TERADYNE INC
S-8, 1995-12-01
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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- -------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-8

                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

                                 TERADYNE, INC.
             (Exact Name of Registrant as Specified in Its Charter)

        Massachusetts                                  04-2272148
(State or Other Jurisdiction of             (I.R.S. Employer Identification No.)
Incorporation or Organization)

                              321 Harrison Avenue
                          Boston, Massachusetts 02118
                    (Address of Principal Executive Offices)
                              --------------------

                Megatest Corporation Director Stock Option Plan
                  Megatest Corporation 1990 Stock Option Plan
                            (Full Title of the Plan)
                              --------------------

                                Owen W. Robbins
                            Executive Vice President
                                 Teradyne, Inc.
                              321 Harrison Avenue
                          Boston, Massachusetts 02118
                    (Name and Address of Agent For Service)

                                  617-482-2700
         (Telephone Number, Including Area Code, of Agent For Service)
                              --------------------
                                   Copies to:

Donald G. Leka, Esq.    William B. Asher, Jr., Esq.  Harry K. Plant, Esq.
Teradyne, Inc.          Testa, Hurwitz & Thibeault   Wilson, Sonsini, Goodrich 
321 Harrison Avenue     High Street Tower            & Rosati
Boston, Massachusetts   125 High Street              Professional Corporation
02118                   Boston, Massachusetts 02110  650 Page Mill Road
                                                     Palo Alto, California 94304

                    Total of sequentially numbered pages: 38
                 Exhibit index on sequentially numbered page:9
- -------------------------------------------------------------------------------
<PAGE>
                                      -2-
<TABLE>
======================================================================================================

                        CALCULATION OF REGISTRATION FEE

======================================================================================================
<CAPTION>
                      


                                                 Proposed         Proposed
                                                 Maximum          Maximum
Title of Securities        Amount to be        Offering Price     Aggregate              Amount of
 to be Registered           Registered           Per Share      Offering Price        Registration Fee                            
===================        ============        ==============   ==============        ================             
<S>                      <C>                     <C>              <C>                    <C> 
Megatest Corporation 1990 Stock Option Plan

Teradyne Common Stock,   580,673 shares  (1)     $23.57 (2)       $13,686,463            $4,720
$.125 par value


Megatest Corporation Director Stock Option Plan

Teradyne Common Stock,   22,728 shares  (1)      $23.57 (2)       $   535,699            $  185
$.125 par value


        TOTAL:           603,401 shares                                                  $4,905

======================================================================================================
<FN>

      (1) Based on 663,734 Megatest Options granted as of December 1, 1995 under
the 1990 Stock Option Plan or the Director  Stock Option Plan, as applicable and
using a  conversion  ratio of 0.9091  shares of Teradyne  common  stock for each
share of Megatest common stock.

     (2) Estimated  soley for the purpose of calculating  the  registration  fee
pursuant to Rule  457(h)(1) and Rule 457(c) under the Securities Act of 1933, as
amended,  and  based  upon the  average  of the high and low sale  prices of the
Common Stock on The New York Stock Exchange on November 27, 1995.

</FN>
</TABLE>




<PAGE>
                                      -3-


                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

Item 1.  Plan Information.

         The documents containing the information  specified in this Item 1 will
be sent or  given  to  employees,  directors  or  others  as  specified  by Rule
428(b)(1).  In accordance  with the rules and  regulations of the Securities and
Exchange  Commission (the  "Commission")  and the instructions to Form S-8, such
documents  are not  being  filed  with  the  Commission  either  as part of this
Registration  Statement or as prospectuses or prospectus supplements pursuant to
Rule 424.

Item 2.  Registrant Information and Employee Plan Annual Information.

         The documents containing the information  specified in this Item 2 will
be sent or given to employees as specified by Rule 428(b)(1). In accordance with
the rules and  regulations of the Commission and the  instructions  to Form S-8,
such  documents are not being filed with the  Commission  either as part of this
Registration  Statement or as prospectuses or prospectus supplements pursuant to
Rule 424.

                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference.

         The following  documents  filed by the  Registrant  with the Commission
pursuant to the Securities Exchange Act of 1934, as amended (the "Exchange Act")
are  incorporated  in this  Registration  Statement  by  reference  as of  their
respective dates (File No. 1-6462):

         (a) The  Registrant's  Annual  Report on Form 10-K for the fiscal  year
         ended  December  31,  1994 filed  pursuant  to the  Exchange  Act which
         contains  audited  financial  statements  for  the  fiscal  year  ended
         December 31, 1994.

         (b) The  Registrant's  Quarterly  Reports  on Form 10-Q for the  fiscal
         quarters ended April 2, 1995, July 2, 1995, as amended,  and October 1,
         1995, filed pursuant to the Exchange Act.

                  All  other  documents  filed  by the  Registrant  pursuant  to
         Section  13(a) or 15(d) of the Exchange Act since the end of the fiscal
         year covered by the annual report referred to in (a) above.

         (c) The section entitled "Description of Registrant's  Securities to be
         Registered"  contained in the  Registrant's  Registration  Statement on
         Form 8-A filed  pursuant to Section  12(b) of the Exchange Act on April
         10, 1979.

         All documents  subsequently filed with the Commission by the Registrant
pursuant to Sections  13(a),  13(c),  14 and 15(d) of the Exchange Act, prior to
the filing of a  post-effective  amendment  which  indicates that all securities
offered herein have been sold or which deregisters all securities then remaining
<PAGE>
                                      -4-

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.  Interest of Named Experts and Counsel.

         Not applicable.

Item 6.  Indemnification of Directors and Officers.

         Section 67 of the Massachusetts Business Corporation Law ("Section 67")
provides  that a  corporation  may  indemnify  its directors and officers to the
extent  specified in or authorized by (i) the articles of  organization,  (ii) a
by-law adopted by the stockholders,  or (iii) a vote adopted by the holders of a
majority of the shares of stock  entitled to vote on the election of  directors.
In all instances,  the extent to which a corporation provides indemnification to
its  directors  and  officers  under  Section 67 is optional.  The  Registrant's
By-laws  provide that each  director  and officer  shall be  indemnified  by the
Registrant  against  liabilities  and  expenses  in  connection  with any  legal
proceeding  to which such  officer or  director  may become a party by reason of
being or having  been an officer or  director,  unless such  indemnification  is
prohibited by the  Massachusetts  Business  Corporation  Law. The Registrant has
also entered into  indemnity  agreements  with each of its directors and certain
executive  officers,  which agreements  require the Registrant to indemnify such
individuals to the fullest extent permitted by Massachusetts law.

         The  Registrant's  Restated  Articles  of  Organization  eliminate  the
personal liability of the Registrant's directors for monetary damages for breach
of their  fiduciary duty as directors to the  Registrant  and its  stockholders,
notwithstanding  any provision of law imposing such liability.  The Registrant's
Articles  of  Organization,   however,   do  not  eliminate   liability  of  the
Registrant's  directors (i) for breach of the director's  duty of loyalty to the
Registrant or its stockholders,  (ii) for acts or omissions not in good faith or
which involve intentional  misconduct or a knowing violation of law, (iii) under
Section 61 or 62 of the Massachusetts  Business Corporation Law, or (iv) for any
transaction from which the director derived an improper personal benefit.

Item 7.  Exemption From Registration Claimed.

         Not applicable.

Item 8.  Exhibits.

Exhibit No.       Description of Exhibit
- -----------       ----------------------  
4.1               Megatest Corporation 1990 Stock Option Plan

4.2               Megatest Corporation Director Stock Option Plan

5.1               Opinion of Testa, Hurwitz & Thibeault
<PAGE>
                                      -5-

23.1              Consent of Coopers & Lybrand L.L.P.

23.5              Consent of Testa,Hurwitz & Thibeault (included in Exhibit 5.1)

24.1              Power of Attorney (found on Page 8 of this Registration 
                  Statement)

Item 9.  Undertakings.

         (a)      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:

                           (i)      To include any prospectus required by 
                           Section 10(a)(3)of the Securities Act of 1933;

                           (ii) To reflect in the prospectus any facts or events
                           arising after the effective date of the  registration
                           statement   (or  the   most   recent   post-effective
                           amendment  thereof)  which,  individually  or in  the
                           aggregate,  represent  a  fundamental  change  in the
                           information set forth in the registration  statement.
                           Notwithstanding   the  foregoing,   any  increase  or
                           decrease  in volume  of  securities  offered  (if the
                           total dollar value of  securities  offered  would not
                           exceed that which was  registered)  and any deviation
                           from  the low or high  end of the  estimated  maximum
                           offering  range  may  be  reflected  in the  form  of
                           prospectus filed with the Commission pursuant to Rule
                           424(b) (ss.  230.424(b)  of this  chapter) if, in the
                           aggregate,  the changes in volume and price represent
                           no more than a 20%  change in the  maximum  aggregate
                           offering  price  set  forth  in the  "Calculation  of
                           Registration Fee" table in the effective registration
                           statement;

                           (iii)  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;

provided,  however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
information  required to be included in the  post-effective  amendment  by those
paragraphs is contained in periodic reports filed by the Registrant  pursuant to
Section  13 or Section  15(d) of the  Securities  Exchange  Act of 1934 that are
incorporated by reference 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) 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 Securities  Exchange Act of 1934 (and,  where  applicable,
<PAGE>
                                      -6-

         each filing of an employee  benefit  plan's annual  report  pursuant to
         Section  15(d)  of  the  Securities  Exchange  Act  of  1934)  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.

         (c)  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  foregoing
         provisions,  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.



<PAGE>
                                      -7-


                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Registrant
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 Boston, Massachusetts, on the 1st day of December, 1995.

                                                  TERADYNE, INC.


                                                  By:/s/ Owen W. Robbins
                                                     ---------------------- 
                                                     Owen W. Robbins
                                                     Executive Vice President
                                                     and Chief Financial Officer


                        POWER OF ATTORNEY AND SIGNATURES

      We, the  undersigned  officers and  directors of  Teradyne,  Inc.,  hereby
severally  constitute and appoint  Alexander V. d'Arbeloff,  Owen W. Robbins and
Richard J. Testa,  and each of them singly,  our true and lawful  attorneys with
full power to them, and each of them singly,  to sign for us and in our names in
the capacities  indicated below,  the Registration  Statement filed herewith and
any  and all  amendments  thereto  (including  post-effective  amendments),  and
generally to do all such things in our names and on our behalf in our capacities
as officers and directors to enable Teradyne, Inc. to comply with the provisions
of the  Securities  Act  of  1933,  as  amended,  and  all  requirements  of the
Securities  and  Exchange  Commission,   hereby  ratifying  and  confirming  our
signatures as they may be signed by our said attorneys,  or any of them, to said
Registration Statement and any and all amendments thereto.

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

<TABLE>
<CAPTION>

      Signature                               Title(s)                                      Date
      ---------                               --------                                      ----
<S>                                           <C>                                           <C>

/s/ Alexander V. d'Arbeloff                   President and Chairman of the Board           December 1, 1995
- ---------------------------                   (Principal Executive Officer)                                                         
Alexander V. d'Arbeloff                       

/s/ Owen W. Robbins                           Executive Vice President and                  December 1, 1995
- -------------------                           Director                                                              
Owen W. Robbins                               (Principal Financial Officer)
                                              

/s/ Donald J. Hamman                          Controller                                    December 1, 1995
- --------------------                          (Principal Accounting Officer)                                                        
Donald J. Hamman                              

/s/ Edwin L. Artzt                            Director                                      December 1, 1995
- ------------------                                                                                          
Edwin L. Artzt

/s/ Albert Carnesale                          Director                                      December 1, 1995
- --------------------
Albert Carnesale
<PAGE>

                                      -8-

                                              Director                                      December  , 1995
- ---------------------
Daniel S. Gregory

/s/ Dwight H. Hibbard                         Director                                      December 1, 1995
- ---------------------                                                                                       
Dwight H. Hibbard

/s/ John P. Mulroney                          Director                                      December 1, 1995
- --------------------                                                                                        
John P. Mulroney

/s/ James A. Prestridge                       Director                                      December 1, 1995
- -----------------------                                                                                     
James A. Prestridge

/s/ Richard J. Testa                          Director                                      December 1, 1995
- --------------------                                                                                        
Richard J. Testa
</TABLE>




<PAGE>
                                      -9-

<TABLE>
<CAPTION>

                                 EXHIBIT INDEX


                                                                           Page Number
                                                                           in Sequentially
Exhibit No.       Description                                              Numbered Copy
- -----------       -----------                                              ---------------
<S>               <C>                                                      <C>    



4.1               Megatest Corporation 1990 Stock Option Plan              10

4.2               Megatest Corporation Director Stock Option Plan          22

5.1               Opinion of Testa, Hurwitz & Thibeault                    35

23.1              Consent of Coopers & Lybrand L.L.P.                      37

23.5              Consent of Testa, Hurwitz & Thibeault (included in       
                  Exhibit 5.1)                                             --

24.1              Power of Attorney (found on Page 8 of this Registration
                  Statement)                                               --
</TABLE>
<PAGE>

                                      -10-

                                 Exhibit 4.1
<PAGE>
                                      -11-

                              MEGATEST CORPORATION

                             1990 STOCK OPTION PLAN

                   (As amended and restated January 12, 1995)



         1. Purposes of the Plan.  The purposes of this Stock Option Plan are to
attract and retain the best  available  personnel for  positions of  substantial
responsibility, to provide additional incentive to the Employees and Consultants
of the Company and to promote the success of the Company's business.

            Options  granted  hereunder  may  be  either  Incentive  Stock
Options or  Nonstatutory  Stock  Options,  at the discretion of the Board and as
reflected in the terms of the written option agreement.

         2. Definitions.  As used herein, the following definitions shall apply:

                  (a)      "Board" shall mean the Committee, if one has been  or
the Board of Directors appointed, of the Company, if no Committee is appointed.

                  (b)      "Code" shall mean the Internal Revenue Code of 1986, 
as amended.
                  (c)      "Committee"  shall mean the  Committee  appointed by 
the Board of Directors in accordance with paragraph (a) of Section 4 of the 
Plan, if one is appointed.

                  (d)      "Common Stock" shall mean the Common Stock of the 
Company.
                  (e)      "Company" shall mean Megatest Corporation, a  
Delaware corporation.
                  (f)      "Consultant" shall mean any person who is engaged by 
the Company or any Parent or Subsidiary  to  render  consulting services  and is
compensated  for such  consulting  services,  and any  director  of the  Company
whether  compensated  for such services or not provided that if and in the event
the Company registers any class of any equity security pursuant to Section 12 of
the Securities  Exchange Act of 1934, as amended (the "Exchange  Act"), the term
Consultant  shall  thereafter not include  directors who are not compensated for
their services or are paid only a director's fee by the Company.

                  (g)      "Continuous  Status as an Employee or  Consultant" 
shall mean the absence of any  interruption or termination of service as an
Employee or Consultant. Continuous Status as an Employee or Consultant shall not
be considered  interrupted  in the case of sick leave,  military  leave,  or any
other leave of absence approved by the Board;  provided that such leave is for a
period  of not more than 90 days or  reemployment  upon the  expiration  of such
leave is guaranteed by contract or statute.
<PAGE>
                                      -12-

                  (h)      "Employee" shall mean any person, including officers 
and  directors,  employed by the Company or any Parent or Subsidiary of the
Company.  The payment of a director's fee by the Company shall not be sufficient
to constitute "employment" by the Company.

                  (i)      "Incentive  Stock Option" shall mean an Option 
intended  to qualify as an  incentive  stock  option  within the meaning of
Section 422 of the Code.

                  (j)      "Nonstatutory Stock Option" shall mean an Option not 
intended to qualify as an Incentive Stock Option.

                  (k)      "Option" shall mean a stock option granted pursuant
to the Plan.

                  (l)      "Optioned Stock" shall mean the Common Stock subject 
to an Option.

                  (m)      "Optionee" shall mean an Employee or Consultant who 
receives an Option.

                  (n)      "Parent" shall mean a "parent corporation", whether 
now or hereafter existing, as defined in Section 424(e) of the Code.

                  (o)      "Plan" shall mean this 1990 Stock Option Plan, as 
amended from time to time.

                  (p)      "Share" shall mean a share of the Common Stock, 
as adjusted in accordance with Section a11 of the Plan.

                  (q)      "Subsidiary" shall mean a "subsidiary corporation", 
whether now or hereafter existing, as defined in Section 424(f) of the Code.

         3.       Stock Subject to the Plan.

                  (a)      Reserved Shares. Subject to the provisions of  
Section 11 of the Plan, the maximum aggregate number of shares which may be
optioned and sold under the Plan is 1,875,000 shares of Common Stock. The Shares
may be authorized, but unissued, or reacquired Common Stock.

                  (b)      Unpurchased  Shares.  If an Option should expire or 
become  unexercisable for any reason without having been exercised in full,
the unpurchased  Shares which were subject thereto shall,  unless the Plan shall
have  been  terminated,  become  available  for  future  grant  under  the Plan.
Notwithstanding  any other  provision of the Plan,  shares issued under the Plan
and later repurchased by the Company shall not become available for future grant
or sale under the Plan.

                  (c)      Annual Grant Limitation.In any fiscal year, the Board
may not grant  options  to  purchase a number of shares  greater  than five
percent (5%) of the shares of the Company's  Common Stock  outstanding the first
day of each such  fiscal  year.  The  number of shares  issuable  under  options
granted in any fiscal year shall be calculated  net of the  aggregate  number of
shares  subject to canceled,  terminated or expired  options  during such fiscal
year.  In the event  that the Board  grants  options to  purchase  less than the
aggregate number shares available for grant in a fiscal year, such deficit would
be added to the shares available for grant in the subsequent fiscal year.
<PAGE>
                                      -13-

         4.       Administration of the Plan.

                  (a)      Procedure.

                           (i)      Multiple Administrative Bodies. If 
         permitted by Rule 16b-3, the Plan may be administered by different  
         bodies with respect to Directors, Officers who are not Directors, and
         Employees who are neither Directors nor Officers.
         
                           (ii)     Administration With Respect to Directors and
         Officers  Subject to Section 16(b).  With respect to Option grants made
         to  Employees  who are also  Officers or  Directors  subject to Section
         16(b) of the Exchange  Act, the Plan shall be  administered  by (A) the
         Board,  if the Board may  administer  the Plan in  compliance  with the
         rules  governing  a plan  intended to qualify as a  discretionary  plan
         under  Rule  16b-3,  or (B) a  committee  designated  by the  Board  to
         administer  the Plan,  which  committee  shall be constituted to comply
         with the rules  governing a plan intended to qualify as a discretionary
         plan under Rule 16b-3. Once appointed, such Committee shall continue to
         serve in its designated capacity until otherwise directed by the Board.
         From time to time the Board may increase the size of the  Committee and
         appoint additional members,  remove members (with or without cause) and
         substitute new members, fill vacancies (however caused), and remove all
         members of the Committee and thereafter  directly  administer the Plan,
         all to the extent  permitted by the rules  governing a plan intended to
         qualify as a discretionary plan under Rule 16b-3.

                           (iii)    Administration With Respect to Other Persons
         With respect to Option grants made to Employees or Consultants  who are
         neither  Directors  nor  Officers  of the  Company,  the Plan  shall be
         administered  by (A) the  Board or (B) a  committee  designated  by the
         Board,  which  committee  shall be  constituted  to  satisfy  state and
         federal  laws.  Once  appointed,  such  Committee  shall  serve  in its
         designated  capacity until otherwise  directed by the Board.  The Board
         may increase the size of the Committee and appoint additional  members,
         remove members (with or without cause) and substitute new members, fill
         vacancies (however caused), and remove all members of the Committee and
         thereafter directly administer the Plan, all to the extent permitted by
         state and federal laws.

                  (b) Powers of the Administrator.  Subject to the provisions of
the  Plan,  and in the  case of a  Committee,  subject  to the  specific  duties
delegated  by the Board to such  Committee,  the  Administrator  shall  have the
authority, in its discretion:

                           (i)      to determine the Fair Market Value of the 
         Common Stock, in accordance with Section 8(b) of the Plan;

                           (ii)     to select the Consultants and Employees to 
         whom Options may be granted hereunder;
<PAGE>
                                      -14-

                           (iii)    to determine whether and to what extent 
         Options are granted hereunder;

                           (iv)     to determine the number of shares of Common 
         Stock to be covered by each Option granted hereunder;

                           (v)      to approve forms of agreement for use under 
         the Plan;

                           (vi)     to  determine  the  terms  and  conditions, 
         not inconsistent  with  the  terms of the Plan, of  any  award  granted
         hereunder.  Such terms and conditions include,  but are not limited to,
         the  exercise  price,  the time or times when  Options may be exercised
         (which may be based on performance criteria),  any vesting acceleration
         or waiver of forfeiture restrictions, and any restriction or limitation
         regarding  any Option or the shares of Common Stock  relating  thereto,
         based in each case on such  factors as the  Administrator,  in its sole
         discretion, shall determine;

                           (vii)    to reduce the exercise  price of any Option 
         to the then current Fair Market Value if the Fair  Market  Value of the
         Common Stock covered by such Option shall have declined  since the date
         the Option was granted;

                           (viii)   to construe and interpret the terms of the 
         Plan;         

                           (ix)     to prescribe, amend and rescind rules and 
         regulations relating to the Plan;

                           (x)      to modify or amend each Option (subject to 
         Section 13(a) of the Plan);         

                           (xi)     to authorize any person to execute on behalf
         of the Company any instrument required to effect the grant of an 
         Option  previously granted by the Administrator;

                           (xii)    to institute an Option Exchange Program;

                           (xiii)   to determine the terms and restrictions 
         applicable to Options and any Restricted Stock; and

                           (xiv)    to make all other determinations deemed 
         necessary or advisable for administering the Plan.

                  (c)      Effect of Administrator's Decision. 
The Administrator's decisions,  determinations and interpretations shall be
final and binding on all Optionees and any other holders of Options.
<PAGE>
                                      -15-

         5.       Eligibility.

                  (a) Nonstatutory Stock Options may be granted to Employees and
Consultants.  Incentive  Stock  Options  may be granted  only to  Employees.  An
Employee or  Consultant  who has been  granted an Option may, if he is otherwise
eligible, be granted an additional Option or Options.

                  (b) Each Option  shall be  designated  in the  written  option
agreement as either an Incentive  Stock Option or a  Nonstatutory  Stock Option.
However,  notwithstanding  such  designations,  to the extent that the aggregate
fair market  value of the Shares with  respect to which  Options  designated  as
Incentive  Stock  Options  are  exercisable  for the first time by any  Optionee
during any calendar year (under all plans of the Company) exceed $100,000,  such
Options shall be treated as Nonstatutory Stock Options.

                  (c) For purposes of Section 5(b),  Options shall be taken into
account in the order in which they were  granted,  and the fair market  value of
the Shares  shall be  determined  as of the time the Option with respect to such
Shares is granted.

                  (d) The Plan shall not confer upon any Optionee any right with
respect to  continuation  of  employment  or  consulting  relationship  with the
Company, nor shall it interfere in any way with his right or the Company's right
to terminate  his  employment or consulting  relationship  at any time,  with or
without cause.

                  (e) The following limitations shall apply to grants of 
Options to Employees:

                           (i) No Employee shall be granted,  in any fiscal year
         of the Company, Options to purchase more than 250,000 Shares.

                           (ii)  In   connection   with   his  or  her   initial
         employment,  an  employee  may be granted  options to purchase up to an
         additional  250,000  shares which shall not count against the limit set
         forth in Section 5(e)(i) above.

                           (iii) The  foregoing  limitations  shall be  adjusted
         proportionately   in  connection  with  any  change  in  the  Company's
         capitalization as described in Section 11.

                           (iv) If an Option is canceled in the same fiscal year
         of the Company in which it was granted (other than in connection with a
         transaction  described  in Section  11),  the  canceled  Option will be
         counted  against  the  limit  set forth in  Section  5(e)(i).  For this
         purpose, if the exercise price of an Option is reduced, the transaction
         will be treated as a cancellation  of the Option and the grant of a new
         Option.

         6.       Term of Plan. The Plan shall become effective upon the  
earlier to occur of its  adoption by the Board of Directors or its approval
by the  stockholders  of the Company.  It shall continue in effect for a term of
ten (10) years unless sooner terminated under Section 13 of the Plan.
<PAGE>
                                      -16-

         7. Term of Option.  The term of each  Option  shall be no more than ten
(10)  years  from the  date of  grant  thereof  or such  shorter  term as may be
provided in the Option Agreement.  However,  in the case of an Option granted to
an Optionee who, at the time the Option is granted, owns stock representing more
than ten  percent  (10%) of the  voting  power  of all  classes  of stock of the
Company or any Parent or  Subsidiary,  the term of the Option  shall be five (5)
years from the date of grant  thereof or such shorter term as may be provided in
the Option Agreement.

         8.       Exercise Price and Consideration.

                  (a) The per Share  exercise  price for the Shares to be issued
pursuant to exercise of an Option  shall be such price as is  determined  by the
Board, but shall be subject to the following:

                           (i)      In the case of an Incentive Stock Option

                                    (A)     granted to an Employee who, at the 
         time of the grant of such Incentive Stock Option, owns stock 
         representing more than ten percent (10%) of the voting power of all 
         classes of stock of the Company or any Parent or  Subsidiary,  the per 
         Share  exercise  price shall be no less than 110% of the fair market 
         value per Share on the date of grant.         

                                    (B)     granted to any Employee, the per 
         Share exercise price shall be no less than 100% of the fair market 
         value per Share on the date of grant.

                           (ii)     In the case of a Nonstatutory Stock Option

                                    (A)     granted to a person who, at the  
         time of the grant of such Option, owns stock representing more than  
         ten percent (10%) of the voting power of all classes of stock of the 
         Company or any Parent or Subsidiary, the per Share  exercise price 
         shall be no less than 110% of the fair market value per Share on the 
         date of the grant.

                                    (B)     granted to any person, the per 
         Share exercise price may be less than 100%,  but not less than 85%, of 
         the  fair market value per Share on the date of grant if the Board 
         determines  that a discount from the fair market value is appropriate  
         in lieu of the  payment of a  reasonable amount of salary or a cash 
         bonus to the optionee.
         
                           (iii) In the case of an  Option  granted  on or after
         the effective date of  registration  of any class of equity security of
         the Company pursuant to Section 12 of the Exchange Act and prior to six
         months  after  the  termination  of such  registration,  the per  Share
         exercise  price shall be no less than 100% of the fair market value per
         Share on the date of grant.

                  (b) The fair market value shall be  determined by the Board in
its discretion;  provided,  however, that where there is a public market for the
Common  Stock,  the fair market value per Share shall be the mean of the bid and
asked  prices (or the closing  price per share if the Common  Stock is listed on
the National  Association of Securities Dealers Automated  Quotation  ("NASDAQ")
National  Market) of the Common Stock for the date of grant,  as reported in the
<PAGE>
                                      -17-

Wall Street  Journal (or, if not so reported,  as otherwise  reported by NASDAQ)
or, in the event the Common Stock is listed on a stock exchange, the fair market
value per Share shall be the closing price on such exchange on the date of grant
of the Option, as reported in the Wall Street Journal.

                  (c) The  consideration  to be paid for the Shares to be issued
upon exercise of an Option, including the method of payment, shall be determined
by the Board at the time of grant and may  consist  entirely  of (i) cash,  (ii)
check, (iii) promissory note, (iv) other Shares of Common Stock which (x) either
have  been  owned  by the  Optionee  more  than  six (6)  months  on the date of
surrender or were not acquired,  directly or indirectly,  from the Company,  and
(y) have a fair market  value on the date of  surrender  equal to the  aggregate
exercise  price of the Shares as to which said Option  shall be  exercised,  (v)
delivery  of a  properly  executed  exercise  notice  together  with such  other
documentation  as the Board and the  broker,  if  applicable,  shall  require to
effect an exercise of the Option and delivery to the Company of the sale or loan
proceeds  required  to pay the  exercise  price,  (vi) any  combination  of such
methods of payment,  or (vii) such other consideration and method of payment for
the issuance of Shares to the extent permitted under applicable law.

         9.       Exercise of Option.

                  (a)  Procedure  for  Exercise;  Rights as a  Stockholder.  Any
Option  granted  hereunder  shall be  exercisable  at such  times and under such
conditions  as  determined  by the Board,  including  performance  criteria with
respect to the Company and/or the Optionee,  and as shall be  permissible  under
the terms of the Plan.

                       An Option may not be  exercised  for a fraction  of a
Share.

                       An Option shall be deemed to be exercised when written 
notice of such  exercise has been given to the Company in  accordance  with
the terms of the Option by the person  entitled to exercise  the Option and full
payment for the Shares with  respect to which the Option is  exercised  has been
received  by the  Company.  Full  payment  may, as  authorized  by the Board and
reflected in the Option  Agreement,  consist of any  consideration and method of
payment  allowable  under  Section  8(c) of the  Plan.  Until the  issuance  (as
evidenced  by the  appropriate  entry on the books of the  Company  or of a duly
authorized  transfer agent of the Company) of the stock  certificate  evidencing
such  Shares,  no right to vote or receive  dividends  or any other  rights as a
stockholder shall exist with respect to the Optioned Stock,  notwithstanding the
exercise of the Option.  The  Company  shall issue (or cause to be issued)  such
stock  certificate  promptly upon exercise of the Option.  No adjustment will be
made for a dividend  or other  right for which the  record  date is prior to the
date the stock  certificate  is issued,  except as provided in Section 11 of the
Plan.

                       Exercise of an Option in any manner shall result in a 
decrease in the number of Shares which  thereafter  may be available,  both
for purposes of the Plan and for sale under the Option,  by the number of Shares
as to which the Option is exercised.
<PAGE>
                                      -18-

                  (b) Termination of Status as an Employee or Consultant. In the
event of  termination  of an  Optionee's  Continuous  Status as an  Employee  or
Consultant,  such  Optionee  may, but only within sixty (60) days (or such other
period  of  time,  not  exceeding  three  (3)  months  as is  determined  by the
Administrator,  with such determination in the case of an Incentive Stock Option
being  made  at the  time  of  grant  of the  Option)  after  the  date  of such
termination  (but in no event later than the date of  expiration  of the term of
such Option as set forth in the Option  Agreement),  exercise  his Option to the
extent that he was entitled to exercise it at the date of such  termination.  To
the extent that he was not  entitled to exercise  the Option at the date of such
termination,  or if he does not exercise  such Option  (which he was entitled to
exercise) within the time specified herein, the Option shall terminate.

                  (c) Disability of Optionee.  Notwithstanding the provisions of
Section 9(b) above,  in the event of  termination  of an  Optionee's  Continuous
Status as an  Employee  or  Consultant  as a result  of his total and  permanent
disability (as defined in Section 22(e)(3) of the Code), he may, but only within
twelve (12) months from the date of such termination (but in no event later than
the date of  expiration  of the term of such  Option as set forth in the  Option
Agreement),  exercise his Option to the extent he was entitled to exercise it at
the date of such termination. To the extent that he was not entitled to exercise
the Option at the date of  termination,  or if he does not exercise  such Option
(which he was entitled to exercise) within the time specified herein, the Option
shall terminate.

                  (d) Death of Optionee.  In the event of the death of an 
Optionee:
                           (i)  during the term of the Option who is at the time
         of his death an  Employee  or  Consultant  of the Company and who shall
         have been in Continuous  Status as an Employee or Consultant  since the
         date of grant of the Option,  the Option may be exercised,  at any time
         within twelve (12) months  following the date of death (but in no event
         later  than the date of  expiration  of the term of such  Option as set
         forth in the Option Agreement), by the Optionee's estate or by a person
         who   acquired   the  right  to  exercise  the  Option  by  bequest  or
         inheritance,  but only to the  extent  the  Optionee  was  entitled  to
         exercise the Option at the date of death; or

                           (ii) within  sixty (60) days (or such other period of
         time  not   exceeding   three  (3)  months  as  is  determined  by  the
         Administrator,  with  such  determination  in the case of an  Incentive
         Stock Option  being made at the time of grant of the Option)  after the
         termination  of  Continuous  Status as an Employee or  Consultant,  the
         Option  may be  exercised,  at  any  time  within  twelve  (12)  months
         following  the date of death  (but in no event  later  than the date of
         expiration  of the  term of such  Option  as set  forth  in the  Option
         Agreement),  by the  Optionee's  estate or by a person who acquired the
         right to exercise the Option by bequest or inheritance, but only to the
         extent  of the  right  to  exercise  that  had  accrued  at the date of
         termination.

                  (e) Rule 16b-3.  Options granted to persons subject to Section
16(b) of the  Exchange  Act must comply with Rule 16b-3 and shall  contain  such
additional  conditions or restrictions as may be required  thereunder to qualify
for the maximum  exemption  from  Section 16 of the Exchange Act with respect to
Plan transactions.
<PAGE>
                                      -19-

         10.      Non-Transferability of Options.  The Option may not be sold, 
pledged, assigned, hypothecated,  transferred, or disposed of in any manner
other  than  by  will  or by the  laws of  descent  or  distribution  and may be
exercised, during the lifetime of the Optionee, only by the Optionee.

         11.      Adjustments Upon Changes in Capitalization, Dissolution, 
                  Merger, Asset Sale or Change of Control.

                  (a) Changes in Capitalization.  Subject to any required action
by the stockholders of the Company, the number of shares of Common Stock covered
by each outstanding  Option, and the number of shares of Common Stock which have
been  authorized for issuance under the Plan but as to which no Options have yet
been  granted  or which  have been  returned  to the Plan upon  cancellation  or
expiration of an Option,  as well as the price per share of Common Stock covered
by each such  outstanding  Option,  shall be  proportionately  adjusted  for any
increase or decrease in the number of issued  shares of Common  Stock  resulting
from a  stock  split,  reverse  stock  split,  stock  dividend,  combination  or
reclassification  of the Common Stock,  or any other increase or decrease in the
number  of  issued  shares  of  Common  Stock   effected   without   receipt  of
consideration  by  the  Company;  provided,  however,  that  conversion  of  any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of  consideration."  Such adjustment shall be made by the Board,
whose  determination  in that respect  shall be final,  binding and  conclusive.
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 of Common Stock subject to an Option.

                  (b) Dissolution or  Liquidation.  In the event of the proposed
dissolution or liquidation of the Company,  to the extent that an Option has not
been  previously   exercised,   it  will  terminate  immediately  prior  to  the
consummation  of such proposed  action.  However,  in the event the Common Stock
becomes  listed on a national  securities  exchange or is designated or approved
for designation  upon notice of issuance as a national market system security on
an  interdealer  quotation  system by NASDAQ,  such that the exemption  provided
under  Section  25100(o) of the  California  Corporations  Code, as in effect on
January 1, 1992,  applies to the Common Stock, the Board may,  alternatively and
in the exercise of its sole discretion,  declare that any Option shall terminate
as of a date fixed by the Board and give each Optionee the right to exercise his
or her Option as to all or any part of the Optioned Stock,  including  Shares as
to which the Option would not otherwise be exercisable.

                  (c)  Merger  or Asset  Sale.  In the  event of a merger of the
Company with or into another  corporation,  or the sale of substantially  all of
the  assets of the  Company,  each  outstanding  Option  shall be  assumed or an
equivalent option or right shall be substituted by the successor  corporation or
a Parent or  Subsidiary  of the  successor  corporation.  Moreover,  subject  to
subsection (d) below, in the event the Common Stock becomes listed on a national
securities  exchange or is designated or approved for designation upon notice of
issuance as a national market system security on an interdealer quotation system
by NASDAQ,  such that the  exemption  provided  under  Section  25100(o)  of the
California  Corporations  Code, as in effect on January 1, 1992,  applies to the
Common Stock,  and in the further event that the successor  corporation does not
<PAGE>
                                      -20-

agree to assume the Option or to substitute an equivalent  option or right,  the
Administrator shall, in lieu of such assumption or substitution, provide for the
Optionee to have the right to exercise  the Option as to all or a portion of the
Optioned  Stock,  including  Shares  as to  which  it  would  not  otherwise  be
exercisable.  If the  Administrator  makes  an  Option  exercisable  in  lieu of
assumption  or  substitution  in the  event of a merger or sale of  assets,  the
Administrator  shall  notify  the  Optionee  that  the  Option  shall  be  fully
exercisable for a period of fifteen (15) days from the date of such notice,  and
the Option will terminate  upon the expiration of such period.  For the purposes
of this  paragraph,  the Option shall be  considered  assumed if,  following the
merger or sale of assets, the option or right confers the right to purchase, for
each Share of  Optioned  Stock  subject to the Option  immediately  prior to the
merger or sale of assets,  the  consideration  (whether  stock,  cash,  or other
securities  or property)  received in the merger or sale of assets by holders of
Common Stock for each Share held on the effective date of the  transaction  (and
if holders were  offered a choice of  consideration,  the type of  consideration
chosen by the  holders  of a  majority  of the  outstanding  Shares);  provided,
however, that if such consideration received in the merger or sale of assets was
not  solely  common  stock  of the  successor  corporation  or its  Parent,  the
Administrator  may,  with  the  consent  of the  successor  corporation  and the
participant,  provide for the  consideration to be received upon the exercise of
the Option, for each Share of Optioned Stock subject to the Option, to be solely
common  stock of the  successor  corporation  or its Parent equal in fair market
value to the per share consideration  received by holders of Common Stock in the
merger or sale of assets.

         12. Time of Granting Options. The date of grant of an Option shall, for
all purposes,  be the date on which the Board makes the  determination  granting
such  Option.  Notice of the  determination  shall be given to each  Employee or
Consultant  to whom an Option is so granted  within a reasonable  time after the
date of such grant.

         13. Amendment and Termination of the Plan.

                  (a)  Amendment  and  Termination.  The  Board  may at any time
amend,  alter,  suspend or discontinue  the Plan, but no amendment,  alteration,
suspension or discontinuation shall be made which would impair the rights of any
Optionee  under any grant  theretofore  made,  without  his or her  consent.  In
addition,  to the extent necessary and desirable to comply with Rule 16b-3 under
the Exchange Act (or any other applicable law or regulation),  the Company shall
obtain stockholder approval of any Plan amendment in such a manner and to such a
degree as required.

                  (b) Effect of Amendment or Termination.  Any such amendment or
termination  of the Plan  shall not  affect  Options  already  granted  and such
Options  shall  remain  in full  force  and  effect as if this Plan had not been
amended or terminated.

         14.  Conditions  Upon  Issuance of Shares.  Shares  shall not be issued
pursuant to the exercise of an Option unless the exercise of such Option and the
issuance  and  delivery of such Shares  pursuant  thereto  shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933,  as amended,  the  Exchange  Act,  the rules and  regulations  promulgated
thereunder,  state  securities  laws and the  requirements of any stock exchange
upon which the Shares  may then be listed,  and shall be further  subject to the
<PAGE>
                                      -21-

approval of counsel for the Company with respect to such compliance.

              As a condition to the  exercise of an Option,  the Company may
require the person  exercising  such Option to represent and warrant at the time
of any such exercise that the Shares are being purchased only for investment and
without  any  present  intention  to sell or  distribute  such Shares if, in the
opinion of counsel for the Company,  such a representation is required by any of
the aforementioned relevant provisions of law.

         15.  Reservation of Shares.  The Company, during the term of this  
Plan, will at all times reserve and keep available such number of Shares as
shall be sufficient to satisfy the requirements of the Plan.

              The  inability  of the  Company to obtain  authority  from any
regulatory body having jurisdiction,  which authority is deemed by the Company's
counsel to be necessary to the lawful issuance and sale of any Shares hereunder,
shall relieve the Company of any liability in respect of the failure to issue or
sell  such  Shares  as to which  such  requisite  authority  shall not have been
obtained.

         16.  Option Agreement.  Options shall be evidenced by written option 
agreements in such form as the Board shall approve.

                                      -22-

                                  Exhibit 4.2
<PAGE>
                                      -23-

                              MEGATEST CORPORATION

                           DIRECTOR STOCK OPTION PLAN


         1. Purpose of the Plan. The purposes of this Director Option Stock Plan
are to attract and retain the best  available  personnel  for service as Outside
Directors (as defined herein) of the Company, to provide additional incentive to
the Outside  Directors  of the Company to serve as  Directors,  and to encourage
their continued service on the Board.

                  All options granted hereunder shall be "nonstatutory stock 
options."

         2.       Definitions.  As used herein, the following definitions shall 
apply:
                  (a)      "Board" means the Board of Directors of the Company.

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

                  (c)      "Common Stock" means the Common Stock of the Company.

                  (d)      "Company" means the Megatest Corporation, a Delaware 
corporation.

                  (e)      "Continuous Status as a Director" means the absence 
of any interruption or termination of service as a Director.

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

                  (g)      "Employee"  means  any  person,  including  officers
and  Directors,  employed by the Company or any Parent or Subsidiary of the
Company.  The payment of a Director's fee by the Company shall not be sufficient
in and of itself to constitute "employment" by the Company.

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

                  (i)      "Fair Market Value" means, as of any date, the value 
of Common Stock determined as follows:


                           (i)      If the Common Stock is listed on any 
established  stock exchange or a national market system,  including without
limitation the National Market System of the National  Association of Securities
Dealers,  Inc. Automated Quotation ("NASDAQ") System, the Fair Market Value of a
Share of Common  Stock shall be the  closing  sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such system or exchange (or
the exchange with the greatest volume of trading in Common Stock) on the date of
grant  (or,  in the event  such date is not a market  trading  day,  on the last
market  trading day prior to the date of grant),  as reported in The Wall Street
Journal or such other source as the Board deems reliable;
<PAGE>
                                      -24-

                           (ii)     If the Common Stock is quoted on the NASDAQ 
System (but not on the National Market System thereof) or regularly  quoted
by a recognized securities dealer but selling prices are not reported,  the Fair
Market  Value of a Share of Common  Stock shall be the mean  between the bid and
asked  prices for the Common  Stock on the date of grant (or,  in the event such
date is not a market  trading  day, on the last market  trading day prior to the
date of grant),  as reported in The Wall Street  Journal or such other source as
the Board deems reliable, or;

                           (iii)    In the absence of an established market for 
the Common Stock, the Fair Market Value thereof shall be determined in good 
faith by the Board.
                  (j)      "Option" means a stock option granted pursuant to  
the Plan.

                  (k)      "Optioned Stock" means the Common Stock subject to 
Option.

                  (l)      "Optionee" means an Outside Director who receives an 
an Option.

                  (m)      "Outside Director" means a Director who is not an 
Employee.

                  (n)      "Parent" means a "parent corporation," whether now or
 hereafter existing, as defined in Section 424(e) of the Code.

                  (o)      "Plan" means this Director Stock Option Plan.

                  (p)      "Share" means a share of the Common Stock, as 
adjusted in accordance with Section 10 of the Plan.                             

                  (q)      "Subsidiary" means a "subsidiary corporation," 
whether now or hereafter existing, as defined in Section 424 (f) of the Code.

         3.       Stock Subject to the Plan.  Subject to the  provisions of 
Section 10 of the Plan, the maximum aggregate number of shares which may be
optioned and sold under the Plan is 50,000 Shares, as adjusted to give effect to
the 1-for-4  reverse stock split effected in December 1992, of Common Stock (the
"Pool"). The Shares may be authorized but unissued, or reacquired Common Stock.

                  If an Option  should  expire or become  unexercisable  for any
reason without having been exercised in full, the unpurchased  Shares which were
subject  thereto  shall,  unless  the Plan shall  have been  terminated,  become
available for future grant under the Plan.

         4.       Administration of and Grants of Options under the Plan.

                  (a)      Administrator.  Except as otherwise required herein, 
the Plan shall be administered by the Board.
<PAGE>
                                      -25-

                  (b)      Procedure  for Grants.  The  provisions  set forth 
in this  Section 4(b) shall not be amended more than once every six months,
other than to comport with changes in the Code, the Employee  Retirement  Income
Security Act of 1974, as amended, or the rules thereunder.  All grants of Option
to Outside  Directors  under this Plan shall be automatic and  non-discretionary
and shall be made strictly in accordance with the following provisions:

                           (i)      No person shall have any discretion to 
select which Outside Directors shall be granted Options or to determine the
number of Shares to be covered by Options granted to Outside Directors.

                           (ii)     Each Outside Director shall be  
automatically  granted an Option to purchase  5,000 Shares,  as adjusted to
give effect to the 1-for-4  reverse  stock split  effected in December 1992 (the
"First Option"),  on the date on which the later of the following events occurs:
(A) the closing date of the first firm commitment  underwritten  public offering
of the Common Stock  pursuant to an effective  Form S-1  registration  statement
under the  Securities  Act of 1933,  as amended,  covering the offer and sale of
Common  Stock for the  account  of the  Company,  or (B) the date on which  such
person  first  becomes an Outside  Director,  whether  through  election  by the
stockholders of the Company or appointment by the Board to fill a vacancy.

                           (iii)    Notwithstanding the provisions of  
subsection (ii) hereof,  any grant of an Option made before the Company has
obtained  stockholder  approval of the Plan in accordance with Section 16 hereof
shall be conditioned  upon obtaining  such  stockholder  approval of the Plan in
accordance with Section 16 hereof.

                           (iv)     The terms of a First Option granted 
hereunder shall be as follows:

                                    (A)     the term of the First Option  shall 
be ten (10) years.

                                    (B)     the First Option shall be 
     exercisable  only while the  Outside  Director  remains a  Director  of the
Company, except as set forth in Section 8 hereof.

                                    (C)     the exercise price per Share shall 
     be 100% of the  fair  market  value  per  Share on the date of grant of the
First Option.

                                    (D)     the First Option shall become 
     exercisable in installments  cumulatively as to  one-sixteenth  (1/16th) of
the Shares  subject to the First Option for every three months  elapsed from the
date of grant thereof.

                           (v)      In the event that any Option granted under 
the Plan would cause the number of Shares  subject to  outstanding  Options
plus the number of Shares previously purchased under Options to exceed the Pool,
then the  remaining  Shares  available  for Option grant shall be granted  under
Options to the Outside Directors on a pro rata basis. No further grants shall be
made until such time,  if any, as additional  Shares become  available for grant
under the Plan  through  action of the  stockholders  to increase  the number of
Shares which may be issued under the Plan or through  cancellation or expiration
of Options previously granted hereunder.
<PAGE>

                                      -26-

                  (c)      Powers  of  the  Board.  Subject  to the  provisions
and  restrictions  of the Plan, the Board shall have the authority,  in its
discretion:  (i) to  determine,  upon  review  of  relevant  information  and in
accordance  with Section  2(i) of the Plan,  the Fair Market Value of the Common
Stock;  (ii) to interpret the Plan; (iii) to prescribe,  amend and rescind rules
and regulations relating to the Plan; (iv) to authorize any person to execute on
behalf of the Company any  instrument  required  to  effectuate  the grant of an
Option previously  granted hereunder;  and (v) to make all other  determinations
deemed necessary or advisable for the administration of the Plan.

                  (d)      Effect of Board's Decision.  All decisions, 
determinations and interpretations of the Board shall be final.

         5.       Eligibility.  Options may be granted only to Outside 
Directors  holding less than five percent  (5%) of the  outstanding  Common
Stock. All Options shall be  automatically  granted in accordance with the terms
set forth in Section 4(b) hereof.

                  The Plan shall not  confer  upon any  Optionee  any right with
respect to  continuation  of service as a Director or  nomination  to serve as a
Director,  nor shall it  interfere in any way with any rights which the Director
or the Company may have to terminate his or her directorship at any time.

         6.       Term of Plan.  The Plan shall become  effective  upon the 
earlier  to occur of its  adoption  by the  Board  or its  approval  by the
stockholders  of the Company as  described  in Section 16 of the Plan.  It shall
continue in effect for a term of ten (10) years unless sooner  terminated  under
Section 11 of the Plan.

         7.       Exercise Price and Consideration.

                  (a)      Exercise Price.  The per Share exercise price for 
Optioned Stock shall be 100% of the Fair Market Value per Share on the date of 
grant of the Option.

                  (b)      Form of  Consideration.  The  consideration to be 
paid for the Shares to be issued upon exercise of an Option,  including the
method of payment,  shall be determined by the Board and may consist entirely of
(i) cash; (ii) check;  (iii) promissory note; (iv) other shares which (A) in the
case of Shares  acquired  upon  exercise  of an  Option,  have been owned by the
Optionee for more than six (6) months on the date of  surrender,  and (B) have a
Fair market Value on the date of surrender equal to the aggregate exercise price
of the Shares as to which said  Option  shall be  exercised;  (v)  delivery of a
properly executed exercise notice together with such other  documentation as the
Board and the broker, if applicable,  shall require to effect an exercise of the
Option and delivery to the Company of the sale or loan proceeds  required to pay
the exercise price; (vi) any combination of the foregoing methods of payment; or
(vii) such other  consideration and method of payment for the issuance of Shares
to the extent permitted under applicable law.
<PAGE>
                                      -27-

         8.       Exercise of Option.

                  (a)  Procedure  for  Exercise;  Rights as a  Stockholder.  Any
Option granted  hereunder shall be exercisable at such times as are set forth in
Section 4(b) hereof;  provided,  however,  that no Options shall be  exercisable
until stockholder  approval of the Plan in accordance with Section 16 hereof has
been obtained.

                  An Option may not be exercised for a fraction of a Share.

                  An Option shall be deemed to be exercised  when written notice
of such exercise has been given to the Company in  accordance  with the terms of
the Option by the person  entitled to exercise  the Option and full  payment for
the Shares with  respect to which the Option is exercised  has been  received by
the Company. Full payment may consist of any consideration and method of payment
allowable  under  Section 7(b) of the Plan.  Until the issuance (as evidenced by
the  appropriate  entry on the  books  of the  Company  or of a duly  authorized
transfer agent of the Company) of the stock certificate  evidencing such Shares,
no right to vote or receive dividends or any other rights as a stockholder shall
exist with respect to the Optioned  Stock,  notwithstanding  the exercise of the
Option. A share certificate for the number of Shares so acquired shall be issued
to the  Optionee  as  soon as  practicable  after  exercise  of the  Option.  No
adjustment  will be made for a dividend or other right for which the record date
is prior to the date the stock  certificate  is issued,  except as  provided  in
Section 10 of the Plan.

                  Exercise of an Option in any manner shall result in a decrease
in the number of Shares which thereafter may be available,  both for purposes of
the Plan and for sale under the Option,  by the number of Shares as to which the
Option is exercised.

                  (b)  Rule 16B-3.  Options  granted to Outside  Directors  must
comply  with the  applicable  provisions  of Rule  16b-3  promulgated  under the
Exchange  Act or  any  successor  thereto  and  shall  contain  such  additional
conditions  or  restrictions  as may be required  thereunder  to qualify for the
maximum  exemption  from  Section 16 of the  Exchange  Act with  respect to Plan
transactions.

                  (c)  Termination  of Continuous  Status as a Director.  In the
event an Optionee's  Continuous Status as a Director terminates (other than upon
the  Optionee's  death or total and permanent  disability (as defined in Section
22(e)(3) of the Code)),  the Optionee  may exercise his or her Option,  but only
within 60 days from the date of such  termination,  and only to the extent  that
the Optionee was entitled to exercise it at the date of such termination (but in
no event later than the expiration of its 10-year term).  To the extent that the
Optionee was not entitled to exercise an Option at the date of such termination,
and to the extent that the Optionee does not exercise such Option (to the extent
otherwise  so  entitled)  within the time  specified  herein,  the Option  shall
terminate.

                  (d)  Disability of Optionee. In the event Optionee's
Continuous  Status  as a  Director  terminates  as a result  of  total  and
permanent  disability (as defined in Section 22(e)(3) of the Code), the Optionee
may exercise his or her Option,  but only within 12 months from the date of such
termination,  and only to the extent that the  Optionee was entitled to exercise
it at the date of such termination (but in no event later than the expiration of
its 10-year term).  To the extent that the Optionee was not entitled to exercise
an Option at the date of  termination,  or if he or she does not  exercise  such
Option (to the extent otherwise so entitled)  within the time specified  herein,
the Option shall terminate.
<PAGE>
                                      -28-

                  (e)  Death of Optionee. In the event of an  Optionee's  death,
the Optionee's  estate or a person who acquired the right to exercise the Option
by bequest or  inheritance  may exercise  the Option,  but only within 12 months
following  the date of  death,  and only to the  extent  that the  Optionee  was
entitled  to  exercise  it at the date of death (but in no event  later than the
expiration  of its  10-year  term).  To the  extent  that the  Optionee  was not
entitled to exercise an Option at the date of death,  and to the extent that the
Optionee's  estate or a person who  acquired  the right to exercise  such Option
does not exercise such Option (to the extent  otherwise so entitled)  within the
time specified herein, the Option shall terminate.

         9.       Non-Transferability of Options.  The Option may not be sold, 
pledged, assigned, hypothecated,  transferred, or disposed of in any manner
other  than  by  will  or by the  laws of  descent  or  distribution  and may be
exercised, during the lifetime of the Optionee, only by the Optionee.

         10.      Adjustments Upon Changes in Capitalization, Dissolution, 
                  Merger, Asset Sale or Change of Control.

                  (a)  Changes in Capitalization. Subject to any required action
by the stockholders of the Company, the number of shares of Common Stock covered
by each outstanding  Option, and the number of shares of Common Stock which have
been  authorized for issuance under the Plan but as to which no Options have yet
been  granted  or which  have been  returned  to the Plan upon  cancellation  or
expiration of an Option,  as well as the price per share of Common Stock covered
by each such  outstanding  Option,  shall be  proportionately  adjusted  for any
increase or decrease in the number of issued  shares of Common  Stock  resulting
from a  stock  split,  reverse  stock  split,  stock  dividend,  combination  or
reclassification  of the Common Stock,  or any other increase or decrease in the
number  of  issued  shares  of  Common  Stock   effected   without   receipt  of
consideration  by  the  Company;  provided,  however,  that  conversion  of  any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of  consideration."  Such adjustment shall be made by the Board,
whose  determination  in that respect  shall be final,  binding and  conclusive.
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 of Common Stock subject to an Option.

                  (b)  Dissolution or  Liquidation. In the event of the proposed
dissolution or liquidation of the Company,  to the extent that an Option has not
been  previously   exercised,   it  will  terminate  immediately  prior  to  the
consummation  of such proposed  action.  However,  in the event the Common Stock
becomes  listed on a national  securities  exchange or is designated or approved
for designation  upon notice of issuance as a national market system security on
an  interdealer  quotation  system by NASDAQ,  such that the exemption  provided
under  Section  25100(o) of the  California  Corporations  Code, as in effect on
<PAGE>
                                      -29-

January 1, 1992,  applies to the Common Stock, the Board may,  alternatively and
in the exercise of its sole discretion,  declare that any Option shall terminate
as of a date fixed by the Board and give each Optionee the right to exercise his
or her Option as to all or any part of the Optioned Stock,  including  Shares as
to which the Option would not otherwise be exercisable.

                  (c)  Merger  or Asset  Sale.  In the  event of a merger of the
Company with or into another  corporation,  or the sale of substantially  all of
the  assets of the  Company,  each  outstanding  Option  shall be  assumed or an
equivalent option or right shall be substituted by the successor  corporation or
a Parent or  Subsidiary of the  successor  corporation.  In the event the Common
Stock  becomes  listed on a national  securities  exchange or is  designated  or
approved for  designation  upon notice of issuance as a national  market  system
security on an interdealer  quotation system by NASDAQ,  such that the exemption
provided  under  Section  25100(o) of the  California  Corporations  Code, as in
effect on January 1, 1992, applies to the Common Stock, and in the further event
that the  successor  corporation  does not  agree to  assume  the  Option  or to
substitute an equivalent  option or right, the  Administrator  shall, in lieu of
such assumption or  substitution,  provide for the Optionee to have the right to
exercise  the Option as to all or a portion  of the  Optioned  Stock,  including
Shares as to which it would not otherwise be exercisable.  If the  Administrator
makes an Option  exercisable in lieu of assumption or  substitution in the event
of a merger or sale of assets, the Administrator  shall notify the Optionee that
the Option shall be fully exercisable for a period of fifteen (15) days from the
date of such notice,  and the Option will  terminate upon the expiration of such
period.  For the  purposes of this  paragraph,  the Option  shall be  considered
assumed if, following the merger or sale of assets,  the option or right confers
the right to purchase,  for each Share of Optioned  Stock  subject to the Option
immediately prior to the merger or sale of assets,  the  consideration  (whether
stock,  cash, or other securities or property) received in the merger or sale of
assets by holders of Common Stock for each Share held on the  effective  date of
the transaction (and if holders were offered a choice of consideration, the type
of consideration chosen by the holders of a majority of the outstanding Shares);
provided,  however, that if such consideration received in the merger or sale of
assets was not solely common stock of the successor  corporation  or its Parent,
the  Administrator  may, with the consent of the successor  corporation  and the
participant,  provide for the  consideration to be received upon the exercise of
the Option, for each Share of Optioned Stock subject to the Option, to be solely
common  stock of the  successor  corporation  or its Parent equal in fair market
value to the per share consideration  received by holders of Common Stock in the
merger or sale of assets.

         11.      Amendment and Termination of the Plan.

                  (a)  Amendment and Termination. Except as set forth in Section
4, the Board may at any time amend, alter,  suspend or discontinue the Plan, but
no  amendment,  alteration,  suspension or  discontinuation  shall be made which
would  impair  the  rights of any  Optionee  under any grant  theretofore  made,
without his or her consent.  In addition,  to the extent necessary and desirable
to comply with Rule 16b-3 under the Exchange Act (or any other applicable law or
regulation), the Company shall obtain stockholder approval of any Plan amendment
in such a manner and to such a degree as required.
<PAGE>
                                      -30-

                  (b) Effect of Amendment or Termination.  Any such amendment or
termination  of the Plan  shall not  affect  Options  already  granted  and such
Options  shall  remain  in full  force  and  effect as if this Plan had not been
amended or terminated.

         12.      Time of Granting Options. The date of grant of an Option 
shall, for all purposes,  be the date determined in accordance with Section
4(b) hereof. Notice of the determination shall be given to each Outside Director
to whom an Option is so granted within a reasonable  time after the date of such
grant.
         13.      Conditions  Upon  Issuance of Shares.  Shares  shall not be 
issued  pursuant to the  exercise of an Option  unless the exercise of such
Option and the  issuance  and  delivery of such Shares  pursuant  thereto  shall
comply with all relevant provisions of law, including,  without limitation,  the
Securities Act of 1933, as amended,  the Exchange Act, the rules and regulations
promulgated thereunder, state securities laws, and the requirements of any stock
exchange upon which the Shares may then be listed,  and shall be further subject
to the approval of counsel for the Company with respect to such compliance.

                  As a condition to the  exercise of an Option,  the Company may
require the person  exercising  such Option to represent and warrant at the time
of any such exercise that the Shares are being purchased only for investment and
without any current  intention to sell or  distribute  such  Shares,  if, in the
opinion of counsel for the Company,  such a representation is required by any of
the aforementioned relevant provisions of law.

                  Inability  of  the  Company  to  obtain   authority  from  any
regulatory body having jurisdiction,  which authority is deemed by the Company's
counsel to be necessary to the lawful issuance and sale of any Shares hereunder,
shall relieve the Company of any liability in respect of the failure to issue or
sell  such  Shares  as to which  such  requisite  authority  shall not have been
obtained.

         14.      Reservation of Shares.  The Company, during the term of this 
Plan, will at all times reserve and keep available such number of Shares as
shall be sufficient to satisfy the requirements of the Plan.

         15.      Option Agreement.  Options shall be evidenced by written 
option agreements in such form as the Board shall approve.

         16.      Stockholder Approval.  Continuance of the Plan shall be 
subject to approval by the  stockholders  of the Company at or prior to the
first  annual  meeting of  stockholders  held  subsequent  to the granting of an
Option hereunder.  Such stockholder approval shall be obtained in the degree and
manner required under applicable state and federal law.
<PAGE>
                                      -31-

                              MEGATEST CORPORATION

                        DIRECTOR STOCK OPTION AGREEMENT


         Megatest Corporation, a Delaware corporation (the "Company"), has 
granted to -----------------------------------(the  "Optionee"),  an  option  to
purchase a total of 5,000 shares of the  Company's  Common Stock (the  "Optioned
Stock"), at the price determined as provided herein, and in all respects subject
to the terms,  definitions and provisions of the Director Stock Option Plan (the
"Plan")  adopted by the Company which is incorporated  herein by reference.  The
terms defined in the Plan shall have the same defined meanings herein.

         1.       Nature of the Option.  This Option is a nonstatutory option 
and is not intended to qualify for any special tax benefits to the Optionee.

         2.       Exercise  Price.  The exercise  price is $---- for each share 
of Common Stock, which is 100% of the Fair Market Value of the Common Stock
as determined on the date of grant of this Option.

         3.       Exercise of Option.  This Option shall be exercisable during 
its term in accordance with the provisions of Section 8 of the Plan as follows:

                  (a)      Right to Exercise.

                           (i)      This Option shall become exercisable in 
installments  cumulatively  with respect to  one-sixteenth  (1/16th) of the
Optioned  Stock for every three months  elapsed from the date of grant,  so that
one hundred percent (100%) of the Optioned Stock shall be exercisable four years
after the date of grant; provided, however, that in no event shall any Option be
exercisable prior to the date the stockholders of the Company approve the Plan.

                           (ii)     This Option may not be exercised for a 
fraction of a share.

                           (iii) In the event of Optionee's death,  disability 
is governed by Sections or other termination of service as a Director,  the
exercisability of the Option 6, 7 and 8 of this Agreement.

                  (b)      Method of Exercise. This Option shall be exercisable
by written  notice  which shall state the  election to exercise the Option,
the number of Shares in respect of which the Option is being exercised, and such
other  representations  and agreements as to the holder's investment intent with
respect  to such  Shares  of  Common  Stock as may be  required  by the  Company
pursuant to the  provisions of the Plan.  Such written notice shall be signed by
the  Optionee  and shall be  delivered  in person  or by  certified  mail to the
Secretary of the Company.  The written notice shall be accompanied by payment of
the exercise price.

         4.       Method of Payment.  Payment of the exercise price shall be by 
any of the following, or a combination thereof, at the election of the Optionee:
<PAGE>
                                      -32-

                  (a)      cash;

                  (b)      check;

                  (c)      surrender of other shares which (i) in the case of 
Shares acquired upon exercise of an Option, have been owned by the Optionee
for more than six months on the date of  surrender,  and (ii) have a Fair Market
Value on the date of  surrender  equal to the  aggregate  exercise  price of the
Shares as to which said Option shall be exercised; or

                  (d)      delivery of a properly  executed  exercise notice 
together  with such other  documentation  as the Board and the  broker,  if
applicable,  shall  require to effect an exercise of the Option and  delivery to
the Company of the sale or loan proceeds required to pay the exercise price.

         5.       Restrictions  on Exercise.  This Option may not be exercised 
if the issuance of such Shares upon such  exercise or the method of payment
of consideration  for such shares would constitute a violation of any applicable
federal or state  securities  or other law or  regulations,  or if such issuance
would not comply  with the  requirements  of any stock  exchange  upon which the
Shares may then be listed.  As a condition to the  exercise of this Option,  the
Company may  require  Optionee to make any  representation  and  warranty to the
Company as may be required by any applicable law or regulation.

         6.       Termination  of  Continuous  Status  as a  Director.  In the  
event Optionee's  Continuous  Status as a Director  terminates  (other than
upon the  Optionee's  death or  permanent  and total  disability  (as defined in
Section 22(e)(3) of the Code)), the Optionee may exercise his or her Option, but
only  within 60 days from the date of such  termination,  and only to the extent
that the Optionee  was  entitled to exercise it at the date of such  termination
(but in no event later than the expiration of its 10-year  term).  To the extent
that the Optionee  was not entitled to exercise  this Option at the date of such
termination,  and to the extent that  Optionee does not exercise this Option (to
the extent otherwise so entitled) within the time specified  herein,  the Option
shall terminate.

         7.       Disability of Optionee. In the event Optionee's Continuous 
Status as a  Director  terminates  as a result  of his total and  permanent
disability (as defined in Section  22(e)(3) of the Code),  Optionee may exercise
his or her Option,  but only within 12 months from the date of termination,  and
only to the extent that the  Optionee was entitled to exercise it at the date of
such  termination  (but in no event  later  than the date of  expiration  of its
10-year  term).  To the extent that  Optionee was not entitled to exercise  this
Option at the date of termination,  and to the extent Optionee does not exercise
this Option (to the extent  otherwise  so  entitled)  within the time  specified
herein, the Option shall terminate.

         8.       Death of  Optionee. In the  event  of the  Optionee's  death, 
the Optionee's  estate or a person who  acquired the right to  exercise the
Option by bequest or  inheritance  may exercise  the Option,  but only within 12
months following the date of death, and only to the extent that the Optionee was
entitled to exercise it at the date of death (but in no event later than the
<PAGE>
                                      -33-

date of  expiration  of its 10-year  term).  To the extent that Optionee was not
entitled  to  exercise  this  Option  at the date of  death,  and to the  extent
Optionee's  estate or a person who  acquired the right to exercise the Option by
bequest or inheritance does not exercise this Option (to the extent otherwise so
entitled) within the time specified herein, the Option shall terminate.

         9.       Non-Transferability of Option. This Option may not be
transferred in any manner  otherwise than by will or by the laws of descent
or distribution and may be exercised during the lifetime of Optionee only by the
Optionee.  The  terms of this  Option  shall  be  binding  upon  the  executors,
administrators, heirs, successors and assigns of the Optionee.

         10.      Term of Option.  This Option may not be exercised more than 
ten (10) years from the date of grant of this Option,  and may be exercised
during such term only in accordance with the Plan and the terms of this Option.

         11.      Taxation Upon Exercise of Option.  Optionee understands that, 
upon exercise of this Option,  he will recognize income for tax purposes in
an  amount  equal to the  excess  of the then Fair  Market  Value of the  Shares
purchased over the exercise  price paid for such Shares.  (Since the Optionee is
subject to Section 16(b) of the Securities Exchange Act of 1934, as amended, the
measurement  and timing of such  income may be  deferred,  and the  Optionee  is
advised to contact a tax advisor  concerning the desirability of filing an 83(b)
election in  connection  with the exercise of the Option.) Upon a resale of such
Shares by the  Optionee,  any  difference  between  the sale  price and the Fair
Market Value of the Shares on the date of exercise of the Option,  to the extent
not  included in income as described  above,  will be treated as capital gain or
loss.

DATE OF GRANT:
              -------------

                                                    MEGATEST CORPORATION,
                                                    a Delaware corporation

                                                    By:
                                                       ------------------------
                                                       
         Optionee acknowledges receipt of a copy of the Plan, a copy of which is
annexed hereto, and represents that he is familiar with the terms and provisions
thereof,  and  hereby  accepts  this  Option  subject  to all of the  terms  and
provisions thereof. Optionee hereby agrees to accept as binding,  conclusive and
final all decisions or  interpretations  of the Board upon any questions arising
under the Plan.

         Dated:
               ------------
                                    -------------------------------------------
                                    Optionee

<PAGE>
                                      -34-


                                   EXHIBIT A
                                   ---------

                MEGATEST CORPORATION DIRECTOR STOCK OPTION PLAN

                       NOTICE OF EXERCISE OF STOCK OPTION

Megatest Corporation
1321 Ridder Park Drive
San Jose, California  95131

Attention:  Secretary

Ladies and Gentlemen:

         The  undersigned  hereby elects to exercise the option  indicated below
with  respect to the number of shares of Common  Stock of  Megatest  Corporation
(the "Company") set forth:

         Option Grant Date:
                           ----------------------------------
         Type of Option:  Nonstatutory

         Number of Shares Being Exercised:
                                          ------------------- shares
         Exercise Price Per Share: $
                                    -------------------------
         Total Exercise Price: $
                                -----------------------------

         Method of Payment:       |_|     Cash
                                  |_|     Check
                                  |_|     Surrender of previously issued Shares
                                  |_|     Cashless Exercise

         Enclosed  herewith is payment in full of the total exercise price and a
copy of the Option Agreement.

         My exact name,  address and social  security number for purposes of the
stock certificates to be issued and the stockholder list of the Company are:

         Name:
                 ---------------------------------------------------
         Address:
                    ------------------------------------------------
         Social Security Number:
                                ------------------------------------

                                   Sincerely,

Dated:
      -------------------
                                   ---------------------------------
                                   (Optionee's Signature)

                                      -35-

                                  Exhibit 5.1
<PAGE>
                                      -36-




                                                                December 1, 1995


Teradyne, Inc.
321 Harrison Avenue
Boston, Massachusetts 02118

      Re:     Registration Statement on Form S-8 Relating to the
              Megatest Corporation 1990 Stock Option Plan
              and the Megatest Corporation Director Stock Option
              Plan (collectively, the "Plans")     
              --------------------------------

Ladies and Gentlemen:

      Reference is made to the  above-captioned  Registration  Statement on Form
S-8 (the "Registration  Statement") filed by Teradyne, Inc. (the "Company") with
the  Securities  and Exchange  Commission  under the  Securities Act of 1933, as
amended,  relating to an aggregate of 603,401 shares of Common  Stock, $.125 par
value, of the Company (the "Shares").

      We are counsel to the Company and are familiar with the proceedings of its
stockholders  and Board of  Directors.  We have  examined  original or certified
copies of the Company's certificate of incorporation,  as amended, the Company's
by-laws,  as amended,  the corporate  records of the Company to the date hereof,
and such other certificates,  documents, records and materials as we have deemed
necessary in connection with this opinion letter.

      We are members only of the Bar of the  Commonwealth of  Massachusetts  and
are  not  experts  in,  and  express  no  opinion  regarding,  the  laws  of any
jurisdiction  other than the Commonwealth of Massachusetts and the United States
of America, and the General Corporation Law of the State of Delaware.

      Based upon and subject to the  foregoing,  we are of the opinion  that the
Shares issued or proposed to be issued by the Company pursuant to the Plans will
be, upon receipt of the consideration provided for in the Plans, validly issued,
fully paid and  nonassessable  after issuance of such Shares in accordance  with
the terms of the Plans.

      We hereby  consent  to the filing of this  opinion  as Exhibit  5.1 to the
Registration Statement.

                               Very truly yours,


                               /s/ Testa, Hurwitz & Thibeault
                               TESTA, HURWITZ & THIBEAULT


<PAGE>

                                      -37-

                                  Exhibit 23.1
                                  ------------
<PAGE>
                                      -38-

                       CONSENT OF INDEPENDENT ACCOUNTANTS



We consent to the incorporation by reference in this  registration  statement on
Form S-8 of our report dated January 20, 1995, on our audits of the consolidated
financial statements of Teradyne, Inc. as of December 31, 1994 and 1993, and for
each of the three years in the period ended December 31, 1994,  appearing in the
Annual  Report on Form 10-K of  Teradyne,  Inc.  filed with the  Securities  and
Exchange Commission pursuant to the Securities Act of 1934.




                                                /s/ Coopers & Lybrand L.L.P.
                                                COOPERS & LYBRAND L.L.P.


Boston, Massachusetts
December 1, 1995



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