[Letterhead of The Ashton Technology Group, Inc.]




March 22, 1996




Computer Science Innovations, Inc.
1235 Evans Road
Melbourne, FL 32904-2314

Attention:        Mr. George Milligan
                  President

Subject:          Time and Material Contract No. ASH-10261


Gentlemen:

         Reference subject contract, the provisions of limitation of funds shown
in paragraph 3b. is hereby amended to increase the spending ceiling to $300,000.
In addition,  the  provisions of paragraph 4b. are hereby  modified to show that
the definitized contract will be negotiated prior to May 31, 1996.

         If  the  foregoing  is   satisfactory  to  you,  please  indicate  your
acceptance  hereof by signing  and  returning  the  enclosed  extra  copy.  Such
acceptance  will  constitute  this as a contract on the terms and conditions set
forth herein. Telefacsimile signatures shall be effective as originals.

         Very truly yours,


Ashton Technology Group, Inc.      Accepted this 29 day of March, 1996
                                   Computer Science Innovations, Inc.



By:    /s/ John Blohm              By:     /s/ George Milligan
       (Signature)                         (Signature)



for Raymond T. Tate                George H. Milligan
President                          President


<PAGE>


                [Letterhead of The Ashton Technology Group, Inc.]




May 15, 1996




Computer Science Innovations, Inc.
1235 Evans Road
Melbourne, FL 32904-2314

Attention:        Mr. George Milligan
                  President

Subject:          Time and Material Contact No. ASH-10261


Gentlemen:

         Reference subject contract, the provisions of limitation of funds shown
in  paragraph  3b. is  hereby  amended  to  increase  the  spending  ceiling  to
$1,046,456.00.  In addition, the provisions of paragraph 4b. are hereby modified
to show that the definitized  contract will be negotiated  prior to December 31,
1996.

         If  the  foregoing  is   satisfactory  to  you,  please  indicate  your
acceptance  hereof by signing  and  returning  the  enclosed  extra  copy.  Such
acceptance  will  constitute  this as a contract on the terms and conditions set
forth herein. Telefacsimile signatures shall be effective as originals.

Very truly yours,


Ashton Technology Group, Inc.        Accepted this 15 day of May, 1996
                                     Computer Science Innovations, Inc.



By:    /s/ John Blohm                By:     /s/ George Milligan
       (Signature)                           (Signature)



for Raymond T. Tate                  George H. Milligan
President                            President


<PAGE>


                [Letterhead of The Ashton Technology Group, Inc.]




December 16, 1996




Computer Science Innovations, Inc.
1235 Evans Road
Melbourne, FL 32904-2314

Attention:        Mr. George Milligan
                  President

Subject:          Contact No. ASH-LC10261 dated October 26, 1995


Gentlemen:

Reference  subject  contract,  the  provisions  of  limitation of funds shown in
paragraph 3(b) is hereby amended to increase the spending  ceiling to $1,212,228
(which includes reserves to be approved by UTTC). In addition, the provisions of
paragraph 4 are hereby modified to indicate that a definitized  contract (valued
at  $1,212,228)  is hereby  completed  (see enclosed  spreadsheet)  and that the
contract end date has been determined to be 31 January 1997.

If the foregoing is satisfactory to you, please indicate your acceptance  hereof
by signing and  returning  the enclosed  extra copy.  Upon your  acceptance  and
signature,  this letter will constitute an amendment to the referenced  contract
and will supersede all previous amendments to the referenced contract.
Telefacsimile signatures shall be effective as originals.

Very truly yours,


Ashton Technology Group, Inc.          Accepted this 20 day of Dec, 1996
                                       Computer Science Innovations, Inc.



By:    /s/ F. Rittereiser              By:     /s/ George Milligan
       (Signature)                             (Signature)



Mr. Fred Rittereiser                   Mr. George Milligan
President                              President



Universal Trading Technologies, Inc.



By:    /s/ Fred Weingard 12-16-96
       (Signature)



Mr. Fred S. Weingard
Executive Vice President


<PAGE>


                [Letterhead of The Ashton Technology Group, Inc.]




February 5, 1997

Computer Science Innovations, Inc.
1235 Evans Road
Melbourne, FL 32904-2314

Attention:        Mr. George Milligan
                  President

Subject: Contract No. ASH-LC10261

Reference:        (1) Contract No. ASH-LC10261 dated October 26, 1995
                  (2) Contract Definition dated December 16, 1996


Gentlemen:

Reference (2) modifies and defines  reference (1). The purpose of this letter is
to provide a cost & time  extension to  definitized  contract  ASH-LC10261.  The
basis of  estimate  (BOE) and terms &  conditions  (T&Cs) are  attached  to this
letter.  Paragraph 3(b) is hereby amended to increase the spending  ceiling from
$1,212,228 to $1,306,000.  In addition, the provisions of Paragraph 4 are hereby
modified to indicate a new  definitized  contract  (valued at  $1,306,000)  that
incorporates  the  attached BOE and T&Cs and has a contract end date shall be 28
March  1997 or when  the  level-of-effort  (LOE)  for all key  staff  runs  out,
whichever comes first.

If the foregoing is satisfactory to you, please indicate your acceptance  hereof
by signing and  returning  the enclosed  extra copy.  Upon your  acceptance  and
signature,   this  letter  will  constitute  an  incremental  amendment  to  the
referenced contract. Telefacsimile signatures shall be effective as originals.

Very truly yours,


Ashton Technology Group, Inc.          Accepted this 18 day of Feb 1996
                                       Computer Science Innovations, Inc.



By:    /s/ Fred Rittereiser            By:     /s/ George Milligan
       (Signature)                             (Signature)



Mr. Fred Rittereiser                   Mr. George Milligan
President                              President



Universal Trading Technologies, Corp.



By:    /s/ Fred Weingard
       (Signature)



Mr. Fred S. Weingard
Executive Vice President