AMENDMENT TO INSTALLMENT
                             OR SINGLE PAYMENT NOTE

     This Amendment, dated as of the date specified below, is by and between the
borrower (the "Borrower") and the bank (the "Bank") identified below.

                                    RECITALS

     A.   The Borrower has executed an  Installment or Single Payment Note (the
          "Note"),  payable to the bank dated June 28,  1994,  and the Borrower
          (and  if  applicable,   certain  third  parties)  have  executed  the
          collateral documents identified on the Note and certain other related
          documents (collectively the "Loan Documents"), setting
          forth the terms and conditions  upon which the Borrower has obtained a
          term  loan  from  the  Bank  in  the  original   principal  amount  of
          $3,600,000.00 .

     B.   The Borrower has requested that the Bank permit certain modifications
          to the Note as described below.

     C.   The Bank has agreed to such modifications, but only upon the terms
          and conditions outlined in this Amendment.

                                    AGREEMENT

In consideration of the mutual covenants  contained  herein,  and for other good
and valuable consideration, the Borrower and the Bank agree as follows:

     1.X Change in Interest  Rate. If checked here,  effective  upon the date of
this  Amendment,  the  information  under the heading  "Interest" is deleted and
replaced with the following:

     The Interest Rate will remain 6.90% from July 1, 1997 to June 30, 1998. The
     Interest  Rate for the  remainder  of the loan term will be  determined  by
     Borrower and Bank prior to June 30, 1998.

     2. __ Change in Payment Schedule.  If checked here, effective upon the date
of this  Amendment,  the  information  under the heading  "Payment  Schedule" is

deleted and replaced with the following:

     3. Effectiveness of Prior Documents. Except as specifically amended hereby,
the Note and the other Loan  Documents  shall remain in full force and effect in
accordance  with their  respective  terms.  All warranties  and  representations
contained  in the Note and the  other  Loan  Documents  are  hereby  reconfirmed
warranties  and  representations  contained  in the  Note  and  the  other  Loan
Documents  are  hereby  reconfirmed  as  of  the  date  hereof.  All  collateral
previously provided to secure the Note continues as security, and all guaranties
guaranteeing the Note remain in full force and effect. This is an amendment, not
a novation.

     4.  Preconditions  to  Effectiveness.  This  Amendment  shall  only  become
effective  upon  execution  by the  Borrower  and the Bank,  and approval by all
guarantors (if any) and any other third party required by the Bank.

     5. No Waiver of Defaults; Warranties. This Amendment shall not be construed
as or be deemed to be a waiver by the Bank of existing defaults by the Borrower,
whether known or undiscovered.  All agreements,  representations  and warranties
made herein shall survive the execution of this Amendment.

     6.   Counterparts.   This   Amendment  may  be  signed  in  any  number  of
counterparts,  each of which shall be  considered  an  original,  but when taken

together shall constitute one document.

     7.  Authorization.  The Borrower and all  guarantors (if any) represent and
warrant that the execution,  delivery and  performance of this Amendment and the
documents  referenced herein are within the corporate or partnership  powers (as
applicable)  of the Borrower and all corporate or  partnership  guarantors,  and
have been duly authorized by all necessary corporate or partnership action.

Dated as of:  May 23, 1997

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

(Individual Borrower)

                                         Heurikon Corporation

                                         Borrower Name (Organization)

___________________ (SEAL)               a Wisconsin Corporation

Borrower Name  ___________________       By:  Richard J. Thompson

                                              -------------------
___________________ (SEAL)               Name and Title: Richard J. Thompson
                                                         Vice President -Finance

                                         Firstar Bank Wisconsin (Bank)
                                         F/K/A Firstar Bank Madison, N.A.

                                         By: Stephen J. Tramp

                                             ----------------
                                         Name and Title:  Stephen J.Tramp
                                                          Asst. Vice President

<PAGE>

                 (All Guarantors should complete the following)

                         Acknowledgment by Guarantor(s)

     The undersigned hereby acknowledge(s) and agree(s) to all of the foregoing,
and agree(s) that the guaranty or a guaranties dated June 28, 1994,  continue(s)
to guarantee the  obligations  of the Borrower to the Bank as amended hereby and
by any prior amendments.

                                        (Individual Guarantors)

Date:  _________________________        ____________________________  (SEAL)

                                        Printed Name  ________________________

Date:  _________________________        ____________________________ (SEAL)

                                        Printed Name  ________________________

Date:  _________________________        Computer Products, Inc.

                                        -----------------------
                                        (Name of Organization)

                                        a  Florida Corporation

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

                                        By: Richard J. Thompson

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

                                        Name and Title: Richard J. Thompson,

                                                        ----------------------
                                                        VP Finance, CFO