<PAGE>

                         FIRST AMENDMENT TO
                     CREDIT AND SECURITY AGREEMENT

     This First Amendment, dated as of November 5, 1996, is made by and 
between MacUSA, Inc., a Minnesota corporation (the "Borrower"), and Norwest 
Bank Minnesota, National Association, a national banking association (the 
"Lender").

                               Recitals

     The Borrower and the Lender have entered into a Credit and Security 
Agreement dated as of January 3, 1996 (the "Credit Agreement"). Capitalized 
terms used in these recitals have the meanings given to them in the Credit 
Agreement unless otherwise specified.

     The loan advances under the Credit Agreement are evidenced by the 
Borrower's Revolving Note dated as of January 3, 1996, in the maximum 
principal amount of $4,000,000 and payable to the order of the Lender (the 
"Revolving Note").

     The Borrower has requested that certain amendments be made to the Credit 
Agreement. The Lender is willing to grant the Borrower's request subject to 
the terms and conditions set forth herein.

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

     1.   DEFINED TERMS. Capitalized terms used in this First Amendment which 
are defined in the Credit Agreement shall have the same meanings as defined 
therein, unless otherwise defined herein. In addition, Section 1.1 of the 
Credit Agreement is amended by adding or amending, as the case may be, the 
following definitions: 

     "'Borrowing Base' means, at any time and subject to change from time to 
  time in the Lender's sole discretion, the lesser of:

     (a)  the Maximum Line; or

     (b)  the sum of:

          (i)   75% of Eligible Accounts, PLUS

          (ii)  the lesser of (A) 20% of Eligible Inventory or (B) $500,000,
                PLUS

          (iii) the lesser of $600,000 or 50% of the market value of the CAM
                Stock."


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     "'First Amendment' means that certain First Amendment to Credit and 
  Security Agreement dated as of October  __, 1996."

     "'Floating Rate' means an annual rate equal to the sum of the Base Rate
  plus two percent (2.0%), which annual rate shall change when and as the Base
  Rate changes."

     2.   MINIMUM INTEREST CHARGE. Section 2.3 of the Credit Agreement is 
hereby amended by adding the following new subsection (e): 

     "(e) MINIMUM INTEREST CHARGE. Notwithstanding the interest payable 
  pursuant to Section 2.3(a), the Borrower shall pay to the Lender interest of 
  not less than $10,000 per calendar quarter (the "Minimum Interest Charge") 
  during the term of this Agreement, and the Borrower shall pay any deficiency 
  between the Minimum Interest Charge and the amount of interest otherwise 
  calculated under Section 2.3(a) on the last day of each calendar quarter and 
  the Termination Date or earlier prepayment by the Borrower or demand for 
  payment by the Lender.

     3.  TERMINATION DATE. That part of Section 2.6 of the Credit Agreement 
which reads as follows:

  "Unless terminated by the Lender at any time or by the Borrower pursuant to 
  Section 2.7, the Credit Facility shall remain in effect until December 31, 
  1996. December 31, 1996 is herein referred to as the 'Termination Date'."

is hereby amended to read as follows:

  "Unless terminated by the Lender at any time or by the Borrower pursuant to
  Section 2.7, the Credit Facility shall remain in effect until April 30, 1997.
  April 30, 1997 is herein referred to as the 'Termination Date'."

     4.  COMPLIANCE CERTIFICATE.  Notwithstanding Sections 6.1(a), (b) and 
(d) of the Credit Agreement, the compliance certificate and certificate 
concerning projections, required to be provided by the Parent to the Lender, 
shall hereafter be signed by both the Parent and Borrower.

     5.  MINIMUM BOOK NET WORTH PLUS SUBORDINATED DEBT. Section 6.14 of the 
Credit Agreement is amended in its entirety and replaced with the following 
new Section 6.14: 

  "Section 6.14  MINIMUM BOOK NET WORTH PLUS SUBORDINATED DEBT.  The Borrower 
  shall cause the Parent to maintain, during each period described below, the 
  sum of its consolidated Book Net Worth plus the Subordinated Debt, determined 
  as at

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  the end of each month, at an amount not less than the amount set forth 
  opposite such period:

                 Month Ending                   Minimum Worth plus
                 ------------                        SubDebt
                                                ------------------
                 January 31, 1996                   $ 2,302,000
                 February 29, 1996                  $ 2,223,000
                  March 31, 1996                    $ 2,228,000
                  April 30, 1996                    $ 2,217,000
                  May 31, 1996                      $ 2,228,000
                  June 30, 1996                     $ 2,288,000
                  July 31, 1996                     $ 2,292,000
                August 31, 1996                     $ 2,300,000
               September 30, 1996                   $ 2,250,000
               October 31, 1996                     $ 2,250,000
               November 30, 1996                    $ 2,300,000
               December 31, 1996                    $ 2,300,000
               January 31, 1997                     $ 2,300,000
               February 28, 1997                    $ 2,300,000
                  March 31, 1997                    $ 2,300,000


     6.  MAXIMUM DEBT TO BOOK NET WORTH PLUS SUBORDINATED DEBT RATIO. Section 
6.15 of the Credit Agreement is amended in its entirety and replaced with the 
following new Section 6.15: 

     "Section 6.15  MAXIMUM DEBT TO BOOK NET WORTH PLUS SUBORDINATED DEBT RATIO.
  The Borrower shall cause the Parent to maintain the ratio of its consolidated
  Debt to the sum of its consolidated Book Net Worth plus the Subordinated Debt,
  determined as at the end of each month, at not more than 3.30 to 1.00."

     7.  MINIMUM NET INCOME. Section 6.16 of the Credit Agreement is amended in
  its entirety and replaced with the following new Section 6.16: 

     "Section 6.16  MINIMUM NET INCOME. The Borrower shall not permit the 
  Parent to allow its consolidated Net Income for each month-end set forth 
  below to be less than the amount indicated:

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                         Month Ending           Minimum Consolidated
                         ------------                Net Income
                                                --------------------

                        August 31, 1996              ($400,000)
                      September 30, 1996             ($450,000)
                       October 31, 1996              ($450,000)
                      November 30, 1996              ($400,000)
                      December 31, 1996              ($400,000)
                       January 31, 1997               ($10,000)
                      February 28, 1997                  $0
                       March 31, 1997                    $0


     8.  MINIMUM MONTHLY NET INCOME. A new section is added to the Credit 
Agreement immediately after Section 6.16 and shall read as follows: 

     "Section 6.17 MINIMUM MONTHLY NET INCOME. The Borrower shall not permit the
  Parent to allow consolidated net income for any given month, calculated in
  accordance with GAAP, to be less than ($75,000)."

     9.  DIVIDENDS. That part of Section 7.5 of the Credit Agreement which reads
as follows:

     "The Parent and Borrower will not declare or pay any dividends (other than
  dividends payable solely in stock of the Parent) . . ."

is hereby amended to read as follows:

     "During fiscal year 1996, the Borrower will not, nor will the Borrower 
permit the Parent to, declare or pay any dividends (other than dividends 
payable solely in stock of the Parent) . . ."

In addition, the following language is added at the end of Section 7.5:

     "During fiscal year 1997, the Borrower will not, nor will the Borrower 
  permit the Parent to, declare or pay any dividends in excess of Net Income."

    10.  CAPITAL EXPENDITURES. Section 7.10 of the Credit Agreement is 
amended in its entirety and replaced with the following new Section 7.10: 

    "Section 7.10  CAPITAL EXPENDITURES. The Borrower will not, nor will the 
  Borrower permit the Parent to, incur Capital Expenditures or contract to 
  incur Capital 

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  Expenditures of more than $300,000 in the aggregate during the 1996 fiscal 
  year, and $100,000 in the aggregate during the period from January 1, 1997 
  through April 30, 1997.  In addition, the Borrower will not, nor will the 
  Borrower permit the Parent to, incur or contract to incur Capital 
  Expenditures of more than $100,000 in any one transaction.

    11.  WAIVER OF DEFAULTS. The Borrower is in default of the following 
provisions of the Agreement (collectively, the "Defaults"): 

    (a)  Section 6.16  MINIMUM NET INCOME. The Borrower is in default of the
  minimum Net Income covenant for the months ending as set forth below: 

        Month         Actual Net Income               Minimum Net Income
        -----         -----------------               ------------------

    April 30, 1996       ($225,131)                       ($120,000)
    May 31, 1996         ($265,347)                       ($110,000)
    June 30, 1996        ($283,657)                        ($70,000)
    July 31, 1996        ($275,275)                        ($50,000)

In addition, to the extent that the Borrower made any payments on the 
Subordinated Debt after these Defaults had occurred, such payments constitute 
an Event of Default under the Credit Agreement. Upon the terms and subject to 
the conditions set forth in this First Amendment, the Bank hereby waives the 
Defaults. This waiver shall be effective only in this specific instance and 
for the specific purpose for which it is given, and this waiver shall not 
entitle the Borrower to any other or further waiver in any similar or other 
circumstances.

    12.  NO OTHER CHANGES. Except as explicitly amended by this First 
Amendment, all of the terms and conditions of the Credit Agreement shall 
remain in full force and effect and shall apply to any advance or letter of 
credit thereunder.

    13.  AMENDMENT, DEFAULT WAIVER AND EXTENSION FEES. The Borrower agrees to 
pay the Lender a fully earned, non-refundable fee in the amount of $5,000 in 
consideration of the execution by the Lender of this Amendment;  $2,500 of 
such fee shall be due and payable to the Lender on the date of this First 
Amendment and the remaining $2,500 shall be due and payable to the Lender on 
November 1, 1996.  In addition, the Borrower agrees to pay the Lender a fully 
earned, non-refundable fee in the amount of $3,000 in consideration for 
extending the Credit Facility, payable no later than January 2, 1997.

    14.  CONDITIONS PRECEDENT. This First Amendment and the waiver set forth 
in paragraph 10 shall be effective when the Lender shall have received an 
executed original


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hereof, together with each of the following, each in substance and form 
acceptable to the Lender in its sole discretion: 

         (a)  A Certificate of the Secretary of the Borrower certifying as to
     (1) the resolutions of the board of directors of the Borrower approving the
     execution and delivery of this First Amendment, (2) the fact that the
     Articles of Incorporation and Bylaws of the Borrower, which were certified
     and delivered to the Lender pursuant to the Certificate of Authority of the
     Borrower's Secretary dated as of January 3, 1996 (the "Certificate of
     Authority") in connection with the execution and delivery of the Credit
     Agreement continue in full force and effect and have not been amended or
     otherwise modified except as set forth in the Certificate to be delivered,
     and (3) certifying that the officers and agents of the Borrower who have
     been certified to the Lender, pursuant to the Certificate of Authority, as
     being authorized to sign and to act on behalf of the Borrower continue to
     be so authorized or setting forth the sample signatures of each of the
     officers and agents of the Borrower authorized to execute and deliver this
     First Amendment and all other documents, agreements and certificates on
     behalf of the Borrower.

         (b)  Payment of the fees described in paragraph 12.

         (c)  Such other matters as the Lender may require.

         15.  REPRESENTATIONS AND WARRANTIES. The Borrower hereby represents 
and warrants to the Lender  as follows: 

         (a)  The Borrower has all requisite power and authority to execute 
     this First Amendment and to perform all of its obligations hereunder, 
     and this First Amendment has been duly executed and delivered by the 
     Borrower and constitutes the legal, valid and binding obligation of the 
     Borrower, enforceable in accordance with its terms.

         (b)  The execution, delivery and performance by the Borrower of this 
     First Amendment has been duly authorized by all necessary corporate 
     action and does not (i) require any authorization, consent or approval 
     by any governmental department, commission, board, bureau, agency or 
     instrumentality, domestic or foreign, (ii) violate any provision of any 
     law, rule or regulation or of any order, writ, injunction or decree 
     presently in effect, having applicability to the Borrower, or the 
     articles of incorporation or by-laws of the Borrower, or (iii) result in 
     a breach of or constitute a default under any indenture or loan or 
     credit agreement or any other agreement, lease or instrument to which 
     the Borrower is a party or by which it or its properties may be bound or 
     affected.

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         (c)  All of the representations and warranties contained in Article 
     V of the Credit Agreement are correct on and as of the date hereof as 
     though made on and as of such date, except to the extent that such 
     representations and warranties relate solely to an earlier date.

         16.  REFERENCES. All references in the Credit Agreement to "this 
Agreement" shall be deemed to refer to the Credit Agreement as amended 
hereby; and any and all references in any other Loan Document to the Credit 
Agreement shall be deemed to refer to the Credit Agreement as amended hereby.

         17.  NO OTHER WAIVER. Except as set forth in paragraph 10 hereof, 
the execution of this First Amendment and acceptance of any documents related 
hereto shall not be deemed to be a waiver of any Default or Event of Default 
under the Credit Agreement or breach, default or event of default under any 
Security Document or other document held by the Lender, whether or not known 
to the Lender and whether or not existing on the date of this First Amendment.

         18.  RELEASE. The Borrower hereby absolutely and unconditionally 
releases and forever discharges the Lender, and any and all parent 
corporations, subsidiary corporations, affiliated corporations, insurers, 
indemnitors, successors and assigns thereof, together with all of the present 
and former directors, officers, agents and employees of any of the foregoing, 
from any and all claims, demands or causes of action of any kind, nature or 
description, whether arising in law or equity or upon contract or tort or 
under any state or federal law or otherwise, which the Borrower has had, now 
has or has made claim to have against any such person for or by reason of any 
act, omission, matter, cause or thing whatsoever arising from the beginning 
of time to and including the date of this First Amendment, whether such 
claims, demands and causes of action are matured or unmatured.

         19.  COSTS AND EXPENSES. The Borrower hereby reaffirms its agreement 
under the Credit Agreement to pay or reimburse the Lender on demand for all 
costs and expenses incurred by the Lender in connection with the Credit 
Agreement, the Security Documents and all other documents contemplated 
thereby, including without limitation all reasonable fees and disbursements 
of legal counsel. Without limiting the generality of the foregoing, the 
Borrower specifically agrees to pay all fees and disbursements of counsel to 
the Lender for the services performed by such counsel in connection with the 
preparation of this First Amendment and the documents and instruments 
incidental hereto. The Borrower hereby agrees that the Lender may, at any 
time or from time to time in its sole discretion and without further 
authorization by the Borrower, make a loan to the Borrower under the Credit 
Agreement, or apply the proceeds of any loan, for the purpose of paying any 
such fees, disbursements, costs and expenses and the fee required under 
paragraph 12 hereof.


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         20.  MISCELLANEOUS. This First Amendment may be executed in any 
number of counterparts, each of which when so executed and delivered shall be 
deemed an original and all of which counterparts, taken together, shall 
constitute one and the same instrument.


                          [SIGNATURE PAGE FOLLOWS]





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<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this First Amendment 
to be duly executed as of the date first written above.


NORWEST BANK MINNESOTA,                       MACUSA, INC.
 NATIONAL ASSOCIATION


                                              By /s/ Joel A. Ronning
By [illegible]                                   ----------------------------
  ------------------------------                 Joel A. Ronning
  Its Vice President                             Its President
      --------------------------




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<PAGE>


                          ACKNOWLEDGMENT AND AGREEMENT OF GUARANTORS

         The undersigned, each a guarantor of the indebtedness of MacUSA, 
Inc. (the "Borrower") to Norwest Bank Minnesota, National Association (the 
"Lender") pursuant to separate guaranties each dated as of January 3, 1996 
(each, a "Guaranty"), hereby (i) acknowledges receipt of the foregoing First 
Amendment; (ii) consents to the terms (including without limitation the 
release set forth in paragraph 18 of the First Amendment) and execution 
thereof; (iii) reaffirms his or its respective obligations to the Lender 
pursuant to the terms of his or its respective Guaranty; and (iv) 
acknowledges that the Lender may amend, restate, extend, renew or otherwise 
modify the Credit Agreement and any indebtedness or agreement of the 
Borrower or enter into any agreement or extend additional or other credit 
accommodations, without notifying or obtaining the consent of the undersigned 
and without impairing the liability of the undersigned under his or its 
respective Guaranty for all of the Borrower's present and future indebtedness 
to the Lender.

TECH SQUARED, INC.                     TABOR RESOURCES, INC.




By /s/ Joel A. Ronning                 By /s/ Joel A. Ronning
  ---------------------------             --------------------------
   Joel A. Ronning                         Joel A. Ronning
   Its President                           Its President


PERIPHERAL LAND, INC.


                                          /s/ Joel A. Ronning     
By /s/ Joel A. Ronning                 --------------------------
  ---------------------------          
  Joel A. Ronning
  Its President