    AST RESEARCH, INC.         TECHNICAL BULLETIN #0736                  01-21-92

                          PREMIUM 486/25 AND IMSI PET MOUSE

    PROBLEM:       When using a Pet Mouse, a PS/2 compatible mouse manufactured
                   by Imsi on a Premium 486-25 the following errors will occur:

                   - The system will lock up with the Pet Mouse plugged into the
                     mouse port (motherboard part number 202360-001).

                   - If the system passes its POST test the Pet Mouse will be
                     recognized as a serial mouse connect to COM1: IRQ: 4 I/O:
                     3F8, instead of a PS/2 mouse.

    CAUSE:         The cause of this problem is the keyboard controller revision
                   1.01, which is located at U15.

    SYSTEM
    AFFECTED:      All systems that have motherboard part number 202360-001.

    SOLUTION:      This problem is resolved by replacing the revision 1.01
                   keyboard controller with revision 1.02.  This keyboard
                   controller (part number 237002-002) can be ordered through
                   AST's Product Support Department.