CASTELLE \CA\
10-Q, 2000-05-10
COMPUTER PERIPHERAL EQUIPMENT, NEC
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-Q

           |X| QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                  For the quarterly period ended March 31, 2000

          |_| TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                        Commission File Number: 0-220-20

                                    CASTELLE
             (Exact name of Registrant as specified in its charter)

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

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

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

        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


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 May 3, 2000 was 4,707,940

<PAGE>
<TABLE>
<CAPTION>


                                    CASTELLE
                                    Form 10-Q
                                Table of Contents



                                                                                                      Page

Part I.    Financial Information

     Item 1.    Financial Statements:
                <S>                                                                                    <C>
                Consolidated Balance Sheets                                                             2

                Consolidated Statements of Income                                                       3

                Consolidated Statements of Cash Flows                                                   4

                Notes to Consolidated Financial Statements                                              5


     Item 2.    Management's Discussion and Analysis of Financial Condition
                and Results of Operations                                                               8


Part II.   Other Information

     Item 1.    Legal Proceedings                                                                      11

     Item 2.    Changes in Securities and Use of Proceeds                                              11

     Item 3.    Quantitative and Qualitative Disclosure about Market Risk                              11

     Item 4.    Submission of Matters to a Vote of Security Holders                                    11

     Item 5.    Other Information                                                                      11

     Item 6.    Exhibits and Reports on Form 8-K                                                       11

                Signatures                                                                             12

                Exhibit 10.10 - 1988 Equity incentive Plan, as Amended
                and Form of Option Agreement                                                           E-1


                Exhibit 27.1 - Financial Data Schedule                                                E-21

                Exhibit 99.1 - Press Release dated April 27, 2000                                     E-22
</TABLE>
                                       1
<PAGE>
                         Part I - Financial Information

                          Item 1. Financial Statements
<TABLE>
<CAPTION>

                            CASTELLE AND SUBSIDIARIES
                           Consolidated Balance Sheets
                                 (in thousands)

                                                                      March 31, 2000        December 31, 1999
                                                                        (unaudited)             (audited)
                                                                  ----------------------  ---------------------
Assets:
   Current assets:
<S>                                                                         <C>                    <C>
     Cash and cash equivalents                                              $  4,438               $  4,714
     Restricted cash                                                             125                    125
     Accounts receivable, net of allowance for doubtful accounts
        of $205 in 2000 and $493 in 1999                                       1,410                  1,525
     Inventories, net                                                          1,305                  1,411
     Prepaid expense and other current assets                                    258                    262
                                                                  ----------------------  ---------------------
        Total current assets                                                   7,536                  8,037
   Property, plant & equipment, net                                              322                    387
   Other non-current assets, net                                                  70                     78
                                                                  ======================  =====================
        Total assets                                                        $  7,928               $  8,502
                                                                  ======================  =====================

Liabilities & Shareholders' Equity:
   Current liabilities:
     Long-term debt, current                                                 $    72                $    98
     Accounts payable                                                            793                  1,336
     Accrued liabilities                                                       2,848                  3,048
                                                                  ----------------------  ---------------------
        Total current liabilities                                              3,713                  4,482
                                                                  ----------------------  ---------------------
        Total liabilities                                                      3,713                  4,482
                                                                  ----------------------  ---------------------

   Shareholders' equity:
     Common stock, no par value:
        Authorized:  25,000 shares
        Issued and outstanding: 4,708 and 4,641 respectively                  29,015                 29,002
     Deferred compensation                                                       (54)                   (67)
     Accumulated deficit                                                     (24,746)               (24,915)
                                                                  ----------------------  ---------------------
        Total shareholders' equity                                             4,215                  4,020
                                                                  ======================  =====================
        Total liabilities & shareholders' equity                            $  7,928               $  8,502
                                                                  ======================  =====================
</TABLE>
     See accompanying notes to condensed consolidated financial statements.
                                       2
<PAGE>
<TABLE>
<CAPTION>

                      Consolidated Statements of Operations
                    (in thousands, except per share amounts)
                                   (unaudited)


                                                                                           Three months ended
                                                                                  ......................................
                                                                                    March 31, 2000       April 2, 1999
                                                                                  -----------------   ------------------
              <S>                                                                       <C>                  <C>
               Net sales                                                                $ 4,100              $ 4,468
               Cost of sales                                                              1,649                2,849
                                                                                  -----------------   ------------------
                   Gross profit                                                           2,451                1,619
                                                                                  -----------------   ------------------

               Operating expenses:
                   Research and development                                                 505                  684
                   Sales and marketing                                                    1,312                1,854
                   General and administrative                                               466                  459
                   Amortization of intangible assets                                          -                   40
                                                                                  -----------------   ------------------
                      Total operating expenses                                            2,283                3,037
                                                                                  -----------------   ------------------
               Income (loss) from operations                                                168               (1,418)

                   Interest income, net                                                       7                   30
                   Other income (expense), net                                                -                  (23)
                                                                                  -----------------   ------------------
               Income (loss) before provision for income taxes                              175               (1,411)
                   Provision for income taxes                                                 6                   --
                                                                                  =================   ==================
               Net income (loss)                                                          $ 169              $(1,411)
                                                                                  =================   ==================

               Earnings per share:
                  Net income (loss) per common share - basic                             $ 0.04              $ (0.33)
                  Shares used in per share calculation - basic                            4,660                4,340

                  Net income (loss) per common share - diluted                           $ 0.03              $ (0.33)
                  Shares used in per share calculation - diluted                          5,330                4,340
</TABLE>

     See accompanying notes to condensed consolidated financial statements.
                                       3
<PAGE>
<TABLE>
<CAPTION>

                            CASTELLE AND SUBSIDIARIES
                      Consolidated Statements of Cash Flows
                                 (in thousands)
                                   (unaudited)


                                                                                            Three months ended
                                                                                  ......................................
                                                                                    March 31, 2000       April 2, 1999
                                                                                  -----------------   ------------------
              <S>                                                                         <C>                <C>
               Cash flows from operating activities:
                  Net income (loss)                                                       $  169             $(1,411)
                  Adjustment to reconcile net income (loss) to net cash
                     provided by operating activities:
                    Depreciation and amortization                                            86                  158
                    Provision for doubtful accounts and sales returns                      (122)                (677)
                    Provision for excess and obsolete inventory                            (101)                 878
                    Compensation expense related to grant of stock options                   13                   13
                    Changes in assets and liabilities:
                     Accounts receivable                                                    237                1,471
                     Inventories                                                            207                 (190)
                     Prepaid expenses and other current assets                                4                  (61)
                     Accounts payable                                                      (543)                 372
                     Accrued liabilities and other long-term liabilities                   (200)                (159)
                                                                                  -----------------   ------------------
                       Net cash provided by (used in) operating activities                 (250)                 394
                                                                                  -----------------   ------------------

               Cash flows from investing activities:
                  Acquisition of property and equipment                                     (21)                 (57)
                  (Increase)/Decrease in other assets                                         8                   (5)
                                                                                  -----------------   ------------------
                                                                                  -----------------   ------------------
                          Net cash (used in) investing activities                           (13)                 (62)
                                                                                  -----------------   ------------------

               Cash flows from financing activities:
                  Repayment of notes payable                                                (26)                 (23)
                  Proceeds from issuance of common stock and warrants, net of
                    repurchases                                                              13                    2
                                                                                  -----------------   ------------------
                       Net cash (used in) financing activities                              (13)                 (21)
                                                                                  -----------------   ------------------


               Net increase/(decrease) in cash and cash equivalents                        (276)                 311

               Cash and cash equivalents at beginning of period                           4,714                3,924
                                                                                  =================   ==================
               Cash and cash equivalents at end of period                               $ 4,438              $ 4,235
                                                                                  =================   ==================
</TABLE>
     See accompanying notes to condensed consolidated financial statements.
                                       4
<PAGE>

                            CASTELLE AND SUBSIDIARIES
                   Notes To Consolidated Financial Statements
                                   (unaudited)


1.   Basis of Presentation:

     The accompanying  unaudited  consolidated  financial statements include the
     accounts  of  Castelle  and its  wholly  owned  subsidiaries  in the United
     Kingdom and the  Netherlands,  and have been  prepared in  accordance  with
     generally accepted  accounting  principles.  All intercompany  balances and
     transactions  have been  eliminated.  In the  opinion  of  management,  all
     adjustments  (consisting of normal recurring accruals) considered necessary
     for a fair  presentation of the Company's  financial  position,  results of
     operations  and cash flows at the dates and for the periods  indicated have
     been included. The result of operations for the interim period presented is
     not necessarily  indicative of the results for the year ending December 31,
     2000.  Because  all of  the  disclosures  required  by  generally  accepted
     accounting  principles  are not included in the  accompanying  consolidated
     financial  statements and related notes, they should be read in conjunction
     with the  audited  consolidated  financial  statements  and  related  notes
     included in the Company's Form 10-K for the fiscal year-ended  December 31,
     1999.  The year ended  condensed  balance  sheet data was derived  from our
     audited  financial  statements and does not include all of the  disclosures
     required by generally accepted accounting principles. The income statements
     for the periods presented are not necessarily indicative of results that we
     expect for any future period,  nor for the entire year.  Prior year amounts
     have been reclassified to conform with current presentation.

2.   Net Income (Loss) Per Share

     Basic net income (loss) per share is computed by dividing net income (loss)
     available to  shareholders  who hold common  stock by the weighted  average
     number of shares of common stock  outstanding for that period.  Diluted net
     income (loss) per share is computed giving effect to all dilutive potential
     shares of common stock that were  outstanding  during the period.  Dilutive
     potential  shares  consist of  incremental  shares of common stock issuable
     upon  exercise of stock options and  warrants.  In March 2000,  warrants to
     purchase 133,332 shares of common stock were exercised  whereby the holders
     of these warrants, netted, in cash-less exchanges,  68,997 shares of common
     stock. These warrants had a dilutive effect prior to their exercise, and as
     such are included in the diluted shares. In addition, there are warrants to
     purchase  100,000 shares of common stock  outstanding,  which have a strike
     price of $8.40 and expire in December 2000. These warrants are not included
     in the diluted share calculation.
                                       5
<PAGE>
     Basic and diluted  earnings per share are  calculated  as follows for first
     quarters of 2000 and 1999:
<TABLE>
<CAPTION>

                                                                  (in thousands,
                                                             except per share amounts)
                                                           .............................
                                                            March 31,       April 2,
                                                               2000           1999
                                                           -------------  --------------
Basic:
<S>                                                             <C>            <C>
   Weighted average common shares outstanding                   4,660          4,340
                                                           =============  ==============
                                                           =============  ==============
   Net income (loss)                                            $ 169       $ (1,411)
                                                           =============  ==============
                                                           =============  ==============
   Net income (loss) per common share - basic                  $ 0.04        $ (0.33)
                                                           =============  ==============

Diluted:
   Weighted average common shares outstanding                   4,660          4,340
   Common equivalent shares from stock warrants                    55             --
   Common equivalent shares from stock options                    615             --
                                                           =============  ==============
   Shares used in per share calculation - diluted               5,330          4,340
                                                           =============  ==============
                                                           =============  ==============
   Net income (loss)                                            $ 169       $ (1,411)
                                                           =============  ==============
                                                           =============  ==============
   Net income (loss) per common share - diluted                $ 0.03        $ (0.33)
                                                           =============  ==============
</TABLE>

     The  calculation  of diluted  shares  outstanding at April 2, 1999 excludes
     1,532,000  stock  options  and  233,000  warrants,   as  their  effect  was
     antidilutive  in the period.  At March 31, 2000 warrants  totaling  100,000
     were  excluded,  because their  exercise  price is greater than the average
     common stock market price during the period.

3.   Inventories:

     Inventories  are stated at the lower of standard  cost (which  approximates
     cost on a  first-in,  first-out  basis) or market and net of  reserves  for
     excess and obsolete inventory. Inventory details are as follows:
<TABLE>
<CAPTION>
                                                       (in thousands)
                                              .................................
                                                 March 31,      December 31,
                                                   2000             1999
                                              ---------------------------------
<S>                                                 <C>              <C>
  Raw material                                      $  184           $  136
  Work in process                                                       300
                                                       257
  Finished goods                                                        975
                                                       864
                                              =================================
  Total Inventory                                  $ 1,305          $ 1,411
                                              =================================
</TABLE>

4.   Revenue Recognition:

     Product revenue is recognized  upon shipment if a signed  contract  exists,
     the fee is fixed and determinable,  collection of the resulting receivables
     is probable  and  product  returns are  reasonably  estimable.  The Company
     enters  into  agreements  with  certain of its  distributors  which  permit
     limited  stock  rotation  rights.  These stock  rotation  rights  allow the
     distributor  to return  products  for credit but  require  the  purchase of
     additional  products of equal  value.  Revenues  subject to stock  rotation
     rights are reduced by  management's  estimates  of  anticipated  exchanges.
     Provisions for estimated  warranty costs and anticipated  retroactive price
     adjustments  are recorded at the time  products  are  shipped.  The Company
     recognizes  revenue from the sale of extended  warranty  contracts  ratably
     over the period of the contracts.
                                       6

<PAGE>
5.   Segments Disclosure:

     The Company has adopted  SFAS No.  131,  "Disclosure  about  Segments of an
     Enterprise  and Related  Information,"  which is effective for fiscal years
     beginning  after December 31, 1997.  SFAS No. 131  supersedes  SFAS No. 14,
     "Financial  Reporting for Segments of a Business  Enterprise." SFAS No. 131
     changes current  practice under SFAS No. 14 by establishing a new framework
     on which to base segment reporting and introduces  requirements for interim
     reporting  of segment  information.  The  Company  has  determined  that it
     operates in one segment.


6.   Comprehensive Income:

     Comprehensive  income is the change in equity from  transactions  and other
     events and  circumstances  other than those  resulting from  investments by
     owners and distributions to owners. There are no significant  components of
     comprehensive  income  excluded  from net  income,  therefore,  no separate
     statement of comprehensive income has been presented.

7.       New accounting pronouncements:

     In June 1998,  the  Financial  Accounting  Standards  Board  (FASB)  issued
     Statement  of  Financial  Standards  No. 133  (SFAS 133),  "Accounting  for
     Derivative   Instruments  and  Hedging   Activities,"   which   establishes
     accounting  and reporting  standards  for  derivative  instruments  and for
     hedging activities. It requires that an entity recognize all derivatives as
     either assets or  liabilities  in the  statement of financial  position and
     measures those  instruments  at fair value.  Changes in fair value shall be
     recognized  currently in earnings.  Management  believes the impact of SFAS
     No. 133 will not have a material  on the  financial  position or results of
     operations of the Company.  The Company will adopt  SFAS No. 133 as amended
     by SFAS 137 "Accounting for Derivative Instruments and Hedging Activities -
     Deferral of the  Effective  Date of FASB  Statement  No. 133" for its third
     quarterly filing of fiscal 2000.

     In November  1999, the SEC issued Staff  Accounting  Bulletin (SAB) No. 100
     "Restructuring  and  Impairment  Charges." The SAB discusses the accounting
     for and disclosure of certain expenses commonly reported in connection with
     exit activities and business  combinations.  Management believes the impact
     of SAB 100 will not have a material  impact on the  financial  position  or
     results of operations of the Company.

     On December 1999 the Securities and Exchange  Commission (SEC) issued Staff
     Accounting  Bulletin  (SAB)  No.  101  "Revenue  Recognition  in  Financial
     Statements"  which provides  guidance on the recognition,  presentation and
     disclosure of revenue in financial  statements  filed with the SEC. SAB 101
     outlines  the basic  criteria  that must be met to  recognize  revenue  and
     provides guidance for disclosures related to revenue recognition  policies.
     Management  believes the impact of SAB 101 will not have a material  impact
     on the financial position or results of operations of the Company.

                                       7
<PAGE>
 Item 2.     Management's Discussion and Analysis of Financial Condition and
             Results of Operations

This Management's  Discussion and Analysis contains  forward-looking  statements
that involve risks and uncertainties.  The Company's  operating results may vary
significantly  from  quarter to quarter due to a variety of  factors,  including
changes in the Company's product and customer mix,  constraints in the Company's
manufacturing and assembling operations, shortages or increases in the prices of
raw materials and  components,  changes in pricing  policy by the Company or its
competitors,  a slowdown in the growth of the  networking  market,  seasonality,
timing of expenditures and economic conditions in the United States,  Europe and
Asia. Words such as "believes,"  "anticipates," "expects," "intends" and similar
expressions are intended to identify forward-looking statements, but are not the
exclusive means of identifying such  statements.  Readers are cautioned that the
forward-looking  statements  reflect  management's  analysis only as of the date
hereof, and the Company assumes no obligation to update these statements. Actual
events or results  may  differ  materially  from the  results  discussed  in the
forward-looking statements.  Factors that might cause such a difference include,
but are not limited to the risks and uncertainties  discussed herein, as well as
other risks set forth under the caption "Risk  Factors" in the Company's  Annual
Report on Form 10-K for the fiscal year ended  December 31, 1999.  The following
discussion  should be read in conjunction with the Financial  Statements and the
Notes thereto  included in Item 1 of this  Quarterly  Report on Form 10-Q and in
the Company's Form 10-K for the fiscal year ended December 31, 1999.
<TABLE>
<CAPTION>

        Consolidated Statements of Income - As a Percentage of Net Sales


                                                                                       Three months ended
                                                                              ......................................
                                                                                March 31, 2000       April 2, 1999
                                                                              ------------------  ------------------
              <S>                                                                       <C>                 <C>
               Net sales                                                                100%                100%
               Cost of sales                                                             40%                 64%
                                                                              ------------------  ------------------
                   Gross profit                                                          60%                 36%
                                                                              ------------------  ------------------

               Operating expenses:
                   Research and development                                              13%                 15%
                   Sales and marketing                                                   32%                 42%
                   General and administrative                                            11%                 10%
                   Amortization of intangible assets                                      0%                  1%
                                                                              ------------------  ------------------
                      Total operating expense                                            56%                 68%
                                                                              ------------------  ------------------
               Income (loss) from operations                                              4%                (32%)

                   Interest income, net                                                   0%                  1%
                   Other income (expense), net                                           (0%)                (1%)
                                                                              ------------------  ------------------
               Income (loss) before provision for income taxes                            4%                (32%)
                   Provision for income taxes                                             --                  --
                                                                              ==================  ==================
               Net Income (loss)                                                          4%                (32%)
                                                                              ==================  ==================
</TABLE>
                                       8



<PAGE>

Results of Operations

     Net Sales

          Net sales for the first  quarter of 2000 were $4.1 million as compared
     to $4.5  million for the same period in 1999.  The $368,000  reduction  was
     primarily  attributable to the continued  decline in the sales of the print
     server  products of $299,000 (29%) and a decrease in sales from the Traffic
     Software  Object Fax line of products of $127,000  (100%),  which has since
     been  discontinued.  These reductions were offset by a moderate increase of
     $57,000 (2%) in the Company's enhanced fax server products.

          International  sales in the first  quarter of 2000 were $1.2  million,
     compared to $1.7 million for the same period in 1999,  representing 29% and
     37%,  respectively,  of total net sales.  This 29%  decline  from the first
     quarter  of 1999 to the first  quarter  of 2000 was  mainly  the  result of
     reduced demand for the Company's  print server  products in Asia.  Domestic
     sales in the first quarter of 2000  improved  slightly over the same period
     of last year.

     Gross Profit

          Gross  profit of $2.5  million  (60%) for the first  quarter of fiscal
     2000  improved  from $1.6  million  (36%) for the same period in 1999.  The
     gross  profit in the first  quarter of 1999  included  an  $880,000  excess
     inventory  provision  mainly  associated  with the print  server  products.
     Excluding the reserve,  the gross profit  improvement would have been 4% in
     the fiscal quarter of
     2000.

     Research & Development

          Research and product development  expenses were $505,000 or 13% of net
     sales for the first  quarter of 2000 as  compared to $684,000 or 15% of net
     sales for the same  period  in 1999.  The  decrease  was  primarily  due to
     reduction in headcount and outside consulting expenses.

     Sales & Marketing

          Sales and marketing expenses were $1.3 million or 32% of net sales for
     the first  quarter of 2000, as compared to $1.9 million or 42% of net sales
     for the same period in 1999. The reduction of sales and marketing  expenses
     was associated with lower sales personnel costs and controlled  promotional
     expenses.

     General & Administrative

          General and administrative  expenses were $466,000 or 11% of net sales
     for the first quarter of 2000, flat as compared to the same period in 1999.


Liquidity and Capital Resources

     As of  March  31,  2000,  the  Company  had $4.4  million  of cash and cash
equivalents,  a decrease of $276,000  from  December  31,  1999,  while  working
capital  increased  to $3.8  million  at March 31,  2000,  from $3.6  million at
December 31,  1999.  The increase in working  capital was  primarily  due to the
Company's focused efforts to improve accounts receivable.
                                       9
<PAGE>
     The Company has a $3.0 million secured revolving line of credit with a bank
from which the  Company may borrow  100%  against  pledges of cash at the bank's
prime rate. This loan agreement has been  renegotiated and extended for one year
from  March  17,  2000.  Under  the terms of this new  agreement,  the  previous
restriction   of  limiting  the  Company  from  entering  into  any  mergers  or
acquisitions  where the total  consideration  exceeds  $15,000,000  without  the
bank's consent is removed.  There has been no borrowing  against this line as of
March 31, 2000.

     In December  1997, the Company  entered into a loan and security  agreement
with a finance  company  for an amount of  $288,000.  The amounts  borrowed  are
subject  to  interest  of  10.11%,  are  repayable  by  December  2000,  and are
collateralized  by a certificate of deposit of $125,000,  which is classified as
restricted  cash on the  Company's  balance  sheet.  As of March 31,  2000,  the
outstanding balance of the loan under the agreement was $72,000.

     As of March 31, 2000, net accounts receivable were $1.4 million,  down from
$1.5 million at December 31, 1999.  The decrease in net accounts  receivable was
attributed to improved  collection of outstanding  balances in the first quarter
of 2000.

     Net  inventories  as of March 31,  2000 were $1.3  million,  down from $1.4
million at December 31,  1999.  The  decrease  was largely  attributable  to the
Company's  continued  effort to manage down  inventory at all levels.  Inventory
turnover for the quarter improved to 5.1 from 4.4 turns in the prior quarter.

     The Company did not make any material capital  commitments during the first
quarter ended March 31, 2000.

     Although  the  Company  believes  that  its  existing  capital   resources,
anticipated  cash flows from  operations  and available  lines of credit will be
sufficient to meet its capital requirements at least through the next 12 months,
the Company may be required to seek  additional  equity or debt  financing.  The
timing and amount of such capital requirements cannot be determined at this time
and will  depend on a number of  factors,  including  demand  for the  Company's
existing and new products and the pace of technological change in the networking
industry.  There can be no  assurance  that such  additional  financing  will be
available on satisfactory terms when needed, if at all.

     Management believes that, for the periods presented,  inflation has not had
a material effect on the Company's operations.

Other Matters

     The Company's  Common Stock has been listed on the Nasdaq  SmallCap  Market
since  April  1999.  In order to  maintain  its  listing on the Nasdaq  SmallCap
Market,  the Company must  maintain  total  assets,  capital and public float at
specified  levels,  and generally must maintain a minimum bid price of $1.00 per
share.  If the Company fails to maintain the standard  necessary to be quoted on
the Nasdaq SmallCap  Market,  the Company's Common Stock could become subject to
delisting. If the Common Stock is delisted, trading in the Common Stock could be
conducted on the OTC Bulletin Board or in the over-the-counter market in what is
commonly  referred to as the "pink sheets." If this occurs,  a shareholder  will
find it more  difficult  to dispose of the  Common  Stock or to obtain  accurate
quotations  as to the price of the  Common  Stock.  Lack of any  active  trading
market would have an adverse effect on a  shareholder's  ability to liquidate an
investment  in the  Company's  Common  Stock  easily and quickly at a reasonable
price.  It might  also  contribute  to  volatility  in the  market  price of the
Company's Common Stock and could adversely effect the Company's ability to raise
additional  equity or debt financing on acceptable  terms or at all.  Failure to
obtain  desired  financing  on  acceptable  terms  could  adversely  affect  the
Company's  business,  financial  condition and results of operations.  These an
                                       10
<PAGE>
other risk factors are discussed in more detail in the  Company's  Form 10-K for
the fiscal year ended December 31, 1999 under the section "Risk Factors."


                           PART II - OTHER INFORMATION


Item 1.    Legal Proceedings

         None.


Item 2.    Changes in Securities and use of proceeds

     On March 31, 2000,  the Company  issued  68,997 shares of Common Stock upon
the net exercise of warrants to purchase  133,332 shares of Common Stock with an
exercise  price of $1.00 per  share.  The sales and  issuances  of the shares of
Common  Stock were claimed by the Company to be exempt from  registration  under
the  Securities  Act by virtue of Section 4(2) and/or  Regulation D  promulgated
thereunder.  The recipient made representations with respect to its intention to
acquire the securities  for investment  purposes only and not with a view to the
distribution  thereof and its  experience  in financial  and  business  matters.
Appropriate  legends  were  affixed  to the  stock  certificates  issued in such
transactions.  The  recipient  represented  that  it  either  received  adequate
information about the Company or had access, through business relationships,  to
such information.



Item 3.    Quantitative and Qualitative disclosure about market risk

         None.


Item 4.    Submission of Matters to a Vote of Security Holders

         None.


Item 5.    Other Information

         None.


Item 6.     Exhibits and Reports on Form 8-K

        (a)      Exhibits:

                      10.3*    1988 Equity Incentive Plan, as amended, and Form
                               Of Option Agreements.

                      27.1     Financial Data Schedule

                      99.1     Press Release dated April 27, 2000

        (b)      Reports on Form 8-K

                      None

__________________

               *  Indicates   management  contracts  or  compensatory  plans  or
          arrangements filed pursuant to Item 601(b)(10) of Regulation S-K.
                                       11

<PAGE>
                                   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/ Donald L. Rich                                      Date: May 9, 2000
      Donald L. Rich
      President, Chief Executive Officer,
      Chief Financial Officer and Director
     (Principal Executive Officer and
      Principal Finance and Accounting Officer)



                                       12
<PAGE>


                                                                   Exhibit 10.10

                                    CASTELLE

                           1988 EQUITY INCENTIVE PLAN

                             Adopted: April 29, 1988
          Amended: June 22, 1995, November 15, 1995 and April 30, 1997
                            Approved: April 29, 1998
                           Amended: February 24, 2000


1.       Purposes.

     (a) The  purpose  of the  Plan is to  provide  a means  by  which  selected
Employees of and  Consultants or Directors to the Company,  and its  Affiliates,
may be given an  opportunity  to benefit from increases in value of the stock of
the  Company  through  the  granting  of  (i)  Incentive  Stock  Options,   (ii)
Nonstatutory  Stock Options,  (iii) stock  bonuses,  and (iv) rights to purchase
restricted stock, all as defined below.

     (b) The  Company,  by means of the Plan,  seeks to retain the  services  of
persons who are now Employees of or  Consultants  or Directors to the Company or
its  Affiliates,  to secure and retain the services of new Employees,  Directors
and  Consultants,  and to provide  incentives  for such persons to exert maximum
efforts for the success of the Company and its Affiliates.

     (c) The Company  intends that the Stock Awards issued under the Plan shall,
in the  discretion  of the Board or any  Committee to which  responsibility  for
administration  of the Plan has been delegated  pursuant to subsection  3(c), be
either (i) Options  granted  pursuant to Section 6 hereof,  including  Incentive
Stock Options and Nonstatutory Stock Options, or (ii) stock bonuses or rights to
purchase  restricted  stock  granted  pursuant to Section 7 hereof.  All Options
shall be separately  designated  Incentive Stock Options or  Nonstatutory  Stock
Options at the time of grant,  and in such form as issued pursuant to Section 6,
and a separate  certificate or certificates  will be issued for shares purchased
on exercise of each type of Option.

2.       Definitions.

     (a)  "Affiliate"  means any parent  corporation or subsidiary  corporation,
whether now or hereafter existing, as those terms are defined in Sections 424(e)
and (f) respectively, of the Code.

     (b) "Board" means the Board of Directors of the Company.

     (c) "Code" means the Internal Revenue Code of 1986, as amended.

     (d) "Committee" means a Committee appointed by the Board in accordance with
subsection 3(c) of the Plan.

     (e) "Company" means Castelle, a California corporation.

                                      E-1

<PAGE>

     (f)  "Consultant"  means any person,  including an advisor,  engaged by the
Company or an Affiliate to render consulting services and who is compensated for
such services,  provided that the term "Consultant"  shall not include Directors
who are paid only a director's fee by the Company or who are not  compensated by
the Company for their services as Directors.

     (g) "Continuous  Status as an Employee,  Director or Consultant"  means the
Optionee's  service  with the  Company,  whether  as an  Employee,  Director  or
Consultant is not interrupted or terminated.  The Board, in its sole discretion,
may determine whether  Continuous Status as an Employee,  Director or Consultant
shall  be  considered  interrupted  in the  case of:  (i) any  leave of  absence
approved  by the Board,  including  sick  leave,  military  leave,  or any other
personal  leave;  or  (ii) transfers  between the Company,  Affiliates  or their
successors.

     (h) "Covered  Employee" means the chief executive  officer and the four (4)
other highest compensated officers of the Company for whom total compensation is
required to be reported to  shareholders  under the Exchange  Act, as determined
for purposes of Section 162(m) of the Code.

     (i) "Director" means a member of the Board.

     (j) "Employee" means any person, including Officers and Directors, employed
by the Company or any  Affiliate of the Company.  Neither  service as a Director
nor payment of a directo's fee by the Company shall be sufficient to constitute
"employment" by the Company.

     (k) "Exchange Act" means the Securities Exchange Act of 1934, as amended.

     (l) "Fair  Market  Value"  means,  as of any date,  the value of the common
stock of the Company determined as follows:

          (1) If the common stock is listed on any established stock exchange or
     traded on the Nasdaq  National Market or The Nasdaq  SmallCap  Market,  the
     Fair Market  Value of a share of common  stock  shall be the closing  sales
     price for such stock (or the  closing  bid, if no sales were  reported)  as
     quoted on such  exchange  or market  (or the  exchange  or market  with the
     greatest  volume of trading in common stock) on the last market trading day
     prior to the day of  determination,  as reported in the Wall Street Journal
     or such other source as the Board deems reliable; or

          (2) In the absence of an established  market for the common stock, the
     Fair Market Value shall be determined in good faith by the Board.

     (m)  "Incentive  Stock  Option"  means an Option  intended to qualify as an
incentive  stock option  within the meaning of  Section 422  of the Code and the
regulations promulgated thereunder.

     (n)  "Listing  Date"  means the first date upon which any  security  of the
Company is listed (or  approved  for  listing)  upon  notice of  issuance on any
securities  exchange or  designated  (or  approved  designation)  upon notice of
issuance as a national  market  security on an interdealer  quotation  system if
such securities  exchange or interdealer  quotation system has been certified in
accordance with the provisions of Section  25100(o) of the California  Corporate
Securities Law of 1968.

                                      E-2
<PAGE>

     (o) "Employee  Director"  means a Director of the Company who either (i) is
not a current  Employee or Officer of the Company or its parent or a subsidiary,
does not receive  compensation  (directly or indirectly) from the Company or its
parent or a subsidiary for services  rendered as a consultant or in any capacity
other than as a Director  (except for an amount as to which disclosure would not
be required  under Item 404(a) of  Regulation  S-K  promulgated  pursuant to the
Securities Act  ("Regulation  S-K")),  does not possess an interest in any other
transaction  as to which  disclosure  would be  required  under  Item  404(a) of
Regulation  S-K  and is not  engaged  in a  business  relationship  as to  which
disclosure  would be required  under Item 404(b) of  Regulation  S-K; or (ii) is
otherwise considered a "non-employee director" for purposes of Rule 16b-3.

     (p) "Nonstatutory  Stock Option" means an Option not intended to qualify as
an Incentive Stock Option.

     (q)  "Officer"  means a person who is an officer of the Company  within the
meaning  of  Section 16  of the  Exchange  Act and  the  rules  and  regulations
promulgated thereunder.

     (r) "Option" means a stock option granted pursuant to the Plan.

     (s) "Option Agreement" means a written agreement between the Company and an
Optionee evidencing the terms and conditions of an individual Option grant. Each
Option Agreement shall be subject to the terms and conditions of the Plan.

     (t)  "Optionee"  means an  Employee,  Director or  Consultant  who holds an
outstanding Option.

     (u)  "Outside  Director"  means a Director  who either (i) is not a current
employee of the Company or an  "affiliated  corporation"  (within the meaning of
Treasury  regulations  promulgated  under Section 162(m) of the Code),  is not a
former  employee  of  the  Company  or  an  "affiliated  corporation"  receiving
compensation  for prior  services  (other than  benefits  under a tax  qualified
pension plan), was not an officer of the Company or an "affiliated  corporation"
at any time, and is not currently receiving direct or indirect remuneration from
the Company or an  "affiliated  corporation"  for services in any capacity other
than as a Director,  or (ii) is otherwise  considered an "outside  director" for
purposes of Section 162(m) of the Code.

     (v) "Plan" means this Castelle 1988 Equity Incentive Plan.

     (w) "Rule 16b-3"  means Rule 16b-3 of the Exchange Act or any  successor to
Rule 16b-3, as in effect when discretion is being
exercised with respect to the Plan.

     (x) "Stock  Award" means any right  granted  under the Plan,  including any
Option, any stock bonus or any right to purchase restricted stock.

     (y) "Stock Award Agreement" means a written  agreement  between the Company
and a  holder  of a Stock  Award  evidencing  the  terms  and  conditions  of an
individual Stock Award grant. Each Stock Award Agreement shall be subject to the
terms and conditions of the Plan.



3.       Administration.

     (a) The Plan shall be  administered by the Board unless and until the Board
delegates administration to a Committee, as provided in subsection 3(c).
                                      E-3
<PAGE>

     (b) The Board shall have the power,  subject to, and within the limitations
of, the express provisions of the Plan:

          (1) To determine from time to time which of the persons eligible under
     the Plan shall be granted Stock Awards; when and how each Stock Award shall
     be granted;  whether a Stock Award will be an  Incentive  Stock  Option,  a
     Nonstatutory  Stock Option,  a stock bonus, a right to purchase  restricted
     stock,  or a combination  of the  foregoing;  the  provisions of each Stock
     Award granted  (which need not be  identical),  including the time or times
     when a person  shall be  permitted  to receive  stock  pursuant  to a Stock
     Award;  and the number of shares with  respect to which a Stock Award shall
     be granted to each such person.

          (2) To construe and interpret the Plan and Stock Awards  granted under
     it,  and to  establish,  amend and  revoke  rules and  regulations  for its
     administration.  The Board, in the exercise of this power,  may correct any
     defect,  omission  or  inconsistency  in the  Plan  or in any  Stock  Award
     Agreement,  in a manner  and to the  extent  it  shall  deem  necessary  or
     expedient to make the Plan fully effective.

          (3) To amend the Plan or a Stock Award as provided in Section 13.

          (4) Generally, to exercise such powers and to perform such acts as the
     Board deems  necessary or  expedient  to promote the best  interests of the
     Company which are not in conflict with the provisions of the Plan.

     (c) The Board may  delegate  administration  of the Plan to a Committee  or
Committees of one or more members of the Board, and the term  "Committee"  shall
apply to any person or persons to whom such  authority  has been  delegated.  If
administration  is  delegated  to a  Committee,  the  Committee  shall have,  in
connection with the administration of the Plan, the powers theretofore possessed
by the Board,  including  the power to  delegate  to a  subcommittee  any of the
administrative powers the Committee is authorized to exercise (and references in
this Plan to the Board shall  thereafter be to the  Committee or  subcommittee),
subject,  however, to such resolutions,  not inconsistent with the provisions of
the  Plan,  as may be  adopted  from  time to time by the  Board.  The Board may
abolish the Committee at any time and revest in the Board the  administration of
the Plan.

     In the  discretion of the Board,  a Committee may consist  solely of two or
more Outside  Directors,  in accordance with Section 162(m) of the Code,  and/or
solely of two or more  Non-Employee  Directors,  in accordance  with Rule 16b-3.
Within the scope of such authority,  the Board or the Committee may (i) delegate
to a  committee  of one or  more  members  of the  Board  who  are  not  Outside
Directors,  the  authority  to grant Stock  Awards to  eligible  persons who are
either  (A) not  then  Covered  Employees  and are not  expected  to be  Covered
Employees at the time of recognition  of income  resulting from such Stock Award
or (B) not  persons  with  respect  to whom the  Company  wishes to comply  with
Section  162(m) of the Code and/or (ii)  delegate to a committee  of one or more
members of the Board who are not  Non-Employee  Directors the authority to grant
Stock  Awards to eligible  persons who are not then subject to Section 16 of the
ExchangeAct.

4.       Shares subject to the plan.

     (a) Subject to the  provisions of Section 12 relating to  adjustments  upon
changes in stock,  the stock that may be issued  pursuant to Stock  Awards shall
not exceed in the aggregate one million nine hundred twenty-seven  thousand five
hundred  seventeen  (1,927,517)  shares of the Company's  common  stock.  If any
Option shall for any reason expire or otherwise terminate,  in whole or in part,
without  having been exercised in full, the stock not acquired under such Option
shall revert to and again become  available for issuance  under the Plan. If any
shares of the
                                      E-4
<PAGE>
     Company's  common stock which are subject to a repurchase or  reacquisition
right  in  favor of the  Company,  any such  shares  which  are  repurchased  or
reacquired  by the Company  pursuant to the terms of such rights shall revert to
and again become available for issuance under the Plan.

     (b) The stock  subject  to the Plan may be  unissued  shares or  reacquired
shares, bought on the market or otherwise.

5.       Eligibility.


     (a) Incentive Stock Options may be granted only to Employees.  Stock Awards
other than Incentive  Stock Options may be granted only to Employees,  Directors
or Consultants.

     (b) No person shall be eligible for the grant of an Incentive  Stock Option
if, at the time of grant,  such  person  owns (or is deemed to own  pursuant  to
Section 424(d) of the Code) stock  possessing more than ten percent (10%) of the
total combined  voting power of all classes of stock of the Company or of any of
its Affiliates  unless the exercise  price of such Incentive  Stock Option is at
least one hundred ten percent  (110%) of the Fair Market  Value of such stock at
the date of grant and the Incentive  Stock Option is not  exercisable  after the
expiration  of five  (5)  years  from  the  date of  grant,  or in the case of a
restricted  stock  purchase  award,  the purchase  price is at least one hundred
percent (100%) of the Fair Market Value of such stock at the date of grant.

     (c) Subject to the  provisions of Section 12 relating to  adjustments  upon
changes in stock, no employee shall be eligible to be granted  Options  covering
more than four hundred thousand  (400,000) shares of the Common Stock during any
calendar year.

6.       Option Provisions.

     Each  Option  shall be in such  form  and  shall  contain  such  terms  and
conditions  as the Board  shall deem  appropriate.  The  provisions  of separate
Options  need  not  be  identical,   but  each  Option  shall  include  (through
incorporation of provisions  hereof by reference in the Option or otherwise) the
substance of each of the following provisions:

     (a) Term. No Option shall be  exercisable  after the expiration of ten (10)
years from the date it was granted.

     (b) Price.  The exercise price of each Incentive  Stock Option shall be not
less  than one  hundred  percent  (100%) of the Fair  Market  Value of the stock
subject to the Option on the date the Option is  granted  (one  hundred  and ten
percent  (110%) in the case of a 10%  shareholder as described in Section 5(b));
the  exercise  price of each  Nonstatutory  Stock  Option shall be not less than
eighty-five  percent (85%) percent of the Fair Market Value of the stock subject
to the Option on the date the Option is granted.  Notwithstanding the foregoing,
an Option (whether an Incentive Stock Option or a Nonstatutory Stock Option) may
be granted  with an exercise  price  lower than that set forth in the  preceding
sentence if such Option is granted pursuant to an assumption or substitution for
another  option in a manner  satisfying  the provisions of Section 424(a) of the
Code.

     (c)  Consideration.  The purchase  price of stock  acquired  pursuant to an
Option  shall be paid,  to the  extent  permitted  by  applicable  statutes  and
regulations,  either (i) in cash at the time the Option is exercised, or (ii) at
the  discretion of the Board or the  Committee,  at the time of the grant of the
Option,  (A) by  delivery to the Company of other  common  stock of the Company,
(B) according  to a deferred  payment or other  arrangement  (which may include,
without limiting the generality of the foregoing,  the use of other common stock
of the  Company)  with the  person to whom the  Option is granted or to whom the
Option is transferred pursuant to subsection 6(d),
                                      E-5
<PAGE>

or (C) in any other form of legal  consideration  that may be  acceptable to the
Board.  In the  case of any  deferred  payment  arrangement,  interest  shall be
payable at least  annually  and shall be charged at the minimum rate of interest
necessary to avoid the treatment as interest, under any applicable provisions of
the Code,  of any amounts  other than  amounts  stated to be interest  under the
deferred  payment  arrangement.  The  principal  amount of any deferred  payment
arrangement  shall not exceed the amount  permitted  by law,  including  but not
limited to any state corporate law requirements  requiring the immediate payment
of the par value of stock.

     (d)  Transferability.  An Incentive  Stock Option shall not be transferable
except  by will  or by the  laws of  descent  and  distribution,  and  shall  be
exercisable during the lifetime of the person to whom the Incentive Stock Option
is  granted  only  by  such  person.  A  Nonstatutory   Stock  Option  shall  be
transferable to the extent provided in the Option Agreement;  provided, however,
that if the Option Agreement does not specifically  provide for transferability,
then such Nonstatutory Stock Option shall be not be transferable  except by will
or by the laws of descent and distribution.  Notwithstanding the foregoing,  the
person to whom the Option is granted may, by  delivering  written  notice to the
Company, in a form satisfactory to the Company,  designate a third party who, in
the event of the death of the Optionee, shall thereafter be entitled to exercise
the Option.

     (e) Vesting.  The total number of shares of stock subject to an Option may,
but need not, be allotted in periodic  installments (which may, but need not, be
equal).  The Option  Agreement may provide that from time to time during each of
such  installment  periods,  the  Option may become  exercisable  ("vest")  with
respect  to some  or all of the  shares  allotted  to  that  period,  and may be
exercised  with  respect to some or all of the shares  allotted  to such  period
and/or any prior period as to which the Option  became  vested but was not fully
exercised.  The Option may be subject to such other terms and  conditions on the
time or times when it may be  exercised  (which may be based on  performance  or
other  criteria) as the Board may deem  appropriate.  The vesting  provisions of
individual  options may vary. The provisions of this subsection 6(e) are subject
to any Option  provisions  governing the minimum number of shares as to which an
Option may be exercised.

     (f) Termination of Employment or Relationship as a Consultant. In the event
an  Optionee's  Continuous  Status  as  an  Employee,   Director  or  Consultant
terminates  (other than upon the Optionee's  death or disability),  the Optionee
may  exercise his or her Option (to the extent that the Optionee was entitled to
exercise  it at the date of  termination)  but only  within  such period of time
ending on the earlier of (i) the date three (3) months after the  termination of
the Optionee's Continuous Status as an Employee, Director or Consultant (or such
longer  or  shorter  period  specified  in the  Option  Agreement,  or (ii)  the
expiration of the term of the Option as set forth in the Option  Agreement.  If,
after  termination,  the Optionee does not exercise his or her Option within the
time  specified in the Option  Agreement,  the Option shall  terminate,  and the
shares  covered by such Option shall revert to and again  become  available  for
issuance under the Plan.

     (g) Disability of Optionee. In the event an Optionee's Continuous Status as
an Employee,  Director or Consultant  terminates  as a result of the  Optionee's
disability,  the Optionee may exercise his or her Option (to the extent that the
Optionee  was  entitled  to exercise  it at the date of  termination),  but only
within  such  period of time  ending on the  earlier of (i) the date twelve (12)
months following such termination (or such longer or shorter period specified in
the Option  Agreement,  or (ii) the  expiration of the term of the Option as set
forth in the Option Agreement.  If, at the date of termination,  the Optionee is
not entitled to exercise  his or her entire  Option,  the shares  covered by the
unexercisable  portion of the Option shall revert to and again become  available
for issuance  under the Plan.  If,  after  termination,  the  Optionee  does not
exercise his or her Option within the time  specified  herein,  the Option shall
terminate, and the
                                      E-6
<PAGE>

shares  covered by such Option shall revert to and again  become  available  for
issuance under the Plan.

     (h) Death of Optionee.  In the event of the death of an Optionee during, or
within a period specified in the Option after the termination of, the Optionee's
Continuous  Status as an  Employee,  Director or  Consultant,  the Option may be
exercised (to the extent the Optionee was entitled to exercise the Option at the
date of death) by the Optionee's  estate,  by a person who acquired the right to
exercise  the Option by  bequest or  inheritance  or by a person  designated  to
exercise the option upon the Optionee's  death pursuant to subsection  6(d), but
only  within the period  ending on the  earlier  of (i) the date  eighteen  (18)
months  following the date of death (or such longer or shorter period  specified
in the Option  Agreement,  or (ii) the  expiration of the term of such Option as
set forth in the Option  Agreement.  If, at the time of death,  the Optionee was
not entitled to exercise  his or her entire  Option,  the shares  covered by the
unexercisable  portion of the Option shall revert to and again become  available
for issuance under the Plan. If, after death, the Option is not exercised within
the time specified herein, the Option shall terminate, and the shares covered by
such Option shall revert to and again become  available  for issuance  under the
Plan.

     (i) Early  Exercise.  The Option  may,  but need not,  include a  provision
whereby  the  Optionee  may elect at any time  while an  Employee,  Director  or
Consultant to exercise the Option as to any part or all of the shares subject to
the Option  prior to the full  vesting of the  Option.  Any  unvested  shares so
purchased may be subject to a repurchase right in favor of the Company or to any
other restriction the Board determines to be appropriate.

     (j) Re-Load Options. Without in any way limiting the authority of the Board
or  Committee to make or not to make grants of Options  hereunder,  the Board or
Committee shall have the authority (but not an obligation) to include as part of
any Option  Agreement a provision  entitling the Optionee to a further Option (a
"Re-Load  Option") in the event the Optionee  exercises the Option  evidenced by
the Option  Agreement,  in whole or in part,  by  surrendering  other  shares of
common stock in  accordance  with this Plan and the terms and  conditions of the
Option  Agreement.  Any such Re-Load  Option (i) shall be for a number of shares
equal to the number of shares  surrendered  as part or all of the exercise price
of such  Option;  (ii)  shall have an  expiration  date which is the same as the
expiration  date of the Option the  exercise of which gave rise to such  Re-Load
Option;  and (iii)  shall have an  exercise  price which is equal to one hundred
percent  (100%) of the Fair  Market  Value of the  common  stock  subject to the
Re-Load Option on the date of exercise of the original  Option.  Notwithstanding
the foregoing,  a Re-Load Option which is an Incentive Stock Option and which is
granted to a 10%  shareholder (as described in subsection  5(b)),  shall have an
exercise  price which is equal to one  hundred  ten  percent  (110%) of the Fair
Market Value of the stock subject to the Re-Load  Option on the date of exercise
of the  original  Option and shall have a term which is no longer  than five (5)
years.

     Any such Re-Load Option may be an Incentive  Stock Option or a Nonstatutory
Stock  Option,  as the Board or Committee may designate at the time of the grant
of the original Option;  provided,  however, that the designation of any Re-Load
Option as an Incentive Stock Option shall be subject to the one hundred thousand
dollar ($100,000) annual limitation on exercisability of Incentive Stock Options
described  in  subsection  11(d) of the Plan and in Section  422(d) of the Code.
There shall be no Re-Load Options on a Re-Load  Option.  Any such Re-Load Option
shall be subject to the availability of sufficient  shares under subsection 4(a)
and  shall be  subject  to such  other  terms  and  conditions  as the  Board or
Committee may determine which are not inconsistent  with the express  provisions
of the Plan regarding the terms of Options.

                                      E-7
<PAGE>

7.       Terms Of Stock Bonuses And Purchases Of Restricted Stock.

     Each stock bonus or restricted  stock purchase  agreement  shall be in such
form and shall  contain such terms and  conditions as the Board or the Committee
shall deem  appropriate.  The terms and  conditions of stock bonus or restricted
stock  purchase  agreements  may  change  from  time to time,  and the terms and
conditions of separate agreements need not be identical, but each stock bonus or
restricted  stock purchase  agreement shall include  (through  incorporation  of
provisions  hereof by reference in the agreement or otherwise)  the substance of
each of the following provisions as appropriate:

     (a) Purchase Price. The purchase price under each restricted stock purchase
agreement  shall be such amount as the Board or Committee  shall  determine  and
designate  in such  agreement.  In any  event,  the Board or the  Committee  may
determine that eligible  participants  in the Plan may be awarded stock pursuant
to a stock bonus agreement in consideration  for past services actually rendered
to the Company or for its benefit.

     (b)  Transferability.  No rights  under a stock bonus or  restricted  stock
purchase  agreement shall be transferable  except by will or the laws of descent
and  distribution  or pursuant to a domestic  relations  order, so long as stock
awarded under such agreement remains subject to the terms of the agreement.

     (c) Consideration. The purchase price of stock acquired pursuant to a stock
purchase  agreement  shall be paid either:  (i) in cash at the time of purchase;
(ii) at the  discretion of the Board or the  Committee,  according to a deferred
payment or other arrangement with the person to whom the stock is sold; or (iii)
in any other form of legal  consideration that may be acceptable to the Board or
the Committee in their discretion.  Notwithstanding the foregoing,  the Board or
the Committee to which  administration  of the Plan has been delegated may award
stock  pursuant to a stock bonus  agreement in  consideration  for past services
actually rendered to the Company or for its benefit.

     (d) Vesting.  Shares of stock sold or awarded  under the Plan may, but need
not, be subject to a  repurchase  option in favor of the  Company in  accordance
with a vesting schedule to be determined by the Board or the Committee.

     (e)  Termination of Employment or Relationship as a Director or Consultant.
In the event a  Participant"s  Continuous  Status as an  Employee,  Director  or
Consultant  terminates,  the  Company may  repurchase  or  otherwise  reacquire,
subject to the  limitations  described  in  subsection  7(d),  any or all of the
shares of stock  held by that  person  which  have not  vested as of the date of
termination  under the terms of the stock  bonus or  restricted  stock  purchase
agreement between the Company and such person.

8.       Cancellation And Re-Grant Of Options.

     (a) The Board or the Committee  shall have the authority to effect,  at any
time and from time to time, (i) the repricing of any  outstanding  Options under
the Plan and/or (ii) with the consent of the  affected  holders of Options,  the
cancellation  of any  outstanding  Options  under  the  Plan  and the  grant  in
substitution  therefor  of new  Options  under  the  Plan  covering  the same or
different numbers of shares of stock, but having an exercise price per share not
less than  eighty-five  percent  (85%) of the Fair  Market  Value  (one  hundred
percent  (100%)  of the Fair  Market  Value in the  case of an  Incentive  Stock
Option) or, in the case of an Option granted to a 10%  shareholder (as described
in subsection  5(b)),  not less than one hundred ten percent  (110%) of the Fair
Market  Value)  per share of stock on the new grant  date.  Notwithstanding  the
foregoing, the Board or the Committee may grant an Option with an exercise price
lower than that set forth
                                      E-8
<PAGE>

above if such Option is granted as part of a transaction to which section 424(a)
of the Code applies.

     (b) Shares  subject to an Option  which is amended or  canceled  under this
Section 8 in order to set a lower  exercise price per share shall continue to be
counted against the maximum award of Options permitted to be granted pursuant to
subsection 5(c). The repricing of an Option under this Section 8, resulting in a
reduction of the exercise  price,  shall be deemed to be a  cancellation  of the
original  Option  and the  grant of a  substitute  Option  in the  event of such
repricing,  both the  original  and the  substituted  Options  shall be  counted
against any such maximum awards of Options.  The  provisions of this  subsection
8(b) shall be applicable  only to the extent  required by Section  162(m) of the
Code.

9.       Covenants Of The Company.

     (a) During the terms of the Stock Awards,  the Company shall keep available
at all times  the  number of shares of stock  required  to  satisfy  such  Stock
Awards.

     (b) The Company  shall seek to obtain from each  regulatory  commission  or
agency having  jurisdiction  over the Plan such  authority as may be required to
issue and sell  shares of stock  upon  exercise  of the Stock  Award;  provided,
however,  that this undertaking  shall not require the Company to register under
the Securities Act of 1933, as amended (the  "Securities  Act") either the Plan,
any Stock  Award or any stock  issued or  issuable  pursuant  to any such  Stock
Award.  If, after reasonable  efforts,  the Company is unable to obtain from any
such regulatory commission or agency the authority which counsel for the Company
deems  necessary for the lawful  issuance and sale of stock under the Plan,  the
Company shall be relieved from any liability for failure to issue and sell stock
upon exercise of such Stock Awards unless and until such authority is obtained.

10.      Use Of Proceeds From Stock.

     Proceeds from the sale of stock  pursuant to Stock Awards shall  constitute
general funds of the Company.

11.      Miscellaneous.

     (a) The Board shall have the power to accelerate  the time at which a Stock
Award may first be  exercised or the time during which a Stock Award or any part
thereof  will vest  pursuant to  subsection  6(e) or 7(d),  notwithstanding  the
provisions  in the  Stock  Award  stating  the  time at  which  it may  first be
exercised or the time during which it will vest.

     (b) No Employee, Director or Consultant or any person to whom a Stock Award
is transferred  under  subsection 6(d) or 7(b), shall be deemed to be the holder
of, or to have any of the rights of a holder with respect to, any shares subject
to such Stock Award unless and until such person has satisfied all  requirements
for exercise of the Stock Award pursuant to its terms.

     (c) Nothing in the Plan or any  instrument  executed or Stock Award granted
pursuant thereto shall confer upon any Employee,  Director,  Consultant or other
holder of Stock Awards any right to continue in the employ of the Company or any
Affiliate (or to continue  acting as a Director or  Consultant)  or shall affect
(i) the right of the Company or any Affiliate to terminate the employment of any
Employee  with or  without  cause,  (ii)  the  right of the  Company's  Board of
Directors and/or the Company's  shareholders to remove any Director  pursuant to
the  terms  of the  Company's  By-Laws  and  the  provisions  of the  California
Corporations  Code,  or (iii) the right to  terminate  the  relationship  of any
Consultant pursuant to the terms of such Consultant's agreement with the Company
or Affiliate.
                                      E-9

<PAGE>

     (d) To the extent that the aggregate  Fair Market Value  (determined at the
time of grant) of stock  with  respect  to which  Incentive  Stock  Options  are
exercisable  for the first time by any Optionee  during any calendar  year under
all plans of the Company and its Affiliates exceeds one hundred thousand dollars
($100,000),  the Options or portions  thereof which exceed such limit (according
to the order in which they were granted) shall be treated as Nonstatutory  Stock
Options.

     (e) The Company may require any person to whom a Stock Award is granted, or
any person to whom a Stock Award is transferred  pursuant to subsection  6(d) or
7(b), as a condition of exercising or acquiring stock under any Stock Award, (1)
to give  written  assurances  satisfactory  to the  Company as to such  person's
knowledge and  experience in financial and business  matters  and/or to employ a
purchaser   representative   reasonably  satisfactory  to  the  Company  who  is
knowledgeable and experienced in financial and business matters,  and that he or
she  is  capable  of   evaluating,   alone  or  together   with  the   purchaser
representative,  the merits and risks of exercising the Stock Award;  and (2) to
give written assurances  satisfactory to the Company stating that such person is
acquiring the stock subject to the Stock Award for such person's own account and
not with any present  intention of selling or otherwise  distributing the stock.
The  foregoing   requirements,   and  any  assurances  given  pursuant  to  such
requirements,  shall be  inoperative  if (i) the issuance of the shares upon the
exercise or acquisition of stock under the Stock Award has been registered under
a then currently effective  registration  statement under the Securities Act, or
(ii) as to any particular  requirement,  a determination  is made by counsel for
the Company that such requirement need not be met in the circumstances under the
then applicable securities laws. The Company may require the Optionee to provide
such other representations,  written assurances or information which the Company
shall determine is necessary, desirable or appropriate to comply with applicable
securities  and other laws as a condition of granting an Option to such Optionee
or permitting the Optionee to exercise such Option. The Company may, upon advice
of counsel to the Company,  place legends on stock certificates issued under the
Plan as such  counsel  deems  necessary or  appropriate  in order to comply with
applicable securities laws,  including,  but not limited to, legends restricting
the transfer of the stock.

     (f) To the extent  provided  by the terms of a Stock Award  Agreement,  the
person to whom a Stock Award is granted may satisfy any federal,  state or local
tax  withholding  obligation  relating to the exercise or  acquisition  of stock
under a Stock Award by any of the following  means or by a  combination  of such
means:  (1) tendering a cash payment;  (2)  authorizing  the Company to withhold
shares from the shares of the common stock otherwise issuable to the participant
as a result of the exercise or  acquisition  of stock under the Stock Award;  or
(3) delivering to the Company owned and unencumbered  shares of the common stock
of the  Company.Prior  to the Listing  Date,  to the extent  required by Section
260.140.46 of Title 10 of the California Code of Regulations,  the Company shall
deliver  financial  statements  to persons to whom Stock  Awards were granted at
least  annually.  This  subsection  10(g) shall not apply to key Employees whose
duties  in  connection  with  the  Company  assure  them  access  to  equivalent
information.

12.      Adjustments Upon Changes In Stock.

     (a) If any change is made in the stock  subject to the Plan,  or subject to
any Stock Award,  without the receipt of  consideration  by the Company (through
merger, consolidation, reorganization, recapitalization,  reincorporation, stock
dividend,  dividend  in  property  other than  cash,  stock  split,  liquidating
dividend,  combination  of  shares,  exchange  of  shares,  change in  corporate
structure or other transaction not involving the receipt of consideration by the
Company),  the Plan will be appropriately  adjusted in the class(es) and maximum
number
                                      E-10
<PAGE>
of shares  subject to the Plan pursuant to subsection  4(a),  the maximum annual
award  pursuant to subsection  5(c),  and the  outstanding  Stock Awards will be
appropriately adjusted in the class(es) and number of shares and price per share
of stock subject to such outstanding  Stock Awards.  Such  adjustments  shall be
made by the Board or the Committee,  the  determination of which shall be final,
binding and conclusive.  (The  conversion of any  convertible  securities of the
Company  shall not be treated as a  "transaction  not  involving  the receipt of
consideration by the Company.")

     (b) In the  event  of:  (1) a  dissolution,  liquidation  or sale of all or
substantially all of the assets of the Company; (2) a merger or consolidation in
which the  Company is not the  surviving  corporation;  (3) a reverse  merger in
which the Company is the surviving  corporation  but the shares of the Company's
common  stock  outstanding  immediately  preceding  the merger are  converted by
virtue of the merger  into other  property,  whether in the form of  securities,
cash or otherwise;  or (4) the acquisition by any person, entity or group within
the meaning of Section  13(d) or 14(d) of the  Exchange  Act, or any  comparable
successor  provisions  (excluding  any employee  benefit plan, or related trust,
sponsored or  maintained  by the Company or any Affiliate of the Company) of the
beneficial  ownership  (within the meaning of Rule 13d-3  promulgated  under the
Exchange  Act,  or  comparable  successor  rule) of  securities  of the  Company
representing  at least fifty percent (50%) of the combined voting power entitled
to vote in the election of directors, then to the extent permitted by applicable
law:  (i) any  surviving  or  acquiring  corporation  shall  assume any  Options
outstanding  under the Plan or shall  substitute  similar Options  (including an
option  to  acquire  the  same  consideration  paid to the  shareholders  in the
transaction  described in this subsection 12(b)) for those outstanding under the
Plan, or (ii) such Options shall continue in full force and effect. In the event
any surviving or acquiring  corporation  refuses to assume such  Options,  or to
substitute  similar  options for those  outstanding  under the Plan,  then, with
respect to Options  held by  persons  then  performing  services  as  Employees,
Directors  or  Consultants,  the time during which such Options may be exercised
shall be  accelerated  prior to such  event and the  Options  terminated  if not
exercised after such  acceleration  and at or prior to such event. An Optionee's
Option Agreement may include additional provisions which address the handling of
such option upon the  occurrence of a transaction  described in this  subsection
12(b);  provided,  however, that any such additional provisions shall not impair
or reduce the rights of the Optionee under this subsection 12(b).

13.      Amendment Of The Plan and Stock Awards.

     (a) The  Board at any  time,  and from  time to time,  may  amend the Plan.
However,  except as provided in Section 12 relating to adjustments  upon changes
in stock, no amendment shall be effective unless approved by the shareholders of
the  Company  within  twelve  (12)  months  before or after the  adoption of the
amendment, where the amendment will:
          (i) Increase the number of shares  reserved for Stock Awards under the
     Plan;

          (ii) Modify the  requirements as to eligibility for  participation  in
     the Plan (to the extent such modification  requires shareholder approval in
     order for the Plan to satisfy the requirements of Section 422 of the Code);
     or

          (iii) Modify the Plan in any other way if such  modification  requires
     shareholder  approval in order for the Plan to satisfy the  requirements of
     Section 422 of the Code, comply with the requirements of Rule 16b-3, or any
     Nasdaq or securities exchange requirements.

     (b) The Board may in its sole discretion  submit any other amendment to the
Plan for shareholder approval,  including, but not limited to, amendments to the
Plan intended to satisfy the  requirements of Section 162(m) of the Code and the
regulations  promulgated thereunder regarding the exclusion of performance-based
compensation  from the limit on corporate  deductibility of compensation paid to
certain executive officers.
                                      E-11
<PAGE>
     (c) It is expressly  contemplated  that the Board may amend the Plan in any
respect the Board deems necessary or advisable to provide eligible  Employees or
Consultants  with the maximum  benefits  provided  or to be  provided  under the
provisions of the Code and the regulations  promulgated  thereunder  relating to
Incentive Stock Options and/or to bring the Plan and/or  Incentive Stock Options
granted under it into compliance  therewith.  Rights and  obligations  under any
Stock Award  granted  before  amendment of the Plan shall not be impaired by any
amendment of the Plan unless (i) the Company  requests the consent of the person
to whom the Stock Award was granted and (ii) such person consents in writing.

     (d) The  Board at any time,  and from time to time,  may amend the terms of
any one or more Stock Award; provided,  however, that the rights and obligations
under any Stock Award shall not be impaired by any such amendment unless (i) the
Company  requests  the consent of the person to whom the Stock Award was granted
and (ii) such person consents in writing.

14.      Termination Or Suspension Of The Plan.

     (a) The Board may suspend or terminate the Plan at any time.  Unless sooner
terminated, the Plan shall terminate on November 14, 2005, which shall be within
ten (10) years from the date the Plan is adopted by the Board or approved by the
shareholders  of the  Company,  whichever  is  earlier.  No Stock  Awards may be
granted under the Plan while the Plan is suspended or after it is terminated.

     (b) Rights and obligations  under any Stock Award granted while the Plan is
in effect shall not be impaired by suspension or termination of the Plan, except
with the consent of the person to whom the Stock Award was granted.

15.      Effective Date Of Plan.

     The Plan shall become  effective  upon adoption by the Board,  but no Stock
Awards  granted under the Plan shall be exercised  unless and until the Plan has
been approved by the shareholders of the Company, which approval shall be within
twelve (12) months before or after the date the Plan is adopted by the Board.

                                      E-12
<PAGE>

                             INCENTIVE STOCK OPTION


___________________, Optionee:

     Castelle (the  "Company"),  pursuant to its 1988 Equity Incentive Plan (the
"Plan"),  has this day granted to you,  the optionee  named above,  an option to
purchase shares of the common stock of the Company ("Common Stock"). This option
is  intended to qualify as an  "incentive  stock  option"  within the meaning of
Section 422 of the Internal Revenue Code of 1986, as amended (the "Code").

     The  grant  hereunder  is in  connection  with  and in  furtherance  of the
Company's compensatory benefit plan for participation of the Company's employees
(including officers), directors and consultants.

     The details of your option are as follows:

     The  total  number  of  shares  of  Common  Stock  subject  to this  option
is_______________.  Subject to the limitations  contained  herein,________of the
shares will vest (become  exercisable)  on______________and  ____________ of the
shares  will then vest  each  month  thereafter  until  either  (i) you cease to
provide  services to the Company  for any  reason,  or (ii) this option  becomes
fully vested.

     The exercise price of this option  is__________________________  per share,
being not less than the fair  market  value of the  Common  Stock on the date of
grant of this option.

          Payment of the exercise  price per share is due in full upon  exercise
     of all or any part of each  installment  which has accrued to you.  You may
     elect, to the extent permitted by applicable  statutes and regulations,  to
     make payment of the exercise price under one of the following alternatives:



               Payment of the exercise price per share in cash (including check)
          at the time of exercise;



               Payment  pursuant to a program  developed  under  Regulation T as
          promulgated by the Federal  Reserve Board which results in the receipt
          of cash (or  check) by the  Company  prior to the  issuance  of Common
          Stock;



               Provided that at the time of exercise the Company's  Common Stock
          is publicly  traded and quoted  regularly in the Wall Street  Journal,
          payment by delivery of already-owned  shares of Common Stock, held for
          the  period  required  to avoid a  charge  to the  Company's  reported
          earnings, and owned free and clear of any liens, claims,  encumbrances
          or security interests,  which Common Stock shall be valued at its fair
          market value on the date of exercise;



          Payment  by a  combination  of the  methods of  payment  permitted  by
     subparagraph 2(b)(i) through 2(b)(iii) above.

          This option may only be exercised for whole shares.
                                      E-13
<PAGE>


     Notwithstanding  anything to the contrary contained herein, this option may
not be exercised  unless the shares  issuable  upon  exercise of this option are
then registered under the Securities Act of 1933, as amended (the "Act"), or, if
such shares are not then so  registered,  the Company has  determined  that such
exercise and issuance would be exempt from the registration  requirements of the
Act.

     The term of this option  commences  on__________,  2000,  the date of grant
and,  unless  sooner  terminated  as set forth below or in the Plan,  terminates
on__________,  2007.  In no event may this option be  exercised  on or after the
date on which it terminates. This option shall terminate prior to the expiration
of its  term  as  follows:  three  (3)  months  after  the  termination  of your
employment  with the Company or an  affiliate  of the Company (as defined in the
Plan) unless one of the following circumstances exists:

     Your  termination  of  employment  is  due  to  your  permanent  and  total
disability  (within the meaning of Section  422(c)(6) of the Code).  This option
will then  terminate on the earlier of the  termination  date set forth above or
twelve (12) months following such termination of employment.


     Your termination of employment is due to your death.  This option will then
terminate  on the  earlier of the  termination  date set forth above or eighteen
(18) months after your death.


     If during any part of such three (3)-month period you may not exercise your
option solely because of the condition set forth in paragraph 4 above, then your
option will not terminate  until the earlier of the  termination  date set forth
above or until this option shall have been  exercisable for an aggregate  period
of three (3) months after your termination of employment.


     If your exercise of the option within three (3) months after termination of
your  employment with the Company or with an affiliate would result in liability
under section  16(b) of the  Securities  Exchange Act of 1934,  then your option
will  terminate  on the  earlier of (i) the  termination  date set forth  above,
(ii) the  tenth (10th) day after the last date upon which  exercise would result
in  such  liability  or  (iii) six  (6)  months  and ten  (10)  days  after  the
termination of your employment with the Company or an affiliate.


     However,  this option may be exercised following  termination of employment
only as to that number of shares as to which it was  exercisable  on the date of
termination of employment under the provisions of paragraph 1 of this option.

     In order to obtain the federal  income tax  advantages  associated  with an
"incentive  stock option," the Code requires that at all times  beginning on the
date of grant of the option  and  ending on the day three (3) months  before the
date of the  option's  exercise,  you must be an  employee  of the Company or an
affiliate,  except in the event of your death or permanent and total disability.
The Company has provided for  continued  vesting or extended  exercisability  of
your option under certain  circumstances for your benefit,  but cannot guarantee
that your option will  necessarily be treated as an "incentive  stock option" if
you provide  services to the Company or an affiliate as a consultant or exercise
your option more than three (3) months after the date your  employment  with the
Company and all affiliates terminates.
                                      E-14
<PAGE>
     This option may be exercised,  to the extent specified above, by delivering
a notice of exercise (in a form  designated  by the Company)  together  with the
exercise  price to the Secretary of the Company,  or to such other person as the
Company  may  designate,  during  regular  business  hours,  together  with such
additional  documents as the Company may then require  pursuant to  subparagraph
11(f) of the Plan.

     By exercising this option you agree that:


          the Company may require you to enter an arrangement  providing for the
     payment by you to the  Company  of any tax  withholding  obligation  of the
     Company arising by reason of (1) the exercise of this option; (2)the lapse
     of any  substantial  risk of  forfeiture to which the shares are subject at
     the time of exercise;  or (3) the  disposition of shares acquired upon such
     exercise;


          you will notify the Company in writing  within fifteen (15) days after
     the date of any disposition of any of the shares of the Common Stock issued
     upon  exercise of this  option  that occurs  within two (2) years after the
     date of this  option  grant or within  one (1) year  after  such  shares of
     Common Stock are transferred upon exercise of this option; and

     This option is not  transferable,  except by will or by the laws of descent
and   distribution,   and  is   exercisable   during  your  life  only  by  you.
Notwithstanding the foregoing, by delivering written notice to the Company, in a
form  satisfactory  to the Company,  you may designate a third party who, in the
event of your death, shall thereafter be entitled to exercise this option.  This
option is not an employment  contract and nothing in this option shall be deemed
to create in any way  whatsoever  any obligation on your part to continue in the
employ of the Company,  or of the Company to continue your  employment  with the
Company.  Any notices  provided for in this option or the Plan shall be given in
writing and shall be deemed  effectively  given upon  receipt or, in the case of
notices  delivered  by the  Company to you,  five (5) days after  deposit in the
United States mail,  postage prepaid,  addressed to you at the address specified
below or at such other address as you hereafter  designate by written  notice to
the Company. This option is subject to all the provisions of the Plan, a copy of
which is  attached  hereto and its  provisions  are  hereby  made a part of this
option,  including without  limitation the provisions of paragraph 6 of the Plan
relating to option  provisions,  and is further subject to all  interpretations,
amendments, rules and regulations which may from time to time be promulgated and
adopted  pursuant  to  the  Plan.  In the  event  of any  conflict  between  the
provisions  of this  option and those of the Plan,  the  provisions  of the Plan
shall control.

         Dated the ____ day of __________________, 19__.

                                                     Very truly yours,

                                                     Castelle

                                                     By:________________________
                                                       Duly authorized on behalf
                                                       of the Board of Directors


Attachments:

         Castelle 1988 Equity Incentive Plan
         Notice of Exercise
                                      E-15
<PAGE>

The undersigned:

     Acknowledges receipt of the foregoing option and the attachments referenced
therein and  understands  that all rights and  liabilities  with respect to this
option are set forth in the option and the Plan; and


     Acknowledges that as of the date of grant of this option, it sets forth the
entire  understanding  between the undersigned  optionee and the Company and its
affiliates  regarding the acquisition of stock in the Company and supersedes all
prior oral and written  agreements on that subject with the exception of (i) the
options  previously  granted and delivered to the undersigned under stock option
plans of the Company, and (ii) the following agreements only:


         None ____________
                  (Initial)

         Other__________________________________
              __________________________________
              __________________________________






                                                     ___________________________
                                                     Optionee

                                                     Address:___________________
                                                             ___________________



                                      E-16
<PAGE>

                            NONSTATUTORY STOCK OPTION


_________________________, Optionee:

     Castelle (the  "Company"),  pursuant to its 1988 Equity Incentive Plan (the
"Plan") has this day granted to you,  the  optionee  named  above,  an option to
purchase shares of the common stock of the Company ("Common Stock"). This option
is not  intended  to qualify as and will not be treated as an  "incentive  stock
option" within the meaning of Section 422 of the Internal  Revenue Code of 1986,
as amended (the "Code").

     The  grant  hereunder  is in  connection  with  and in  furtherance  of the
Company's compensatory benefit plan for participation of the Company's employees
(including officers), directors or consultants.

     The details of your option are as follows:

          The total number of shares of Common  Stock  subject to this option is
     ____________________  (__________).  Subject to the  limitations  contained
     herein, of the shares will vest (become exercisable) on ____________,  19__
     and of the shares will then vest each month thereafter until either (i) you
     cease to provide  services  to the  Company  for any  reason,  or (ii) this
     option becomes fully vested.

               The exercise price of this option is  ___________________________
          ($___________)  per share,  being not less than 85% of the fair market
          value of the Common Stock on the date of grant of this option.

                    Payment of the exercise  price per share is due in full upon
               exercise of all or any part of each installment which has accrued
               to you.  You may elect,  to the extent  permitted  by  applicable
               statutes and  regulations,  to make payment of the exercise price
               under one of the following alternatives:



                    Payment of the exercise  price per share in cash  (including
               check) at the time of exercise;



                    Payment pursuant to a program  developed under  Regulation T
               as promulgated by the Federal  Reserve Board which results in the
               receipt of cash (or check) by the Company  prior to the  issuance
               of Common Stock;



                    Provided that at the time of exercise the  Company's  Common
               Stock is publicly traded and quoted  regularly in the Wall Street
               Journal,  payment by delivery of  already-owned  shares of Common
               Stock,  held for the  period  required  to avoid a charge  to the
               Company's  reported  earnings,  and  owned  free and clear of any
               liens, claims,  encumbrances or security interests,  which Common
               Stock  shall be  valued at its fair  market  value on the date of
               exercise;
                                      E-17

<PAGE>


                    Payment by a combination of the methods of payment permitted
               by subparagraph 2(b)(i) through 2(b)(iii) above.


          This option may only be exercised for whole shares.

          Notwithstanding anything to the contrary contained herein, this option
     may not be  exercised  unless the shares  issuable  upon  exercise  of this
     option are then registered under the Act or, if such Shares are not then so
     registered,  the Company has  determined  that such  exercise  and issuance
     would be exempt from the registration requirements of the Act.

          The term of this option  commences on  ___________,  19__, the date of
     grant and,  unless  sooner  terminated  as set forth  below or in the Plan,
     terminates on ___________________. In no event may this option be exercised
     on or after the date on which it  terminates.  This option shall  terminate
     prior to the expiration of its term as follows:  three (3) months after the
     termination  of your  employment  with the Company or an  affiliate  of the
     Company (as defined in the Plan) for any reason or for no reason unless:

               such termination of employment is due to your permanent and total
          disability  (within the meaning of Section  422(c)(6) of the Code), in
          which  event  the  option  shall  terminate  on  the  earlier  of  the
          termination  date set forth above or twelve (12) months following such
          termination of employment; or


               such  termination  of employment  is due to your death,  in which
          event the option  shall  terminate  on the earlier of the  termination
          date set forth above or eighteen (18) months after your death; or


               during any part of such three (3)-month  period the option is not
          exercisable  solely  because of the condition set forth in paragraph 4
          above, in which event the option shall not terminate until the earlier
          of the  termination  date set forth  above or until it shall have been
          exercisable  for an  aggregate  period of three (3)  months  after the
          termination of employment; or


               If your  exercise  of the option  within  three (3) months  after
          termination of your  employment  with the Company or with an affiliate
          would  result  in  liability  under  section  16(b) of the  Securities
          Exchange Act of 1934 (the  "Exchange  Act"),  in which case the option
          will  terminate on the earlier of (i) the  termination  date set forth
          above,  (ii) the  tenth  (10th)  day after  the last  date upon  which
          exercise  would result in such  liability or (iii) six  (6) months and
          ten (10)  days  after  the  termination  of your  employment  with the
          Company or an affiliate.


     However,  this option may be exercised following  termination of employment
only as to that number of shares as to which it was  exercisable  on the date of
termination of employment under the provisions of paragraph 1 of this option.

     This option may be exercised,  to the extent specified above, by delivering
a notice of exercise (in a form  designated  by the Company)  together  with the
exercise  price to the Secretary of the Company,  or to such other person as the
Company  may  designate,  during  regular  business  hours,  together  with such
additional  documents as the Company may then require  pursuant to  subparagraph
11(f) of the Plan.
                                      E-18
<PAGE>

          By  exercising  this option you agree that the Company may require you
     to enter  an  arrangement  providing  for the  cash  payment  by you to the
     Company of any tax withholding  obligation of the Company arising by reason
     of: (1) the exercise of this option;  (2) the lapse of any substantial risk
     of forfeiture  to which the shares are subject at the time of exercise;  or
     (3) the disposition of shares acquired upon such exercise.


     This option is not  transferable,  except by will or by the laws of descent
and distribution or pursuant to a qualified  domestic relations order satisfying
the  requirements  of  Rule  16b-3  of  the  Exchange  Act  (a  "QDRO"),  and is
exercisable  during  your life only by you or a  transferee  pursuant to a QDRO.
Notwithstanding the foregoing, by delivering written notice to the Company, in a
form  satisfactory  to the Company,  you may designate a third party who, in the
event of your death, shall thereafter be entitled to exercise this option.

     This option is not an employment  contract and nothing in this option shall
be  deemed  to  create  in any way  whatsoever  any  obligation  on your part to
continue  in the  employ of the  Company,  or of the  Company to  continue  your
employment with the Company.

     Any  notices  provided  for in this  option  or the Plan  shall be given in
writing and shall be deemed  effectively  given upon  receipt or, in the case of
notices  delivered  by the  Company to you,  five (5) days after  deposit in the
United States mail,  postage prepaid,  addressed to you at the address specified
below or at such other address as you hereafter  designate by written  notice to
the Company.

     This option is subject to all the  provisions  of the Plan, a copy of which
is attached  hereto and its  provisions  are hereby made a part of this  option,
including without  limitation the provisions of paragraph 6 of the Plan relating
to option provisions, and is further subject to all interpretations, amendments,
rules and  regulations  which may from time to time be  promulgated  and adopted
pursuant to the Plan.  In the event of any conflict  between the  provisions  of
this option and those of the Plan, the provisions of the Plan shall control.

         Dated the ____ day of __________________, 19__.

                                                     Very truly yours,

                                                     Castelle


                                                     By:________________________
                                                       Duly authorized on behalf
                                                       of the Board of Directors

Attachments:

         Castelle Equity Incentive Plan
         Notice of Exercise
                                      E-19
<PAGE>

The undersigned:

     Acknowledges receipt of the foregoing option and the attachments referenced
therein and  understands  that all rights and  liabilities  with respect to this
option are set forth in the option and the Plan; and


     Acknowledges that as of the date of grant of this option, it sets forth the
entire  understanding  between the undersigned  optionee and the Company and its
affiliates  regarding the acquisition of stock in the Company and supersedes all
prior oral and written  agreements on that subject with the exception of (i) the
options  previously  granted and delivered to the undersigned under stock option
plans of the Company, and (ii) the following agreements only:


         None_____________
                  (Initial)

         Other_____________________________
              _____________________________
              _____________________________






                                                     ___________________________
                                                     Optionee

                                                     Address:___________________
                                                             ___________________
                                                             ___________________

                                      E-20
<PAGE>

<TABLE> <S> <C>

<ARTICLE>                     5
<LEGEND>
                                                                    Exhibit 27.1


                            CASTELLE AND SUBSIDIARIES
                             Financial Data Schedule

This  schedule  contains  summary  financial   information  extracted  from  the
Company's Financial  Statements for the three month period ending March 31, 2000
included in the  Company's  Form 10-Q filed May 9, 2000 and is  qualified in its
entirety by reference to such statements.
</LEGEND>
<MULTIPLIER>                                               1,000

<S>                                                        <C>
<PERIOD-TYPE>                                              3-MOS
<FISCAL-YEAR-END>                                    DEC-31-2000
<PERIOD-END>                                         MAR-31-2000
<CASH>                                                     4,563
<SECURITIES>                                                   0
<RECEIVABLES>                                              1,410
<ALLOWANCES>                                               (205)
<INVENTORY>                                              1,305
<CURRENT-ASSETS>                                           7,536
<PP&E>                                                     1,591
<DEPRECIATION>                                           (1,269)
<TOTAL-ASSETS>                                             7,928
<CURRENT-LIABILITIES>                                      3,713
<BONDS>                                                        0
                                          0
                                                    0
<COMMON>                                                  29,015
<OTHER-SE>                                                  (54)
<TOTAL-LIABILITY-AND-EQUITY>                               7,928
<SALES>                                                    4,100
<TOTAL-REVENUES>                                           4,100
<CGS>                                                      1,649
<TOTAL-COSTS>                                              1,649
<OTHER-EXPENSES>                                           2,283
<LOSS-PROVISION>                                               0
<INTEREST-EXPENSE>                                           (6)
<INCOME-PRETAX>                                              174
<INCOME-TAX>                                                   6
<INCOME-CONTINUING>                                          168
<DISCONTINUED>                                                 0
<EXTRAORDINARY>                                                0
<CHANGES>                                                      0
<NET-INCOME>                                                 168
<EPS-BASIC>                                               0.04
<EPS-DILUTED>                                               0.03






</TABLE>

                                                                    Exhibit 99.1
FOR IMMEDIATE RELEASE                                             April 27, 2000

CONTACT:          Donald L. Rich, President & CEO             408-496-0474

Castelle Reports First Quarter 2000 Results: Positive $0.03 EPS

SANTA CLARA,  Calif.,  April 27, 2000 - CASTELLE (Nasdaq:  CSTL) today announced
financial results for the first fiscal quarter ended March 31, 2000.

Net sales for the first  quarter  of 2000 were $4.1  million,  compared  to $4.5
million  for the same period in 1999.  This  compares to net sales in the fourth
quarter of 1999 of $3.9 million, an increase of 5.3%.

The  Company  recorded  net income for the first  quarter of 2000 of $168,000 or
earnings of $0.03 per share, on a fully diluted basis, compared to a net loss of
$1.4  million  or a loss of $0.33 per share  for the same  period in 1999.  This
compares to net income in the fourth  quarter of 1999 of $114,000 or earnings of
$0.02 per share, an improvement in earnings of 47%.

The loss in the first quarter of 1999 included an $880,000 reserve primarily for
excess  inventory  related  to the print  server  product  line.  Excluding  the
additional  inventory  reserve,  the net loss for the  period  would  have  been
$531,000, or $0.12 per share.

Donald L. Rich,  President and CEO,  stated,  "We have sustained two quarters of
profitability which were supported by the introduction of an enhanced Fax Server
product line with improved gross margins,  the  implementation of cost reduction
programs and controlled operating expenses. Our cash flow and balance sheet have
continued to improve in the first quarter of 2000.  We have  adjusted  inventory
levels to match customer demand, decreased the average Days Sales Outstanding to
31 and brought current our accounts payable, while maintaining a cash balance of
$4.4  million as of March 31,  2000.  Castelle's  new cost  structure  and sales
channel  strategy  have  allowed  the  Company to better  compete in its current
markets. We are committed to broadening our market opportunity by developing and
introducing additional server appliance products in future quarters."

About Castelle

Founded in 1987, Castelle develops server appliances  providing office messaging
solutions and other shared services.  The company  pioneered server  appliances,
establishing  a benchmark for "plug and play" and  ease-of-use  with its fax and
print server product  families.  Castelle products are installed in the majority
of Fortune 1000 companies and in small and medium-sized  business  worldwide and
are  available  through  a  worldwide   network  of  distributors,   value-added
resellers,   e-commerce   retailers,   and  systems  integrators.   Castelle  is
headquartered  in  Santa  Clara  and  can  be  reached  at   408-496-0474,   fax
408-496-0502 or www.castelle.com.

Forward-Looking Statements

This press release  contains  forward-looking  statements that involve risks and
uncertainties,  relating  to the  future  events,  including  the  effect of the
Company's  cost  structure on its business  going forward and the ability of the
Company  to  continue  to (i)  develop  and  introduce  new  products,  (ii)  be
profitable,  (iii) control  operating  expenses,  (iv) maintain proper inventory
levels,  and (iv) keep accounts payable current.  Actual events or the Company's
results  may  differ  materially  from the events or  results  discussed  in the
forward-looking   statements  for  a  number  of  reasons   including,   without
limitation,  the timely development,  acceptance and pricing of new products and
the general  economic  conditions  as they affect the Company's  customers.  The
Company  assumes  no  obligation  to  update  the  forward-looking  information.
Investors  are  referred  to the  full  discussion  of risks  and  uncertainties
associated with  forward-looking  statements contained in the Company's 10-K for
the fiscal year ended December 31, 1999.
                                      E-22


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