EXHIBIT 4
  
  
                     AMENDMENT TO RIGHTS AGREEMENT
  
  
           This AMENDMENT, dated as of February 3, 1998, is between
 Digital Equipment Corporation, a Massachusetts corporation (the
 "Company"), and First Chicago Trust Company of New York, as rights
 agent (the "Rights Agent"). 
  
                                RECITALS 
  
           A.   The Company and the Rights Agent are parties to a Rights
 Agreement dated as of December 11, 1989 (the "Rights Agreement").
  
           B.   Compaq Computer Corporation, a Delaware corporation
 ("Parent") and the Company have entered into an Agreement and Plan of
 Merger dated as of January 25, 1998, as it may be amended from time to
 time (the "Merger Agreement"), pursuant to which a newly formed and
 wholly-owned subsidiary of Parent will merge with and into the Company
 (the "Merger").  The Board of Directors of the Company has approved the
 Merger Agreement and the Merger.
  
           C.   Pursuant to Section 26 of the Rights Agreement, the
 Board of Directors of the Company has determined that an amendment to
 the Rights Agreement as set forth herein is necessary and desirable in
 connection with the Merger and the Company and the Rights Agent desire
 to evidence such amendment in writing.
  
           Accordingly, the parties agree as follows: 
  
           1.   AMENDMENT OF SECTION 1(u).  Section 1(u) of the Rights
 Agreement is hereby amended to add the following sentence at the end
 thereof:
  
           "Parent (as defined herein), Merger Subsidiary (as defined
           herein), and each of their respective existing or future
           Affiliates or Associates shall each be deemed to be an Exempt
           Person solely by virtue of and in connection with (i) the
           execution of the Merger Agreement (as defined herein), (ii)
           the acquisition of Common Stock or other capital stock of the
           Company pursuant to the Merger Agreement or the consummation
           of the Merger (as defined herein) or (iii) the consummation
           of the other transactions contemplated by the Merger
           Agreement." 
  
           2.   AMENDMENT OF SECTION 1(uu).  Section 1(uu) of the Rights
 Agreement is hereby amended to add the following proviso at the end
 thereof:
  
           "; provided, however, that no Triggering Event shall result
           solely by virtue of (i) the execution of the Merger
           Agreement, (ii) the acquisition of Common Stock or other
           capital stock of the Company pursuant to the Merger Agreement
           or the consummation of the Merger or (iii) the consummation
           of the other transactions contemplated by the Merger
           Agreement." 
  
           3.   AMENDMENT OF SECTION 1.  Section 1 of the Rights
 Agreement is hereby further amended to add the following subparagraphs
 at the end thereof:
  
                (vv)  "Merger" shall have the meaning set forth in the
           Merger Agreement. 
  
                (ww)  "Merger Agreement" shall have the meaning set
           forth in Section 34 hereof. 
  
                (xx)  "Merger Subsidiary" shall have the meaning set
           forth in Section 34 hereof. 
  
                (yy)  "Parent" shall have the meaning set forth in
           Section 34 hereof. 
  
           4.   AMENDMENT OF SECTION 3(a).  Section 3(a) of the Rights
 Agreement is hereby amended to add the following sentence at the end
 thereof:
  
           "Notwithstanding anything in this Rights Agreement to the
           contrary, a Distribution Date shall not be deemed to have
           occurred solely by virtue of (i) the execution of the Merger
           Agreement, (ii) the acquisition of Common Stock or other
           capital stock of the Company pursuant to the Merger Agreement
           or the consummation of the Merger or (iii) the consummation
           of the other transactions contemplated by the Merger
           Agreement." 
  
           5.   AMENDMENT OF SECTION 7(a).  Section 7(a) of the Rights
 Agreement is amended to add the following sentence at the end thereof:
  
           "Notwithstanding anything in this Rights Agreement to the
           contrary, none of (i) the execution of the Merger Agreement,
           (ii) the acquisition of Common Stock or other capital stock
           of the Company pursuant to the Merger Agreement or the
           consummation of the Merger or (iii) the consummation of the
           other transactions contemplated by the Merger Agreement shall
           be deemed to be events that cause the Rights to become
           exercisable pursuant to the provisions of this Section 7 or
           otherwise." 
  
           6.   AMENDMENT OF SECTION 11.  Section 11 of the Rights
 Agreement is amended to add the following sentence after the first
 sentence of said Section:
  
           "Notwithstanding anything in this Rights Agreement to the
           contrary, none of (i) the execution of the Merger Agreement,
           (ii) the acquisition of Common Stock or other capital stock
           of the Company pursuant to the Merger Agreement or the
           consummation of the Merger or (iii) the consummation of the
           other transactions contemplated in the Merger Agreement shall
           be deemed to be events of the type described in this Section
           11 or to cause the Rights to be adjusted or to become
           exercisable in accordance with this Section 11." 
  
           7.   AMENDMENT OF SECTION 13.  Section 13 of the Rights
 Agreement is amended to add a new paragraph (e) at the end thereof:
  
           "(e)  Notwithstanding anything in this Rights Agreement to
           the contrary, none of (i) the execution of the Merger
           Agreement, (ii) the acquisition of Common Stock or other
           capital stock of the Company pursuant to the Merger Agreement
           or the consummation of the Merger or (iii) the consummation
           of the other transactions contemplated in the Merger
           Agreement shall be deemed to be events of the type described
           in this Section 13 or to cause the Rights to be adjusted or
           to become exercisable in accordance with this Section 13." 
  
           8.   ADDITION OF SECTION 34.  The Rights Agreement is hereby
 modified, supplemented and amended to add the following new Section 34:
  
           "Section 34.  Merger With Merger Subsidiary. 
  
                The Company and Compaq Computer Corporation, a Delaware
           corporation ("Parent"), have entered into an Agreement and
           Plan of Merger, dated as of January 25, 1998 as it may be
           amended from time to time (the "Merger Agreement"), pursuant
           to which a newly formed and wholly-owned subsidiary of Parent
           ("Merger Subsidiary"), shall merge with and into the
           Company.  Notwithstanding anything in this Rights Agreement
           to the contrary, if the Merger Agreement shall be terminated
           for any reason, then (a) the last sentence of Section 1(u)
           hereof shall be deemed repealed and deleted without any
           further action on the part of the Company or the Rights Agent
           and (b) the proviso at the end of Section 1(uu) hereof shall
           be deemed repealed and deleted without any further action on
           the part of the Company or the Rights Agent." 
  
           9.   EFFECTIVENESS.  This Amendment shall be deemed effective
 as of the date first written above, as if executed on such date. 
 Except as amended hereby, the Rights Agreement shall remain in full
 force and effect and shall be otherwise unaffected hereby.
  
           10.  MISCELLANEOUS.  This Amendment shall be deemed to be a
 contract made under the laws of the Commonwealth of Massachusetts and
 for all purposes shall be governed by and construed in accordance with
 the laws of the Commonwealth of Massachusetts applicable to contracts
 to be made and performed entirely within the Commonwealth of
 Massachusetts without giving effect to the principles of conflict of
 laws thereof.  This Amendment may be executed in any number of
 counterparts, each of such counterparts shall for all purposes be
 deemed to be an original, and all such counterparts shall together
 constitute but one and the same instrument.  If any provision, covenant
 or restriction of this Agreement is held by a court of competent
 jurisdiction or other authority to be invalid, illegal or
 unenforceable, the remainder of the terms, provisions, covenants and
 restrictions of this Amendment shall remain in full force and effect
 and shall in no way be affected, impaired or invalidated.
  
           EXECUTED under seal as of the date first set forth above. 
  

 Attest:                                   DIGITAL EQUIPMENT CORPORATION
  
  
 /s/ Gail Mann                             By: /s/ Thomas C. Siekman
- ----------------------------------            ----------------------------
 Name:  Gail Mann                             Name:  Thomas C. Siekman
 Title: Vice President, Assistant             Title: Senior Vice President
        General Counsel, Secretary                   & General Counsel 
        and Clerk                                      
  
  
 Attest:                                   RIGHTS AGENT:  FIRST CHICAGO
                                           TRUST COMPANY OF NEW YORK 
  
  
 /s/ G. Carlo Clampaglia                   By: /s/ Charles D. Keryc
- ----------------------------------            ----------------------------
 Name: G. Carlo Clampaglia                     Name:  Charles D. Keryc 
 Title:  Asst. Vice President                  Title: Vice President