MEGADATA CORP
SC 13D, 1996-09-30
COMPUTER COMMUNICATIONS EQUIPMENT
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                    SECURITIES AND EXCHANGE COMMISSION
                          WASHINGTON, D.C.  20549
                                               
                            -------------------

                               SCHEDULE 13D
                 Under the Securities Exchange Act of 1934
                                            
                               -------------

                           MEGADATA CORPORATION
- --------------------------------------------------------------------------
                             (Name of Issuer)
                                     
Common Stock, Par Value 
     $.01 per Share                                585145105
- -----------------------------------   -----------------------------------
   (Title of class of securities)                (CUSIP number)

          G.S. Beckwith Gilbert                 Dennis J. Block, Esq. 
Field Point Capital Management Company         Weil Gotshal & Manges
          104 Field Point Road                    767 Fifth Avenue
          Green wich, CT 06830                New York, New York 10153
              (203) 629-8757                       (212) 310-8000
- --------------------------------------------------------------------------
    (Name, address and telephone number of person authorized to receive
                        notices and communications)

                             September 18, 1996
- --------------------------------------------------------------------------
          (Date of event which requires filing of this statement)


If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(b)(3) or (4), check the
following box   [_].


Check the following box if a fee is being paid with the statement   [x].


(A fee is not required only if the reporting person: (1) has a previous
statement on file reporting beneficial ownership of more than five percent
of the class of securities described in Item 1; and (2) has filed no
amendment subsequent thereto reporting beneficial ownership of five
percent or less of such class.)  (See Rule 13d-7.)


<PAGE>
<PAGE>


 CUSIP No. 585145105                       13D - Page 2           


     1     NAME OF REPORTING PERSON:     G.S. Beckwith Gilbert

           S.S. OR I.R.S. IDENTIFICATION NO.
           OF ABOVE PERSON:

     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:       (a) [_]
                                                                   (b) [_]

     3     SEC USE ONLY

     4     SOURCE OF FUNDS:*  PF

     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS             [_]
           REQUIRED PURSUANT TO ITEM 2(d) OR 2(e):

     6     CITIZENSHIP OR PLACE OF
           ORGANIZATION:                        United States


    NUMBER OF     7   SOLE VOTING POWER:        746,000**
     SHARES
  BENEFICIALLY    8   SHARED VOTING POWER:
    OWNED BY

      EACH        9   SOLE DISPOSITIVE POWER:   746,000**
    REPORTING
   PERSON WITH   10   SHARED DISPOSITIVE
                      POWER:

    11     AGGREGATE AMOUNT BENEFICIALLY
           OWNED BY REPORTING PERSON:           746,000**

    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)               [_]
           EXCLUDES CERTAIN SHARES:

    13     PERCENT OF CLASS REPRESENTED BY 
           AMOUNT IN ROW (11):                  32.3%

    14     TYPE OF REPORTING PERSON:            IN


*   SEE INSTRUCTIONS BEFORE FILLING OUT!
**  Of these shares, 16,000 shares are held in Mr. Gilbert's 
    IRA account and 700,000 shares are subject to a warrant.


<PAGE>
<PAGE>


Item 1.   Security and Issuer
          -------------------

          This statement relates to the shares of Common Stock, par value
$.01 per share (the "Common Stock"), of Megadata Corporation, a New York
corporation (the "Company"), the principal executive offices of which are
located at 35 Orville Drive, Bohemia, New York 11716. 

Item 2.   Identity and Background
          -----------------------

          This statement is being filed by Mr. G.S. Beckwith Gilbert.  Mr.
Gilbert's principal occupation is President, Chief Executive Officer and
Director of Field Point Capital Management Company, which is principally
engaged in the business of consulting and merchant banking.  His principal
address is 104 Field Point Road, Greenwich, Connecticut 06830.  Mr. Gilbert
is a citizen of the United States of America.

          During the last five years, Mr. Gilbert has not been convicted in
any criminal proceeding (excluding traffic violations or similar
misdemeanors) and has not been a party to a civil proceeding of a judicial
or administrative body of competent jurisdiction as a result of which he
was or is subject to a judgment, decree or final order enjoining future
violations of, or prohibiting or mandating actions subject to, federal or
state securities laws or finding any violations with respect to such laws.
<PAGE>
<PAGE>


Item 3.   Source and Amount of Funds or Other Consideration
          -------------------------------------------------

          Mr. Gilbert purchased in open market transactions 46,000 shares
of Common Stock for a total consideration of $54,380 (of which 16,000
shares of Common Stock were purchased by Mr. Gilbert's IRA account for
total consideration of $19,730).  Mr. Gilbert purchased from the Company,
(1) a secured promissory note in the principal amount of $100,000 (the
"Secured Promissory Note"), (2) a warrant to purchase 700,000 shares of
Common Stock for a term extending to October 15, 1996, subject to extension
(the "700,000 Share Warrant") and (3) a warrant to purchase, subject to
certain conditions, up to a total of 200,000 shares of Common Stock for a
term of three years (the "200,000 Share Warrant").  The cash payments made
by Mr. Gilbert for these shares of Common Stock, the Secured Promissory
Note and the Warrants were derived from his personal funds.

Item 4.   Purpose of Transaction
          ----------------------

          On September 18, 1996, Mr. Gilbert acquired from the Company the
Secured Promissory Note and the Warrants.  The acquisition was consummated
pursuant to the terms of a Securities Purchase Agreement (the "Purchase
Agreement"), dated as of September 18, 1996, between Mr. Gilbert and the
Company.

          Mr. Gilbert has acquired his shares of Common Stock and the
Warrants for the purposes of investment and to obtain a significant equity
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<PAGE>


interest in the Company.  From and after the exercise of the 700,000 Share
Warrant and continuing thereafter for so long as Mr. Gilbert and his
permitted transferees are the beneficial owners of not less than five
percent (5%) of the issued and outstanding shares of Common Stock, the
Company has agreed to use its best efforts to elect, thereafter nominate
for election by the stockholders, cause the election of and thereafter to
continue in office, Mr. Gilbert and one additional person designated by Mr.
Gilbert to serve on the Board of Directors of the Company.  If elected as a
director of the Company, Mr. Gilbert intends to participate in and
influence the formulation of the business plans and strategies of the
Company.

          The 700,000 Warrant is immediately exercisable for 700,000 shares
of Common Stock, and will expire on October 15, 1996 (subject to extension
to November 30, 1996 if Mr. Gilbert (or any of his permitted transferees)
agrees to increase the amount of loans made to the Company from $100,000 to
$200,000).  The exercise price per share is $1.

          The 200,000 Share Warrant is exercisable for up to 200,000 shares
of Common Stock.  The 200,000 Share Warrant is exercisable only as provided
in the following paragraph and only if the 700,000 Share Warrant is
exercised prior to the exercise of the 200,000 Share Warrant.  The warrant
purchase price is $1.25 from the date of original issuance to the close of
business on the first anniversary of such date, $1.50 from the next day
after such first anniversary to the close of business on the second
anniversary of the date of original issuance and $1.75 thereafter.
<PAGE>
<PAGE>


          If, during the term of the 200,000 Share Warrant, the Company
proposes to effect a financing through the issuance of any debt or equity
security (including, without limitation, through the issuance of any rights
or options to purchase any debt or equity security or any securities that
are exchangeable for or convertible into any debt or equity securities),
the Company will first notify the holder of the 200,000 Share Warrant in
writing of such intent, specifying the details thereof.  The holder then
will have a period of 30 days after such notice to provide such financing
through the full or partial exercise of the 200,000 Share Warrant (provided
that the holder must provide 100% of such financing up to the product of
the maximum number of shares that may then be purchased by the holder
thereunder and the warrant purchase price then in effect), during which 30-
day period the Company will not effect such financing with a third party.

          The Purchase Agreement provides that for the period commencing on
September 18, 1996 and ending on the fifth anniversary thereof, without the
prior approval of the Company's Board of Directors, Mr. Gilbert and his
permitted transferees (the "Gilbert Entities") will not:
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<PAGE>

               (i)   purchase any shares of Common Stock that would result
          in the Gilbert Entities' beneficial ownership exceeding the
          greater of 946,000 shares of Common Stock or 45% of the then
          outstanding shares of Common Stock;
      
               (ii)   commence or participate in any proxy solicitation
          involving shares of Common Stock;

               (iii)  join a partnership, limited partnership, limited
          liability company, syndicate, or other group, or otherwise act in
          concert with any other person, for the purpose of acquiring,
          holding, voting, or disposing of common shares, or otherwise
          become a "person" within the meaning of Section 13(d)(3) of the
          Securities Exchange Act of 1934 (in each case other than solely
          with any of the Gilbert Entities);

               (iv)  sell any Common Stock in excess of 10% of the then
          outstanding shares to any individual person or group of related
          persons; or

               (v)   fail to have their shares of Common Stock present for
          quorum purposes at any meeting of the Company's stockholders.

          The foregoing restrictions will terminate and be of no further
force or effect in the event:
<PAGE>
<PAGE>


               (i)   the Company breaches any of its representations and
          warranties or obligations to the Gilbert Entities set forth in
          any agreement between the Gilbert Entities and the Company;

               (ii)  the Secured Promissory Note is not paid in full in
          accordance with its terms or an Event of Default occurs
          thereunder;

               (iii)  the Company enters into any agreement with a third
          party with respect to or announces an intention to effect certain
          extraordinary transactions;

               (iv)   Data Probe, Inc. owns less than 250,000 shares of
          Common Stock;

                (v)   Mr. Bachana voluntarily retires or resigns as the
          President of the Company; or

               (vi)   any event described in clauses (b), (d) or (e) of the
          definition of "Event of Default" in the Secured Promissory Note
          shall have occurred.

          If Mr. Gilbert exercises the 700,000 Share Warrant, the Company
also has agreed to grant to Mr. Gilbert the right to maintain his (and his
permitted transferees') equity and voting interest in the Company in
accordance with the terms of Section 9 of the Purchase Agreement.

          Mr. Gilbert and the Company also have entered into a Registration
Rights Agreement, dated September 18, 1996, pursuant to which, among other
<PAGE>
<PAGE>


things, the Company has granted Mr. Gilbert and his permitted transferees
certain registration rights with respect to their shares of Common Stock. 
Mr. Gilbert and Data Probe, Inc. also have agreed to grant each other a
right of first refusal with respect to sales of Common Stock owned by each
of them, other than sales pursuant to Rule 144 promulgated under the
Securities Act of 1933, as amended.

          The foregoing is a summary of certain provisions of the Purchase
Agreement, the Warrants and the Registration Rights Agreement and is
qualified in its entirety by reference to such agreements and Warrants,
which are attached as Exhibits hereto.  Subject to the foregoing, Mr.
Gilbert may from time to time seek to acquire additional shares of Common
Stock subject to availability at prices deemed attractive, or dispose of
shares of Common Stock.

          Except as set forth above, Mr. Gilbert currently has no other
plans or intentions which could result in or relate to any of the
transactions described in subparagraphs (a) through (j) of Item 4 of
Schedule 13D.

Item 5.   Interest in Securities of the Issuer
          ------------------------------------

          (a)  Mr. Gilbert beneficially owns 746,000 shares of Common Stock
(including 16,000 shares held in Mr. Gilbert's IRA account and 700,000
shares which may be acquired upon the exercise of the 700,000 Share
Warrant), representing approximately 32.3% of the Company's outstanding
shares of Common Stock (based upon representations made by the Company in
the Purchase Agreement).
<PAGE>
<PAGE>


          (b)  Subject to the provisions of the Purchase Agreement
described in Item 4 above, Mr. Gilbert has sole power to vote or to direct
the vote and sole power to dispose or to direct the disposition of the
746,000 shares of Common Stock beneficially owned by him.

          (c)  Except for the transactions referred to in Item 4 and as set
forth in Schedule 1 attached hereto, Mr. Gilbert has not effected
transactions in the Common Stock of the Company during the past 60 days.

          (d)  Not applicable.

          (e)  Not applicable.

Item 6.   Contracts, Arrangements, Understandings or
          ------------------------------------------
          Relationships with Respect to Securities of the Issuer
          ------------------------------------------------------

          Except as noted in Item 4 above, Mr. Gilbert does not have any
contracts, arrangements, understandings or relationships with respect to
any securities of the Company.
<PAGE>
<PAGE>


Item 7.   Material to be Filed as Exhibits
          --------------------------------

          1.   Securities Purchase Agreement, dated as of September 18,
1996, between G.S. Beckwith Gilbert and Megadata Corporation.

          2.   Warrant, dated as of September 18, 1996, executed by
Megadata Corporation in favor of G.S. Beckwith Gilbert in respect of
700,000 shares of Common Stock.

          3.   Warrant, dated as of September 18, 1996, executed by
Megadata Corporation in favor of G.S. Beckwith Gilbert in respect of
200,000 shares of Common Stock.

          4.   Registration Rights Agreement, dated as of September 18,
1996, between G.S. Beckwith Gilbert and Megadata Corporation.

          5.   Secured Promissory Note, dated as of September 18, 1996,
made by Megadata Corporation in favor of G.S. Beckwith Gilbert.

<PAGE>
<PAGE>


                                 SIGNATURE
                                 ---------
          After reasonable inquiry and to the best knowledge and belief of
the undersigned, the undersigned certifies that the information set forth
in this statement is true, complete and correct.

Dated: September 30, 1996               /s/ G.S. BECKWITH GILBERT              
                                   ----------------------------------------
                                        G.S. Beckwith Gilbert



<PAGE>
<PAGE>


                                 Schedule 1
                                 ----------

                          Number of Shares         Price Per
   Transaction Date           Purchased              Share *   
   ----------------       ----------------         --------


        8/1/96**                6,000               $1.125

        8/2/96**               10,000               $1.250

        8/7/96                 12,500               $1.125

       8/14/96                 17,500               $1.125


____________________

Each of the foregoing purchasers were effected in open market transactions.

*    Excludes commissions.

**   Purchased in Mr. Gilbert's IRA account.
<PAGE>
<PAGE>


                          EXHIBITS INDEX


          Material to be Filed as Exhibits
          --------------------------------

          1.   Securities Purchase Agreement, dated as of September 18,
1996, between G.S. Beckwith Gilbert and Megadata Corporation.

          2.   Warrant, dated as of September 18, 1996, executed by
Megadata Corporation in favor of G.S. Beckwith Gilbert in respect of
700,000 shares of Common Stock.

          3.   Warrant, dated as of September 18, 1996, executed by
Megadata Corporation in favor of G.S. Beckwith Gilbert in respect of
200,000 shares of Common Stock.

          4.   Registration Rights Agreement, dated as of September 18,
1996, between G.S. Beckwith Gilbert and Megadata Corporation.

          5.   Secured Promissory Note, dated as of September 18, 1996,
made by Megadata Corporation in favor of G.S. Beckwith Gilbert.





NYFS01...:\06\45206\0006\139\SCH9266P.26A

<PAGE>
  

                                                                  EXHIBIT 1


                          SECURITIES PURCHASE AGREEMENT
                          -----------------------------

               AGREEMENT, dated as of September 18, 1996, by and between
     MEGADATA CORPORATION, a New York corporation ("Seller" or the
     "Company"), and G.S. BECKWITH GILBERT (Purchaser").

     PREMISES:
     --------

               Seller desires to issue and sell to Purchaser, and Purchaser
     desires to purchase, (1) a secured promissory note in the principal
     amount of $100,000 (the "Secured Promissory Note"), (2) a warrant to
     purchase 700,000 shares of common stock, par value $.01 per share, of
     Seller (the "Common Stock") for a term extending to October 15, 1996,
     subject to extension (the "700,000 Share Warrant") and (3) a warrant
     to purchase up to a total of 200,000 shares of Common Stock for a term
     of three years (the "200,000 Share Warrant").

               NOW, THEREFORE, in consideration of the premises and the
     mutual covenants hereinafter contained, the parties hereto, intending
     to be legally bound, hereby agree as follows:

               1.   Sale of Promissory Note and Warrants.
                    ------------------------------------

               (a)  Sale of Promissory Note.  On the date hereof, Seller is
                    -----------------------
     issuing, selling and delivering to Purchaser, and Purchaser is
     purchasing from Seller, the Secured Promissory Note.


<PAGE>
<PAGE>
     

               (b)  Issuance of Warrants.  On the date hereof, Seller is
                    --------------------

     issuing, selling and delivering to Purchaser, and Purchaser is
     purchasing from Seller, the 700,000 Share Warrant and the 200,000
     Share Warrant (collectively, the "Warrants") to purchase, in the
     aggregate, a total of 900,000 shares of Common Stock (the "Warrant
     Shares").

               2.   Purchase Price; Payment
                    -----------------------
               (a)  Purchase Price.  The aggregate purchase price for the
                    --------------
     Secured Promissory Note and Warrants shall be One Hundred Thousand
     Dollars ($100,000) (the "Purchase Price").

               (b)  Payment.  The Purchase Price shall be payable by
                    -------
     Purchaser to Seller by wire transfer in immediately available funds to
     an account designated by Seller.

               3.   Representations and Warranties of Seller.  Seller
                    ----------------------------------------
     hereby represents and warrants to Purchaser as follows and
     acknowledges that Purchaser is relying on such representations and
     warranties in connection with the transactions provided for herein:

               (a)  Organization and Good Standing, etc.  Seller is a
                    ------------------------------------
     corporation duly organized, validly existing and in good standing
     under the laws of the State of New York, and has all requisite
     corporate power and authority to conduct its business as it is now
     conducted, to own or lease all of the properties owned or leased by
     it, to enter into and perform this Agreement and the
<PAGE>
<PAGE>
     

     Registration Rights Agreement, of even date herewith, between Seller
     and Purchaser (the "Registration Rights Agreement") and to issue and
     sell the Secured Promissory Note, the Warrants and, upon exercise of
     the Warrants in accordance with their terms, the Warrant Shares, and
     to otherwise consummate the transactions provided for in this
     Agreement and the Warrants.  True and complete copies of the
     Certificate of Incorporation and By-Laws of Seller (together with all
     amendments thereto as of the date hereof) have been previously
     delivered to Purchaser.  Except as set forth in the Disclosure
     Schedule delivered by Seller to Purchaser simultaneously with the
     execution of this Agreement (the "Disclosure Schedule"), Seller is
     duly licensed or qualified and in good standing as a foreign
     corporation in all jurisdictions in which the ownership or lease of
     property by it or the conduct of its business makes such licensing or
     qualification necessary and where the failure to be so licensed or
     qualified would have a material and adverse effect on its business.

               (b)  Authorization; Execution; Binding Effect.  The
                    ----------------------------------------
     execution, delivery and performance of this Agreement and the
     Registration Rights Agreement and the issuance and sale of the Secured
     Promissory Note, the Warrants and, upon exercise of the Warrants in
     accordance with their terms, the Warrant Shares, and the consummation
     of the transactions provided for in this
<PAGE>
<PAGE>
     

     Agreement, the Registration Rights Agreement and the Warrants have
     been duly authorized by all necessary corporate action on the part of
     Seller (including, without limitation, for purposes of Section 912 of
     the New York Business Corporation Law) and this Agreement and the
     Registration Rights Agreement constitute and, upon the issuance and
     delivery of the Warrants, each of the Warrants will constitute, the
     legal, valid and binding obligation of Seller enforceable against
     Seller in accordance with its terms, except as enforceability may be
     limited by bankruptcy, insolvency, reorganization or other laws
     affecting creditors' rights and by general equity principles.

               (c)  Capitalization.  The authorized capital stock of Seller
                    ---------------
     consists of 5,000,000 shares of Common Stock, of which 1,611,600
     shares are issued and outstanding at the date hereof.  All of the
     outstanding shares of Seller are duly authorized, validly issued,
     fully paid and nonassessable.  Except for this Agreement and the
     Warrants, and options to purchase 55,000 shares of Common Stock held
     by employees pursuant to the Company's stock option plans, there is no
     existing option, warrant, call, commitment or other agreement to which
     Seller is a party requiring, and there are no convertible securities
     of Seller outstanding which upon conversion would require, the
     issuance of any additional shares of Common Stock or other securities

<PAGE>
<PAGE>
     

     convertible into shares of Common Stock or any other equity security
     of Seller.

               (d)  [Reserved]

               (e)  Valid Issuance of Warrant Shares. Upon the issuance of
                    --------------------------------
     the Warrant Shares in accordance with the terms of the Warrants, all
     of such shares will be duly authorized, validly issued, fully paid and
     nonassessable.

               (f)  Financial Statements.  Seller has delivered to
                    --------------------
     Purchaser copies of its consolidated financial statements and
     schedules for the three years ended October 31, 1995 certified by
     Ghassemi, Phoel & Company, independent certified public accountants. 
     In addition, Seller has delivered to Purchaser copies of its unaudited
     financial statements as at April 30, 1996 and for the six-months then
     ended.  Each of the foregoing financial statements is complete and
     correct in all material respects (subject to normal year-end
     adjustments in accordance with generally accepted accounting
     principles with respect to the interim financial statements), is in
     accordance with the books and records of Seller as of the dates and
     for the periods indicated, has been prepared in accordance with
     generally accepted accounting principles and in conformity with the
     practices consistently applied by Seller in the immediately preceding
     fiscal periods, and fairly presents the financial condition, results
     of operations and changes in financial
<PAGE>
<PAGE>
     

     position of Seller as at the dates and for the periods indicated.  For
     the purposes hereof, the Consolidated Balance Sheet of Seller as at
     April 30, 1996 is referred to as the "Balance Sheet" and April 30,
     1996 is referred to as the "Balance Sheet Date".

               (g)  No Undisclosed Liabilities.  Except as set forth in the
                    --------------------------
     Disclosure Schedule, as at the Balance Sheet Date, Seller did not have
     any material obligation, indebtedness or liability of any nature
     (whether accrued, absolute, contingent or otherwise, and whether due
     or to become due) which is not shown on the Balance Sheet or the notes
     thereto or disclosed herein or in any document delivered to the
     Purchaser hereunder upon the execution and delivery hereof.  Except as
     set forth in the Balance Sheet, Seller does not have outstanding any
     material obligation, indebtedness or liability, nor knows of any basis
     for the assertion against Seller of any such obligation, indebtedness
     or liability, of any kind, whether accrued, absolute, contingent or
     otherwise, other than as disclosed herein or in a document referred to
     herein.
<PAGE>

               (h)  No Conflicting Agreements or Charter Provisions.  The
                    -----------------------------------------------
      execution, delivery and compliance with and performance of the terms
     and provisions of this Agreement, the Registration Rights Agreement
     and the Warrants, and the issuance of the Secured Promissory Note, the
     Warrants and, upon exercise of the Warrants in accordance with their
     terms, the Warrant Shares will not conflict with or result in a 
     breach of the terms, conditions or provisions of, or constitute a 
     default under, or result in any violation of, (i) the Certificate 
     of Incorporation or By-Laws of Seller or any resolutions adopted by the
     shareholders or the Board of Directors of Seller, (ii) any provision of
     any material contract or other material instrument to which Seller is a
     party or by which it or any material part of its assets may be bound 
     or (iii) any order, judgment, decree, statute, law, rule or regulation 
     to which Seller is subject or by which any material part of its assets 
     may be bound.  The execution and delivery of this Agreement, the 
     Registration Rights Agreement and the Warrants, the issuance of the 
     Secured Promissory Note and the Warrants in accordance with the terms 
     hereof and the issuance of the Warrant Shares in accordance with the 
     terms of the Warrants will not result in the creation of any lien, 
     charge or encumbrance upon the business or any material part of the 
     assets or properties of Seller.
 <PAGE>
<PAGE>


              (i)  Default.  Seller is not in default or alleged to be in
                    -------
     default with respect to any judgment, order, writ, injunction or
     decree of any court or any federal, state, municipal or other
     governmental authority, department, commission, board or agency or
     other entity where such default would have a material adverse effect
     on the financial condition, results of operations, prospects,
     business, properties, assets or liabilities of Seller.  Seller is not 
     in breach or default or alleged to be in breach or default under any 
     lease, license, contract, agreement, commitment, instrument or 
     obligation, and Seller does not know of any condition or state of facts 
     which is likely to cause or create a default or defaults under any such
     lease, license, contract, agreement, commitment, instrument or obligation
     where such default would have a material adverse effect on the financial
     condition, results of operations, prospects, business, properties, assets
     or liabilities of Seller.  Seller does not know of any other party to any
     lease, license, contract, agreement, commitment, instrument or
     obligation to which Seller is a party and which is material to
     Seller's business that is in default thereunder and, to the best of
     Seller's knowledge, there exists no condition or event which, after
     notice or lapse of time or both would constitute a default of any
     other party to any such lease, license, commitment, contract,
     agreement, instrument or obligation.
<PAGE>
<PAGE>


               (j)  Compliance with All Laws.  Seller (i) has complied in
                    ------------------------
     all material respects with all laws, regulations and orders which are
     applicable in any material respect to its business as presently
     conducted, (ii) possesses all material permits, licenses and other
     governmental approvals, authorizations and orders specifically
     applicable to, or necessary for the conduct of its business as
     presently conducted and (iii)  has obtained
     all governmental approvals and all other approvals, consents,
     certifications and waivers which are required on the part of Seller to
     enter into and perform this Agreement and to issue and sell to
     Purchaser the Secured Promissory Note and Warrants and, upon the
     exercise of the Warrants in accordance with their terms, the Warrant
     Shares, and to otherwise consummate the transactions provided for in
     this Agreement and the Warrants.

               (k)  No Adverse Changes.  Since the Balance Sheet Date and
                    ------------------
     except as disclosed in the Disclosure Schedule, there has not been,
     occurred or arisen (i) any material adverse change in the financial
<PAGE>
<PAGE>


     condition, results of operations, prospects, business, properties,
     assets or liabilities of Seller, (ii) any damage or destruction in the
     nature of a casualty loss, whether covered by insurance or not,
     adversely affecting any property of Seller material to the financial
     condition, results of operations, business, prospects, assets or
     liabilities of Seller, (iii) any termination of its contract with any
     major customer, (iv) any increase in the base compensation payable or
     to become payable by Seller to any of its directors, officers,
     management, personnel, consultants or agents whose aggregate
     remuneration on an annual basis now exceeds $50,000 or any increase in
     benefits under any bonus, insurance, pension or other benefit plan
     made for or with any of such persons, (v) to the Company's best
     knowledge, any actual or threatened strike or other labor trouble or
     dispute which materially and adversely affects, or might materially and
     adversely affect, the financial condition, results of operations,
     business, prospects, assets or liabilities of Seller, (vi) any direct
     or indirect redemption, purchase or other acquisition by Seller of any
     shares of capital stock of Seller, any declaration, setting aside or
     payment of any dividend or other distribution by Seller in respect of
     shares of capital stock of Seller whether in cash, stock or property,
<PAGE>
<PAGE>


     or any loan to any shareholder other than advances for expenses in the
     ordinary course of business to any shareholder in his capacity as an
     officer, director or employee of Seller, (vii) any extraordinary loss
     (as defined in Opinion No. 30 of the Accounting Principles Board of
     the American Institute of Certified Public Accountants and any
     amendments or interpretations thereof) suffered by Seller, which,
     individually or in the aggregate, is material to Seller, (viii) any
     waiver by Seller of any right or rights which, individually or in the
     aggregate, would have a material and adverse effect on the financial
     condition, results of operations, business, prospects, assets or
     liabilities of Seller, (ix) any mortgage on, pledge of or grant of a
     security interest in any of the assets of Seller, (x) any obligation
     incurred by Seller other than any incurred in the ordinary course of
     business and which, individually or in the aggregate with all other
     obligations so incurred, is or are not material in amount, or (xi) any
     other event, condition or state of facts of any character peculiar to 
     Seller or to its or their operations and not generally applicable to 
     private enterprises in the same business as Seller, which materially 
     adversely affects, or might reasonably be expected in the future to 
     affect materially and adversely, the financial condition, results 
 <PAGE>
<PAGE>



     of operations, business, prospects, assets or liabilities of Seller.

               (l)  Litigation.  Except as disclosed in the Disclosure
                    ----------
     Schedule, there is no action, suit, proceeding or investigation
     pending or, to Seller's knowledge, threatened, at law or in equity, in
     any court or before or by any federal, state, municipal or other
     governmental authority, department, commission, board, agency or other
     instrumentality (i) against or affecting Seller which would have a
     material adverse effect on Seller, (ii) against or affecting any
     officer or director of Seller in their capacity as such or (iii)
     affecting this Agreement or the Warrants or any action taken or to be
     taken or documents executed or to be executed pursuant to or in
     connection with the provisions of this Agreement or the Warrants.

               (m)  [Reserved]

               (n)  Disclosures.  None of the information concerning Seller
                    -----------
     or its business, condition (financial or otherwise), assets,
     properties, prospects, personnel, products, plans and policies
     contained herein, in any schedule hereto or in any document referred
     to herein or in any schedule hereto or otherwise furnished to the 
     Purchaser in writing (as the same may have been superseded or 
     supplemented by any such information subsequently
     delivered in writing to Purchaser on or prior to the date hereof)
<PAGE>
<PAGE>


     contains any untrue statement of a material fact or omits to state a
     material fact necessary to make the statements contained herein or
     therein taken as a whole, in light of the circumstances existing when
     made, misleading in any material respect.

               (o)  [Reserved]

               (p)  Taxes.  Seller has filed all tax returns and reports
                    -----
     which are required to be filed by it as of the date hereof under the
     laws of the United States (including those of any jurisdiction
     thereof) and those of any other jurisdiction in which it does business
     except to the extent that extensions of time to make such filings have
     been granted by the appropriate taxing authorities and those
     extensions have not expired.  Seller has paid all taxes due and
     payable, or has made or will have made necessary accruals for all
     current taxes due and payable, for all taxable years ending on or
     before the date hereof.

          4.   Representations and Warranties of Purchaser.
               -------------------------------------------

               Purchaser hereby represents and warrants to Seller that the
     Secured Promissory Note and the Warrants to be purchased by Purchaser
     hereunder are being purchased by him or members of his family, a
     family trust or an IRA retirement account for

<PAGE>
<PAGE>
     

     Purchaser's benefit or the person referred to in Section 5 designated
     by Purchaser to serve and who serves on the Company's Board of
     Directors (collectively, a "permitted transferee") solely for his or
     their own account, for investment purposes only and not with a view to
     the distribution thereof (within the meaning of the Securities Act of
     1933, as amended (the "Securities Act)), and Purchaser and any such
     permitted transferee has such knowledge and experience in financial
     and business matters as to be capable of evaluating the merits and
     risks of his or their investment as contemplated hereby.  Purchaser
     hereby acknowledges that the Secured Promissory Note, the Warrants and
     the Warrant Shares have not been registered under the Securities Act
     or any other securities law and may not be sold in the United States
     except pursuant to a registration statement effective under the
     Securities Act or pursuant to an exemption from registration under the
     Securities Act, and in compliance with all other applicable securities
     laws.  Purchaser is an "accredited investor" (as defined in the rules
     promulgated under the Securities Act) and each permitted transferee
     will be an accredited investor.  Purchaser's Schedule 13D relating to
     the transactions contemplated hereby will be consistent with this
     Section 4 and will reflect Purchaser's intent, as a director of the
     Company, to participate in and influence the formulation of the
     business plans and strategies of the Company.

<PAGE>
<PAGE>
     

          5.   Nomination of Purchaser's Board Designees.
               -----------------------------------------

               (a)  From and after the exercise of the 700,000 Share
     Warrant and continuing thereafter for so long as Purchaser and its
     permitted transferees are the beneficial owners of not less than five
     percent (5%) of the issued and outstanding shares of Common Stock,
     Seller shall use its best efforts to elect, thereafter nominate for
     election by the stockholders, cause the election of and thereafter to
     continue in office, Purchaser and one additional person designated by
     Purchaser to serve on the Board of Directors of the Company, which
     designation shall be made by Purchaser by written notice to Seller of
     three candidates, with Purchaser having the right to object to any two
     of such three candidates.  Simultaneously with the exercise of the
     700,000 Share Warrant, Purchaser will be elected as a director of
     Seller.

               (b)  In the event of the resignation, removal, incapacity or
     death of Purchaser or a director designated by Purchaser, the Board
     shall use its best efforts to elect, or nominate for election by the
     stockholders, and thereafter to continue in office, such substitute
     director as Purchaser or Purchaser's legal representative may
     designate by written notice to Seller in accordance with the
     procedures outlined in subsection (a).

<PAGE>
<PAGE>
     

               (c)  For the period commencing on the Closing Date and
     ending on the fifth anniversary thereof, Purchaser and his affiliates
     (as defined in the rules promulgated under the Securities Exchange Act
     of 1934, as amended) shall vote all of their shares of Common Stock
     for the election of directors and with respect to stockholder
     proposals pursuant to Rule 14a-8 under the Securities Exchange Act of
     1934, as amended, in accordance with the recommendation of the
     Company's Board of Directors.

          6.   Access.  For a period ending on the date that the Secured
               ------
     Promissory Note is paid in full, Seller shall provide Purchaser and
     its representatives at the Company's offices with full and complete
     access to the books, records and personnel of Seller and the
     accountants and legal counsel of Seller at their offices so that
     Purchaser and its representatives may undertake a due diligence review
     of Seller.  No such investigation shall affect the representations and
     warranties of Seller made herein.

          7.   Certain Agreements.  (a) For the period commencing on the
               ------------------
     Closing Date and ending on the fifth anniversary thereof, without the
     prior approval of the Company's Board of Directors, Purchaser and his
     permitted transferees (the "Gilbert Entities") will not:
<PAGE>
<PAGE>


                    (i)  purchase any shares of Common Stock  that would
               result in the Gilbert Entities' beneficial
               ownership exceeding the greater of 946,000 shares of Common
               Stock or 45% of the outstanding shares of Common Stock;

                    (ii)   commence or participate in any proxy
               solicitation involving shares of Common Stock;

                    (iii)  join a partnership, limited partnership, limited
               liability company, syndicate, or other group, or otherwise
               act in concert with any other person, for the purpose of
               acquiring, holding, voting, or disposing of common shares,
               or otherwise become a "person" within the meaning of Section
               13(d)(3) of the Securities Exchange Act of 1934 (in each
               case other than solely with any of the Gilbert Entities);

                    (iv)  sell any Common Stock in excess of 10% of the
               then outstanding shares to any individual person or group of
               related persons; or

                    (v)   fail to have their shares of Common Stock present
               for quorum purposes at any meeting of the Company's
               stockholders.

<PAGE>
<PAGE>



               (b)  The restrictions in subsection (a) shall terminate and
     be of no further force or effect in the event:

                         (i)  the Company breaches any of its
               representations and warranties or obligations to the
               Gilbert Entities set forth in any agreement between the
               Gilbert Entities and the Company;

                         (ii)  the Secured Promissory Note is not paid in
               full in accordance with its terms or an Event of Default
               occurs thereunder;

                         (iii) the Company enters into any agreement with a
               third party with respect to or announces an intention to
               effect an Extraordinary Transaction;

                          (iv) Data Probe, Inc. owns less than 250,000
               shares of Common Stock;

                          (v)  Mr. Bachana voluntarily retires or resigns
               as the President of the Company; or

                         (vi)  Any event described in clauses (b), (d) or
               (e) of the definition of "Event of Default" in the Secured
               Promissory Note shall have occurred.

          8.   Indemnification.
               ---------------

               (a)  Seller agrees to indemnify and hold Purchaser and his
     affiliates harmless from and against:
<PAGE>
<PAGE>


                         (i)  Any and all liabilities, obligations,
               damages, deficiencies and expenses resulting from any
               misrepresentation or breach of a representation or warranty
               or nonfulfillment of any covenant or agreement on the part
               of Seller under the terms of this Agreement.

                         (ii)  All actions, suits, proceedings, demands,
               assessments, judgments, costs and expenses, including
               reasonable attorneys' fees and disbursements, incident to
               the foregoing.

               (b)  In the event that any legal proceedings shall be
     instituted or that any claim or demand shall be asserted by any third
     party in respect of which payment may be sought by Purchaser or its
     affiliates under the provisions of this Section 8 (referred to in this
     Section 8 as the "Indemnitee"), the Indemnitee shall promptly cause
     written notice of the assertion of any claim of which it has knowledge
     which is covered by this indemnity to be forwarded to Seller (referred
     to in this Section 8 as the "Indemnitor").  Indemnitor shall have the
     right, at its option and at its own expense, to be represented by
     counsel of its choice who must be reasonably satisfactory to
     Indemnitee, and to defend against, negotiate, settle or otherwise deal
<PAGE>
<PAGE>


     with any proceeding, claim or demand which relates to any loss,
     liability, damage or deficiency resulting from a third party claim or
     demand indemnified against hereunder; provided, however, that no
                                           --------  -------
     settlement shall be made without the prior written consent of
     Indemnitee, which consent shall not be unreasonably withheld or
     delayed; and provided, further, that Indemnitee may participate in any
                  --------  -------
     such proceeding with counsel of its choice and at its own expense.  To
     the extent Indemnitor elects not to defend such
     proceeding, claim or demand and Indemnitee defends against, settles or
     otherwise deals with any such proceeding, claim or demand, which
     settlement may be made without the consent of Indemnitor, Indemnitee
     will act reasonably and in accordance with its good faith business
     judgment.  The parties hereto agree to cooperate fully with each other
     in connection with the defense, negotiation or settlement of any such
     legal proceeding, claim or demand.

               Upon any final judgment or award having been rendered by a
     court, arbitration board or administrative agency of competent
     jurisdiction and the expiration of the time in which the appeal
     therefrom, or a settlement having been consummated, or Indemnitee and
     Indemnitor having arrived at a mutually binding agreement with respect
     to each separate matter indemnified by Indemnitor, Indemnitor shall
     forthwith pay all of the sums so owing to Indemnitee by certified or
     bank cashier's check, in immediately available funds.
<PAGE>
<PAGE>


               9.   Maintenance of Purchaser's Interest.  If Purchaser
                    -----------------------------------
     exercises the 700,000 Share Warrant, the Company hereby grants to
     Purchaser the right to maintain his (and his permitted transferees')
     equity and voting interest in the Company as follows:

               (a)  Except with respect to employee stock options to
     acquire shares of Common Stock not in excess of 50,000 shares on
     an annual basis ("Allowable Employee Stock Options") and the shares of
     Common Stock issuable upon the exercise of the Warrants, not less than
     thirty (30) nor more than sixty (60) days prior to any issuance
     (whether or not for consideration) or sale of any shares of Common
     Stock or any security convertible into shares of Common Stock or any
     option, right, warrant or similar instrument to acquire shares of
     Common Stock or any security convertible into shares of Common Stock
     (hereinafter referred to as "Equity Securities"), the Company shall
     notify Purchaser thereof in writing, which notice shall specify the
     kind and amount of Equity Securities that the Company intends to issue
     or sell and contain a detailed description of the terms of the
     proposed issuance or sale (including the proposed issuance or sale
     price, if any), and shall offer to Purchaser the opportunity to
<PAGE>
<PAGE>


     acquire such number of such Equity Securities as shall allow Purchaser
     and his permitted transferees, immediately following the issuance or
     sale of all such Equity Securities, to be the beneficial owner, in the
     aggregate, of the Purchaser's Proportionate Share Interest (as
     hereinafter defined).  For the purposes hereof, the "Purchaser's
     Proportionate Share Interest" shall mean such number of shares of
     Common Stock as shall constitute the percentage of all outstanding
     shares of Common Stock beneficially owned by Purchaser and his
     permitted transferees immediately prior to the issuance or sale
     referred to in the immediately preceding sentence.  For the purpose of 
     computing the Purchaser's Proportionate Share Interest, the following 
     shall be assumed:  (i) the complete conversion of any convertible 
     securities of the Company and (ii) the exercise and/or purchase of all 
     shares of Common Stock purchasable pursuant to all options, rights, 
     warrants or similar instruments relating to shares of Common Stock 
     (including those held by Purchaser).  The per share or equivalent price,
     if any, payable by Purchaser, and all other terms and conditions of the 
     offer to Purchaser, shall be identical to that offered to the other 
     parties in connection with such issuance or sale; provided, however, that
                                                       --------  -------
    if the purchase price is to be paid by other parties in kind or is for
<PAGE>
<PAGE>


     any other reason of a type of consideration which Purchaser cannot
     readily deliver, Purchaser shall nevertheless be entitled to pay the
     purchase price in cash, such price to be an amount equal to the
     monetary equivalent value to the Company of such consideration in kind
     or other consideration which Purchaser cannot readily deliver, as
     determined in good faith by Purchaser and the Company.  Purchaser
     shall have a period of sixty (60) days following the Company's notice
     to Purchaser pursuant to this Section 9 within which it may elect to
     purchase the Equity Securities offered to him pursuant to this Section
     9.  Such election may be for all or part of the Equity Securities
     offered to Purchaser, may be conditioned
     on Purchaser and the Company obtaining any requisite governmental
     approvals, consents or certifications (which Purchaser and the Company
     shall each covenant to use its best efforts to obtain as promptly as
     is practicable) and shall be made by written notice to the Company
     within such sixty (60) day period.  The closing of the purchase by the
     Purchaser of any Equity Securities pursuant to this Section 9 shall
     occur (A) at the time and location of the closing of the issuance or
     sale of Equity Securities which gave rise to Purchaser's rights under
     this Section 9 or (B) at such later time and at such location as may
     be specified in Purchaser's written notice of election, which shall be
<PAGE>
<PAGE>


     no less than five (5) nor more than thirty (30) days after the date of
     such notice; provided, however, that such thirty (30) day period shall
                  --------  -------
     be extended by the period of time necessary for Purchaser or the
     Company to obtain any requisite governmental approvals, consents,
     certifications or waivers.

               (b)  Notwithstanding anything to the contrary contained in
     Section 9 hereof, in the event that the Company shall issue or sell,
     in the aggregate, less than the number of Equity Securities referred
     to in the Company's notice to Purchaser pursuant to Section 9 hereof,
     the number of Equity Securities to be purchased from the Company at
     the closing referred to therein shall be proportionately reduced.

               (c)  If Purchaser shall not elect to purchase all of the
     Equity Securities offered to him pursuant to Section 9 hereof, then
     the Company shall, during a period of one hundred twenty (120) days
     following Purchaser's notice to the Company pursuant to this Section
     9, have the right to sell the number of Equity Securities that
     Purchaser has not elected to purchase pursuant to this Section 9 free
     and clear of the restrictions of Section 9 hereof at a price and upon
     other terms and conditions no more favorable to a purchaser than were
     offered to Purchaser pursuant to this Section 9.  At the expiration of
     such one hundred twenty (120) day period, any issuance or sale of such
     Equity Securities shall again be subject to the rights granted to
     Purchaser pursuant to this Section 9.
<PAGE>
<PAGE>


               (d)  Inasmuch as the market for shares of Common Stock of
     the Company is limited and Warrants are being sold and purchased in
     part in consideration of the provisions contained in this Section 9,
     the parties hereto acknowledge and agree that irreparable damage would
     result if such provisions were not specifically enforced.  Therefore,
     the parties consent that the rights and obligations with respect to
     the maintenance of Purchaser's interest in accordance with this
     Section 9 shall be enforceable by Purchaser in any court of competent
     jurisdiction in New York by a decree of specific performance and
     consent that injunctive relief may be granted in conjunction
     therewith.  Such remedies shall be cumulative and not exclusive and shall
     be in addition to any other rights or remedies (including, without
     limitation, any action for damages) the Purchaser may have under this
     Agreement or otherwise.

               (e)  Any of Purchaser's rights under this Section 9 may be
     transferred to any permitted transferee.

               (f)  The provisions of this Section 9 shall be in addition
     to and shall not in any way impair or modify Purchaser's rights under
     the 200,000 Share Warrant.
<PAGE>
<PAGE>


               10.  Notices.  Any notices or other communications required
                    -------
     or permitted hereunder shall be sufficiently given if (i) in writing
     and personally delivered, (ii) sent by telex provided that "answer-
     back" confirmation is received by the sender, or (iii) sent by
     registered or certified mail, postage paid, return receipt requested,
     in any case addressed as set forth on the signature page hereof.

               11.  General.
                    -------

               (a)  Entire Agreement.  This Agreement contains the entire
                    ----------------
     understanding of the parties hereto with respect to the subject matter
     hereof and there are no restrictions, representations, warranties,
     covenants or undertakings of the parties hereto except those expressly
     set forth herein or in a document referred to herein delivered to the
     Purchasers hereunder upon the execution and delivery hereof.

               (b)  Survival.  The representations, warranties, covenants
                    --------
     and agreements of the parties contained herein shall survive the
     execution and delivery of this Agreement for a period of 18 months
     from and after the exercise or termination of the 700,000 Share
     Warrant, except with respect to claims under the federal securities
     laws, in respect of which the applicable statutes of limitation period
     shall apply.
<PAGE>
<PAGE>


               (c)  Further Assurances.  The parties hereto each agree to
                    ------------------
     execute such other instruments, documents or agreements as may be
     reasonably necessary or desirable for the implementation of this
     Agreement and the consummation of the transactions contemplated
     hereby.

               (d)  Amendment; Waiver.  This Agreement may be amended or
                    -----------------
     waived only by a written instrument signed by the party against whom
     enforcement thereof is sought.

               (e)  Binding Effect; Assignment.  This Agreement shall be
                    --------------------------
     binding upon and inure to the benefit of the parties hereto and their
     respective successors, legal representatives and assigns, and the
     rights of Purchaser hereunder may be assigned to any permitted
     transferee.

               (f)  Section Headings.  The section headings contained in
                    ----------------
     this Agreement are for reference purposes only and shall not affect in
     any way the meaning or interpretation of this Agreement.

               (g)  Governing Law.  This Agreement shall be governed by,
                    -------------
     and construed and enforced in accordance with, the laws of the State
     of New York, without giving effect to the provisions, policies or
     principles thereof respecting conflict or choice of laws.

               (h)  Severability.  If at any time subsequent to the date of
                    ------------
     this Agreement, any provision of this Agreement shall be held by any
     court of competent jurisdiction to be illegal, void or unenforceable,
     such provision shall be of no force or effect but the illegality or
     unenforceability of such provision shall have no effect upon or impair
     the enforceability of any other provision.
<PAGE>
<PAGE>


               (i)  Counterparts.  This Agreement may be executed in one or
                    ------------
     more counterparts, each of which shall be deemed an original but all
     of which taken together shall constitute but one and the same
     agreement.

               (j)  Expenses.  Seller shall pay the costs and expenses
                    --------
     incurred by Purchaser (including, without limitation, attorneys' fees
     and expenses) in connection with the transactions contemplated by this
     Agreement.

<PAGE>
<PAGE>
     

               IN WITNESS WHEREOF, the parties hereto have executed this
     Agreement as of the day and year first above written.


     35 Orville Drive
     Bohemia, New York 11716


                                   MEGADATA CORPORATION


                                   By:                                     
                                      -------------------------------------
                                        Name:
                                        Title:



     104 Field Point Road
     Greenwich, Connecticut 06830


                                      ___________________________
                                        G.S. Beckwith Gilbert





     NYFS10...:\06\45206\0006\139\AGR8196M.25D

<PAGE>
                                                              EXHIBIT 2
                                                              

                                                              WARRANT NO. 1

                                                                  

               THIS WARRANT AND THE COMMON STOCK OR OTHER SECURITY
          ISSUABLE THEREFOR HAVE NOT BEEN REGISTERED UNDER THE U.S.
          SECURITIES ACT OF 1933, AS AMENDED, OR ANY OTHER APPLICABLE
          REGULATION OR LAW.  ACCORDINGLY, NO TRANSFER OF THIS WARRANT
          OR ANY SHARE ISSUABLE OR ISSUED UPON EXERCISE HEREOF MAY BE
          MADE IN THE UNITED STATES EXCEPT PURSUANT TO AN EFFECTIVE
          REGISTRATION STATEMENT UNDER SUCH ACT OR AN EXEMPTION FROM
          REGISTRATION THEREUNDER AND IN COMPLIANCE WITH ANY OTHER
          APPLICABLE SECURITIES LAWS AND THE TERMS HEREOF.

<PAGE>
<PAGE>
     

               To Subscribe for and Purchase Shares of Common Stock of
                              MEGADATA CORPORATION

     No. 1

               THIS CERTIFIES that, for value received, G.S. Beckwith
     Gilbert (or permitted transferees) is entitled to subscribe for and
     purchase from Megadata Corporation, a New York corporation (herein
     referred to as the "Company"), at any time, from the date hereof to
     5:00 p.m. (New York City time) on October 15, 1996 (subject to
     extension to November 30, 1996 if the holder hereof (or any of his
     permitted transferees) agrees to increase the amount of loans made to
     the Company from $100,000 to $200,000) (the "Expiration Time"),
     700,000 duly authorized, validly issued, fully paid and non-assessable
     shares of Common Stock ("Common Shares"), par value $.01 per share, of
     the Company, or any shares into which such Common Shares shall have
     been changed or any stock or other securities resulting from a
     reclassification thereof or change thereto (all such shares, stock or
     other securities which may be purchased by this Warrant are herein
     referred to as the "Shares"), at a per share price of $1.00.

               The Company represents that all Shares to which the holder
     of this Warrant shall be entitled upon exercise thereof (i) are duly
     authorized by the Certificate of Incorporation of the Company, in
     accordance with the laws of the State of New York, (ii) have been duly
     authorized to be issued upon the exercise of this Warrant, (iii) will
     be, when issued in accordance with the terms of this Warrant, duly
     authorized,
<PAGE>
<PAGE>
     

     validly issued and fully paid and nonassessable and free and clear of
     all taxes, liens, fees, charges and preemptive rights (other than
     taxes, liens, fees, charges and rights of others claiming by, and
     through, the holder hereof) and (iv) will not at the time of such
     exercise be subject to any restrictions on transfer or sale except as
     provided by applicable laws and agreements with the Company.

               1.   Exercise of Warrant.  (a)  The rights represented by
                    -------------------
     this Warrant may be exercised by the holder hereof, in whole and not
     in part, by the surrender of this Warrant, with the purchase form
     attached hereto (or reasonable facsimile thereof) duly executed, at
     the principal office of the Company at 35 Orville Drive, Bohemia, New
     York 11716 (or such other office or agency of the Company as it may
     designate by notice in writing to the holder hereof at the address of
     such holder appearing on the books of the Company at any time during
     the period within which the rights represented by this Warrant may be
     exercised) and upon payment as provided in Section 1(b) below.  The
     Company agrees that the Shares so purchased shall be and will be
     deemed to be issued to the holder hereof as the record owner of such
     Shares immediately prior to the close of business on the date on which
     this Warrant shall have been surrendered and payment made for such
     Shares as aforesaid.  Certificates for the Shares so purchased shall
     be delivered, at the Company's expense (including, without limitation,
     the payment by the Company of any applicable issue, stamp or other
     taxes), to the holder hereof as
<PAGE>
<PAGE>
     

     promptly as practicable thereafter, but in each case within five (5)
     days, after the rights represented by this Warrant shall have been
     exercised.  Certificates for fractional Shares will not be issued.

               (b)  Payment of the warrant purchase price for the Shares
     purchased upon the exercise of this Warrant shall be made in full (i)
     by wire transfer, cash, check, or money order, payable in United
     States currency to the order of Company, (ii) by delivering to the
     Company the Company's Secured Promissory Note dated the date hereof in
     the principal amount of $100,000 and delivered to the original holder
     hereof and any subsequent note issued by the Company to the holder
     hereof, such notes to be valued at 100% of their principal amount plus
     accrued and unpaid interest, or (iii) by any combination of the
     foregoing.

               2.   Transferability of Warrant.  This Warrant may be
                    --------------------------
     transferred, in whole or in part, by the original holder hereof to any
     member of his family, a family trust or an IRA retirement account for
     Purchaser's benefit or any person designated by the holder to serve
     and who serves on the Company's Board of Directors (a "permitted
     transferee").
<PAGE>
<PAGE>


               3.   Covenants of the Company.  The Company hereby covenants
                    ------------------------
     and agrees as follows:

               (a)  All Shares which may be issued upon the exercise of the
     rights represented by this Warrant will, upon issuance, (i) be validly
     issued, fully paid and nonassessable, (ii) be free from any and all
     taxes, liens, preemption and other rights of
     others, and charges with respect to the issue thereof (other than
     transfer taxes, if any, in respect of any transfer occurring
     contemporaneously with such issue) and (iii) not be, at the time of
     such exercise, subject to any restrictions on transfer or sale except
     as provided by applicable law and agreements with the Company.
   
            (b)  During the period within which the rights represented
     by this Warrant may be exercised, the Company will at all times have
     authorized and reserved a sufficient number of Shares to provide for
     the exercise of the rights represented by this Warrant.

               (c)  The Company will pay all stamp taxes attributable to
     the initial issuance of Shares issuable upon the exercise of this
     Warrant; provided, however, that the Company shall not be required to
              --------  -------
     pay any tax or taxes which may be payable in respect of any transfer
     involved in the issue or delivery of any certificates for Shares or
     other securities in a name other than that of the registered holder of
     this Warrant or a permitted transferee in respect of which such Shares
     or securities are issued.
<PAGE>
<PAGE>


               (d)  The Company will not, by way of amendment of its
     Certificate of Incorporation, through any consolidation, merger,
     reorganization, transfer of assets, distribution, issuance or sale of
     securities or any other voluntary action or omission avoid or seek to
     avoid the observance of any of the terms of this Warrant, but will at
     all times in good faith observe and perform
     all such terms and take all such action (or refrain from taking such
     action) as appropriate in order to protect the rights of the holder of
     this Warrant against dilution or other impairment.

               4.  [Reserved]

               5.   Warrant Purchase Price; Adjustments.  The price at
                    -----------------------------------
     which the Shares are to be purchased hereunder shall be appropriately
     adjusted to reflect any stock dividends, splits, combinations or
     reclassifications.  At no time during the term of this Warrant will
     the Company issue (or agree to issue) Shares at below the exercise
     price set forth herein.

               6.   No Fractional Shares.  Upon the exercise of this
                    --------------------
     Warrant, Company shall not be required to issue any fractional Shares
     or scrip certificates evidencing any fractional interest in Shares. 
     In any case where, pursuant to the terms of this Warrant, the holder
     hereof would be entitled, except for the provisions of this Section 6,
     to receive a fractional Share, the number of Shares issuable upon such
     exercise shall be rounded to the next larger whole Share.
<PAGE>
<PAGE>


               7.   Governing Law.  This Warrant shall be governed by and
                    -------------
     construed in accordance with the laws of the State of New York.

               8.   Mutilated or Missing Warrants.  Upon receipt of
                    -----------------------------
     evidence satisfactory to the Company of the loss, theft, destruction
     or mutilation of this Warrant and, in the case of any such loss, theft
     or destruction, upon delivery of a bond or indemnity satisfactory to
     the Company, or, in the case of any mutilation, upon surrender 
     or cancellation of this Warrant, the Company will issue 
     to the holder hereof a new warrant of like tenor, in lieu 
     of this Warrant, representing the right to subscribe for and
     purchase the number of Shares which may be subscribed for and
     purchased hereunder.

               IN WITNESS WHEREOF, Megadata Corporation has caused this
     Warrant to be signed by its duly authorized officer, and this Warrant
     to be dated, September 18, 1996.

                              MEGADATA CORPORATION



                              By:                                          
                                 ------------------------------------------



<PAGE>
<PAGE>
     

                                  PURCHASE FORM

     (To be signed only upon Exercise of this Warrant)

               The undersigned hereby exercises the within Warrant for the
     purchase of Shares (as defined in the Warrant) covered by such Warrant
     and in accordance with the terms and conditions thereof, and herewith
     makes payment of the exercise price in full.

               The Company is instructed to issue certificates for such
     Shares and any new Warrant to which the undersigned may be entitled on
     partial exercise hereof in the name of the undersigned and to deliver
     the same at the address indicated.
                                                            
                              ------------------------------
                              TYPE OF SHARES


                                                            
                              ------------------------------
                              NAME


                                                            
                              ------------------------------
                              STREET AND NUMBER


                                                            
                              ------------------------------
                              CITY AND STATE


                                                            
                              ------------------------------
                              PURCHASER'S SIGNATURE
                              Signature must conform exactly with
                              the name of the registered owner on
                              the front of this Warrant.

<PAGE>
<PAGE>
     

                                 ASSIGNMENT FORM

               FOR VALUE RECEIVED, the undersigned hereby sells, assigns
     and transfers unto _________________________ the rights represented by
     the foregoing Warrant of Megadata Corporation and appoints
     ______________ attorney to transfer said rights on the books of said
     corporation, with full power of substitution in the premises.


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


     Dated:

     In the presence of


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





     NYFS10...:\06\45206\0006\139\WAR8196K.26D

<PAGE>
                                                              EXHIBIT 3


                                                              WARRANT NO. 2

                                                               
               THIS WARRANT AND THE COMMON STOCK OR OTHER SECURITY
          ISSUABLE THEREFOR HAVE NOT BEEN REGISTERED UNDER THE U.S.
          SECURITIES ACT OF 1933, AS AMENDED, OR ANY OTHER APPLICABLE
          REGULATION OR LAW.  ACCORDINGLY, NO TRANSFER OF THIS WARRANT
          OR ANY SHARE ISSUABLE OR ISSUED UPON EXERCISE HEREOF MAY BE
          MADE IN THE UNITED STATES EXCEPT PURSUANT TO AN EFFECTIVE
          REGISTRATION STATEMENT UNDER SUCH ACT OR AN EXEMPTION FROM
          REGISTRATION THEREUNDER AND IN COMPLIANCE WITH ANY OTHER
          APPLICABLE SECURITIES LAWS AND THE TERMS HEREOF.

<PAGE>
<PAGE>
     

               To Subscribe for and Purchase Shares of Common Stock of

                              MEGADATA CORPORATION

     No. 2

               THIS CERTIFIES that, for value received, G.S. Beckwith
     Gilbert (or permitted transferees) is entitled to subscribe for and
     purchase from Megadata Corporation, a New York corporation (herein
     referred to as the "Company"), at any time and from time to time, from
     the date hereof to 5:00 p.m. (New York City time) on September 18,
     1999 (the "Expiration Time"), up to 200,000 duly authorized, validly
     issued, fully paid and non-assessable shares of Common Stock ("Common
     Shares"), par value $.01 per share, of the Company, or any shares into
     which such Common Shares shall have been changed or any stock or other
     securities resulting from a reclassification thereof or change thereto
     (all such shares, stock or other securities which may be purchased by
     this Warrant are herein referred to as the "Shares"), at the price and
     upon the terms and conditions and subject to adjustment, all as
     hereinafter set forth.  This Warrant is exercisable only as provided
     in Section 6 hereof and only if the warrant for 700,000 Shares issued
     by the Company to the holder on the date hereof (the "700,000 Share
     Warrant") is exercised prior to the exercise of this Warrant.

               The Company represents that all Shares to which the holder
     of this Warrant shall be entitled upon exercise thereof (i) are duly
     authorized by the Certificate of Incorporation of the Company, in
     accordance with the laws of the State of New
<PAGE>
<PAGE>
     

     York, (ii) have been duly authorized to be issued upon the exercise of
     this Warrant from time to time, in whole or in part, (iii) will be,
     when issued in accordance with the terms of this Warrant, duly
     authorized, validly issued and fully paid and nonassessable and free
     and clear of all taxes, liens, fees, charges and preemptive rights
     (other than taxes, liens, fees, charges and rights of others claiming
     by, and through, the holder hereof) and (iv) will not at the time of
     such exercise be subject to any restrictions on transfer or sale
     except as provided by applicable laws and agreements with the Company.

               1.   Exercise of Warrant.  (a)  The rights represented by
                    -------------------
     this Warrant may be exercised by the holder hereof, by the surrender
     of this Warrant, with the purchase form attached hereto (or reasonable
     facsimile thereof) duly executed, at the principal office of the
     Company at 35 Orville Drive, Bohemia, New York 11716 (or such other
     office or agency of the Company as it may designate by notice in
     writing to the holder hereof at the address of such holder appearing
     on the books of the Company at any time during the period within which
     the rights represented by this Warrant may be exercised) and upon
     payment as provided in Section 1(b) below.  The Company agrees that
     the Shares so purchased shall be and will be deemed to be issued to
     the holder hereof as the record owner of such Shares immediately prior
     to the close of business on the date on which this Warrant shall have
     been surrendered and payment made for such Shares as aforesaid. 
     Certificates for the Shares so purchased shall be
<PAGE>
<PAGE>
     

     delivered, at the Company's expense (including, without limitation,
     the payment by the Company of any applicable issue, stamp or other
     taxes), to the holder hereof as promptly as practicable thereafter,
     but in each case within five (5) days, after the rights represented by
     this Warrant shall have been exercised.

               (b)  Payment of the warrant purchase price for the Shares
     purchased upon the exercise of this Warrant shall be made in full by
     wire transfer, cash, check, or money order, payable in United States
     currency to the order of Company.

               (c)  The Company will, at the time of or at any time after
     each exercise of this Warrant, upon the request of the holder thereof
     or of any Shares issued upon any exercise, acknowledge in writing its
     continuing obligation to afford to such holder all rights to which
     such holder shall continue to be entitled under this Warrant; provided
     that, if any such holder shall fail to make any such request, the
     failure shall not affect the continuing obligation of the Company to
     afford such rights to such holder.

               2.   Transferability of Warrant.  This Warrant may be
                    --------------------------
     transferred, in whole or in part, by the original holder hereof to any
     member of his family, a family trust or an IRA retirement account for
     Purchaser's benefit or any person designated by the holder to serve
     and who serves on the Company's Board of Directors (a "permitted
     transferee").
<PAGE>
<PAGE>
     

               3.   Covenants of the Company.  The Company hereby covenants
                    ------------------------
     and agrees as follows:

               (a)  All Shares which may be issued upon the exercise of the
     rights represented by this Warrant will, upon issuance, (i) be validly
     issued, fully paid and nonassessable, (ii) be free from any and all
     taxes, liens, preemption and other rights of others, and charges with
     respect to the issue thereof (other than transfer taxes, if any, in
     respect of any transfer occurring contemporaneously with such issue)
     and (iii) not be, at the time of such exercise, subject to any
     restrictions on transfer or sale except as provided by applicable law
     and agreements with the Company.

               (b)  During the period within which the rights represented
     by this Warrant may be exercised, the Company will at all times have
     authorized and reserved a sufficient number of Shares to provide for
     the exercise of the rights represented by this Warrant.

               (c)  The Company will pay all stamp taxes attributable to
     the initial issuance of Shares issuable upon the exercise of this
     Warrant; provided, however, that the Company shall not be required to
              --------  -------
     pay any tax or taxes which may be payable in respect of any transfer
     involved in the issue or delivery of any certificates for Shares or
     other securities in a name other than that of the registered holder of
     this Warrant or a permitted transferee in respect of which such Shares
     or securities are issued.
<PAGE>
<PAGE>
     

               (d)  The Company will not, by way of amendment of its
     Certificate of Incorporation, through any consolidation, merger,
     reorganization, transfer of assets, distribution, issuance or sale of
     securities or any other voluntary action or omission avoid or seek to
     avoid the observance of any of the terms of this Warrant, but will at
     all times in good faith observe and perform all such terms and take
     all such action (or refrain from taking such action) as appropriate in
     order to protect the rights of the holder of this Warrant against
     dilution or other impairment.

               4.  Restrictions.  [Reserved].
                   ------------

               5.   Warrant Purchase Price.  The warrant purchase price
                    ----------------------
     shall be $1.25 from the date of original issuance of this Warrant to
     the close of business on the first anniversary of such date, $1.50
     from the next day after such first anniversary to the close of
     business on the second anniversary of the date of original issuance of
     this Warrant and $1.75 thereafter.  Such warrant purchase price shall
     be appropriately adjusted to reflect any stock dividends, splits,
     combinations or reclassifications.  At no time during the term of this
     Warrant will the Company issue (or agree to issue) Shares at below the
     warrant purchase price then in effect, except for Shares issued
     pursuant to the 700,000 Share Warrant and Shares issued pursuant to
     employee stock options in the ordinary course of business, but not in
     excess of 50,000 Shares on an annual basis.
<PAGE>
<PAGE>


               6.   Prior Notice of Any Financings.  If, during the term of
                    ------------------------------
     this Warrant, the Company shall propose to effect a
     financing through the issuance of any debt or equity security
     (including, without limitation, through the issuance of any rights or
     options to purchase any debt or equity security or any securities that
     are exchangeable for or convertible into any debt or equity
     securities), the Company shall first notify the holder of this Warrant
     in writing of such intent, specifying the details thereof.  The holder
     then shall have a period of 30 days after such notice to provide such
     financing through the full or partial exercise of this Warrant
     (provided that the holder must provide 100% of such financing up to
     the product of the maximum number of Shares that may then be purchased
     by the holder hereunder and the warrant purchase price then in
     effect), during which 30-day period the Company shall not effect such
     financing with a third party.

               7.   No Fractional Shares.  Upon the exercise of this
                    --------------------
     Warrant, whether in whole or in part, Company shall not be required to
     issue any fractional Shares or scrip certificates evidencing any
     fractional interest in Shares.  In any case where, pursuant to the
     terms of this Warrant, the holder hereof would be entitled, except for
     the provisions of this Section 7, to receive a fractional Share, the
     number of Shares issuable upon such exercise shall be rounded to the
     next larger whole Share.
<PAGE>
<PAGE>


               8.   Governing Law.  This Warrant shall be governed by and
                    -------------
     construed in accordance with the laws of the State of New York.

               9.   Mutilated or Missing Warrants.  Upon receipt of
                    -----------------------------
     evidence satisfactory to the Company of the loss, theft, destruction
     or mutilation of this Warrant and, in the case of any such loss, theft
     or destruction, upon delivery of a bond or indemnity satisfactory to
     the Company, or, in the case of any mutilation, upon surrender or
     cancellation of this Warrant, the Company will issue to the holder
     hereof a new warrant of like tenor, in lieu of this Warrant,
     representing the right to subscribe for and purchase the number of
     Shares which may be subscribed for and purchased hereunder.

               IN WITNESS WHEREOF, Megadata Corporation has caused this
     Warrant to be signed by its duly authorized officer, and this Warrant
     to be dated, September 18, 1996.

                              MEGADATA CORPORATION



                              By:                                          
                                 ------------------------------------------

<PAGE>
<PAGE>
     



                                  PURCHASE FORM

     (To be signed only upon Exercise of this Warrant)

               The undersigned hereby exercises the within Warrant for the
     purchase of Shares (as defined in the Warrant) covered by such Warrant
     and in accordance with the terms and conditions thereof, and herewith
     makes payment of the exercise price in full.

               The Company is instructed to issue certificates for such
     Shares and any new Warrant to which the undersigned may be entitled on
     partial exercise hereof in the name of the undersigned and to deliver
     the same at the address indicated.
                                                            
                              ------------------------------
                              TYPE OF SHARES


                                                            
                              ------------------------------
                              NAME


                                                            
                              ------------------------------
                              STREET AND NUMBER


                                                            
                              ------------------------------
                              CITY AND STATE


                                                            
                              ------------------------------
                              PURCHASER'S SIGNATURE
                              Signature must conform exactly with
                              the name of the registered owner on
                              the front of this Warrant.


<PAGE>
<PAGE>
     

                                 ASSIGNMENT FORM

               FOR VALUE RECEIVED, the undersigned hereby sells, assigns
     and transfers unto _________________________ the rights represented by
     the foregoing Warrant of Megadata Corporation and appoints
     ______________ attorney to transfer said rights on the books of said
     corporation, with full power of substitution in the premises.


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


     Dated:

     In the presence of


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







     NYFS10...:\06\45206\0006\139\WAR8196P.41C

<PAGE>

                                                                  EXHIBIT 4


                          REGISTRATION RIGHTS AGREEMENT
                          -----------------------------

               Registration Rights Agreement, dated as of September 18,
     1996, between Megadata Corporation, a New York corporation
     ("Company"), and G.S. Beckwith Gilbert ("Purchaser").

                              W I T N E S S E T H :
                              -------------------
               WHEREAS, Company and Purchaser have entered into a
     Securities Purchase Agreement, dated as of the date hereof
     ("Securities Purchase Agreement"), pursuant to which Company has
     agreed to issue and sell to Purchaser, and Purchaser has agreed to
     purchase from Company, the Warrants (as defined in the Securities
     Purchase Agreement); and

               WHEREAS, in order to induce Purchaser to enter into the
     Securities Purchase Agreement and to purchase such Warrants, Company
     has agreed to provide registration rights with respect thereto;

               NOW, THEREFORE, in consideration of the premises and the
     covenants hereinafter contained, it is agreed as follows:

               1.  Definitions.  The following terms shall have (unless
                   -----------
     otherwise provided elsewhere in this Registration Rights Agreement)
     the following respective meanings (such meanings being equally
     applicable to both the singular and plural form of the terms defined):

               "Agreement" shall mean this Registration Rights Agreement,
     including all amendments, modifications and supplements and any
     exhibits or schedules to any of the foregoing, and shall refer to the
     Agreement as the same may be in effect at the time such reference
     becomes operative.

               "Business Day" shall mean any day that is not a Saturday, a
     Sunday or a day on which banks are required or permitted to be closed
     in the State of New York.

               "Commission" shall mean the Securities and Exchange
     Commission or any other federal agency then administering the
     Securities Act and other federal securities laws.

<PAGE>
<PAGE>
     

               "Exchange Act" shall mean the Securities Exchange Act of
     1934, as amended, or any similar federal statute, and the rules and
     regulations of the Commission thereunder, all as the same shall be in
     effect from time to time.

               "NASD" shall mean the National Association of Securities
     Dealers, Inc., or any successor corporation thereto.

               "Person" shall mean any individual, corporation,
     partnership, association or other entity.

               "Registrable Securities" shall mean any and all securities
     of the Company issued pursuant to exercise of the Warrants.

               "Securities Act" shall mean the Securities Act of 1933, as
     amended, or any similar federal statute, and the rules and regulations
     of the Commission thereunder, all as the same shall be in effect from
     time to time.

               2. [Reserved]

               3.  Incidental Registration.  If Company at any time on or
                   -----------------------
     prior to September 18, 2006, proposes to file on its behalf and/or on
     behalf of any of its security holders ("the demanding security
     holders") a Registration Statement under the Securities Act on any
     form (other than a Registration Statement on Form S-4 or S-8 or any
     successor form for securities to be offered in a transaction of the
     type referred to in Rule 145 under the Securities Act or to employees
     of Company pursuant to any employee benefit plan, respectively) for
     the general registration of securities to be sold for cash with
     respect to its Common Stock or any other class of equity security (as
     defined in Section 3(a)(11) of the Exchange Act) of Company, it will
     give written notice to all holders of Registrable Securities at least
     30 days before the initial filing with the Commission of such
     Registration Statement, which notice shall set forth the intended
     method of disposition of the securities proposed to be registered by
     Company.  The notice shall offer to include in such filing the
     aggregate number of shares of Registrable Securities as such holders
     may request.

               Each holder of any such Registrable Securities desiring to
     have Registrable Securities registered under this Section 3 shall
     advise Company in writing within 30 days after the date of receipt of
     such offer from Company, setting forth the amount of such Registrable
     Securities for which registration is requested.  Company shall
     thereupon include in such filing the number of
<PAGE>
<PAGE>
     

     shares of Registrable Securities for which registration is so
     requested, subject to the next sentence, and shall use its best
     efforts to effect registration under the Securities Act of such
     shares.  If the managing underwriter of a proposed public offering
     shall advise Company in writing that, in its opinion, the distribution
     of the Registrable Securities requested to be included in the
     registration concurrently with the securities being registered by
     Company or such demanding security holder would materially and
     adversely affect the distribution of such securities by Company or
     such demanding security holder, then all selling security holders
     shall reduce the amount of securities each intended to distribute
     through such offering on a pro rata basis.  Except as otherwise
     provided in Section 5 all expenses of such registration shall be borne
     by Company.

               4.  Registration Procedures.  If Company is required by the
                   -----------------------
     provisions of Section 3 to use its best efforts to effect the
     registration of any of its securities under the Securities Act,
     Company will, as expeditiously as possible:

                    (a)  prepare and file with the Commission a
     Registration Statement with respect to such securities and use its
     best efforts to cause such Registration Statement to become and remain
     effective for a period of time required in the managing underwriter's
     determination for the disposition of such securities by the holders
     thereof;

                    (b)  prepare and file with the Commission such
     amendments and supplements to such Registration Statement and the
     prospectus used in connection therewith as may be necessary to keep
     such Registration Statement effective and to comply with the
     provisions of the Securities Act with respect to the sale or other
     disposition of all securities covered by such Registration Statement
     until such time as all of such securities have been disposed of in a
     public offering;

                    (c)  furnish to such selling security holders such
     number of copies of a summary prospectus or other prospectus,
     including a preliminary prospectus, in conformity with the
     requirements of the Securities Act, and such other documents, as such
     selling security holders may reasonably request;
<PAGE>
<PAGE>


                    (d)  use its best efforts to register or qualify the
     securities covered by such Registration Statement under such other
     securities or blue sky laws of such jurisdictions within the United
     States and Puerto Rico as each holder of such securities shall request
     (provided, however, that Company shall not be obligated to qualify as
      --------  -------
     a foreign corporation to do business under the laws of any 
     jurisdiction in which it is not then qualified or to file
     any general consent to service or process), and do such other 
     reasonable acts and things as may be required of it to
     enable such holder to consummate the disposition in such jurisdiction
     of the securities covered by such Registration Statement;

                    (e)  [Reserved] 

                    (f)  [Reserved]

                    (g)  enter into customary agreements (including an
     underwriting agreement in customary form) and take such other actions
     as are reasonably required in order to expedite or facilitate the
     disposition of such Registrable Securities; and

                    (h)  otherwise use its best efforts to comply with all
     applicable rules and regulations of the Commission, and make available
     to its security holders, as soon as reasonably practicable, but not
     later than 18 months after the effective date of the Registration
     Statement, an earnings statement covering the period of at least 12
     months beginning with the first full month after the effective date of
     such Registration Statement, which earnings statements shall satisfy
     the provisions of Section 11(a) of the Securities Act.

               It shall be a condition precedent to the obligation of
     Company to take any action pursuant to this Agreement in respect of
     the securities which are to be registered at the request of any holder
     of Registrable Securities that such holder shall furnish to Company
     such information regarding the securities held by such holder and the
     intended method of disposition thereof as Company shall reasonably
     request and as shall be required in connection with the action taken
     by Company.
<PAGE>
<PAGE>


               5.  Expenses.  All expenses incurred in complying with this
                   --------
     Agreement, including, without limitation, all registration and filing
     fees (including all expenses incident to filing with the NASD),
     printing expenses, fees and disbursements of counsel for Company, the
     reasonable fees and expenses of counsel for the selling security
     holders (selected by those holding a majority of the shares being
     registered), expenses of any special audits incident to or required by
     any such registration and expenses of complying with the securities or
     blue sky laws of any jurisdictions pursuant to Section 4(d), shall be
     paid by Company, except that Company shall not be liable for any fees,
     discounts or commissions to any underwriter or any fees or
     disbursements of counsel for any underwriter in respect of the 
     securities sold by such holder of Registrable Securities.

               6.  Indemnification and Contribution.
                   --------------------------------

                    (a)  In the event of any registration of any
     Registrable Securities under the Securities Act pursuant to this
     Agreement, Company shall indemnify and hold harmless the holder of
     such Registrable Securities, such holder's directors and officers (if
     applicable), and each other Person (including each underwriter) who
     participated in the offering of such Registrable Securities and each
     other Person, if any, who controls such holder or such participating
     Person within the meaning of the Securities Act, against any losses,
     claims, damages or liabilities, joint or several, to which such holder
     or any such director or officer or participating Person or controlling
     Person may become subject under the Securities Act or any other
     statute or at common law, insofar as such losses, claims, damages or
     liabilities (or actions in respect thereof) arise out of or are based
     upon (i) any alleged untrue statement of any material fact contained,
     on the effective date thereof, in any Registration Statement under
     which such securities were registered under the Securities Act, any
     preliminary prospectus or final prospectus contained therein, or any
     amendment or supplement thereto, or (ii) any alleged omission to state
     therein a material fact required to be stated therein or necessary to
     make the statements therein not misleading, and shall reimburse such
     holder or such director, officer or participating Person or
     controlling Person for any legal or any other expenses reasonably
     incurred by such holder or such director, officer or participating
     Person or controlling Person in connection with investigating or
     defending any such loss, claim, damage, liability or action; provided,
                                                                  --------
      however, that Company shall not be liable in any such case to the
      -------
<PAGE>
<PAGE>


     extent that any such loss, claim, damage or liability arises out of or
     is based upon any alleged untrue statement or alleged omission made in
     such Registration Statement, preliminary prospectus, prospectus or
     amendment or supplement in reliance upon and in conformity with
     written information furnished to Company by such holder specifically
     for use therein or (in the case of any registration pursuant to
     Section 2) so furnished for such purposes by any underwriter.  Such
     indemnity shall remain in full force and effect regardless of any
     investigation made by or on behalf of such holder or such director,
     officer or participating Person or controlling Person, and shall
     survive the transfer of such securities by such holder.

                    (b)  Each holder of any Registrable Securities, by
     acceptance thereof, agrees to indemnify and hold harmless
     Company, its directors and officers and each other Person, if any, who
     controls Company within the meaning of the Securities Act against any
     losses, claims, damages or liabilities, joint or several, to which
     Company or any such director or officer or any such Person may become
     subject under the Securities Act or any other statute or at common
     law, insofar as such losses, claims, damages or liabilities (or
     actions in respect thereof) arise out of or are based upon information
     in writing provided to Company by such holder of such Registrable
     Securities specifically for use in the following documents and
     contained, on the effective date thereof, in any Registration
     Statement under which securities were registered under the Securities
     Act at the request of such holder, any preliminary prospectus or final
     prospectus contained therein, or any amendment or supplement thereto.

                    (c)  If the indemnification provided for in this
     Section 6 from the indemnifying party is unavailable to an indemnified
     party hereunder in respect of any losses, claims, damages, liabilities
     or expenses referred to therein, then the indemnifying party, in lieu
     of indemnifying such indemnified party, shall contribute to the amount
     paid or payable by such indemnified party as a result of such losses,
     claims, damages, liabilities or expenses in such proportion as is
     appropriate to reflect the relative fault of the indemnifying party
     and indemnified parties in connection with the actions which resulted
     in such losses, claims, damages, liabilities or expenses, as well as
     any other relevant equitable considerations.  The relative fault of
     such indemnifying party and indemnified parties shall be determined by
     reference to, among other things, whether any action in question,
<PAGE>
<PAGE>


     including any untrue or alleged untrue statement of a material fact or
     omission or alleged omission to state a material fact, has been made
     by, or relates to information supplied by, such indemnifying party or
     indemnified parties, and the parties' relative intent, knowledge,
     access to information and opportunity to correct or prevent such
     action.  The amount paid or payable by a party as a result of the
     losses, claims, damages, liabilities and expenses referred to above
     shall be deemed to include any legal or other fees or expenses
     reasonably incurred by such party in connection with any investigation
     or proceeding.

               The parties hereto agree that it would not be just and
     equitable if contribution pursuant to this Section 6(c) were
     determined by pro rata allocation or by any other method of allocation
     which does not take account of the equitable considerations referred
     to in the immediately preceding paragraph.  No Person guilty of
     fraudulent misrepresentation (within the meaning of Section 11(f) 
     of the Securities Act) shall be entitled to contribution from 
     any Person who was not guilty of such fraudulent misrepresentation.

               7.  Certain Limitations on Registration Rights. 
                   ------------------------------------------
     Notwithstanding the other provisions of this Agreement, Company shall
     not be obligated to register the Registrable Securities of any holder
     if, in the opinion of counsel to Company reasonably satisfactory to
     the holder and its counsel (or, if the holder has engaged an
     investment banking firm, to such investment banking firm and its
     counsel), the sale or other disposition of such holder's Registrable
     Securities, in the manner proposed by such holder (or by such
     investment banking firm), may be effected without registering such
     Registrable Securities under the Securities Act; and

               8.  [Reserved]

               9.  Miscellaneous.
                   -------------
                    (a)  No Inconsistent Agreements.  Company will not
                         --------------------------
     hereafter enter into any agreement with respect to its securities
     which is inconsistent with the rights granted to the holders of
     Registrable Securities in this Agreement.  Company has not previously
     entered into any agreement with respect to any of its securities
     granting any registration rights to any person.
<PAGE>
<PAGE>


                    (b)  Remedies.  Each holder of Registrable Securities,
                         --------
     in addition to being entitled to exercise all rights granted by law,
     including recovery of damages, will be entitled to specific
     performance of its rights under this Agreement.  Company agrees that
     monetary damages would not be adequate compensation for any loss
     incurred by reason of a breach by it of the provisions of this
     Agreement and hereby agrees to waive the defense in any action for
     specific performance that a remedy at law would be adequate.  In any
     action or proceeding brought to enforce any provision of this
     Agreement or where any provision hereof is validly asserted as a
     defense, the successful party shall be entitled to recover reasonable
     attorneys' fees in addition to any other available remedy.

                    (c)  Amendments and Waivers.  Except as otherwise
                         ----------------------
     provided herein, the provisions of this Agreement may not be amended,
     modified or supplemented, and waivers or consents to departure from
     the provisions hereof may not be given unless Company has obtained the
     written consent of holders of at least a majority of the Registrable
     Securities then outstanding.

                    (d)  Notice Generally.  Any notice, demand, request,
                         ----------------
     consent, approval, declaration, delivery or other communication
     hereunder to be made pursuant to the provisions of this Agreement
     shall be made in accordance with the Security Purchase Agreement.

                    (e)  Successors and Assigns.  This Agreement shall
                         ----------------------
     inure to the benefit of and be binding upon the successors of each of
     the parties hereto and any permitted transferee (as defined in the
     Securities Purchase Agreement).

                    (f)  Headings.  The headings in this Agreement are for
                         --------
     convenience of reference only and shall not limit or otherwise affect
     the meaning hereof.

                    (g)  Governing Law.  This Agreement shall be governed
                         -------------
     by the laws of the State of New York, without regard to the provisions
     thereof relating to conflict of laws.

                    (h)  Severability.  Wherever possible, each provision
                         ------------
     of this Agreement shall be interpreted in such manner as to be
     effective and valid under applicable law, but if any provision of this
     Agreement shall be prohibited by or invalid under applicable law, such
     provision shall be ineffective to the extent of such prohibition or
     invalidity, without invalidating the remainder of such provision or
     the remaining provisions of this Agreement.
<PAGE>
<PAGE>


                    (i)  Entire Agreement.  This Agreement, together with
                         ----------------
     the Securities Purchase Agreement, represents the complete agreement
     and understanding of the parties hereto in respect of the subject
     matter contained herein and therein.  This Agreement supersedes all
     prior agreements and understandings between the parties with respect
     to the subject matter hereof.

               IN WITNESS WHEREOF, Company and Purchaser have executed this
     Agreement as of the date first above written.


                              MEGADATA CORPORATION



                              By:_________________________________
                                 Name:
                                 Title:

                                                                  
                                 ---------------------------------
                                   G.S. Beckwith Gilbert



     NYFS10...:\06\45206\0006\139\REG8196N.21C

<PAGE>
     

                                                             EXHIBIT 5



                          SECURED PROMISSORY NOTE
                          -----------------------


     $100,000                                New York, New York
                                             September 18, 1996


               FOR VALUE RECEIVED, the undersigned, MEGADATA
     CORPORATION, a New York corporation (hereinafter referred to as
     "Borrower"), hereby unconditionally PROMISES TO PAY to the order
     of G.S. BECKWITH GILBERT ("Lender"), or his permitted assigns, to
     an account designated by Lender, in lawful money of the United
     States of America and in immediately available funds, the
     principal amount of ONE HUNDRED THOUSAND DOLLARS ($100,000),
     together with interest on the unpaid principal amount of this
     Note outstanding from time to time from the date hereof, at an
     annual rate of 9% calculated on the basis of a 360-day year.

               If the warrant to purchase 700,000 shares of common
     stock of Borrower issued to Lender on the date hereof expires
     unexercised, the principal amount of the indebtedness evidenced
     hereby together with all accrued interest shall be payable on or
     prior to March 18, 1997.  Notwithstanding the foregoing, the
     principal amount of the indebtedness evidenced hereby together
     with all accrued interest shall be immediately due and payable
     upon written notice to Borrower from Lender upon the happening of
     any of the following Events of Default:

               (a)  Any representation or warranty in the Securities
     Purchase Agreement, dated the date hereof, between Borrower and
     Lender shall be untrue or incorrect in any material respect;

               (b)  Any of the assets of Borrower shall be attached,
     seized, levied upon or subjected to a writ or distress warrant,
     or come within the possession of any receiver, trustee, custodian
     or assignee for the benefit of creditors of Borrower and shall
     remain unstayed or undismissed for thirty (30) consecutive days;
     or any person other than Borrower shall apply for the appointment
     of a receiver, trustee or custodian for any of the assets of
     Borrower and shall remain unstayed or undismissed for thirty (30)
     consecutive days; or Borrower shall have concealed, removed or
     permitted to be concealed or removed, any part of its property,
     with intent to hinder, delay or defraud its creditors or any of
     them or made or suffered a transfer of any of its property or the
<PAGE>
<PAGE>
     

     incurring of an obligation which may be fraudulent under any
     bankruptcy, fraudulent conveyance or other similar law;

               (c)  A case or proceeding shall have been commenced
     against Borrower in a court having competent jurisdiction seeking
     a decree or order in respect of Borrower (i) under title 11 of
     the United States Code, as now constituted or hereafter amended,
     or any other applicable federal, state or foreign bankruptcy or
     other similar law, (ii) appointing a custodian, receiver,
     liquidator, assignee, trustee or sequestrator (or similar
     official) of Borrower or of any substantial part of its 
     properties, or (iii) ordering the winding-up or liquidation of
     the affairs of Borrower and such case or proceeding shall remain
     undismissed or unstayed for thirty (30) consecutive days or such
     court shall enter a decree or order granting the relief sought in
     such case or proceeding;

               (d)  Borrower shall (i) file a petition seeking relief
     under title 11 of the United States Code, as now constituted or
     hereafter amended, or any other applicable federal, state or
     foreign bankruptcy or other similar law, (ii) consent to the
     institution of proceedings thereunder or to the filing of any
     such petition or to the appointment of or taking possession by a
     custodian, receiver, liquidator, assignee, trustee or
     sequestrator (or similar official) of Borrower or of any
     substantial part of its properties, (iii) fail generally to pay
     its debts as such debts become due, or (iv) take any corporate
     action in furtherance of any such action;

               (e)  Final judgment or judgments (after the expiration
     of all times to appeal therefrom) for the payment of money in
     excess of $100,000 in the aggregate shall be rendered against
     Borrower and the same shall not be vacated, stayed, bonded, paid
     or discharged for a period of thirty (30) days; or

               (f)  Any other event shall have occurred which would
     have a material adverse effect on Borrower or its assets or
     financial condition in Lender's reasonable judgment and Lender
     shall have given Borrower at least twenty (20) days notice
     thereof.

               As security for any and all liabilities of the Borrower
     to Lender, now existing or hereafter arising hereunder, or
     otherwise, Lender is hereby given a lien upon and a security
     interest in any and all moneys or other property (i.e., goods and
     merchandise, as well as any and all documents relative thereto;
     also, funds, securities, choses in action and any and all other
     forms of property whether real, personal or mixed, and any right,

<PAGE>
<PAGE>
     

     title or interest of the Borrower therein or thereto), and/or the
     proceeds thereof, including (without limitation of the foregoing)
     that in safekeeping or in which Borrower may have any interest,
     except for any real estate and equipment on which John Keller has
     been granted a first lien remaining in effect.  In the event of
     the happening of any one or more Events of Default, Lender shall
     have all of the rights and remedies provided to a secured party
     by the Uniform Commercial Code in effect in New York State at
     that time and, in addition thereto, the Borrower further agrees
     that (1) in the event that notice is necessary, written notice
     delivered to the Borrower at its principal executive offices
     three business days prior to the date of public sale of the
     property subject to the lien and security interest created herein
     or prior to the date after which private sale or any other
     disposition of said property will be made shall constitute
     reasonable notice, but notice given in any other reasonable
     manner or at any other reasonable time shall be sufficient, (2)
     in the event of sale or other disposition of such property,
     Lender may apply the proceeds of any such sale or disposition to
     the satisfaction of Lender's reasonable attorneys' fees, legal
     expenses and other costs and expenses incurred in connection with
     the retaking, holding, preparing for sale, and selling of the
     property, and (3) without precluding any other methods of sale,
     the sale of property shall have been made in a commercially
     reasonable manner if conducted in conformity with reasonable
     commercial practices of banks disposing of similar property, but
     in any event, Lender may sell at his option on such terms as he
     may choose without assuming any credit risk and without any
     obligation to advertise.

               If any payment on this Note becomes due and payable on
     a day other than a business day, the maturity thereof shall be
     extended to the next succeeding business day and interest thereon
     shall be payable at the then applicable rate during such
     extension.

               Demand, presentment, protest and notice of nonpayment
     and protest are hereby waived by Borrower.
<PAGE>
<PAGE>



               This Note has been executed, delivered and accepted in
     the State of New York and shall be interpreted, governed by, and
     construed in accordance with, the laws of the State of New York.


                                   MEGADATA CORPORATION


                                   By:__________________________
                                       Title:





     NYFS10...:\06\45206\0006\139\NTS8196L.09D


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