EXHIBIT "A" Agreement in Writing in Accordance with SEC Rule 13d-1(f)(1)(iii) The undersigned hereby agree: 1. that each of them is responsible for the timely filing of Form 13D and any amendments thereto with regard to Tyler Corporation, and for the...

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                                  EXHIBIT "A"

         Agreement in Writing in Accordance with SEC Rule 13d-1(f)(1)(iii)

    The undersigned hereby agree:

    1.       that each of them is responsible for the timely filing of Form 
             13D and any amendments thereto with regard to Tyler Corporation,
             and for the completeness and accuracy of the information concerning
             each of them that is contained therein; and,

    2.       such Form 13D identifies each of the undersigned, contains the 
             required information with regard to each of the undersigned, and is
             filed on behalf of each of the undersigned.


Dated:  September 18, 1997.

                                        RICHMOND PARTNERS, LTD.



                                        By: /s/ XXXXX X. XXXXXX
                                           --------------------------------
                                           Xxxxx X. Xxxxxx, General Partner


                                        /s/ XXXXX X. XXXXXX
                                        -----------------------------------
                                        Xxxxx X. Xxxxxx, Individually