3COM CORP
S-8, 1999-03-15
COMPUTER COMMUNICATIONS EQUIPMENT
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          As filed with the Securities and Exchange Commission on March 12, 1999
                                                      Registration No. 333-_____
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                              -------------------
                                    FORM S-8
                             REGISTRATION STATEMENT
                                      Under
                           The Securities Act of 1933
                              -------------------
                                3COM CORPORATION
             (Exact name of Registrant as specified in its charter)
                              -------------------
          Delaware                                             94-2605794
          --------                                             ----------
(State or other jurisdiction of                             (I.R.S. Employer
 incorporation or organization)                           Identification Number)

                                3Com Corporation

                               5400 Bayfront Plaza
                           Santa Clara, CA 95052-8145

               (Address of Principal Executive Offices) (Zip Code)
                              -------------------
                         NBX CORPORATION 1996 STOCK PLAN
                         NBX CORPORATION 1998 STOCK PLAN
                              (Full title of plans)
                              -------------------
                                 Mark D. Michael
                        Senior Vice President, Secretary
                               And General Counsel
                                3Com Corporation
                               5400 Bayfront Plaza
                           Santa Clara, CA 95052-8145
                     (Name and address of agent for service)

                                 (408) 326-5000
          (Telephone number, including area code, of agent for service)
<TABLE>
                                                   CALCULATION OF REGISTRATION FEE
<CAPTION>
====================================================================================================================================
                                                                          Proposed               Proposed
                Title of                                                   Maximum                Maximum
               Securities                          Amount                 Offering               Aggregate            Amount of
                 to be                             to be                  Price Per              Offering            Registration
               Registered                      Registered(1)              Share(2)               Price(2)                Fee
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                            <C>                        <C>                     <C>                    <C>
Common Stock, $0.01 par value,
to be issued under the:

  - NBX Corporation 1996 Stock Plan...         366,512 shares             $   --                  $287,113               $ 80

  - NBX Corporation 1998 Stock Plan...         143,400 shares             $   --                  $208,332               $ 58

         TOTAL                                 509,912 shares                                     $495,445               $138
====================================================================================================================================
<FN>
(1)  This  Registration  Statement  shall  also cover any  additional  shares of
     Common Stock which become  issuable upon exercise of options  granted under
     the NBX  Corporation  1996 Stock Plan and the NBX 1998 Stock Plan by reason
     of any stock  dividend,  stock  split,  recapitalization  or other  similar
     transaction  effected without the receipt of consideration which results in
     an increase in the number of the outstanding shares of Common Stock of 3Com
     Corporation.
(2)  Computed in accordance  with Rule 457(h) under the  Securities Act of 1933,
     as amended,  solely for the purpose of calculating  the  registration  fee.
     Computation based upon the price at which the options may be exercised.
</FN>
</TABLE>


<PAGE>


                                3COM CORPORATION
                       REGISTRATION STATEMENT ON FORM S-8

                                     PART II

                 INFORMATION REQUIRED IN REGISTRATION STATEMENT


Item 3. Incorporation of Documents by Reference

         3Com Corporation (the "Company" or "Registrant") hereby incorporates by
reference in this registration statement the following documents:

         (a) The  Registrant's  Annual  Report on Form 10-K for the fiscal  year
ended May 31, 1998,  filed pursuant to Section 13(a) of the Securities  Exchange
Act of 1934,  as amended (the  "Exchange  Act"),  containing  audited  financial
statements for the Company's latest fiscal year.

         (b) The  Registrant's  Quarterly  Report  on Form  10-Q for the  fiscal
quarters ended August 28, 1998, and November 27, 1998, filed pursuant to Section
13(a) of the Exchange Act.

         (c) The description of the  Registrant's  Common Stock contained in the
Registrant's  Registration Statement on Form 8-A filed under the Exchange Act on
September  18, 1984,  including any amendment or report filed for the purpose of
updating such description.

         (d) The description of certain Common Stock Purchase Rights that at the
present time are  represented by and may only be transferred  with the Company's
Common  Stock,  which  description  is contained in the  Company's  Registration
Statement  on Form 8-A filed with the  Securities  and  Exchange  Commission  on
September  22, 1989  pursuant to the Exchange  Act,  including  any amendment or
report filed for the purpose of updating such description.

         All documents  subsequently  filed by the Company  pursuant to Sections
13(a),  13(c),  14 and  15(d) of the  Exchange  Act,  prior to the  filing  of a
post-effective  amendment to this  registration  statement  indicating  that all
securities  offered hereby have been sold or  deregistering  all securities then
remaining  unsold,  shall be  deemed to be  incorporated  by  reference  in this
registration  statement  and to be a part hereof from the date of filing of such
documents.

Item 4. Description of Securities

         Not applicable.

Item 5. Interests of Named Experts and Counsel

         Not applicable.

                                      II-2

<PAGE>


Item 6. Indemnification of Directors and Officers

         As  permitted by Section 145 of the Delaware  General  Corporation  Law
(the "DGCL"), the Registrant's  Certificate of Incorporation  provides that each
person who is or was or who had  agreed to become a  director  or officer of the
Registrant  or who had  agreed  at the  request  of the  Registrant's  Board  of
Directors  or an officer of the  Registrant  to serve as an employee or agent of
the  Registrant  or  as a  director,  officer,  employee  or  agent  of  another
corporation,  partnership,  joint venture,  trust or other enterprise,  shall be
indemnified  by the  Registrant to the full extent  permitted by the DGCL or any
other applicable  laws. Such Certificate of Incorporation  also provides that no
amendment or repeal of such Certificate shall apply to or have any effect on the
right to indemnification  permitted or authorized thereunder for or with respect
to claims asserted before or after such amendment or repeal arising from acts or
omissions  occurring  in  whole or in part  before  the  effective  date of such
amendment or repeal.

         The Registrant's  Bylaws provide that the Registrant shall indemnify to
the full extent  authorized  by law any person made or  threatened  to be made a
party to an action or a proceeding,  whether criminal, civil,  administrative or
investigative,  by  reason  of the  fact  that he or she  was or is a  director,
officer or employee of the  Registrant or any  predecessor  of the Registrant or
serves or served any other enterprise as a director,  officer or employee at the
request of the Registrant or any predecessor of the Registrant.

         The Registrant  has entered into  indemnification  agreements  with its
directors and certain of its officers.

         The  Registrant  maintains  insurance  on behalf of any person who is a
director or officer  against any loss  arising from any claim  asserted  against
such person and expense incurred by such person in any such capacity, subject to
certain exclusions.

Item 7. Exemption from Registration Claimed

         Not applicable.

Item 8. Exhibits

         4.1      NBX  Corporation  1996 Stock Plan,  and form of agreement used
                  thereunder.

         4.2      NBX  Corporation  1998 Stock Plan,  and form of agreement used
                  thereunder.

         5.1      Opinion  of Wilson  Sonsini  Goodrich  & Rosati,  Professional
                  Corporation, as to legality of securities being registered.

        23.1      Consent of Deloitte & Touche LLP, Independent Auditors.

        23.2      Consent of Grant Thornton LLP, Independent Accountants.

        23.3      Consent  of Wilson  Sonsini  Goodrich  & Rosati,  Professional
                  Corporation (contained in Exhibit 5.1).

        24.1      Power of Attorney (see page II-5).

                                      II-3

<PAGE>


Item 9. Undertakings

         (a) Rule 415 Offering

         The undersigned registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a  post-effective  amendment  to this  registration  statement  to  include  any
material  information  with respect to the plan of  distribution  not previously
disclosed  in  the  registration  statement  or  any  material  change  to  such
information in the registration statement.

         (2) That,  for the  purpose  of  determining  any  liability  under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (3) To remove from registration by means of a post-effective  amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         (b)  Filings   incorporating   subsequent  Exchange  Act  documents  by
reference

         The  undersigned  registrant  hereby  undertakes  that, for purposes of
determining  any liability  under the Securities Act of 1933, each filing of the
registrant's  annual  report  pursuant to section  13(a) or section 15(d) of the
Exchange Act that is  incorporated  by reference in the  registration  statement
shall be deemed to be a new  registration  statement  relating to the securities
offered  therein,  and the  offering  of such  securities  at that time shall be
deemed to be the initial bona fide offering thereof.

         (h)  Request  for   acceleration   of  effective   date  or  filing  of
registration statement on Form S-8

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors,  officers and controlling  persons of
the  registrant  pursuant  to the  provisions  described  in  Item 6  above,  or
otherwise, the registrant has been advised that in the opinion of the Securities
and  Exchange  Commission  such  indemnification  is  against  public  policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for  indemnification  against  such  liabilities  (other than the payment by the
registrant of expenses  incurred or paid by a director,  officer or  controlling
person of the  registrant  in the  successful  defense  of any  action,  suit or
proceeding)  is  asserted by such  director,  officer or  controlling  person in
connection with the securities being registered,  the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

                                      II-4

<PAGE>


                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant,  3Com Corporation,  certifies that it has reasonable  grounds to
believe  that it meets all of the  requirements  for  filing on Form S-8 and has
duly  caused  this  Registration  Statement  to be signed  on its  behalf by the
undersigned,  thereunto duly  authorized,  in the City of Santa Clara,  State of
California, on the 12th day of March, 1999.


                                              3COM CORPORATION

                                              By: /s/ Eric A. Benhamou
                                                  ------------------------------
                                                       Eric A. Benhamou
                                                       Chairman of the Board and
                                                       Chief Executive Officer


                                POWER OF ATTORNEY

         KNOW ALL PERSONS BY THESE  PRESENTS,  that each person whose  signature
appears  below  constitutes  and appoints Eric A.  Benhamou and  Christopher  B.
Paisley, and each of them, acting individually,  as his  attorney-in-fact,  with
full power of substitution,  for him and in any and all capacities,  to sign any
and all  amendments to this  Registration  Statement  (including  post-effective
amendments)  on Form S-8, and to file the same,  with all  exhibits  thereto and
other  documents  in  connection  therewith,  with the  Securities  and Exchange
Commission, hereby ratifying and confirming his signature as it may be signed by
said attorney to any and all amendments to the Registration Statement.

<TABLE>
         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration  Statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.

<CAPTION>
                   Signature                                        Title                                Date
                   ---------                                        -----                                ----
<S>                                              <C>                                                 <C>
/s/ Eric A. Benhamou                             Chairman of the Board and Chief Executive
- ---------------------------------                Officer (Principal Executive Officer)               March 12, 1999
Eric A. Benhamou


/s/ Christopher B. Paisley                       Senior Vice President, Finance and Chief
- ---------------------------------                Financial Officer (Principal Financial and
Christopher B. Paisley                           Accounting Officer)                                March 12, 1999

/s/ James L. Barksdale
- ---------------------------------
James L. Barksdale                               Director                                           March 12, 1999


/s/ Gordon A. Campbell
- ---------------------------------
Gordon A. Campbell                               Director                                           March 12, 1999

                                                       II-5

<PAGE>


/s/ Casey G. Cowell
- ---------------------------------
Casey G. Cowell                                  Director                                           March 12, 1999


/s/ James E. Cowie
- ---------------------------------
James E. Cowie                                   Director                                           March 12, 1999


/s/ David W. Dorman 
- ---------------------------------
David W. Dorman                                  Director                                           March 12, 1999


/s/ Jean-Louis Gassee
- ---------------------------------
Jean-Louis Gassee                                Director                                           March 12, 1999


/s/ Philip C. Kantz
- ---------------------------------
Philip C. Kantz                                  Director                                           March 12, 1999


/s/ Paul G. Yovovich
- ---------------------------------
Paul G. Yovovich                                 Director                                           March 12, 1999


- ---------------------------------
William F. Zuendt                                Director                                           March 12, 1999
</TABLE>

                                                      II-6

<PAGE>


                                3COM CORPORATION
                       REGISTRATION STATEMENT ON FORM S-8

                                INDEX TO EXHIBITS

       Exhibit
        Number                   Description
       -------    -------------------------------------------
         4.1      NBX  Corporation  1996 Stock Plan,  and form of agreement used
                  thereunder.

         4.2      NBX  Corporation  1998 Stock Plan,  and form of agreement used
                  thereunder.

         5.1      Opinion  of Wilson  Sonsini  Goodrich  & Rosati,  Professional
                  Corporation, as to legality of securities being registered.

         23.1     Consent of Deloitte & Touche LLP, Independent Auditors.

         23.2     Consent of Grant Thornton LLP, Independent Accountants.

         23.3     Consent  of Wilson  Sonsini  Goodrich  & Rosati,  Professional
                  Corporation (contained in Exhibit 5.1).

         24.1     Power of Attorney (see page II-5).

                                      II-7




                                   Exhibit 4.1

                                 NBX CORPORATION

                                 1996 STOCK PLAN

                  (As Amended and Restated on January 27, 1998)


         1.  Purpose.  The purpose of the NBX  Corporation  1996 Stock Plan (the
"Plan") is to encourage key employees of NBX Corporation  (the "Company") and of
any  present  or  future  parent or  subsidiary  of the  Company  (collectively,
"Related Corporations") and other individuals who render services to the Company
or a Related  Corporation,  by providing  opportunities  to  participate  in the
ownership of the Company and its future growth  through (a) the grant of options
which qualify as "incentive stock options"  ("ISOs") under Section 422(b) of the
Internal Revenue Code of 1986, as amended (the "Code"); (b) the grant of options
which do not qualify as ISOs ("Non-Qualified  Options");  (c) awards of stock in
the Company ("Awards");  and (d) opportunities to make direct purchases of stock
in the Company  ("Purchases").  Both ISOs and Non-Qualified Options are referred
to hereafter individually as an "Option" and collectively as "Options." Options,
Awards  and   authorizations   to  make  Purchases  are  referred  to  hereafter
collectively  as  "Stock  Rights."  As  used  herein,  the  terms  "parent"  and
"subsidiary"   mean   "parent   corporation"   and   "subsidiary   corporation,"
respectively, as those terms are defined in Section 424 of the Code.

         2. Administration of the Plan.

                  A.  Board  or  Committee  Administration.  The  Plan  shall be
         administered by the Board of Directors of the Company (the "Board") or,
         subject to Paragraph 2D (relating to compliance  with Section 162(m) of
         the Code),  by a committee  appointed  by the Board (the  "Committee").
         Hereinafter,  all references in this Plan to the "Committee" shall mean
         the Board if no Committee has been  appointed.  Subject to ratification
         of the grant or  authorization  of each Stock Right by the Board (if so
         required  by  applicable  state  law),  and subject to the terms of the
         Plan,  the Committee  shall have the authority to (i) determine to whom
         (from  among the  class of  employees  eligible  under  paragraph  3 to
         receive ISOs) ISOs shall be granted,  and to whom (from among the class
         of  individuals  and  entities  eligible  under  paragraph 3 to receive
         Non-Qualified  Options and Awards and to make Purchases)  Non-Qualified
         Options,  Awards and  authorizations  to make Purchases may be granted;
         (ii)  determine  the time or times at which  Options or Awards shall be
         granted or Purchases made; (iii) determine the purchase price of shares
         subject to each Option or Purchase, which prices shall not be less than
         the minimum price specified in paragraph 6; (iv) determine whether each
         Option granted shall be an ISO or a Non-Qualified Option; (v) determine
         (subject  to  paragraph  7) the time or times  when each  Option  shall
         become exercisable and the duration of the exercise period; (vi) extend
         the period during which  outstanding  Options may be  exercised;  (vii)
         determine  whether  restrictions  such as repurchase  options are to be
         imposed on shares  subject to  Options,  Awards and  Purchases  and the
         nature of such restrictions,  if any, and (viii) interpret the Plan and
         prescribe  and  rescind  rules and  regulations  relating to it. If the
         Committee  determines to issue a  Non-Qualified  Option,  it shall take
         whatever actions it deems necessary,  under Section 422 of the Code and
         the regulations promulgated  thereunder,  to ensure that such Option is
         not  treated as an ISO.  The  interpretation  and  construction  by the
         Committee of any  provisions  of the Plan or of any Stock Right granted
         under it shall be final unless  otherwise  determined by the Board. The
         Committee  may from time to time adopt such rules and  regulations  for
         carrying out the Plan as it may deem advisable. No



<PAGE>


         member of the Board or the Committee  shall be liable for any action or
         determination  made in good faith with respect to the Plan or any Stock
         Right granted under it.

                  B.  Committee  Actions.  The  Committee  may select one of its
         members  as its  chairman,  and shall  hold  meetings  at such time and
         places  as  it  may  determine.  A  majority  of  the  Committee  shall
         constitute  a  quorum  and acts of a  majority  of the  members  of the
         Committee at a meeting at which a quorum is present, or acts reduced to
         or  approved  in  writing  by all  the  members  of the  Committee  (if
         consistent with applicable  state law),  shall be the valid acts of the
         Committee.  From time to time the Board  may  increase  the size of the
         Committee and appoint additional members thereof,  remove members (with
         or without  cause) and appoint new  members in  substitution  therefor,
         fill vacancies  however caused,  or remove all members of the Committee
         and thereafter directly administer the Plan.

                  C. Grant of Stock Rights to Board Members. Stock Rights may be
         granted to members of the Board.  All grants of Stock Rights to members
         of the  Board  shall in all  respects  be made in  accordance  with the
         provisions of this Plan applicable to other eligible  persons.  Members
         of the Board who either  (i) are  eligible  to receive  grants of Stock
         Rights  pursuant to the Plan or (ii) have been granted Stock Rights may
         vote on any matters  affecting  the  administration  of the Plan or the
         grant of any Stock  Rights  pursuant  to the Plan,  except that no such
         member  shall act upon the  granting  to  himself  or  herself of Stock
         Rights, but any such member may be counted in determining the existence
         of a quorum at any meeting of the Board  during  which  action is taken
         with respect to the granting to such member of Stock Rights.

                  D.   Performance-Based   Compensation.   The  Board,   in  its
         discretion,  may take such  action as may be  necessary  to ensure that
         Stock   Rights   granted   under  the  Plan   qualify   as   "qualified
         performance-based compensation" within the meaning of Section 162(m) of
         the   Code   and   applicable   regulations    promulgated   thereunder
         ("Performance-Based  Compensation").  Such action may  include,  in the
         Board's  discretion,  some  or all of the  following  (i) if the  Board
         determines  that Stock Rights  granted under the Plan  generally  shall
         constitute   Performance-Based   Compensation,   the   Plan   shall  be
         administered,   to  the  extent  required  for  such  Stock  Rights  to
         constitute  Performance-Based  Compensation,  by a Committee consisting
         solely of two or more  "outside  directors"  (as defined in  applicable
         regulations  promulgated under Section 162(m) of the Code), (ii) if any
         Non-Qualified  Options with an exercise price less than the fair market
         value  per share of Common  Stock  are  granted  under the Plan and the
         Board determines that such Options should constitute  Performance-Based
         Compensation,  such  options  shall be made  exercisable  only upon the
         attainment of a pre-established, objective performance goal established
         by the  Committee,  and such grant shall be submitted for, and shall be
         contingent  upon  shareholder  approval and (iii) Stock Rights  granted
         under the Plan may be subject to such other terms and conditions as are
         necessary for  compensation  recognized in connection with the exercise
         or disposition  of such Stock Right or the  disposition of Common Stock
         acquired pursuant to such Stock Right, to constitute  Performance-Based
         Compensation.

         3. Eligible Employees and Others. ISOs may be granted only to employees
of the Company or any Related  Corporation.  Non-Qualified  Options,  Awards and
authorizations  to make  Purchases  may be granted to any  employee,  officer or
director  (whether or not also an employee) or  consultant of the Company or any
Related  Corporation.  The Committee may take into  consideration  a recipient's
individual  circumstances  in  determining  whether to grant a Stock Right.  The
granting of any Stock Right to any

                                      -2-

<PAGE>


individual  or entity shall  neither  entitle that  individual or entity to, nor
disqualify such individual or entity from,  participation  in any other grant of
Stock Rights.

         4. Stock.  The stock  subject to Stock Rights shall be  authorized  but
unissued  shares of Common Stock of the Company,  par value $.001 per share (the
"Common  Stock"),  or shares of Common  Stock  reacquired  by the Company in any
manner.  The aggregate number of shares which may be issued pursuant to the Plan
is 775,000,  subject to  adjustment  as provided in paragraph  13. If any Option
granted under the Plan shall expire or terminate for any reason  without  having
been  exercised in full or shall cease for any reason to be exercisable in whole
or in part or shall be repurchased  by the Company,  the  unpurchased  shares of
Common Stock subject to such Option shall again be available for grants of Stock
Rights under the Plan.

         5. Granting of Stock Rights. Stock Rights may be granted under the Plan
at any time on or after  September 10, 1996 and prior to September 10, 2006. The
date of grant of a Stock Right under the Plan will be the date  specified by the
Committee at the time it grants the Stock Right;  provided,  however,  that such
date shall not be prior to the date on which the  Committee  acts to approve the
grant.

         6. Minimum Option Price; ISO Limitations.

                  A. Price for  Non-Qualified  Options,  Awards  and  Purchases.
         Subject to Paragraph 2D (relating to compliance  with Section 162(m) of
         the Code),  the exercise  price per share  specified  in the  agreement
         relating to each Non-Qualified  Option granted,  and the purchase price
         per share of stock  granted in any Award or  authorized  as a Purchase,
         under the Plan may be less  than the fair  market  value of the  Common
         Stock of the Company on the date of grant;  provided  that, in no event
         shall  such  exercise  price or such  purchase  price be less  than the
         minimum legal  consideration  required  therefor  under the laws of any
         jurisdiction  in which the Company or its successors in interest may be
         organized.

                  B. Price for ISOs. The exercise  price per share  specified in
         the agreement  relating to each ISO granted under the Plan shall not be
         less than the fair market  value per share of Common  Stock on the date
         of such  grant.  In the  case of an ISO to be  granted  to an  employee
         owning  stock  possessing  more  than ten  percent  (10%) of the  total
         combined  voting  power of all  classes of stock of the  Company or any
         Related  Corporation,  the price per share  specified in the  agreement
         relating  to such ISO shall not be less than one  hundred  ten  percent
         (110%) of the fair market  value per share of Common  Stock on the date
         of grant.  For  purposes  of  determining  stock  ownership  under this
         paragraph,  the rules of Section  424(d) of the Code shall  apply.  The
         date of grant for  purposes  of this  subparagraph  shall mean the date
         that the Company or Related Corporation  completes the corporate action
         constituting an offer of stock for sale to an individual.

                  C. $100,000  Annual  Limitation on ISO Vesting.  Each eligible
         employee  may be  granted  Options  treated  as ISOs only to the extent
         that, in the aggregate  under this Plan and all incentive  stock option
         plans of the Company and any  Related  Corporation,  ISOs do not become
         exercisable  for the first time by such  employee  during any  calendar
         year with respect to stock having a fair market  value  (determined  at
         the time the ISOs were  granted)  in excess of  $100,000.  The  Company
         intends to designate any Options  granted in excess of such  limitation
         as  Non-Qualified   Options,  and  the  Company  shall  issue  separate
         certificates   to  the  optionee  with  respect  to  Options  that  are
         Non-Qualified Options and Options that are ISOs.

                                      -3-

<PAGE>


                  D.  Determination  of Fair  Market  Value.  If, at the time an
         Option is  granted  under  the  Plan,  the  Company's  Common  Stock is
         publicly traded, "fair market value" shall be determined as of the date
         of grant or, if the prices or quotes  discussed  in this  sentence  are
         unavailable  for such date, the last business day for which such prices
         or quotes are  available  prior to the date of grant and shall mean (i)
         the  average  (on that  date) of the high and low  prices of the Common
         Stock on the principal national securities exchange on which the Common
         Stock is  traded,  if the  Common  Stock is then  traded on a  national
         securities  exchange;  or (ii) the last  reported  sale  price (on that
         date) of the Common Stock on the Nasdaq National Market,  if the Common
         Stock is not then traded on a national  securities  exchange;  or (iii)
         the closing  bid price (or average of bid prices)  last quoted (on that
         date)  by  an  established   quotation  service  for   over-the-counter
         securities,  if the Common Stock is not reported on the Nasdaq National
         Market.  If the  Common  Stock is not  publicly  traded  at the time an
         Option is granted  under the Plan,  "fair market  value" shall mean the
         fair value of the Common Stock as  determined  by the  Committee  after
         taking  into  consideration  all  factors  which it deems  appropriate,
         including,  without  limitation,  recent  sale and offer  prices of the
         Common Stock in private transactions negotiated at arm's length.

         7.  Option  Duration.  Subject to earlier  termination  as  provided in
paragraphs 9 and 10 or in the  agreement  relating to such  Option,  each Option
shall expire on the date specified by the  Committee,  but not more than (i) ten
years  from the date of grant in the case of  Options  generally  and (ii)  five
years from the date of grant in the case of ISOs  granted to an employee  owning
stock  possessing more than ten percent (10%) of the total combined voting power
of all classes of stock of the Company or any Related Corporation, as determined
under paragraph 6(B). Subject to earlier termination as provided in paragraphs 9
and 10,  the term of each  ISO  shall  be the  term  set  forth in the  original
instrument  granting such ISO,  except with respect to any part of such ISO that
is converted into a Non-Qualified Option pursuant to paragraph 16.

         8.  Exercise  of Option.  Subject to the  provisions  of  paragraphs  9
through  12 and  paragraph  21,  each  Option  granted  under the Plan  shall be
exercisable as follows:

                  A. Vesting.  The Option shall either be fully  exercisable  on
         the  date of  grant  or shall  become  exercisable  thereafter  in such
         installments as the Committee may specify.

                  B. Full Vesting of Installments.  Once an installment  becomes
         exercisable,   it  shall  remain   exercisable   until   expiration  or
         termination of the Option, unless otherwise specified by the Committee.

                  C.  Partial  Exercise.  Each  Option  or  installment  may  be
         exercised at any time or from time to time, in whole or in part, for up
         to the  total  number  of  shares  with  respect  to  which  it is then
         exercisable.

                  D. Acceleration of Vesting. The Committee shall have the right
         to  accelerate  the date that any  installment  of any  Option  becomes
         exercisable; provided that the Committee shall not, without the consent
         of  an  optionee,   accelerate  the  permitted  exercise  date  of  any
         installment  of any Option  granted to any  employee as an ISO (and not
         previously  converted into a Non-Qualified Option pursuant to paragraph
         16) if such  acceleration  would violate the annual vesting  limitation
         contained  in Section  422(d) of the Code,  as  described  in paragraph
         6(C).

         9. Termination of Employment.  Unless otherwise  specified in this Plan
or the agreement  relating to such ISO, if an ISO optionee ceases to be employed
by the  Company and all  Related  Corporations

                                      -4-

<PAGE>


other  than by reason of death or  disability  as defined  in  paragraph  10, no
further installments of his or her ISOs shall become exercisable, and his or her
ISOs  shall  terminate  on the  earlier  of (a) three  months  after the date of
termination of his or her employment,  or (b) their specified  expiration dates,
except to the extent that such ISOs (or unexercised  installments  thereof) have
been converted into Non-Qualified Options pursuant to paragraph 16. For purposes
of this paragraph 9, employment shall be considered as continuing  uninterrupted
during any bona fide leave of absence  (such as those  attributable  to illness,
military  obligations or governmental  service) provided that the period of such
leave  does not  exceed 90 days or, if  longer,  any  period  during  which such
optionee's right to reemployment is guaranteed by statute or by contract. A bona
fide leave of absence with the written  approval of the  Committee  shall not be
considered an interruption  of employment  under this paragraph 9, provided that
such  written  approval  contractually  obligates  the  Company  or any  Related
Corporation to continue the employment of the optionee after the approved period
of absence.  ISOs granted  under the Plan shall not be affected by any change of
employment within or among the Company and Related Corporations,  so long as the
optionee continues to be an employee of the Company or any Related  Corporation.
Nothing in the Plan shall be deemed to give any  grantee of any Stock  Right the
right to be  retained  in  employment  or other  service  by the  Company or any
Related Corporation for any period of time.

         10. Death; Disability.

A.       Death.  If an ISO optionee ceases to be employed by the Company and all
         Related  Corporations  by reason of his or her death,  any ISO owned by
         such optionee may be exercised,  to the extent otherwise exercisable on
         the  date  of  death,  by  the  estate,   personal   representative  or
         beneficiary  who has acquired the ISO by will or by the laws of descent
         and  distribution,  until the earlier of (i) the  specified  expiration
         date of the ISO or (ii) 180 days from the date of the optionee's death.

B.       Disability. If an ISO optionee ceases to be employed by the Company and
         all  Related  Corporations  by  reason of his or her  disability,  such
         optionee shall have the right to exercise any ISO held by him or her on
         the date of  termination  of  employment,  for the number of shares for
         which he or she could have exercised it on that date, until the earlier
         of (i) the specified  expiration  date of the ISO or (ii) 180 days from
         the  date of the  termination  of the  optionee's  employment.  For the
         purposes of the Plan, the term  "disability"  shall mean "permanent and
         total  disability"  as defined in Section  22(e)(3)  of the Code or any
         successor statute.

         11.  Assignability.  No ISO shall be assignable or  transferable by the
optionee except by will or by the laws of descent and  distribution,  and during
the lifetime of the optionee shall be exercisable  only by such optionee.  Stock
Rights  other  than ISOs  shall be  transferable  to the extent set forth in the
agreement relating to such Stock Right.

         12.  Terms and  Conditions  of Options.  Options  shall be evidenced by
instruments  (which need not be  identical)  in such forms as the  Committee may
from time to time  approve.  Such  instruments  shall  conform  to the terms and
conditions  set forth in  paragraphs  6 through 11 hereof and may  contain  such
other  provisions as the Committee deems  advisable  which are not  inconsistent
with the Plan,  including  restrictions  applicable  to  shares of Common  Stock
issuable  upon  exercise  of  Options.   The  Committee  may  specify  that  any
Non-Qualified  Option shall be subject to the restrictions set forth herein with
respect to ISOs, or to such other termination and cancellation provisions as the
Committee may  determine.  The Committee may from time to time confer  authority
and responsibility on one or more of its own members and/or one or more officers
of the Company to execute and deliver such  instruments.  The proper officers of
the Company are

                                      -5-

<PAGE>


authorized  and directed to take any and all action  necessary or advisable from
time to time to carry out the terms of such instruments.

         13. Adjustments. Upon the occurrence of any of the following events, an
optionee's  rights with respect to Options  granted to such  optionee  hereunder
shall  be  adjusted  as  hereinafter  provided,  unless  otherwise  specifically
provided in the written  agreement between the optionee and the Company relating
to such Option:

                  A. Stock  Dividends and Stock Splits.  If the shares of Common
         Stock shall be subdivided or combined into a greater or smaller  number
         of shares or if the Company shall issue any shares of Common Stock as a
         stock dividend on its outstanding Common Stock, the number of shares of
         Common  Stock  deliverable  upon  the  exercise  of  Options  shall  be
         appropriately increased or decreased  proportionately,  and appropriate
         adjustments  shall be made in the  purchase  price per share to reflect
         such subdivision, combination or stock dividend.

                  B.  Consolidations  or  Mergers.  If  the  Company  is  to  be
         consolidated  with or acquired by another entity by sale or transfer of
         capital stock or in a merger or other reorganization and as a result of
         such sale or  transfer,  merger or  reorganization  the  holders of the
         outstanding  voting  stock of the  Company  immediately  preceding  the
         consummation of such event,  shall,  immediately  following such event,
         hold,  as a  group,  less  than  a  majority  of  the  combined  voting
         securities of the surviving or successor entity, or by a sale of all or
         substantially  all of the  Company's  assets  or  otherwise  (each,  an
         "Acquisition"),  the  Committee or the board of directors of any entity
         assuming  the  obligations  of the Company  hereunder  (the  "Successor
         Board"),  shall, as to outstanding Options, either (i) make appropriate
         provision for the  continuation  of such Options by  substituting on an
         equitable  basis for the shares then subject to such Options either (a)
         the  consideration  payable with respect to the  outstanding  shares of
         Common Stock in connection with the Acquisition, (b) shares of stock of
         the surviving or successor  corporation or (c) such other securities as
         the Successor Board deems  appropriate,  the fair market value of which
         shall not  materially  exceed  the fair  market  value of the shares of
         Common  Stock  subject  to  such  Options  immediately   preceding  the
         Acquisition; or (ii) upon written notice to the optionees, provide that
         all Options must be exercised,  to the extent then exercisable or to be
         exercisable as a result of the Acquisition or pursuant to paragraph 21,
         within a specified  number of days of the date of such  notice,  at the
         end of which period the Options shall terminate; or (iii) terminate all
         Options in exchange for a cash payment  equal to the excess of the fair
         market value of the shares  subject to such Options (to the extent then
         exercisable  or to be  exercisable  as a result of the  Acquisition  or
         pursuant to paragraph 21) over the exercise price thereof.

                  C.  Recapitalization  or  Reorganization.  In the  event  of a
         recapitalization  or  reorganization  of  the  Company  (other  than  a
         transaction  described  in  subparagraph  B  above)  pursuant  to which
         securities  of the  Company or of another  corporation  are issued with
         respect to the  outstanding  shares of Common  Stock,  an optionee upon
         exercising  an Option  shall be entitled  to receive  for the  purchase
         price  paid upon such  exercise  the  securities  he or she would  have
         received  if  he or  she  had  exercised  such  Option  prior  to  such
         recapitalization or reorganization.

                  D. Modification of ISOs.  Notwithstanding  the foregoing,  any
         adjustments  made pursuant to  subparagraphs  A, B or C with respect to
         ISOs  shall be made only after the  Committee,  after  consulting  with
         counsel for the  Company,  determines  whether such  adjustments  would
         constitute  a  "modification"  of such ISOs (as that term is defined in
         Section 424 of the Code) or would  cause any  adverse tax  consequences
         for the holders of such ISOs.  If the  Committee

                                      -6-

<PAGE>


         determines  that such  adjustments  made  with  respect  to ISOs  would
         constitute  a  modification  of such ISOs or would  cause  adverse  tax
         consequences   to  the  holders,   it  may  refrain  from  making  such
         adjustments.

                  E.  Dissolution or  Liquidation.  In the event of the proposed
         dissolution or  liquidation of the Company,  each Option will terminate
         immediately  prior to the  consummation  of such proposed  action or at
         such  other  time and  subject  to such  other  conditions  as shall be
         determined by the Committee.

                  F.  Issuances  of  Securities.  Except as  expressly  provided
         herein,  no issuance by the Company of shares of stock of any class, or
         securities convertible into shares of stock of any class, shall affect,
         and no adjustment by reason  thereof shall be made with respect to, the
         number or price of shares subject to Options.  No adjustments  shall be
         made for dividends paid in cash or in property other than securities of
         the Company.

                  G.  Fractional  Shares.  No fractional  shares shall be issued
         under the Plan and the optionee  shall receive from the Company cash in
         lieu of such fractional shares.

                  H.  Adjustments.  Upon  the  happening  of any  of the  events
         described in  subparagraphs  A, B or C above,  the class and  aggregate
         number of shares set forth in  paragraph  4 hereof  that are subject to
         Stock Rights which  previously have been or subsequently may be granted
         under the Plan  shall also be  appropriately  adjusted  to reflect  the
         events described in such subparagraphs.  The Committee or the Successor
         Board shall  determine the specific  adjustments  to be made under this
         paragraph 13 and,  subject to paragraph 2, its  determination  shall be
         conclusive.

         14. Means of Exercising  Options. An Option (or any part or installment
thereof)  shall be  exercised  by giving  written  notice to the  Company at its
principal  office  address,  or to such  transfer  agent  as the  Company  shall
designate. Such notice shall identify the Option being exercised and specify the
number of shares as to which such Option is being exercised, accompanied by full
payment of the purchase  price  therefor  either (a) in United States dollars in
cash or by check,  (b) at the discretion of the Committee,  through  delivery of
shares of Common  Stock  having a fair market  value equal as of the date of the
exercise to the cash exercise price of the Option,  (c) at the discretion of the
Committee,  by delivery of the grantee's personal recourse note bearing interest
payable  not less than  annually  at no less than 100% of the lowest  applicable
Federal rate, as defined in Section  1274(d) of the Code,  (d) at the discretion
of the Committee and consistent with applicable law,  through the delivery of an
assignment  to the Company of a sufficient  amount of the proceeds from the sale
of the Common Stock acquired upon exercise of the Option and an authorization to
the broker or selling agent to pay that amount to the Company,  which sale shall
be at  the  participant's  direction  at the  time  of  exercise,  or (e) at the
discretion of the Committee,  by any combination of (a), (b), (c) and (d) above.
If the  Committee  exercises its  discretion  to permit  payment of the exercise
price of an ISO by means of the methods set forth in clauses  (b),  (c),  (d) or
(e) of the preceding sentence,  such discretion shall be exercised in writing at
the time of the grant of the ISO in question.  The holder of an Option shall not
have the rights of a  shareholder  with  respect  to the shares  covered by such
Option until the date of issuance of a stock certificate to such holder for such
shares.  Except as  expressly  provided  above in  paragraph  13 with respect to
changes in capitalization  and stock dividends,  no adjustment shall be made for
dividends  or similar  rights for which the record  date is before the date such
stock certificate is issued.

         15. Term and  Amendment of Plan.  This Plan was adopted by the Board on
September 10, 1996.  The Plan shall expire at the end of the day on September 9,
2006 (except as to Options outstanding on

                                      -7-

<PAGE>


that  date).  The Board may  terminate  or amend the Plan in any  respect at any
time, except that,  without the approval of the stockholders  obtained within 12
months  before or after the Board  adopts a  resolution  authorizing  any of the
following  actions:  (a) the total number of shares that may be issued under the
Plan may not be increased  (except by adjustment  pursuant to paragraph 13); (b)
the provisions of paragraph 3 regarding  eligibility  for grants of ISOs may not
be modified;  (c) the  provisions of paragraph 6(B) regarding the exercise price
at which shares may be offered  pursuant to ISOs may not be modified  (except by
adjustment  pursuant to paragraph 13); and (d) the  expiration  date of the Plan
may not be extended.  Except as otherwise  provided in this  paragraph 15, in no
event may  action of the Board or  stockholders  alter or impair the rights of a
grantee,  without  such  grantee's  consent,  under any Stock  Right  previously
granted to such grantee.

         16.  Modifications  of  ISOs;  Conversion  of ISOs  into  Non-Qualified
Options.  Subject to Paragraph  13D,  without the prior  written  consent of the
holder of an ISO, the Committee shall not alter the terms of such ISO (including
the  means  of  exercising  such  ISO) if such  alteration  would  constitute  a
modification  (within  the  meaning  of  Section  424(h)(3)  of the  Code).  The
Committee,  at the written  request or with the written consent of any optionee,
may in its  discretion  take such  actions as may be  necessary  to convert such
optionee's ISOs (or any  installments or portions of installments  thereof) that
have not been exercised on the date of conversion into Non-Qualified  Options at
any time  prior to the  expiration  of such  ISOs,  regardless  of  whether  the
optionee is an employee of the Company or a Related  Corporation  at the time of
such  conversion.  Such  actions  may  include,  but  shall not be  limited  to,
extending the exercise  period or reducing the exercise price of the appropriate
installments of such ISOs. At the time of such  conversion,  the Committee (with
the consent of the optionee)  may impose such  conditions on the exercise of the
resulting   Non-Qualified  Options  as  the  Committee  in  its  discretion  may
determine,  provided that such conditions  shall not be  inconsistent  with this
Plan. Nothing in the Plan shall be deemed to give any optionee the right to have
such  optionee's  ISOs  converted  into  Non-Qualified   Options,  and  no  such
conversion shall occur until and unless the Committee takes appropriate  action.
Upon the taking of such action, the Company shall issue separate certificates to
the optionee with respect to Options that are Non-Qualified  Options and Options
that are ISOs.

         17. Application Of Funds. The proceeds received by the Company from the
sale of shares  pursuant to Options granted and Purchases  authorized  under the
Plan shall be used for general corporate purposes.

         18. Notice to Company of Disqualifying Disposition. By accepting an ISO
granted under the Plan,  each  optionee  agrees to notify the Company in writing
immediately after such optionee makes a Disqualifying  Disposition (as described
in Sections  421,  422 and 424 of the Code and  regulations  thereunder)  of any
stock  acquired  pursuant to the  exercise  of ISOs  granted  under the Plan.  A
Disqualifying  Disposition is generally any  disposition  occurring on or before
the later of (a) the date two years  following  the date the ISO was  granted or
(b) the date one year following the date the ISO was exercised.

         19.  Withholding  of Additional  Income  Taxes.  Upon the exercise of a
Non-Qualified  Option, the transfer of a Non-Qualified  Stock Option pursuant to
an arm's-length transaction,  the grant of an Award, the making of a Purchase of
Common Stock for less than its fair market value,  the making of a Disqualifying
Disposition  (as defined in paragraph 18), the vesting or transfer of restricted
stock or  securities  acquired on the  exercise of an Option  hereunder,  or the
making  of a  distribution  or  other  payment  with  respect  to such  stock or
securities, the Company may withhold taxes in respect of amounts that constitute
compensation  includible in gross income.  The Committee in its  discretion  may
condition  (i) the exercise of an Option,  (ii) the transfer of a  Non-Qualified
Stock  Option,  (iii) the grant of an Award,  (iv) the making of a  Purchase  of

                                      -8-

<PAGE>


Common  Stock  for less  than its  fair  market  value,  or (v) the  vesting  or
transferability  of  restricted  stock or  securities  acquired by exercising an
Option, on the grantee's making  satisfactory  arrangement for such withholding.
Such  arrangement  may include payment by the grantee in cash or by check of the
amount of the withholding  taxes or, at the discretion of the Committee,  by the
grantee's  delivery of previously held shares of Common Stock or the withholding
from the shares of Common Stock otherwise deliverable upon exercise of an Option
shares  having  an  aggregate  fair  market  value  equal to the  amount of such
withholding taxes.

         20.  Governmental  Regulation.  The  Company's  obligation  to sell and
deliver shares of the Common Stock under this Plan is subject to the approval of
any  governmental  authority  required  in  connection  with the  authorization,
issuance or sale of such shares.

         Government regulations may impose reporting or other obligations on the
Company  with respect to the Plan.  For example,  the Company may be required to
send tax information  statements to employees and former employees that exercise
ISOs under the Plan,  and the Company  may be  required to file tax  information
returns  reporting the income received by grantees of Options in connection with
the Plan.

         21.  Acceleration of Vesting of Option after an Acquisition.  As of the
effective  date of an  Acquisition,  as  defined in  paragraph  13 of this Plan,
one-half  of the Options  granted to the  optionee  that are  unvested as of the
effective date of the  Acquisition  shall become fully vested and exercisable by
the optionee  immediately  prior to the effective date of the  Acquisition.  The
remaining  unvested  Options shall  continue to vest over the remaining  vesting
period on a pro-rata  basis,  with the amount  scheduled to vest on each vesting
date  in the  remaining  vesting  period  reduced  by one  half.  The  foregoing
notwithstanding,  the Board of Directors,  in its sole  discretion,  may require
that the optionee's rights under this paragraph shall be conditioned on approval
by stockholders of the Company in accordance with Section  280G(b)(5)(B)  of the
Code and regulations thereunder.  Notwithstanding the foregoing, no Option shall
become vested and  exercisable  pursuant to this paragraph and no optionee shall
acquire any rights as a result of this paragraph, if the acceleration or vesting
of any such Option would  prevent the Company from  accounting  for a particular
business  combination  as a "pooling  of  interests"  pursuant  to the terms and
conditions of APB 16 and the rules and  regulations  promulgated  thereunder (or
any  successor  rule or  pronouncement)  at any time when the Board of Directors
deems it desirable  to account for such  business  combination  as a "pooling of
interests."

         22.  Governing Law. The validity and  construction  of the Plan and the
instruments evidencing Options shall be governed by the laws of The Commonwealth
of  Massachusetts,  or the laws of any  jurisdiction in which the Company or its
successors in interest may be organized.

                                      -9-

<PAGE>


                                 NBX Corporation

                        Incentive Stock Option Agreement



         NBX Corporation, a Delaware corporation (the "Company"),  hereby grants
as of _________,  ______ to __________ (the "Employee"), an option to purchase a
maximum of _______ shares (the "Option  Shares") of its Common Stock,  $.001 par
value ("Common  Stock"),  at the price of _________  ($_____) per share,  on the
following terms and  conditions:  

         1. Grant Under 1996 Stock Plan. This option is granted  pursuant to and
is  governed  by the  Company's  1996 Stock Plan (the  "Plan")  and,  unless the
context otherwise requires,  terms used herein shall have the same meaning as in
the Plan.  Determinations  made in connection  with this option  pursuant to the
Plan  shall be  governed  by the Plan as it exists  on this  date. 

         2. Grant as  Incentive  Stock  Option;  Other  Options.  This option is
intended  to qualify as an  incentive  stock  option  under  Section  422 of the
Internal  Revenue  Code of 1986,  as amended  (the  "Code").  This  option is in
addition to any other options heretofore or hereafter granted to the Employee by
the Company or any Related Corporation (as defined in the Plan), but a duplicate
original of this  instrument  shall not effect the grant of another  option. 

<TABLE>
         3.  Vesting of Option if  Employment  Continues.  If the  Employee  has
continued  to be  employed  by the  Company or any  Related  Corporation  on the
following  dates, the Employee may exercise this option for the number of shares
of Common Stock set opposite the applicable date:
<CAPTION>
<S>                                                                    <C>
                  Less than one year from the date                -    _______ shares
                  hereof

                  One year but less than two years from           -    an additional ______ shares
                  the date hereof

                  Two years but less than three years             -    an additional ________ shares
                  from the date hereof

                  Three years but less than four years            -    an additional ________ shares
                  from the date hereof

                  Four years or more from the date                -    an additional ________ shares
                  hereof
</TABLE>

         Notwithstanding  the foregoing,  in accordance  with and subject to the
provisions of the Plan,  the Committee  may, in its  discretion,  accelerate the
date that any  installment  of this Option  becomes  exercisable.  The foregoing
rights are  cumulative  and  (subject to Sections 4 or 5 hereof if the  Employee
ceases to be  employed  by the  Company  and all  Related  Corporations)  may be
exercised  on or before the date which is ten years from the date this option is
granted. 


<PAGE>

         4. Termination of Employment.

                  (a)  Termination  Other Than for Cause. If the Employee ceases
to be employed by the Company and all Related Corporations, other than by reason
of death or  disability  as  defined in  Section 5 or  termination  for Cause as
defined in Section  4(c),  no further  installments  of this option shall become
exercisable,  and this option shall  terminate  (and may no longer be exercised)
after the passage of three months from the  Employee's  last day of  employment,
but in no event later than the scheduled  expiration  date. In such a case,  the
Employee's  only rights  hereunder  shall be those which are properly  exercised
before the  termination  of this  option. 

                  (b)  Termination  for Cause. If the employment of the Employee
is  terminated  for Cause (as  defined  in  Section  4(c)),  this  option  shall
terminate upon the Employee's  receipt of written notice of such termination and
shall thereafter not be exercisable to any extent whatsoever. 

                  (c) Definition of Cause.  "Cause" shall mean conduct involving
one or more of the following:  (i) the substantial and continuing failure of the
Employee,  after notice  thereof,  to render  services to the Company or Related
Corporation  in  accordance  with  the  terms  or  requirements  of  his  or her
employment; (ii) disloyalty, gross negligence, willful misconduct, dishonesty or
breach of  fiduciary  duty to the  Company  or  Related  Corporation;  (iii) the
commission of an act of embezzlement or fraud; (iv) deliberate  disregard of the
rules or policies of the Company or Related  Corporation which results in direct
or indirect loss,  damage or injury to the Company or Related  Corporation;  (v)
the unauthorized  disclosure of any trade secret or confidential  information of
the  Company  or Related  Corporation;  or (vi) the  commission  of an act which
constitutes unfair competition with the Company or Related  Corporation or which
induces  any  customer  or  supplier  to breach a contract  with the  Company or
Related Corporation.

         5. Death;  Disability.  

                  (a)  Death.  If the  Employee  dies while in the employ of the
Company or any Related Corporation,  this option may be exercised, to the extent
otherwise exercisable on the date of his or her death, by the Employee's estate,
personal  representative  or  beneficiary  to whom this option has been assigned
pursuant to Section 10, at any time within 180 after the date of death,  but not
later than the scheduled expiration date.

                  (b)  Disability.  If the Employee ceases to be employed by the
Company  and all Related  Corporations  by reason of his or her  disability  (as
defined in the Plan),  this  option may be  exercised,  to the extent  otherwise
exercisable on the date of the termination of his or her employment, at any time
within 180 after such termination,  but not later than the scheduled  expiration
date.  

                  (c) Effect of  Termination.  At the  expiration of the 180-day
period  provided in  paragraphs  (a) or (b) of this  Section 5 or the  scheduled
expiration  date,  whichever is the earlier,  this option shall  terminate  (and
shall no longer be exercisable)  and the only rights hereunder shall be those as
to which the option was properly  exercised before such termination.

                                      -2-

<PAGE>

         6. Partial  Exercise.  This option may be exercised in part at any time
and from time to time within the above  limits,  except that this option may not
be exercised  for a fraction of a share unless such  exercise is with respect to
the final  installment  of stock  subject  to this  option and cash in lieu of a
fractional  share must be paid, in accordance  with Paragraph 13(G) of the Plan,
to permit the  Employee  to  exercise  completely  such final  installment.  Any
fractional  share with respect to which an  installment of this option cannot be
exercised  because of the limitation  contained in the preceding  sentence shall
remain  subject to this option and shall be available for later  purchase by the
Employee in  accordance  with the terms  hereof.

         7.  Payment  of  Price.  (a)  The  option  price  shall  be paid in the
following  manner: 

                  (i) in cash or by check;  

                  (ii) subject to Section  7(b) below,  by delivery of shares of
the  Company's  Common Stock having a fair market  value (as  determined  by the
Committee)  equal as of the  date of  exercise  to the  option  price; 

                  (iii) by delivery of an  assignment  satisfactory  in form and
substance to the Company of a sufficient amount of the proceeds from the sale of
the Option Shares and an  instruction to the broker or selling agent to pay that
amount  to the  Company;  or 

                  (iv) by any  combination of the foregoing.  

         (b) Limitations on Payment by Delivery of Common Stock. If the Employee
delivers  Common Stock held by the Employee ("Old Stock") to the Company in full
or partial  payment  of the  option  price,  and the Old Stock so  delivered  is
subject to restrictions or limitations imposed by agreement between the Employee
and the Company,  an equivalent  number of Option Shares shall be subject to all
restrictions and limitations  applicable to the Old Stock to the extent that the
Employee paid for the Option Shares by delivery of Old Stock, in addition to any
restrictions  or  limitations  imposed by this  Agreement.  Notwithstanding  the
foregoing,  the Employee  may not pay any part of the  exercise  price hereof by
transferring Common Stock to the Company unless such Common Stock has been owned
by the Employee  free of any  substantial  risk of  forfeiture  for at least six
months.  

         (c) Permitted Payment by Recourse Note. In addition,  if this paragraph
is  initialed  below by the  person  signing  this  Agreement  on  behalf of the
Company,  the option price may be paid by delivery of the Employee's  three year
personal  recourse  promissory  note  bearing  interest  payable  not less  than
annually at the  applicable  Federal rate, as defined in Section  1274(d) of the
Code.

                                  ------------
                                   (initials)

         8. Restrictions on Resale; Legend. Option Shares may not be transferred
without the Company's written consent except by will, by the laws of descent and
distribution  and in  accordance  with the  provisions of Sections 17 and 18, if
applicable. Option Shares will be of an illiquid nature and will be deemed to be
"restricted  securities"  for purposes of the Securities Act of 1933, as

                                      -3-

<PAGE>

amended  (the  "Securities  Act").  Accordingly,  such  shares  must  be sold in
compliance  with  the  registration  requirements  of the  Securities  Act or an
exemption therefrom.  Each certificate evidencing any of the Option Shares shall
bear a legend substantially as follows:

         "The shares  represented  by this  certificate  are subject to
         restrictions  on  transfer  and  may not be  sold,  exchanged,
         transferred,  pledged,  hypothecated or otherwise  disposed of
         except in  accordance  with and  subject  to all the terms and
         conditions of a certain Incentive Stock Option Agreement dated
         as of  October  15,  1996,  a copy of which the  Company  will
         furnish to the holder of this  certificate  upon  request  and
         without  charge." 

         9. Method of Exercising Option.  Subject to the terms and conditions of
this Agreement, this option may be exercised by written notice to the Company at
its principal  executive  office, or to such transfer agent as the Company shall
designate.  Such notice shall state the election to exercise this option and the
number of Option  Shares for which it is being  exercised and shall be signed by
the  person  or  persons  so  exercising  this  option.  Such  notice  shall  be
accompanied  by  payment  of the full  purchase  price of such  shares,  and the
Company shall deliver a certificate or certificates  representing such shares as
soon as  practicable  after the notice shall be received.  Such  certificate  or
certificates  shall  be  registered  in the name of the  person  or  persons  so
exercising  this option (or, if this option  shall be  exercised by the Employee
and if the Employee shall so request in the notice exercising this option, shall
be registered in the name of the Employee and another person jointly, with right
of  survivorship).  In the event this  option  shall be  exercised,  pursuant to
Section 5 hereof, by any person or persons other than the Employee,  such notice
shall be accompanied by appropriate proof of the right of such person or persons
to  exercise  this  option. 

         10.  Option  Not  Transferable.  This  option  is not  transferable  or
assignable except by will or by the laws of descent and distribution. During the
Employee's  lifetime  only  the  Employee  can  exercise  this  option.

         11. No Obligation to Exercise Option.  The grant and acceptance of this
option  imposes no  obligation on the Employee to exercise it.

         12. No  Obligation  to  Continue  Employment.  Neither  the Plan,  this
Agreement, nor the grant of this option imposes any obligation on the Company or
any Related Corporation to continue the Employee in employment. 

         13. No Rights as Stockholder until Exercise. The Employee shall have no
rights as a stockholder with respect to the Option Shares until such time as the
Employee has  exercised  this option by  delivering a notice of exercise and has
paid in full the purchase  price for the shares so exercised in accordance  with
Section 9. Except as is  expressly  provided in the Plan with respect to certain
changes in the  capitalization  of the Company,  no adjustment shall be made for
dividends  or similar  rights for which the record date is prior to such date of
exercise.  

         14.  Capital  Changes  and  Business  Successions.  The  Plan  contains
provisions  covering the treatment of options in a number of contingencies  such
as stock splits and mergers.  Provisions in the Plan for adjustment with respect
to  stock  subject  to  options  and the  related  provisions  with  

                                      -4-

<PAGE>

respect to successors to the business of the Company are hereby made  applicable
hereunder and are incorporated herein by reference.  

         15. Early  Disposition.  The  Employee  agrees to notify the Company in
writing  immediately  after the Employee  transfers any Option  Shares,  if such
transfer  occurs on or before the later of (a) the date two years after the date
of this Agreement or (b) the date one year after the date the Employee  acquired
such Option  Shares.  The  Employee  also agrees to provide the Company with any
information  concerning  any  such  transfer  required  by the  Company  for tax
purposes.

         16. Withholding Taxes. If the Company or any Related Corporation in its
discretion  determines  that it is obligated  to withhold any tax in  connection
with the exercise of this option,  or in connection with the transfer of, or the
lapse of restrictions on, any Common Stock or other property  acquired  pursuant
to this  option,  the  Employee  hereby  agrees  that the Company or any Related
Corporation  may withhold from the Employee's  wages or other  remuneration  the
appropriate  amount  of  tax.  At the  discretion  of  the  Company  or  Related
Corporation,  the amount  required to be  withheld  may be withheld in cash from
such  wages or other  remuneration  or in kind  from the  Common  Stock or other
property  otherwise  deliverable to the Employee on exercise of this option. The
Employee further agrees that, if the Company or any Related Corporation does not
withhold an amount from the Employee's wages or other remuneration sufficient to
satisfy the withholding  obligation of the Company or Related  Corporation,  the
Employee  will  make   reimbursement   on  demand,   in  cash,  for  the  amount
underwithheld.  

         17.  Company's  Right of First Refusal.

                  (a) Exercise of Right. If the Employee desires to transfer all
or any part of the  Option  Shares to any  person  other  than the  Company  (an
"Offeror"),  the  Employee  shall:  (i)  obtain in writing  an  irrevocable  and
unconditional  bona fide offer (the  "Offer") for the purchase  thereof from the
Offeror;  and (ii) give  written  notice  (the  "Option  Notice") to the Company
setting forth the Employee's desire to transfer such shares, which Option Notice
shall be  accompanied  by a photocopy  of the Offer and shall set forth at least
the name and address of the  Offeror and the price and terms of the Offer.  Upon
receipt of the Option  Notice,  the Company shall have an  assignable  option to
purchase  any or  all of  such  Option  Shares  (the  "Company  Option  Shares")
specified in the Option Notice, such option to be exercisable by giving,  within
30 days after  receipt of the Option  Notice,  a written  counter-notice  to the
Employee.  If the Company  elects to purchase any or all of such Company  Option
Shares,  it shall be obligated to purchase,  and the Employee shall be obligated
to sell to the  Company,  such  Company  Option  Shares  at the  price and terms
indicated  in the Offer  within 30 days from the date of delivery by the Company
of such counter-notice.  

                  (b) Sale of Option Shares to Offeror. The Employee may, for 60
days after the  expiration  of the 30-day  option period as set forth in Section
17(a),  sell to the Offeror,  pursuant to the terms of the Offer,  any or all of
such  Company  Option  Shares not  purchased  or agreed to be  purchased  by the
Company or its assignee;  provided,  however,  that the Employee  shall not sell
such Company  Option  Shares to such Offeror if such Offeror is a competitor  of
the Company and the Company gives written notice to the Employee, within 30 days
of its receipt of the Option  Notice,  stating that the Employee  shall not sell
his or her Company Option Shares to such Offeror;  and provided,  further,  that
prior to the sale of such  Option  Shares  to an  Offeror,  such  Offeror  shall

                                      -5-

<PAGE>

execute an agreement  with the Company  pursuant to which such Offeror agrees to
be subject to the  restrictions  set forth in this  Section 17. If any or all of
such  Company  Option  Shares are not sold  pursuant to an Offer within the time
permitted  above,  the unsold  Company Option Shares shall remain subject to the
terms of this Section 17. 

                  (c)  Adjustments  for Changes in Capital  Structure.  If there
shall  be any  change  in  the  Common  Stock  of the  Company  through  merger,
consolidation,  reorganization,  recapitalization,  stock dividend, stock split,
combination or exchange of shares,  or the like, the  restrictions  contained in
Section 8 and this Section 17 shall apply with equal force to additional  and/or
substitute  securities,  if any, received by the Employee in exchange for, or by
virtue of his or her ownership of, Option Shares, except as otherwise determined
by the Board of Directors of the Company.

                  (d) Failure to Deliver Option Shares. If the Employee fails or
refuses to deliver on a timely  basis duly  endorsed  certificates  representing
Company Option Shares to be sold to the Company or its assignee pursuant to this
Section 17, the Company  shall have the right to deposit the purchase  price for
such Company  Option Shares in a special  account with any bank or trust company
in the  Commonwealth  of  Massachusetts,  giving  notice of such  deposit to the
Employee,  whereupon  such  Company  Option  Shares shall be deemed to have been
purchased  by the  Company.  All such monies  shall be held by the bank or trust
company for the benefit of the Employee.  All monies  deposited with the bank or
trust  company but  remaining  unclaimed for two years after the date of deposit
shall be repaid by the bank or trust  company to the Company on demand,  and the
Employee shall  thereafter look only to the Company for payment. 

                  (e)  Expiration  of  Company's  Right  of  First  Refusal  and
Transfer Restrictions.  The first refusal rights of the Company and the transfer
restrictions set forth above shall remain in effect until such time, if ever, as
a  distribution  to the public is made of shares of the  Company's  Common Stock
pursuant to a registration  statement  filed under the Securities  Act, at which
time the refusal rights of the Company and the transfer  restrictions  set forth
herein will automatically  expire. 

         18. Company's Right of Repurchase.

                  (a) Right of Repurchase. The Company shall have the right (the
"Repurchase  Right")  to  repurchase  all,  but no less than all,  of the Option
Shares from the holder of this option,  upon the occurrence of any of the events
specified in Section 18(b) below (the "Repurchase  Event"). The Repurchase Right
may be exercised by the Company  within 60 days  following the later of the date
of the exercise of this option or the date the Company receives actual knowledge
of such event (the "Repurchase Period"). The Repurchase Right shall be exercised
by the Company by giving the holder  written notice on or before the last day of
the Repurchase  Period of its intention to exercise the Repurchase  Right,  and,
together with such notice, tendering to the holder an amount equal to (i) in the
case of an event specified in Section 18(b)(i), (ii) or (iii) below, the greater
of the option price or the fair market value of the shares, and (ii) in the case
of an event specified in Section  18(b)(iv) or (v) below,  the option price. The
Company  may assign the  Repurchase  Right to one or more  persons.  Upon timely
exercise of the Repurchase  Right in the manner  provided in this Section 18(a),
the holder shall deliver to the Company the stock  certificate  or  certificates
representing the shares being  repurchased,  duly endorsed and free and clear of
any and all liens, charges and encumbrances.

                                      -6-
<PAGE>

         If shares are not purchased  under the Repurchase  Right,  the Employee
and his or her  successor in interest,  if any, will hold any such shares in his
or her  possession  subject  to all of the  provisions  of this  Agreement.  

                  (b) Company's Right to Exercise  Repurchase Right. The Company
shall have the  Repurchase  Right in the event that any of the following  events
shall occur:

                           (i) The termination of the Employee's employment with
the Company and all Related Corporations,  voluntarily or involuntarily, for any
reason  whatsoever  other than for Cause (as  defined in Section  4(c)  hereof),
including death or permanent disability,  prior to the time this option shall be
fully vested as provided in Section 3 hereof;

                           (ii) The receivership, bankruptcy or other creditor's
proceeding  regarding  the  Employee or the taking of any of  Employee's  shares
acquired  upon  exercise  of this  option  by legal  process,  such as a levy of
execution;  

                           (iii)  Distribution of shares held by the Employee to
his or her spouse as such  spouse's  joint or community  interest  pursuant to a
decree of dissolution,  operation of law, divorce, property settlement agreement
or for any other  reason,  except as may be otherwise  permitted by the Company;

                           (iv) The termination of the Employee's employment for
Cause (as  defined  in  Section  4(c)  hereof);  or 

                           (v)  Within  one  year  of  the  termination  of  the
Employee's  employment  with the Company and all  Related  Corporations  for any
reason whatsoever, the engagement by the Employee, directly or indirectly, alone
or with others,  in (a) any business  activity which is in competition  with the
Company or any Related Corporation or (b) the solicitation of, interference with
or  endeavor  to  entice  away  any  employee  of the  Company  or  any  Related
Corporation.

                  (c)  Determination of Fair Market Value. The fair market value
of the Option  Shares shall be, for purposes of this Section 18,  determined  in
accordance with paragraph 6D of the Plan as of the date of the Repurchase Event.
The  determination  by the Board of  Directors of the fair market value shall be
conclusive  and binding.  

                  (d) Expiration of Company's  Repurchase  Right. The Repurchase
Right shall remain in effect until such time,  if ever, as (i) the Option Shares
are  transferred in accordance  with Section 17 hereof or (ii) a distribution to
the  public is made of shares  of the  Company's  Common  Stock  pursuant  to an
effective  registration  statement  filed under the Securities  Act.

         19. Lock-up  Agreement.  The Employee agrees that in connection with an
underwritten public offering of Common Stock, upon the request of the Company or
the principal  underwriter  managing such public  offering,  this Option and the
Option Shares may not be sold, offered for sale or otherwise disposed of without
the prior written  consent of the Company or such  underwriter,  as the case may
be, for at least 270 days after the effectiveness of the registration  statement
filed in  connection  with such  offering,  or such longer period of time as the
Board of Directors may determine if all of the Company's  directors and officers
agree to be similarly bound. The lock-up 

                                      -7-
<PAGE>

agreement  established  pursuant to this Section 19 shall remain effective until
the  Option  and/or the Option  Shares  are sold to the  public  pursuant  to an
effective   registration   statement  or  an  exemption  from  the  registration
requirements of the Securities Act.

         20. Arbitration. Any dispute,  controversy, or claim arising out of, in
connection  with,  or  relating  to the  performance  of this  Agreement  or its
termination   shall  be  settled  by   arbitration   in  the   Commonwealth   of
Massachusetts,  pursuant to the rules then obtaining of the American Arbitration
Association.  Any award shall be final,  binding and conclusive upon the parties
and a judgment rendered thereon may be entered in any court having  jurisdiction
thereof. 

         21. Provision of  Documentation to Employee.  By signing this Agreement
the Employee  acknowledges receipt of a copy of this Agreement and a copy of the
Plan.

         22.  Miscellaneous.  

                  (a)  Notices.  All notices  hereunder  shall be in writing and
shall be deemed  given  when  sent by  certified  or  registered  mail,  postage
prepaid, return receipt requested, to the address set forth below. The addresses
for such notices may be changed from time to time by written notice given in the
manner provided for herein.

                  (b) Entire Agreement; Modification. This Agreement constitutes
the entire agreement  between the parties relative to the subject matter hereof,
and  supersedes all  proposals,  written or oral,  and all other  communications
between the  parties  relating to the  subject  matter of this  Agreement.  This
Agreement  may be  modified,  amended or rescinded  only by a written  agreement
executed by both  parties.  

                  (c)    Severability.    The    invalidity,    illegality    or
unenforceability  of any provision of this Agreement  shall in no way affect the
validity,  legality or enforceability of any other provision.

                  (d)  Successors and Assigns.  This Agreement  shall be binding
upon and  inure to the  benefit  of the  parties  hereto  and  their  respective
successors  and  assigns,  subject  to the  limitations  set forth in Section 10
hereof. 

                  (e)  Governing  Law. This  Agreement  shall be governed by and
interpreted in accordance with the laws of the  Commonwealth  of  Massachusetts,
without giving effect to the principles of the conflicts of laws thereof.


                                      -8-
<PAGE>


<TABLE>


         IN WITNESS  WHEREOF,  the  Company  and the  Employee  have caused this
instrument to be executed as of the date first above written.

<CAPTION>
<S>                                                           <C>

                                                              NBX Corporation
                                                              100 Brickstone Square
- -----------------------------------                           Andover, MA 01810
Employee

- -----------------------------------                           By: -----------------------------------
Print Name of Employee                                        Alexander Laats
                                                              Chairman and COO

- -----------------------------------
Street Address

- -----------------------------------
City     State    Zip Code

</TABLE>


                                      -9-




                                   Exhibit 4.2

                                 NBX CORPORATION

                                 1998 STOCK PLAN

         1.  Purpose.  The purpose of the NBX  Corporation  1998 Stock Plan (the
"Plan") is to encourage key employees of NBX Corporation  (the "Company") and of
any  present  or  future  parent or  subsidiary  of the  Company  (collectively,
"Related Corporations") and other individuals who render services to the Company
or a Related  Corporation,  by providing  opportunities  to  participate  in the
ownership of the Company and its future growth  through (a) the grant of options
which qualify as "incentive stock options"  ("ISOs") under Section 422(b) of the
Internal Revenue Code of 1986, as amended (the "Code"); (b) the grant of options
which do not qualify as ISOs ("Non-Qualified  Options");  (c) awards of stock in
the Company ("Awards");  and (d) opportunities to make direct purchases of stock
in the Company  ("Purchases").  Both ISOs and Non-Qualified Options are referred
to hereafter individually as an "Option" and collectively as "Options." Options,
Awards  and   authorizations   to  make  Purchases  are  referred  to  hereafter
collectively  as  "Stock  Rights."  As  used  herein,  the  terms  "parent"  and
"subsidiary"   mean   "parent   corporation"   and   "subsidiary   corporation,"
respectively, as those terms are defined in Section 424 of the Code.

         2. Administration of the Plan.

                  A.  Board  or  Committee  Administration.  The  Plan  shall be
         administered by the Board of Directors of the Company (the "Board") or,
         subject to Paragraph 2D (relating to compliance  with Section 162(m) of
         the Code),  by a committee  appointed  by the Board (the  "Committee").
         Hereinafter,  all references in this Plan to the "Committee" shall mean
         the Board if no Committee has been  appointed.  Subject to ratification
         of the grant or  authorization  of each Stock Right by the Board (if so
         required  by  applicable  state  law),  and subject to the terms of the
         Plan,  the Committee  shall have the authority to (i) determine to whom
         (from  among the  class of  employees  eligible  under  paragraph  3 to
         receive ISOs) ISOs shall be granted,  and to whom (from among the class
         of  individuals  and  entities  eligible  under  paragraph 3 to receive
         Non-Qualified  Options and Awards and to make Purchases)  Non-Qualified
         Options,  Awards and  authorizations  to make Purchases may be granted;
         (ii)  determine  the time or times at which  Options or Awards shall be
         granted or Purchases made; (iii) determine the purchase price of shares
         subject to each Option or Purchase, which prices shall not be less than
         the minimum price specified in paragraph 6; (iv) determine whether each
         Option granted shall be an ISO or a Non-Qualified Option; (v) determine
         (subject  to  paragraph  7) the time or times  when each  Option  shall
         become exercisable and the duration of the exercise period; (vi) extend
         the period during which  outstanding  Options may be  exercised;  (vii)
         determine  whether  restrictions  such as repurchase  options are to be
         imposed on shares  subject to  Options,  Awards and  Purchases  and the
         nature of such restrictions,  if any, and (viii) interpret the Plan and
         prescribe  and  rescind  rules and  regulations  relating to it. If the
         Committee  determines to issue a  Non-Qualified  Option,  it shall take
         whatever actions it deems necessary,  under Section 422 of the Code and
         the regulations promulgated  thereunder,  to ensure that such Option is
         not  treated as an ISO.  The  interpretation  and  construction  by the
         Committee of any  provisions  of the Plan or of any Stock Right granted
         under it shall be final unless  otherwise  determined by the Board. The
         Committee  may from time to time adopt such rules and  regulations  for
         carrying out the Plan as it may deem advisable.  No member of the Board
         or the Committee shall be liable for any action or  determination  made
         in good faith with respect to the Plan or any Stock Right granted under
         it.



<PAGE>


                  B.  Committee  Actions.  The  Committee  may select one of its
         members  as its  chairman,  and shall  hold  meetings  at such time and
         places  as  it  may  determine.  A  majority  of  the  Committee  shall
         constitute  a  quorum  and acts of a  majority  of the  members  of the
         Committee at a meeting at which a quorum is present, or acts reduced to
         or  approved  in  writing  by all  the  members  of the  Committee  (if
         consistent with applicable  state law),  shall be the valid acts of the
         Committee.  From time to time the Board  may  increase  the size of the
         Committee and appoint additional members thereof,  remove members (with
         or without  cause) and appoint new  members in  substitution  therefor,
         fill vacancies  however caused,  or remove all members of the Committee
         and thereafter directly administer the Plan.

                  C. Grant of Stock Rights to Board Members. Stock Rights may be
         granted to members of the Board.  All grants of Stock Rights to members
         of the  Board  shall in all  respects  be made in  accordance  with the
         provisions of this Plan applicable to other eligible  persons.  Members
         of the Board who either  (i) are  eligible  to receive  grants of Stock
         Rights  pursuant to the Plan or (ii) have been granted Stock Rights may
         vote on any matters  affecting  the  administration  of the Plan or the
         grant of any Stock  Rights  pursuant  to the Plan,  except that no such
         member  shall act upon the  granting  to  himself  or  herself of Stock
         Rights, but any such member may be counted in determining the existence
         of a quorum at any meeting of the Board  during  which  action is taken
         with respect to the granting to such member of Stock Rights.

                  D.   Performance-Based   Compensation.   The  Board,   in  its
         discretion,  may take such  action as may be  necessary  to ensure that
         Stock   Rights   granted   under  the  Plan   qualify   as   "qualified
         performance-based compensation" within the meaning of Section 162(m) of
         the   Code   and   applicable   regulations    promulgated   thereunder
         ("Performance-Based  Compensation").  Such action may  include,  in the
         Board's  discretion,  some  or all of the  following  (i) if the  Board
         determines  that Stock Rights  granted under the Plan  generally  shall
         constitute   Performance-Based   Compensation,   the   Plan   shall  be
         administered,   to  the  extent  required  for  such  Stock  Rights  to
         constitute  Performance-Based  Compensation,  by a Committee consisting
         solely of two or more  "outside  directors"  (as defined in  applicable
         regulations  promulgated under Section 162(m) of the Code), (ii) if any
         Non-Qualified  Options with an exercise price less than the fair market
         value  per share of Common  Stock  are  granted  under the Plan and the
         Board determines that such Options should constitute  Performance-Based
         Compensation,  such  options  shall be made  exercisable  only upon the
         attainment of a pre-established, objective performance goal established
         by the  Committee,  and such grant shall be submitted for, and shall be
         contingent  upon  shareholder  approval and (iii) Stock Rights  granted
         under the Plan may be subject to such other terms and conditions as are
         necessary for  compensation  recognized in connection with the exercise
         or disposition  of such Stock Right or the  disposition of Common Stock
         acquired pursuant to such Stock Right, to constitute  Performance-Based
         Compensation.

         3. Eligible Employees and Others. ISOs may be granted only to employees
of the Company or any Related  Corporation.  Non-Qualified  Options,  Awards and
authorizations  to make  Purchases  may be granted to any  employee,  officer or
director  (whether or not also an employee) or  consultant of the Company or any
Related  Corporation.  The Committee may take into  consideration  a recipient's
individual  circumstances  in  determining  whether to grant a Stock Right.  The
granting of any Stock Right to any  individual or entity shall  neither  entitle
that  individual or entity to, nor  disqualify  such  individual or entity from,
participation in any other grant of Stock Rights.

                                      -2-

<PAGE>


         4. Stock.  The stock  subject to Stock Rights shall be  authorized  but
unissued  shares of Common Stock of the Company,  par value $.001 per share (the
"Common  Stock"),  or shares of Common  Stock  reacquired  by the Company in any
manner.  The aggregate number of shares which may be issued pursuant to the Plan
is 400,000,  subject to  adjustment  as provided in paragraph  13. If any Option
granted under the Plan shall expire or terminate for any reason  without  having
been  exercised in full or shall cease for any reason to be exercisable in whole
or in part or shall be repurchased  by the Company,  the  unpurchased  shares of
Common Stock subject to such Option shall again be available for grants of Stock
Rights under the Plan.

         5. Granting of Stock Rights. Stock Rights may be granted under the Plan
at any time on or after  May 19,  1998 and  prior to May 19,  2009.  The date of
grant  of a Stock  Right  under  the  Plan  will be the  date  specified  by the
Committee at the time it grants the Stock Right;  provided,  however,  that such
date shall not be prior to the date on which the  Committee  acts to approve the
grant.

         6. Minimum Option Price; ISO Limitations.

                  A. Price for  Non-Qualified  Options,  Awards  and  Purchases.
         Subject to Paragraph 2D (relating to compliance  with Section 162(m) of
         the Code),  the exercise  price per share  specified  in the  agreement
         relating to each Non-Qualified  Option granted,  and the purchase price
         per share of stock  granted in any Award or  authorized  as a Purchase,
         under the Plan may be less  than the fair  market  value of the  Common
         Stock of the Company on the date of grant;  provided  that, in no event
         shall  such  exercise  price or such  purchase  price be less  than the
         minimum legal  consideration  required  therefor  under the laws of any
         jurisdiction  in which the Company or its successors in interest may be
         organized.

                  B. Price for ISOs. The exercise  price per share  specified in
         the agreement  relating to each ISO granted under the Plan shall not be
         less than the fair market  value per share of Common  Stock on the date
         of such  grant.  In the  case of an ISO to be  granted  to an  employee
         owning  stock  possessing  more  than ten  percent  (10%) of the  total
         combined  voting  power of all  classes of stock of the  Company or any
         Related  Corporation,  the price per share  specified in the  agreement
         relating  to such ISO shall not be less than one  hundred  ten  percent
         (110%) of the fair market  value per share of Common  Stock on the date
         of grant.  For  purposes  of  determining  stock  ownership  under this
         paragraph,  the rules of Section  424(d) of the Code shall  apply.  The
         date of grant for  purposes  of this  subparagraph  shall mean the date
         that the Company or Related Corporation  completes the corporate action
         constituting an offer of stock for sale to an individual.

                  C. $100,000  Annual  Limitation on ISO Vesting.  Each eligible
         employee  may be  granted  Options  treated  as ISOs only to the extent
         that, in the aggregate  under this Plan and all incentive  stock option
         plans of the Company and any  Related  Corporation,  ISOs do not become
         exercisable  for the first time by such  employee  during any  calendar
         year with respect to stock having a fair market  value  (determined  at
         the time the ISOs were  granted)  in excess of  $100,000.  The  Company
         intends to designate any Options  granted in excess of such  limitation
         as  Non-Qualified   Options,  and  the  Company  shall  issue  separate
         certificates   to  the  optionee  with  respect  to  Options  that  are
         Non-Qualified Options and Options that are ISOs.

                  D.  Determination  of Fair  Market  Value.  If, at the time an
         Option is  granted  under  the  Plan,  the  Company's  Common  Stock is
         publicly traded, "fair market value" shall be determined as of the date
         of grant or, if the prices or quotes  discussed  in this  sentence  are
         unavailable  for such date,

                                      -3-

<PAGE>


         the last  business  day for which such  prices or quotes are  available
         prior to the date of grant  and  shall  mean (i) the  average  (on that
         date) of the high and low prices of the Common  Stock on the  principal
         national  securities  exchange on which the Common Stock is traded,  if
         the Common Stock is then traded on a national securities  exchange;  or
         (ii) the last reported sale price (on that date) of the Common Stock on
         the Nasdaq National Market, if the Common Stock is not then traded on a
         national  securities  exchange;  or (iii)  the  closing  bid  price (or
         average of bid  prices)  last  quoted (on that date) by an  established
         quotation service for over-the-counter  securities, if the Common Stock
         is not reported on the Nasdaq National  Market.  If the Common Stock is
         not  publicly  traded at the time an Option is granted  under the Plan,
         "fair  market  value"  shall mean the fair value of the Common Stock as
         determined by the Committee after taking into consideration all factors
         which it deems appropriate,  including, without limitation, recent sale
         and offer prices of the Common Stock in private transactions negotiated
         at arm's length.

         7.  Option  Duration.  Subject to earlier  termination  as  provided in
paragraphs 9 and 10 or in the  agreement  relating to such  Option,  each Option
shall expire on the date specified by the  Committee,  but not more than (i) ten
years  from the date of grant in the case of  Options  generally  and (ii)  five
years from the date of grant in the case of ISOs  granted to an employee  owning
stock  possessing more than ten percent (10%) of the total combined voting power
of all classes of stock of the Company or any Related Corporation, as determined
under paragraph 6(B). Subject to earlier termination as provided in paragraphs 9
and 10,  the term of each  ISO  shall  be the  term  set  forth in the  original
instrument  granting such ISO,  except with respect to any part of such ISO that
is converted into a Non-Qualified Option pursuant to paragraph 16.

         8.  Exercise  of Option.  Subject to the  provisions  of  paragraphs  9
through  12 and  paragraph  21,  each  Option  granted  under the Plan  shall be
exercisable as follows:

                  A. Vesting.  The Option shall either be fully  exercisable  on
         the  date of  grant  or shall  become  exercisable  thereafter  in such
         installments as the Committee may specify.

                  B. Full Vesting of Installments.  Once an installment  becomes
         exercisable,   it  shall  remain   exercisable   until   expiration  or
         termination of the Option, unless otherwise specified by the Committee.

                  C.  Partial  Exercise.  Each  Option  or  installment  may  be
         exercised at any time or from time to time, in whole or in part, for up
         to the  total  number  of  shares  with  respect  to  which  it is then
         exercisable.

                  D. Acceleration of Vesting. The Committee shall have the right
         to  accelerate  the date that any  installment  of any  Option  becomes
         exercisable; provided that the Committee shall not, without the consent
         of  an  optionee,   accelerate  the  permitted  exercise  date  of  any
         installment  of any Option  granted to any  employee as an ISO (and not
         previously  converted into a Non-Qualified Option pursuant to paragraph
         16) if such  acceleration  would violate the annual vesting  limitation
         contained  in Section  422(d) of the Code,  as  described  in paragraph
         6(C).

         9. Termination of Employment.  Unless otherwise  specified in this Plan
or the agreement  relating to such ISO, if an ISO optionee ceases to be employed
by the  Company and all  Related  Corporations  other than by reason of death or
disability  as defined in paragraph  10, no further  installments  of his or her
ISOs  shall  become  exercisable,  and his or her ISOs  shall  terminate  on the
earlier  of (a)  three  months  after  the  date  of  termination  of his or her
employment,  or (b) their specified  expiration dates, except to the extent that

                                      -4-

<PAGE>


such  ISOs (or  unexercised  installments  thereof)  have  been  converted  into
Non-Qualified  Options  pursuant to paragraph 16. For purposes of this paragraph
9, employment  shall be considered as continuing  uninterrupted  during any bona
fide  leave  of  absence  (such  as  those  attributable  to  illness,  military
obligations or governmental service) provided that the period of such leave does
not exceed 90 days or, if longer,  any period during which such optionee's right
to  reemployment  is guaranteed by statute or by contract.  A bona fide leave of
absence with the written  approval of the  Committee  shall not be considered an
interruption  of employment  under this  paragraph 9, provided that such written
approval  contractually  obligates  the  Company or any Related  Corporation  to
continue the  employment of the optionee  after the approved  period of absence.
ISOs  granted  under the Plan shall not be affected by any change of  employment
within or among the Company and Related  Corporations,  so long as the  optionee
continues to be an employee of the Company or any Related  Corporation.  Nothing
in the Plan shall be deemed to give any  grantee of any Stock Right the right to
be  retained  in  employment  or other  service by the  Company  or any  Related
Corporation for any period of time.

         10. Death; Disability.

                  A.  Death.  If an ISO  optionee  ceases to be  employed by the
         Company and all Related Corporations by reason of his or her death, any
         ISO owned by such  optionee may be exercised,  to the extent  otherwise
         exercisable   on  the  date  of   death,   by  the   estate,   personal
         representative  or  beneficiary  who has acquired the ISO by will or by
         the laws of  descent  and  distribution,  until the  earlier of (i) the
         specified  expiration date of the ISO or (ii) 180 days from the date of
         the optionee's death.

                  B. Disability. If an ISO optionee ceases to be employed by the
         Company  and  all  Related   Corporations  by  reason  of  his  or  her
         disability, such optionee shall have the right to exercise any ISO held
         by him or her on the date of termination of employment,  for the number
         of shares  for which he or she could  have  exercised  it on that date,
         until the earlier of (i) the  specified  expiration  date of the ISO or
         (ii)  180  days  from the  date of the  termination  of the  optionee's
         employment.  For the purposes of the Plan, the term "disability"  shall
         mean "permanent and total disability" as defined in Section 22(e)(3) of
         the Code or any successor statute.

         11.  Assignability.  No ISO shall be assignable or  transferable by the
optionee except by will or by the laws of descent and  distribution,  and during
the lifetime of the optionee shall be exercisable  only by such optionee.  Stock
Rights  other  than ISOs  shall be  transferable  to the extent set forth in the
agreement relating to such Stock Right.

         12.  Terms and  Conditions  of Options.  Options  shall be evidenced by
instruments  (which need not be  identical)  in such forms as the  Committee may
from time to time  approve.  Such  instruments  shall  conform  to the terms and
conditions  set forth in  paragraphs  6 through 11 hereof and may  contain  such
other  provisions as the Committee deems  advisable  which are not  inconsistent
with the Plan,  including  restrictions  applicable  to  shares of Common  Stock
issuable  upon  exercise  of  Options.   The  Committee  may  specify  that  any
Non-Qualified  Option shall be subject to the restrictions set forth herein with
respect to ISOs, or to such other termination and cancellation provisions as the
Committee may  determine.  The Committee may from time to time confer  authority
and responsibility on one or more of its own members and/or one or more officers
of the Company to execute and deliver such  instruments.  The proper officers of
the Company are authorized and directed to take any and all action  necessary or
advisable from time to time to carry out the terms of such instruments.

                                      -5-

<PAGE>


         13. Adjustments. Upon the occurrence of any of the following events, an
optionee's  rights with respect to Options  granted to such  optionee  hereunder
shall  be  adjusted  as  hereinafter  provided,  unless  otherwise  specifically
provided in the written  agreement between the optionee and the Company relating
to such Option:

                  A. Stock  Dividends and Stock Splits.  If the shares of Common
         Stock shall be subdivided or combined into a greater or smaller  number
         of shares or if the Company shall issue any shares of Common Stock as a
         stock dividend on its outstanding Common Stock, the number of shares of
         Common  Stock  deliverable  upon  the  exercise  of  Options  shall  be
         appropriately increased or decreased  proportionately,  and appropriate
         adjustments  shall be made in the  purchase  price per share to reflect
         such subdivision, combination or stock dividend.

                  B.  Consolidations  or  Mergers.  If  the  Company  is  to  be
         consolidated  with or acquired by another entity by sale or transfer of
         capital stock or in a merger or other reorganization and as a result of
         such sale or  transfer,  merger or  reorganization  the  holders of the
         outstanding  voting  stock of the  Company  immediately  preceding  the
         consummation of such event,  shall,  immediately  following such event,
         hold,  as a  group,  less  than  a  majority  of  the  combined  voting
         securities of the surviving or successor entity, or by a sale of all or
         substantially  all of the  Company's  assets  or  otherwise  (each,  an
         "Acquisition"),  the  Committee or the board of directors of any entity
         assuming  the  obligations  of the Company  hereunder  (the  "Successor
         Board"),  shall, as to outstanding Options, either (i) make appropriate
         provision for the  continuation  of such Options by  substituting on an
         equitable  basis for the shares then subject to such Options either (a)
         the  consideration  payable with respect to the  outstanding  shares of
         Common Stock in connection with the Acquisition, (b) shares of stock of
         the surviving or successor  corporation or (c) such other securities as
         the Successor Board deems  appropriate,  the fair market value of which
         shall not  materially  exceed  the fair  market  value of the shares of
         Common  Stock  subject  to  such  Options  immediately   preceding  the
         Acquisition; or (ii) upon written notice to the optionees, provide that
         all Options must be exercised,  to the extent then exercisable or to be
         exercisable as a result of the Acquisition or pursuant to paragraph 21,
         within a specified  number of days of the date of such  notice,  at the
         end of which period the Options shall terminate; or (iii) terminate all
         Options in exchange for a cash payment  equal to the excess of the fair
         market value of the shares  subject to such Options (to the extent then
         exercisable  or to be  exercisable  as a result of the  Acquisition  or
         pursuant to paragraph 21) over the exercise price thereof.

                  C.  Recapitalization  or  Reorganization.  In the  event  of a
         recapitalization  or  reorganization  of  the  Company  (other  than  a
         transaction  described  in  subparagraph  B  above)  pursuant  to which
         securities  of the  Company or of another  corporation  are issued with
         respect to the  outstanding  shares of Common  Stock,  an optionee upon
         exercising  an Option  shall be entitled  to receive  for the  purchase
         price  paid upon such  exercise  the  securities  he or she would  have
         received  if  he or  she  had  exercised  such  Option  prior  to  such
         recapitalization or reorganization.

                  D. Modification of ISOs.  Notwithstanding  the foregoing,  any
         adjustments  made pursuant to  subparagraphs  A, B or C with respect to
         ISOs  shall be made only after the  Committee,  after  consulting  with
         counsel for the  Company,  determines  whether such  adjustments  would
         constitute  a  "modification"  of such ISOs (as that term is defined in
         Section 424 of the Code) or would  cause any  adverse tax  consequences
         for the holders of such ISOs.  If the  Committee  determines  that such
         adjustments  made with respect to ISOs would  constitute a modification
         of such ISOs or would cause adverse tax consequences to the holders, it
         may refrain from making such adjustments.

                                      -6-

<PAGE>


                  E.  Dissolution or  Liquidation.  In the event of the proposed
         dissolution or  liquidation of the Company,  each Option will terminate
         immediately  prior to the  consummation  of such proposed  action or at
         such  other  time and  subject  to such  other  conditions  as shall be
         determined by the Committee.

                  F.  Issuances  of  Securities.  Except as  expressly  provided
         herein,  no issuance by the Company of shares of stock of any class, or
         securities convertible into shares of stock of any class, shall affect,
         and no adjustment by reason  thereof shall be made with respect to, the
         number or price of shares subject to Options.  No adjustments  shall be
         made for dividends paid in cash or in property other than securities of
         the Company.

                  G.  Fractional  Shares.  No fractional  shares shall be issued
         under the Plan and the optionee  shall receive from the Company cash in
         lieu of such fractional shares.

                  H.  Adjustments.  Upon  the  happening  of any  of the  events
         described in  subparagraphs  A, B or C above,  the class and  aggregate
         number of shares set forth in  paragraph  4 hereof  that are subject to
         Stock Rights which  previously have been or subsequently may be granted
         under the Plan  shall also be  appropriately  adjusted  to reflect  the
         events described in such subparagraphs.  The Committee or the Successor
         Board shall  determine the specific  adjustments  to be made under this
         paragraph 13 and,  subject to paragraph 2, its  determination  shall be
         conclusive.

         14. Means of Exercising  Options. An Option (or any part or installment
thereof)  shall be  exercised  by giving  written  notice to the  Company at its
principal  office  address,  or to such  transfer  agent  as the  Company  shall
designate. Such notice shall identify the Option being exercised and specify the
number of shares as to which such Option is being exercised, accompanied by full
payment of the purchase  price  therefor  either (a) in United States dollars in
cash or by check,  (b) at the discretion of the Committee,  through  delivery of
shares of Common  Stock  having a fair market  value equal as of the date of the
exercise to the cash exercise price of the Option,  (c) at the discretion of the
Committee,  by delivery of the grantee's personal recourse note bearing interest
payable  not less than  annually  at no less than 100% of the lowest  applicable
Federal rate, as defined in Section  1274(d) of the Code,  (d) at the discretion
of the Committee and consistent with applicable law,  through the delivery of an
assignment  to the Company of a sufficient  amount of the proceeds from the sale
of the Common Stock acquired upon exercise of the Option and an authorization to
the broker or selling agent to pay that amount to the Company,  which sale shall
be at  the  participant's  direction  at the  time  of  exercise,  or (e) at the
discretion of the Committee,  by any combination of (a), (b), (c) and (d) above.
If the  Committee  exercises its  discretion  to permit  payment of the exercise
price of an ISO by means of the methods set forth in clauses  (b),  (c),  (d) or
(e) of the preceding sentence,  such discretion shall be exercised in writing at
the time of the grant of the ISO in question.  The holder of an Option shall not
have the rights of a  shareholder  with  respect  to the shares  covered by such
Option until the date of issuance of a stock certificate to such holder for such
shares.  Except as  expressly  provided  above in  paragraph  13 with respect to
changes in capitalization  and stock dividends,  no adjustment shall be made for
dividends  or similar  rights for which the record  date is before the date such
stock certificate is issued.

         15. Term and  Amendment of Plan.  This Plan was adopted by the Board on
May 19, 1998, subject,  with respect to the validation of ISOs granted under the
Plan,  to  approval of the Plan by the  stockholders  of the Company at the next
meeting of stockholders or, in lieu thereof, by written consent. If the approval
of  stockholders is not obtained prior to May 19, 1999, any grants of ISOs under
the Plan made prior to that date will be rescinded. The Plan shall expire at the
end of the day on May 18, 2008 (except as to Options  outstanding on that date).
Subject to the provisions of paragraph 5 above, Options may be granted

                                      -7-

<PAGE>


under the Plan prior to the date of stockholder  approval of the Plan. The Board
may terminate or amend the Plan in any respect at any time, except that, without
the approval of the  stockholders  obtained within 12 months before or after the
Board adopts a resolution  authorizing  any of the  following  actions:  (a) the
total  number of shares that may be issued  under the Plan may not be  increased
(except by adjustment pursuant to paragraph 13); (b) the provisions of paragraph
3  regarding  eligibility  for  grants  of  ISOs  may not be  modified;  (c) the
provisions of paragraph 6(B) regarding the exercise price at which shares may be
offered pursuant to ISOs may not be modified  (except by adjustment  pursuant to
paragraph  13);  and (d) the  expiration  date of the Plan may not be  extended.
Except as otherwise provided in this paragraph 15, in no event may action of the
Board or  stockholders  alter or impair the rights of a  grantee,  without  such
grantee's consent, under any Stock Right previously granted to such grantee.

         16.  Modifications  of  ISOs;  Conversion  of ISOs  into  Non-Qualified
Options.  Subject to Paragraph  13D,  without the prior  written  consent of the
holder of an ISO, the Committee shall not alter the terms of such ISO (including
the  means  of  exercising  such  ISO) if such  alteration  would  constitute  a
modification  (within  the  meaning  of  Section  424(h)(3)  of the  Code).  The
Committee,  at the written  request or with the written consent of any optionee,
may in its  discretion  take such  actions as may be  necessary  to convert such
optionee's ISOs (or any  installments or portions of installments  thereof) that
have not been exercised on the date of conversion into Non-Qualified  Options at
any time  prior to the  expiration  of such  ISOs,  regardless  of  whether  the
optionee is an employee of the Company or a Related  Corporation  at the time of
such  conversion.  Such  actions  may  include,  but  shall not be  limited  to,
extending the exercise  period or reducing the exercise price of the appropriate
installments of such ISOs. At the time of such  conversion,  the Committee (with
the consent of the optionee)  may impose such  conditions on the exercise of the
resulting   Non-Qualified  Options  as  the  Committee  in  its  discretion  may
determine,  provided that such conditions  shall not be  inconsistent  with this
Plan. Nothing in the Plan shall be deemed to give any optionee the right to have
such  optionee's  ISOs  converted  into  Non-Qualified   Options,  and  no  such
conversion shall occur until and unless the Committee takes appropriate  action.
Upon the taking of such action, the Company shall issue separate certificates to
the optionee with respect to Options that are Non-Qualified  Options and Options
that are ISOs.

         17. Application Of Funds. The proceeds received by the Company from the
sale of shares  pursuant to Options granted and Purchases  authorized  under the
Plan shall be used for general corporate purposes.

         18. Notice to Company of Disqualifying Disposition. By accepting an ISO
granted under the Plan,  each  optionee  agrees to notify the Company in writing
immediately after such optionee makes a Disqualifying  Disposition (as described
in Sections  421,  422 and 424 of the Code and  regulations  thereunder)  of any
stock  acquired  pursuant to the  exercise  of ISOs  granted  under the Plan.  A
Disqualifying  Disposition is generally any  disposition  occurring on or before
the later of (a) the date two years  following  the date the ISO was  granted or
(b) the date one year following the date the ISO was exercised.

         19.  Withholding  of Additional  Income  Taxes.  Upon the exercise of a
Non-Qualified  Option, the transfer of a Non-Qualified  Stock Option pursuant to
an arm's-length transaction,  the grant of an Award, the making of a Purchase of
Common Stock for less than its fair market value,  the making of a Disqualifying
Disposition  (as defined in paragraph 18), the vesting or transfer of restricted
stock or  securities  acquired on the  exercise of an Option  hereunder,  or the
making  of a  distribution  or  other  payment  with  respect  to such  stock or
securities, the Company may withhold taxes in respect of amounts that constitute
compensation  includible in gross income.  The Committee in its  discretion  may
condition  (i) the exercise of an Option,  (ii) the transfer of a  Non-Qualified
Stock  Option,  (iii) the grant of an Award,  (iv) the making of a  Purchase  of

                                      -8-

<PAGE>


Common  Stock  for less  than its  fair  market  value,  or (v) the  vesting  or
transferability  of  restricted  stock or  securities  acquired by exercising an
Option, on the grantee's making  satisfactory  arrangement for such withholding.
Such  arrangement  may include payment by the grantee in cash or by check of the
amount of the withholding  taxes or, at the discretion of the Committee,  by the
grantee's  delivery of previously held shares of Common Stock or the withholding
from the shares of Common Stock otherwise deliverable upon exercise of an Option
shares  having  an  aggregate  fair  market  value  equal to the  amount of such
withholding taxes.

         20.  Governmental  Regulation.  The  Company's  obligation  to sell and
deliver shares of the Common Stock under this Plan is subject to the approval of
any  governmental  authority  required  in  connection  with the  authorization,
issuance or sale of such shares.

         Government regulations may impose reporting or other obligations on the
Company  with respect to the Plan.  For example,  the Company may be required to
send tax information  statements to employees and former employees that exercise
ISOs under the Plan,  and the Company  may be  required to file tax  information
returns  reporting the income received by grantees of Options in connection with
the Plan.

         21.  Acceleration of Vesting of Option after an Acquisition.  As of the
effective  date of an  Acquisition,  as  defined in  paragraph  13 of this Plan,
one-half  of the Options  granted to the  optionee  that are  unvested as of the
effective date of the  Acquisition  shall become fully vested and exercisable by
the optionee  immediately  prior to the effective date of the  Acquisition.  The
remaining  unvested  Options shall  continue to vest over the remaining  vesting
period on a pro-rata  basis,  with the amount  scheduled to vest on each vesting
date  in the  remaining  vesting  period  reduced  by one  half.  The  foregoing
notwithstanding,  the Board of Directors,  in its sole  discretion,  may require
that the optionee's rights under this paragraph shall be conditioned on approval
by stockholders of the Company in accordance with Section  280G(b)(5)(B)  of the
Code and regulations thereunder.  Notwithstanding the foregoing, no Option shall
become vested and  exercisable  pursuant to this paragraph and no optionee shall
acquire any rights as a result of this paragraph, if the acceleration or vesting
of any such Option would  prevent the Company from  accounting  for a particular
business  combination  as a "pooling  of  interests"  pursuant  to the terms and
conditions of APB 16 and the rules and  regulations  promulgated  thereunder (or
any  successor  rule or  pronouncement)  at any time when the Board of Directors
deems it desirable  to account for such  business  combination  as a "pooling of
interests."

         22.  Governing Law. The validity and  construction  of the Plan and the
instruments evidencing Options shall be governed by the laws of The Commonwealth
of  Massachusetts,  or the laws of any  jurisdiction in which the Company or its
successors in interest may be organized.

                                      -9-
<PAGE>

                                 NBX Corporation

                        Incentive Stock Option Agreement


         NBX Corporation, a Delaware corporation (the "Company"),  hereby grants
as of ________,  to _________ (the "Employee"),  an option to purchase a maximum
of ___________ (_______) shares (the "Option Shares") of its Common Stock, $.001
par value ("Common  Stock"),  at the price of __________  ($_____) per share, on
the following terms and conditions: 

         1. Grant Under 1998 Stock Plan. This option is granted  pursuant to and
is  governed  by the  Company's  1998 Stock Plan (the  "Plan")  and,  unless the
context otherwise requires,  terms used herein shall have the same meaning as in
the Plan.  Determinations  made in connection  with this option  pursuant to the
Plan  shall be  governed  by the Plan as it exists  on this  date.

         2. Grant as  Incentive  Stock  Option;  Other  Options.  This option is
intended  to qualify as an  incentive  stock  option  under  Section  422 of the
Internal  Revenue  Code of 1986,  as amended  (the  "Code").  This  option is in
addition to any other options heretofore or hereafter granted to the Employee by
the Company or any Related Corporation (as defined in the Plan), but a duplicate
original of this  instrument  shall not effect the grant of another  option.

<TABLE>
         3.  Vesting of Option if  Employment  Continues.  If the  Employee  has
continued  to be  employed  by the  Company or any  Related  Corporation  on the
following  dates, the Employee may exercise this option for the number of shares
of Common Stock set opposite the applicable date:

<CAPTION>
<S>                                                           <C>

                  Less than one year from the date   -        ______ shares
                  hereof

                  One year from the date hereof      -        an additional _______ shares

                  Each month thereafter until the    -        an additional _______ shares
                  four year anniversary of the date
                  hereof (a total of 36 monthly
                  installments)

</TABLE>

         Notwithstanding  the foregoing,  in accordance  with and subject to the
provisions of the Plan,  the Committee  may, in its  discretion,  accelerate the
date that any  installment  of this Option  becomes  exercisable.  The foregoing
rights are  cumulative  and  (subject to Sections 4 or 5 hereof if the  Employee
ceases to be  employed  by the  Company  and all  Related  Corporations)  may be
exercised  on or before the date which is ten years from the date this option is
granted.

         4. Termination of Employment.

                  (a)  Termination  Other Than for Cause. If the Employee ceases
         to be employed by the Company and all Related Corporations,  other than
         by reason of death or disability as defined in Section 5 or termination
         for Cause as defined in Section 4(c), 


<PAGE>

         no further  installments of this option shall become  exercisable,  and
         this option shall terminate (and may no longer be exercised)  after the
         passage of three months from the Employee's last day of employment, but
         in no event later than the scheduled  expiration  date. In such a case,
         the Employee's only rights  hereunder shall be those which are properly
         exercised  before the  termination of this option.  

                  (b)  Termination  for Cause. If the employment of the Employee
         is terminated for Cause (as defined in Section 4(c)), this option shall
         terminate  upon  the  Employee's  receipt  of  written  notice  of such
         termination  and shall  thereafter  not be  exercisable  to any  extent
         whatsoever.

                  (c) Definition of Cause.  "Cause" shall mean conduct involving
         one or more of the following: (i) disloyalty, gross negligence, willful
         misconduct,  dishonesty  or breach of fiduciary  duty to the Company or
         Related  Corporation;  (ii) the commission of an act of embezzlement or
         fraud;  (iii)  deliberate  disregard  of the rules or  policies  of the
         Company  or Related  Corporation  which  results in direct or  indirect
         loss, damage or injury to the Company or Related Corporation;  (iv) the
         unauthorized disclosure of any trade secret or confidential information
         of the Company or Related Corporation;  or (v) the commission of an act
         which  constitutes  unfair  competition  with the  Company  or  Related
         Corporation  or which  induces  any  customer  or  supplier to breach a
         contract with the Company or Related Corporation.


         5. Death;  Disability. 

                  (a)  Death.  If the  Employee  dies while in the employ of the
         Company or any Related  Corporation,  this option may be exercised,  to
         the extent  otherwise  exercisable on the date of his or her death,  by
         the Employee's estate,  personal  representative or beneficiary to whom
         this  option has been  assigned  pursuant  to  Section  10, at any time
         within  180  days  after  the date of  death,  but not  later  than the
         scheduled expiration date.

                  (b)  Disability.  If the Employee ceases to be employed by the
         Company and all Related Corporations by reason of his or her disability
         (as defined in the Plan),  this option may be exercised,  to the extent
         otherwise  exercisable  on the  date of the  termination  of his or her
         employment, at any time within 180 days after such termination, but not
         later than the scheduled expiration date.

                  (c) Effect of  Termination.  At the  expiration of the 180-day
         period  provided  in  paragraphs  (a) or (b) of this  Section  5 or the
         scheduled expiration date, whichever is the earlier,  this option shall
         terminate  (and  shall no longer be  exercisable)  and the only  rights
         hereunder shall be those as to which the option was properly  exercised
         before  such  termination.  

         6. Partial  Exercise.  This option may be exercised in part at any time
and from time to time within the above  limits,  except that this option may not
be exercised  for a fraction of a share unless such  exercise is with respect to
the final  installment  of stock  subject  to this  option and cash in lieu of a
fractional  share must be paid, in accordance  with Paragraph 13(G) of the Plan,
to permit 

                                      -2-

<PAGE>

the Employee to exercise completely such final installment. Any fractional share
with respect to which an installment of this option cannot be exercised  because
of the  limitation  contained in the preceding  sentence shall remain subject to
this  option  and shall be  available  for later  purchase  by the  Employee  in
accordance with the terms hereof.

         7.  Payment  of  Price.  (a)  The  option  price  shall  be paid in the
following  manner:

                  (i)   in cash or by check;

                  (ii)  subject to Section 7(b) below,  by delivery of shares of
                        the  Company's  Common  Stock having a fair market value
                        (as determined by the Committee) equal as of the date of
                        exercise to the option price;

                  (iii) by delivery of an  assignment  satisfactory  in form and
                        substance to the Company of a  sufficient  amount of the
                        proceeds  from  the  sale of the  Option  Shares  and an
                        instruction  to the broker or selling  agent to pay that
                        amount to the Company; or

                  (iv)  by any combination of the foregoing.

                  (b) Limitations on Payment by Delivery of Common Stock. If the
         Employee  delivers  Common Stock held by the Employee  ("Old Stock") to
         the Company in full or partial payment of the option price, and the Old
         Stock so delivered is subject to restrictions or limitations imposed by
         agreement between the Employee and the Company, an equivalent number of
         Option  Shares  shall be subject to all  restrictions  and  limitations
         applicable  to the Old Stock to the extent that the  Employee  paid for
         the  Option  Shares  by  delivery  of Old  Stock,  in  addition  to any
         restrictions or limitations imposed by this Agreement.  Notwithstanding
         the foregoing,  the Employee may not pay any part of the exercise price
         hereof by  transferring  Common Stock to the Company unless such Common
         Stock has been owned by the Employee  free of any  substantial  risk of
         forfeiture for at least six months.  

                  (c) Permitted  Payment by Recourse Note. In addition,  if this
         paragraph is initialed  below by the person  signing this  Agreement on
         behalf of the Company,  the option price may be paid by delivery of the
         Employee's  three  year  personal  recourse   promissory  note  bearing
         interest payable not less than annually at the applicable Federal rate,
         as defined in Section  1274(d)  of the Code. 

                                    ---------
                                   (initials)

         8. Restrictions on Resale; Legend. Option Shares may not be transferred
without the Company's written consent except by will, by the laws of descent and
distribution  and in  accordance  with the  provisions of Sections 17 and 18, if
applicable. Option Shares will be of an illiquid nature and will be deemed to be
"restricted  securities"  for purposes of the Securities Act of 1933, as amended
(the "Securities Act"). Accordingly, such shares must be sold in compliance

                                      -3-
<PAGE>

with  the  registration  requirements  of the  Securities  Act  or an  exemption
therefrom.  Each  certificate  evidencing  any of the Option Shares shall bear a
legend substantially as follows:

         "The shares  represented  by this  certificate  are subject to
         restrictions  on  transfer  and  may not be  sold,  exchanged,
         transferred,  pledged,  hypothecated or otherwise  disposed of
         except in  accordance  with and  subject  to all the terms and
         conditions of a certain Incentive Stock Option Agreement dated
         as of  11/16/98,  a copy of which the Company  will furnish to
         the  holder  of this  certificate  upon  request  and  without
         charge."


         9. Method of Exercising Option.  Subject to the terms and conditions of
this Agreement, this option may be exercised by written notice to the Company at
its principal  executive  office, or to such transfer agent as the Company shall
designate.  Such notice shall state the election to exercise this option and the
number of Option  Shares for which it is being  exercised and shall be signed by
the  person  or  persons  so  exercising  this  option.  Such  notice  shall  be
accompanied  by  payment  of the full  purchase  price of such  shares,  and the
Company shall deliver a certificate or certificates  representing such shares as
soon as  practicable  after the notice shall be received.  Such  certificate  or
certificates  shall  be  registered  in the name of the  person  or  persons  so
exercising  this option (or, if this option  shall be  exercised by the Employee
and if the Employee shall so request in the notice exercising this option, shall
be registered in the name of the Employee and another person jointly, with right
of  survivorship).  In the event this  option  shall be  exercised,  pursuant to
Section 5 hereof, by any person or persons other than the Employee,  such notice
shall be accompanied by appropriate proof of the right of such person or persons
to  exercise  this  option.  

         10.  Option  Not  Transferable.  This  option  is not  transferable  or
assignable except by will or by the laws of descent and distribution. During the
Employee's  lifetime  only  the  Employee  can  exercise  this  option. 

         11. No Obligation to Exercise Option.  The grant and acceptance of this
option imposes no obligation on the Employee to exercise it.

         12. No  Obligation  to  Continue  Employment.  Neither  the Plan,  this
Agreement, nor the grant of this option imposes any obligation on the Company or
any Related Corporation to continue the Employee in employment. 

         13. No Rights as Stockholder until Exercise. The Employee shall have no
rights as a stockholder with respect to the Option Shares until such time as the
Employee has  exercised  this option by  delivering a notice of exercise and has
paid in full the purchase  price for the shares so exercised in accordance  with
Section 9. Except as is  expressly  provided in the Plan with respect to certain
changes in the  capitalization  of the Company,  no adjustment shall be made for
dividends  or similar  rights for which the record date is prior to such date of
exercise. 

         14.  Capital  Changes  and  Business  Successions.  The  Plan  contains
provisions  covering the treatment of options in a number of contingencies  such
as stock splits and mergers.  Provisions in the Plan for adjustment with respect
to  stock  subject  to  options  and the  related 

                                      -4-
<PAGE>

provisions  with respect to successors to the business of the Company are hereby
made applicable  hereunder and are incorporated  herein by reference.

         15. Early  Disposition.  The  Employee  agrees to notify the Company in
writing  immediately  after the Employee  transfers any Option  Shares,  if such
transfer  occurs on or before the later of (a) the date two years after the date
of this Agreement or (b) the date one year after the date the Employee  acquired
such Option  Shares.  The  Employee  also agrees to provide the Company with any
information  concerning  any  such  transfer  required  by the  Company  for tax
purposes.  

         16. Withholding Taxes. If the Company or any Related Corporation in its
discretion  determines  that it is obligated  to withhold any tax in  connection
with the exercise of this option,  or in connection with the transfer of, or the
lapse of restrictions on, any Common Stock or other property  acquired  pursuant
to this  option,  the  Employee  hereby  agrees  that the Company or any Related
Corporation  may withhold from the Employee's  wages or other  remuneration  the
appropriate  amount  of  tax.  At the  discretion  of  the  Company  or  Related
Corporation,  the amount  required to be  withheld  may be withheld in cash from
such  wages or other  remuneration  or in kind  from the  Common  Stock or other
property  otherwise  deliverable to the Employee on exercise of this option. The
Employee further agrees that, if the Company or any Related Corporation does not
withhold an amount from the Employee's wages or other remuneration sufficient to
satisfy the withholding  obligation of the Company or Related  Corporation,  the
Employee  will  make   reimbursement   on  demand,   in  cash,  for  the  amount
underwithheld.

         17.  Company  Right of First  Refusal. 

                  (a) Exercise of Right. If the Employee desires to transfer all
         or any part of the Option  Shares to any person  other than the Company
         (an  "Offeror"),   the  Employee  shall:   (i)  obtain  in  writing  an
         irrevocable  and  unconditional  bona fide offer (the  "Offer") for the
         purchase  thereof from the Offeror;  and (ii) give written  notice (the
         "Option Notice") to the Company setting forth the Employee's  desire to
         transfer  such shares,  which Option Notice shall be  accompanied  by a
         photocopy  of the  Offer  and  shall  set  forth at least  the name and
         address  of the  Offeror  and the price and  terms of the  Offer.  Upon
         receipt of the Option  Notice,  the  Company  shall have an  assignable
         option to  purchase  any or all of such  Option  Shares  (the  "Company
         Option  Shares")  specified  in the Option  Notice,  such  option to be
         exercisable  by  giving,  within 30 days  after  receipt  of the Option
         Notice, a written  counternotice to the Employee. If the Company elects
         to  purchase  any or all of such  Company  Option  Shares,  it shall be
         obligated to purchase,  and the Employee  shall be obligated to sell to
         the  Company,  such  Company  Option  Shares  at the  price  and  terms
         indicated  in the Offer within 30 days from the date of delivery by the
         Company of such  counter-notice.  

                  (b) Sale of Option Shares to Offeror. The Employee may, for 60
         days after the  expiration  of the 30-day option period as set forth in
         Section 17(a), sell to the Offeror, pursuant to the terms of the Offer,
         any or all of such Company  Option Shares not purchased or agreed to be
         purchased by the Company or its assignee;  provided,  however, that the
         Employee  shall not sell such Company  Option Shares to such Offeror if
         such  Offeror is a  competitor  of the Company  and the  Company  gives
         written  notice to the  Employee,  within

                                      -5-

<PAGE>


         30 days of its receipt of the Option Notice,  stating that the Employee
         shall not sell his or her Company  Option Shares to such  Offeror;  and
         provided,  further,  that prior to the sale of such Option Shares to an
         Offeror,  such  Offeror  shall  execute an  agreement  with the Company
         pursuant to which such Offeror agrees to be subject to the restrictions
         set  forth in this  Section  17. If any or all of such  Company  Option
         Shares are not sold  pursuant  to an Offer  within  the time  permitted
         above,  the unsold  Company  Option Shares shall remain  subject to the
         terms of this  Section  17.  

                  (c)  Adjustments  for Changes in Capital  Structure.  If there
         shall be any change in the Common Stock of the Company  through merger,
         consolidation, reorganization,  recapitalization, stock dividend, stock
         split, combination or exchange of shares, or the like, the restrictions
         contained in Section 8 and this Section 17 shall apply with equal force
         to additional  and/or  substitute  securities,  if any, received by the
         Employee in  exchange  for,  or by virtue of his or her  ownership  of,
         Option Shares, except as otherwise determined by the Board of Directors
         of the Company.  

                  (d) Failure to Deliver Option Shares. If the Employee fails or
         refuses  to  deliver  on a  timely  basis  duly  endorsed  certificates
         representing  Company  Option  Shares to be sold to the  Company or its
         assignee  pursuant to this Section 17, the Company shall have the right
         to deposit  the  purchase  price for such  Company  Option  Shares in a
         special  account with any bank or trust company in the  Commonwealth of
         Massachusetts, giving notice of such deposit to the Employee, whereupon
         such Company  Option  Shares shall be deemed to have been  purchased by
         the Company. All such monies shall be held by the bank or trust company
         for the benefit of the Employee.  All monies deposited with the bank or
         trust company but  remaining  unclaimed for two years after the date of
         deposit  shall be repaid by the bank or trust company to the Company on
         demand,  and the Employee shall thereafter look only to the Company for
         payment. 

                  (e)  Expiration  of  Company's  Right  of  First  Refusal  and
         Transfer Restrictions.  The first refusal rights of the Company and the
         transfer restrictions set forth above shall remain in effect until such
         time, if ever, as a distribution to the public is made of shares of the
         Company's Common Stock pursuant to a registration statement filed under
         the Securities Act, at which time the refusal rights of the Company and
         the transfer  restrictions set forth herein will automatically  expire.


         18. Company's Right of Repurchase. 

                  (a) Right of Repurchase. The Company shall have the right (the
         "Repurchase  Right") to  repurchase  all,  but no less than all, of the
         Option  Shares from the holder of this option,  upon the  occurrence of
         any of the events  specified  in Section  18(b) below (the  "Repurchase
         Event"). The Repurchase Right may be exercised by the Company within 60
         days  following the later of the date of the exercise of this option or
         the date the  Company  receives  actual  knowledge  of such  event (the
         "Repurchase  Period").  The Repurchase  Right shall be exercised by the
         Company by giving the holder  written  notice on or before the last day
         of the  Repurchase  Period of its intention to exercise the  Repurchase
         Right,  and,  together  with such  notice,  tendering  to the holder an
         amount  equal  to (i) in the  case of an  event  specified  in  Section
         18(b)(i)  or (ii) below,  the  greater of the option  price or the fair
         market value of the shares,  and (ii) in the case of an event

                                      -6-
<PAGE>

         specified in Section  18(b)(iii) or (iv) below,  the option price.  The
         Company may assign the  Repurchase  Right to one or more persons.  Upon
         timely exercise of the Repurchase  Right in the manner provided in this
         Section  18(a),  the  holder  shall  deliver to the  Company  the stock
         certificate or certificates  representing the shares being repurchased,
         duly  endorsed  and free and clear of any and all  liens,  charges  and
         encumbrances.

         If shares are not purchased  under the Repurchase  Right,  the Employee
and his or her  successor in interest,  if any, will hold any such shares in his
or her possession subject to all of the provisions of this Agreement.


                  (b) Company's Right to Exercise  Repurchase Right. The Company
         shall have the Repurchase  Right in the event that any of the following
         events shall occur:

                  (i)    The   receivership,   bankruptcy  or  other  creditor's
                         proceeding  regarding the Employee or the taking of any
                         of  Employee's  shares  acquired  upon exercise of this
                         option by legal process, such as a levy of execution;

                  (ii)   Distribution  of shares held by the  Employee to his or
                         her spouse as such spouse's joint or community interest
                         pursuant to a decree of dissolution,  operation of law,
                         divorce, property settlement agreement or for any other
                         reason,  except as may be  otherwise  permitted  by the
                         Company;

                  (iii)  The termination of the Employee's  employment for Cause
                         (as defined in Section 4(c) hereof); or

                  (iv)   Within one year of the  termination  of the  Employee's
                         employment   with   the   Company   and   all   Related
                         Corporations for any reason whatsoever,  the engagement
                         by the Employee, directly or indirectly,  alone or with
                         others,  in  (a)  any  business  activity  which  is in
                         competition with the Company or any Related Corporation
                         or  (b)  the  solicitation  of,  interference  with  or
                         endeavor to entice away any  employee of the Company or
                         any Related Corporation.

                  (c)  Determination of Fair Market Value. The fair market value
         of the  Option  Shares  shall be,  for  purposes  of this  Section  18,
         determined in accordance  with  paragraph 6D of the Plan as of the date
         of the Repurchase Event. The determination by the Board of Directors of
         the fair market value shall be conclusive  and binding.

                  (d) Expiration of Company's  Repurchase  Right. The Repurchase
         Right  shall  remain in effect  until  such time,  if ever,  as (i) the
         Option Shares are  transferred in accordance  with Section 17 hereof or
         (ii) a  distribution  to the public is made of shares of the  Company's
         Common Stock  pursuant to an  effective  registration  statement  filed
         under the Securities  Act.


         19. Lock-up  Agreement.  The Employee agrees that in connection with an
underwritten public offering of Common Stock, upon the request of the Company or
the principal  underwriter 

                                      -7-

<PAGE>

managing  such public  offering,  this  Option and the Option  Shares may not be
sold,  offered  for sale or  otherwise  disposed  of without  the prior  written
consent of the  Company or such  underwriter,  as the case may be, for up to 180
days after the  effectiveness of the registration  statement filed in connection
with such offering,  or such longer period of time as the Board of Directors may
determine if all of the Company's  directors and officers  agree to be similarly
bound.  The lock-up  agreement  established  pursuant  to this  Section 19 shall
remain  effective  until the Option  and/or  the  Option  Shares are sold to the
public pursuant to an effective  registration statement or an exemption from the
registration  requirements of the Securities Act.

         20. Arbitration. Any dispute,  controversy, or claim arising out of, in
connection  with,  or  relating  to the  performance  of this  Agreement  or its
termination   shall  be  settled  by   arbitration   in  the   Commonwealth   of
Massachusetts,  pursuant to the rules then obtaining of the American Arbitration
Association.  Any award shall be final,  binding and conclusive upon the parties
and a judgment rendered thereon may be entered in any court having  jurisdiction
thereof.  

         21. Provision of  Documentation to Employee.  By signing this Agreement
the Employee  acknowledges receipt of a copy of this Agreement and a copy of the
Plan. 

         22.  Acceleration of Vesting of Option after an Acquisition.  As of the
effective  date of an  Acquisition,  as  defined  in  paragraph  13 of the Plan,
one-half of the Option  Shares  granted to the Employee  that are unvested as of
the effective date of the Acquisition  shall become fully vested and exercisable
by the Employee immediately prior to the effective date of the Acquisition.  The
remaining  unvested  Option  Shares  shall  continue to vest over the  remaining
vesting period on a pro-rata  basis,  with the amount  scheduled to vest on each
vesting date in the remaining  vesting period reduced by one half. The foregoing
notwithstanding,  the Board of Directors,  in its sole  discretion,  may require
that the Employee's rights under this paragraph shall be conditioned on approval
by stockholders of the Company in accordance with Section  280G(b)(5)(B)  of the
Code and regulations thereunder. Notwithstanding the foregoing, no Option Shares
granted pursuant to this Agreement shall become vested and exercisable  pursuant
to this  paragraph and Employee shall not acquire any rights as a result of this
paragraph,  if the  acceleration  or vesting  of any such  Option  Shares  would
prevent the Company from accounting for a particular  business  combination as a
"pooling of  interests"  pursuant to the terms and  conditions of APB 16 and the
rules  and  regulations   promulgated  thereunder  (or  any  successor  rule  or
pronouncement)  at any time when the Board of  Directors  deems it  desirable to
account  for  such  business  combination  as  a  "pooling  of  interests." 

         23.  Miscellaneous.  

                  (a)  Notices.  All notices  hereunder  shall be in writing and
         shall be  deemed  given  when sent by  certified  or  registered  mail,
         postage  prepaid,  return receipt  requested,  to the address set forth
         below.  The addresses for such notices may be changed from time to time
         by written notice given in the manner  provided for herein.

                  (b) Entire Agreement; Modification. This Agreement constitutes
         the entire agreement between the parties relative to the subject matter
         hereof,  and supersedes  all proposals,  written or oral, and all other
         communications  between the parties  relating to the

                                      -8-
<PAGE>

         subject  matter  of this  Agreement  This  Agreement  may be  modified,
         amended  or  rescinded  only by a written  agreement  executed  by both
         parties. 

                  (c)  Severability.     The    invalidity,     illegality    or
         unenforceability  of any  provision of this  Agreement  shall in no way
         affect the validity, legality or enforceability of any other provision.

                  (d)  Successors and Assigns.  This Agreement  shall be binding
         upon  and  inure  to  the  benefit  of the  parties  hereto  and  their
         respective successors and assigns, subject to the limitations set forth
         in  Section 10 hereof.

                  (e)  Governing  Law. This  Agreement  shall be governed by and
         interpreted  in  accordance  with  the  laws  of  the  Commonwealth  of
         Massachusetts, without giving effect to the principles of the conflicts
         of laws thereof.



                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]


                                      -9-
<PAGE>

<TABLE>


         IN WITNESS  WHEREOF,  the  Company  and the  Employee  have caused this
instrument to be executed as of the date first above written.

<CAPTION>
<S>                                                           <C>

                                                              NBX CORPORATION
                                                              100 Brickstone Square
         -----------------------------------                  Andover, MA 01810
         Employee

         -----------------------------------                  By: -----------------------------------
         Print Name of Employee                                   Alexander Laats
                                                                  Chairman and COO

         -----------------------------------
         Street Address

         -----------------------------------
         City     State    Zip Code

</TABLE>


                                      -10-





                                   Exhibit 5.1


                        WILSON SONSINI GOODRICH & ROSATI


                            PROFESSIONAL CORPORATION


                               650 PAGE MILL ROAD
                        PALO ALTO, CALIFORNIA 94304-1050

                  TELEPHONE 650-493-9300 FACSIMILE 650-493-6811

                                 March 12, 1999

3Com Corporation
5400 Bayfront Plaza
Santa Clara, CA 95052

         Re:Registration Statement on Form S-8
         NBX Corporation 1996 Stock Plan and NBX Corporation 1998 Stock Plan

Ladies and Gentlemen:

         We  have  examined  the   Registration   Statement  on  Form  S-8  (the
"Registration   Statement")  to  be  filed  by  3Com  Corporation,   a  Delaware
corporation  (the  "Company"  or  "you"),   with  the  Securities  and  Exchange
Commission on or about March 12, 1999, in connection with the registration under
the  Securities  Act of 1933, as amended (the "Act"),  of 509,912 shares of your
Common Stock, $0.01 par value (the "Shares"),  reserved for issuance pursuant to
the NBX  Corporation  1996  Stock Plan and the NBX  Corporation  1998 Stock Plan
(collectively the "Plans").  As your legal counsel, we have reviewed the actions
proposed to be taken by you in connection with the proposed sale and issuance of
the Shares by the Company under the Plans.

         It is our opinion that,  upon completion of the actions being taken, or
contemplated  by us as your  counsel to be taken by you prior to the issuance of
the Shares  pursuant  to the  Registration  Statement  and the  Plans,  and upon
completion of the actions being taken in order to permit such transactions to be
carried out in accordance  with the securities  laws of the various states where
required,  the  Shares  will be  legally  and  validly  issued,  fully  paid and
nonassessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement and further  consent to the use of our name wherever  appearing in the
Registration Statement, the Prospectus, and any subsequent amendment thereto.


                                      Very truly yours,

                                      /s/ WILSON SONSINI GOODRICH & ROSATI, P.C.
                                      ------------------------------------------
                                      WILSON SONSINI GOODRICH & ROSATI
                                      Professional Corporation





                                  Exhibit 23.1


             CONSENT OF DELOITTE & TOUCHE LLP, INDEPENDENT AUDITORS

         We consent  to the  incorporation  by  reference  in this  Registration
Statement  of 3Com  Corporation  on Form S-8 of our report  dated June 23,  1998
appearing  in the Annual  Report on Form 10-K of 3Com  Corporation  for the year
ended May 31, 1998.

/s/ DELOITTE & TOUCHE LLP
- --------------------------
DELOITTE & TOUCHE LLP


San Jose, California
March 11, 1999






                                  Exhibit 23.2


             CONSENT OF GRANT THORNTON LLP, INDEPENDENT ACCOUNTANTS

         We consent  to the  incorporation  by  reference  in this  Registration
Statement  on  Form  S-8  and  related  prospectus(es)  pertaining  to  the  NBX
Corporation  1996 Stock Plan and NBX  Corporation  1998 Stock Plan of our report
dated  November 4, 1996,  included in 3Com  Corporation's  Annual Report on Form
10-K for the fiscal year ended May 31, 1998,  with  respect to the  consolidated
financial  statements and schedule of U.S. Robotics Corporation and Subsidiaries
for the year ended September 29, 1996 not included therein.


                                                    /s/ GRANT THORNTON LLP
                                                    ----------------------------
                                                    GRANT THORNTON LLP



Chicago, Illinois
March 11, 1999




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