    AST RESEARCH, INC.         SOFTWARE BULLETIN #0737A               11-1-93

                        PREMIUM EXEC AND MICROSOFT PS/2 MOUSE

    Problems have been reported with some Microsoft PS/2 Serial, PS/2, or
    Ballpoint Mice when attached to the mouse port of AST Premium Exec 386SX-20
    and 386SX-25 systems.  The mouse may exhibit either intermittent operation or
    a failure to initialize after executing the mouse driver.  This problem does
    not occur if the same mouse is attached to the Premium Exec's serial port.

    The cause of the problem is that some Microsoft Mice release the clock and
    data lines too quickly when the system is first powered on.  The problem has
    been resolved on Premium Exec 386SX-20 systems with version 1.05 of the
    Keyboard BIOS and on Premium Exec 386SX/25 systems with version 1.15 System
    BIOS.

    Premium Exec users experiencing this problem should contact an AST Authorized
    Service Center and obtain the following:

           PRODUCT                   DESCRIPTION           PART NUMBER

        Premium Exec 386SX-20    BIOS Upgrade 1.07/1.05    500892-001
        Premium Exec 386SX-25    System BIOS 1.15          237838-005