3COM CORP
SC 13G/A, 1997-03-10
COMPUTER COMMUNICATIONS EQUIPMENT
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                                UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549


                                 SCHEDULE 13G


                  UNDER THE SECURITIES EXCHANGE ACT OF 1934

                             (AMENDMENT NO. 1 )*


                                  3Com Corp.
- -------------------------------------------------------------------------------
                               (Name of Issuer)

               10.25%, 11/01/01, Convertible Subordinated Notes
- -------------------------------------------------------------------------------
                        (Title of Class of Securities)

                                    
                                  885535AA2
                             --------------------
                                (CUSIP Number)


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).





                               Page 1 of 4 pages
<PAGE>   2
CUSIP No. 885535AA2                       13G                  Page 2 of 4 Pages



- --------------------------------------------------------------------------------
 1    NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      AIM Management Group Inc., on behalf of itself and its wholly-owned
      subsidiaries, A I M Advisors, Inc. and A I M Capital Management, Inc.
      I.D. No. 74-1881407
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       
                                                             (a) /  /
                                                             (b) /  /

- --------------------------------------------------------------------------------
 3    SEC USE ONLY



- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION

      State of Delaware
- --------------------------------------------------------------------------------
                               5     SOLE VOTING POWER

          NUMBER OF                         -0-
                                            
           SHARES              -------------------------------------------------
                               6     SHARED VOTING POWER
        BENEFICIALLY           
                                            -0-
          OWNED BY                          
                               ------------------------------------------------
            EACH               7     SOLE DISPOSITIVE POWER
                    
          REPORTING                         -0-
                                            
           PERSON              ------------------------------------------------
                               8     SHARED DISPOSITIVE POWER                  
            WITH    
                                            -0-
                                            
- ------------------------------------------------------------------------------- 
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            -0-
        
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

            

- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

            -0-

- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

            HC

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



                     *SEE INSTRUCTION BEFORE FILLING OUT!


                              Page 2 of 4 pages

<PAGE>   3
                                  SCHEDULE 13G



Item 1(a)  NAME OF ISSUER:

           3Com Corp.
           
Item 1(b)  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

           5400 Bayfront Plaza
           P.O. Box 58145
           Santa Clara, CA  95052-8145
           
Item 2(a)  NAME OF PERSON FILING:

           A I M Management Group Inc.
           
Item 2(b)  ADDRESS OF PRINCIPAL BUSINESS OFFICE:

           11 Greenway Plaza, Suite 1919
           Houston, Texas  77046
           
Item 2(c)  CITIZENSHIP:

           State of Delaware
           
Item 2(d)  TITLE OF CLASS OF SECURITIES:

           10.25%, 11/01/01, Convertible Subordinated Notes
           
Item 2(e)  CUSIP NUMBER:

           885535AA2
           
Item 3     TYPE OF REPORTING PERSON:

           Parent Holding Company, in accordance with section 240.13d-1(b)
           (ii)(G)
           
Item 4(a)  AMOUNT BENEFICIALLY OWNED AS OF FEBRUARY 28, 1997:

           N/A
           
Item 4(b)  PERCENT OF CLASS:

           N/A
           
Item 4(c)  DEEMED VOTING POWER AND DISPOSITION POWER:

           (i)   sole power to vote or to direct the vote:                N/A
           (ii)  shared power to vote or to direct the vote:              N/A
           (iii) sole power to dispose or to direct the disposition of:   N/A
           (iv)  shared power to dispose or to direct the disposition of: N/A
                                                                         
Item 5     OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

           This statement is being filed to report the fact that as of
           February 28, 1997, the reporting person has ceased to be the
           beneficial owner of more than five percent of the class of 
           securities.
           
Item 6     OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:

           N/A





                               Page 3 of 4 pages
<PAGE>   4

Item 7     IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED 
           THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY:

           A I M Advisors, Inc. and A I M Capital Management, Inc., Investment
           Advisers registered under Section 203 of the Investment Advisers Act
           
Item 8     IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

           N/A
           
Item 9     NOTICE OF DISSOLUTION OF A GROUP:

           N/A
           
Item 10    CERTIFICATION: 

           By signing below I certify that, to the best of my knowledge and
           belief, the securities referred to above were acquired in the 
           ordinary course of business and were not acquired for the purpose
           of and do not have the effect of changing or influencing the 
           control of the issuer of such securities and were not acquired in
           connection with or as a participant in any transaction having such
           purposes or effect. 

           
           SIGNATURE: 

           After reasonable inquiry and to the best of my knowledge and belief,
           I certify that the information set forth in this statement is true,
           complete and correct.
           

           Date:  March 10, 1997                A I M Management Group Inc.
                                     
                                     
                                     
                                     
                                                /s/ CAROL F. RELIHAN
                                                Carol F. Relihan
                                                Vice President, Secretary and 
                                                General Counsel



** Please call Sharon Poessel at (713) 214-1126 with questions regarding this
   filing.





                               Page 4 of 4 pages


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