significant  regulatory  or other legal
matters that could have a material impact on the Company's financial statements,
if, in the  judgment  of the  Audit  Committee,  such  review  is  necessary  or
appropriate.

         11. To  investigate  any matter  brought to the  attention of the Audit
Committee  within  the scope of its  duties,  with the  power to retain  outside
counsel and a separate  accounting  firm for this purpose if, in the judgment of
the  Audit   Committee,   such   investigation  or  retention  is  necessary  or
appropriate.

         12. To prepare the report  required by the rules of the  Securities and
Exchange Commission to be included in the Company's annual proxy statement.

         13. To review and assess the  adequacy  of this  charter  annually  and
recommend any proposed changes to the Board for approval.

         14. To report to the Board of  Directors  from time to time or whenever
it shall be called upon to do so.

         15. To perform such other  functions  and to have such powers as may be
necessary or appropriate in the efficient and lawful discharge of the foregoing.

                                      18.


                                    CASTELLE
                    PROXY SOLICITED BY THE BOARD OF DIRECTORS
                     FOR THE ANNUAL MEETING OF SHAREHOLDERS
                         TO BE HELD ON NOVEMBER 7, 2001

         The  undersigned  hereby appoints DONALD L. RICH, as attorney and proxy
of the undersigned,  with full power of substitution,  to vote all of the shares
of stock of Castelle which the undersigned may be entitled to vote at the Annual
Meeting of Shareholders of Castelle to be held at Castelle's  corporate  offices
at 855 Jarvis Drive, Suite 100, Morgan Hill,  California on Wednesday,  November
7, 2001 at 1:30 p.m. local time and at any and all postponements,  continuations
and adjournments  thereof, with all powers that the undersigned would possess if
personally  present,  upon  and in  respect  of  the  following  matters  and in
accordance with the following  instructions,  with discretionary authority as to
any and all other matters that may properly come before the meeting.

UNLESS A  CONTRARY  DIRECTION  IS  INDICATED,  THIS  PROXY WILL BE VOTED FOR ALL
NOMINEES LISTED IN PROPOSAL 1 AND FOR PROPOSAL 2, AS MORE SPECIFICALLY DESCRIBED
IN THE PROXY STATEMENT. IF SPECIFIC INSTRUCTIONS ARE INDICATED,  THIS PROXY WILL
BE VOTED IN ACCORDANCE THEREWITH.

MANAGEMENT RECOMMENDS A VOTE FOR THE NOMINEES FOR DIRECTOR LISTED BELOW.

PROPOSAL 1:  To elect directors  whether by cumulative  voting or otherwise,  to
             hold office until the next Annual Meeting of Shareholders and until
             their successors are elected.

|_|   FOR all nominees listed below              |_|   WITHHOLD AUTHORITY
      (except as marked to the contrary                to vote for all nominees
      below).                                          listed below.

NOMINEES:      Donald L. Rich, Peter R. Tierney, Robert H. Hambrecht,
               Scott C. McDonald and Jack Howard

TO WITHHOLD AUTHORITY TO VOTE FOR ANY NOMINEE(S), WRITE SUCH NOMINEE(S)' NAME(S)
BELOW:

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

--------------------------------------------------------------------------------
                            (Continued on other side)

                                      19.


                           (Continued from other side)

MANAGEMENT RECOMMENDS A VOTE FOR PROPOSAL 2.

PROPOSAL 2:  To ratify  selection of  PricewaterhouseCoopers  LLP as independent
             auditors of the Company  for its fiscal  year ending  December  31,
             2001.

         |_|      FOR            |_|     AGAINST           |_|     ABSTAIN

                                    Please  sign  exactly  as your name  appears
                                    hereon.  If the stock is  registered  in the
                                    names of two or more  persons,  each  should
                                    sign. Executors,  administrators,  trustees,
                                    guardians and  attorneys-in-fact  should add
                                    their  titles.  If signer is a  corporation,
                                    please give full  corporate  name and have a
                                    duly authorized officer sign, stating title.
                                    If signer is a  partnership,  please sign in
                                    partnership name by authorized person.

DATED
      -----------------             --------------------------------------------

                                    --------------------------------------------
                                                       SIGNATURE(S)

PLEASE VOTE, DATE AND PROMPTLY RETURN THIS PROXY IN THE ENCLOSED RETURN ENVELOPE
WHICH IS POSTAGE PREPAID IF MAILED IN THE UNITED STATES.

                                      20.