Document:

EXHIBIT 10.1

            AGREEMENT TO EXTEND AND AMEND LOAN AND SECURITY AGREEMENT

         This Agreement is entered into this 5th day of November, 2003 by and
between the Estate of William S. Sadler, 1370 West Ryan Avenue, Roseville, MN
55113 (the "Estate") and Dotronix, Inc., a Minnesota corporation, with its
principal place of business located at 160 First Street S.E., St. Paul Minnesota
55112-7894 ("Dotronix"), to amend that certain Loan and Security Agreement dated
February 23, 2000 (the "Loan Agreement"), as amended, originally entered into by
and between William S. Sadler ("Sadler") and Dotronix.

WHEREAS, the Dotronix and the Estate are parties to the Loan Agreement and wish
to extend the term of such Loan Agreement and to alter some of the terms of the
Loan Agreement; and

WHEREAS, the Estate is willing to forgive $850,000 of the $1,000,000 principal
amount currently owing under the Loan Agreement in exchange for the transfer of
certain real property located in Eau Claire, Wisconsin owned by Dotronix; and

WHEREAS, the signing of this agreement to amend and extend the term of such Loan
Agreement is a condition precedent to Dotronix finalizing a revolving credit
agreement with Terry L. Myhre;

NOW, THEREFORE, in consideration of the premises and the mutual covenants herein
contained, the parties hereto agree as follows:

1.       In exchange for the other consideration forth in this Agreement and
         contingent on Dotronix performing its obligations set forth herein, the
         principal amount due and owing under the Loan Agreement is reduced from
         $1,000,000 to $150,000 and the fulfillment of the obligations of
         Dotronix hereunder (including the transfer of real estate in Section 3
         hereof) shall constitute full and final payment for such forgiven
         principal amount.

2.       The Loan Agreement is hereby amended to reflect the following changes
         to the terms of the Loan Agreement:

         (a)      The Maximum Dollar Amount set forth in Section 2.1.A of the
                  Schedule, the dollar amount set forth in Section 2.1.C of the
                  Schedule, the principal amount of the Note, and the amount
                  secured by the Collateral Documents shall be $150,000.

         (b)      The Maturity Date set forth in Section 9.1 of the Schedule and
                  in the Note shall be November 30, 2008.

         (c)      The interest rate shall be 5% per annum, payable monthly.

         (d)      The amended Loan Agreement shall be subordinate to the
                  Revolving Credit Agreement between Dotronix and Terry L.
                  Myhre.

<PAGE>

3.       The Estate will have an option to convert the principal amount due
         under the Loan Agreement into Dotronix common stock at a conversion
         price of $1.00 per share issued at any time after the Dotronix stock
         has closed at $1.00 per share for 20 consecutive trading days. This
         option shall be exercisable no later than sixty (60) days prior to the
         end of the term of the Loan Agreement.

4.       Dotronix will transfer title and ownership of the Eau Claire, Wisconsin
         property, as more fully described in Exhibit A hereto, currently owned
         by Dotronix within thirty (30) days of the execution of this Agreement.

5.       As further consideration for this Agreement and the amendment of the
         Loan Agreement and upon transfer of title and ownership of the Eau
         Claire , Wisconsin property, the Estate shall surrender to Dotronix
         warrants to purchase up to three hundred sixty five thousand (365,000)
         shared of Dotronix common stock that were issued to William S. Sadler
         as consideration for loans made to Dotronix, and in exchange, Dotronix
         shall grant to the Estate a seven-year warrant to purchase up to three
         hundred eighty five thousand (385,000) shares of Dotronix common stock
         at an exercise price of five cents ($.05) per share.

6.       As a condition precedent to the obligations of the Estate hereunder,
         Dotronix must reach an agreement with the Terry L. Myhre to enter into
         a revolving credit agreement, according to the terms set forth in
         Exhibit B hereto.

7.       In addition:

         (a)      The parties shall each pay their own fees and expenses related
                  to the transactions contemplated agreed to herein, including,
                  without limitation, attorney and accountant fees.

         (b)      The transactions contemplated herein are confidential and may
                  not be disclosed to anyone other than the parties' respective
                  legal and financial representatives, to Terry L. Myhre and his
                  legal and financial representatives, and except as required by
                  law (including the public disclosure obligations of Dotronix),
                  without the consent of the other party.
<PAGE>

         (c)      The purpose of this Agreement is to set forth the essential
                  terms and conditions of the agreement of the parties. Upon
                  execution of this Agreement, the parties shall prepare
                  definitive documents to fully reflect the parties
                  understanding and agreement, which definitive documents shall
                  replace this Agreement.

         (d)      Time is of the essence to this Agreement and the parties agree
                  to use their best efforts to complete the documentation agreed
                  to herein by November 14, 2003.

         (e)      This Agreement shall be binding upon and insure to the benefit
                  of the parties, their respective successors and their assigns.

         (f)      Capitalized terms which are used in this Agreement and are not
                  otherwise defined in this Agreement have the meanings assigned
                  to them in the Loan Agreement. Dotronix' secured promissory
                  note to Sadler dated February 23, 2000 is referred to as the
                  "Note", and the documents referred to in Section 5.12 of the
                  Schedule to the Loan Agreement are referred to as the
                  "Collateral Documents".

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed
on the day and year first above written.

                                   The Estate of William S. Sadler

                                   By its Personal Representatives

                                   /s/ Dorothy E. Sadler
                                   ----------------------------------------
                                   Dorothy E. Sadler

                                   /s/ Jill D. Sadler
                                   ----------------------------------------
                                   Jill D. Sadler

                                   /s/ Kurt T. Sadler
                                   ----------------------------------------
                                   Kurt T. Sadler

                                   DOTRONIX, INC.

                                   By  /s/ Robert V. Kling
                                      -------------------------------------
                                       Robert V. Kling
                                       Its Chief Financial Officer

<PAGE>

                                    EXHIBIT A

                                 to that certain
            AGREEMENT TO EXTEND AND AMEND LOAN AND SECURITY AGREEMENT

                                LEGAL DESCRIPTION

Lots 1, 2, 3, 4, and 5, Block 1, Chamber of Commerce Addition to the City of Eau
Claire, Chippewa County, Wisconsin

                                    EXHIBIT B

                        REVOLVING CREDIT AGREEMENT TERMS

         1.       Terry L. Myhre shall loan to Dotronix an amount up to a
                  maximum of four hundred fifty thousand dollars ($450,000),
                  pursuant to a revolving credit agreement, containing usual and
                  customary terms agreed to by the parties (the "Revolving
                  Credit Agreement").

         2.       The term of the Revolving Credit Agreement shall be one year
                  from the date of its execution by the parties.

         3.       The interest rate on funds borrowed by Dotronix under the
                  Revolving Credit Agreement shall be five percent (5%) per
                  annum, payable monthly on the outstanding balance.EXHIBIT 10.2

                  OPTION AGREEMENT AND AGREEMENT TO AMEND LEASE

         This Agreement is entered into this 5th day of November, 2003 by and
between the Estate of William S. Sadler, 1370 West Ryan Avenue, Roseville, MN
55113 (the "Estate"), Minnesota River Aviation Inc., a Minnesota corporation,
with its principal place of business located at 1370 Ryan Ave W, St Paul,
Minnesota 55113 ("MRAI"), Terry L. Myhre, an individual, of 9691 101st Street
North, Stillwater, Minnesota 55082 ("Myhre"), and Dotronix, Inc., a Minnesota
corporation, with its principal place of business located at 160 First Street
S.E., St. Paul, Minnesota 55112-7894 ("Dotronix").

WHEREAS, Dotronix and the Estate are parties to a certain Agreement to Extend
and Amend Loan and Security Agreement (the "Loan Amendment"), and Dotronix and
Myrhe are parties to a certain Agreement to Loan Funds (the "Funds Agreement"),
both such agreements of even date herewith; and

WHEREAS, the parties agree that the Loan Amendment and the Funds Agreement are
contingent upon the signing of this Agreement;

NOW, THEREFORE, in consideration of the premises and the mutual covenants herein
contained, as well as the consideration set forth in the Loan Amendment and the
Funds Agreement, the parties hereto agree as follows:

1.       Upon the fulfillment of the parties' obligations under the Loan
         Amendment and the Funds Agreement, the Estate and MRAI shall grant
         options to Myhre to purchase an aggregate of up to one million
         (1,000,000) shares of Dotronix common stock from the Estate and MRAI at
         five cents ($.05) per share. These options must be exercised, if at
         all, not later than seven (7) years from the date of this Agreement.

2.       Upon the fulfillment of the parties' obligations under the Loan
         Amendment and the Funds Agreement, the Estate and Dotronix shall amend
         the Lease dated April 26, 1999 by and between Dotronix and William S.
         Sadler, with respect to real property located at 160 First Street SE,
         New Brighton, Minnesota 55112, so as to enable Dotronix to terminate
         the Lease without cause at any time in its sole discretion upon twelve
         (12) months prior written notice.

3.       In addition:

         (a)      The parties shall each pay their own fees and expenses related
                  to the transactions contemplated and agreed to herein,
                  including, without limitation, attorney and accountant fees.

         (b)      The transactions contemplated herein are confidential and may
                  not be disclosed to anyone other than the parties' respective
                  legal and financial representatives, and except as required by
                  law (including the public disclosure obligations of Dotronix),
                  without the consent of the other party.

<PAGE>

         (c)      The purpose of this Agreement is to set forth the essential
                  terms and conditions of the agreement of the parties. Upon
                  execution of this Agreement, the parties shall prepare
                  definitive documents to fully reflect the parties
                  understanding and agreement, which definitive documents shall
                  replace this Agreement.

         (d)      Time is of the essence to this Agreement and the parties agree
                  to use their best efforts to complete the documentation agreed
                  to herein by November 14, 2003.

         (e)      This Agreement shall be binding upon and insure to the benefit
                  of the parties, their respective successors and their assigns.

         (f)      Capitalized terms which are used in this Agreement and are not
                  otherwise defined in this Agreement have the meanings assigned
                  to them in the Loan Amendment and the Funds Agreement.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed
on the day and year first above written.

                                      The Estate of William S. Sadler
                                      By its Personal Representatives

                                      /s/ Dorothy E. Sadler
                                      -------------------------------------
                                      Dorothy E. Sadler

                                      /s/ Jill D. Sadler
                                      -------------------------------------
                                      Jill D. Sadler

                                      /s/ Kurt T. Sadler
                                      -------------------------------------
                                      Kurt T. Sadler

                                      MINNESOTA RIVER AVIATION, INC

                                      By: /s/ Kurt T. Sadler
                                      -------------------------------------
                                      Its: Officer

                                      /s/ Terry L. Myhre
                                      -------------------------------------
                                      Terry L. Myhre

                                      DOTRONIX, INC.

                                      By  /s/ Robert V. Kling
                                      -------------------------------------
                                      Robert V. Kling
                                      Its Chief Financial Officer

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