    AST RESEARCH, INC.         TECHNICAL BULLETIN #0730                  01-06-92

            AST SYSTEMS WITH PS/2 MOUSE PORT AND CH PRODUCTS ROLLER MOUSE

    PROBLEM:       When a CH Products Roller Mouse is attached to the AST PS/2
                   type mouse port , it will lock up the keyboard or display the
                   following error message after POST:

                   "Mouse not installed"

    CAUSE:         Incompatibility between CH Products Roller Mouse and AST's
                   PS/2 mouse port.

    AFFECTED
    SYSTEM:        AST Premium 386SX-20 and Bravo 486-25 with the following
                   system board part numbers:

                   202382-002 and 202385-001

    SOLUTION:      This problem has been resolved with release 1.02.01 of the
                   keyboard controller, part number 237002-002 revision A.
                   Customers experiencing this problem should have their keyboard
                   controller upgraded.