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    AST RESEARCH, INC.           TECHNICAL BULLETIN # 1016                11-16-94

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                   BRAVO LC 4/50S AND 0S/2 1.3 MOUSE AND FLOPPY ISSUE

    PROBLEM:        Under OS/2 version 1.3, the Bravo LC 4/50s system locks up
                    when the mouse is moved, during floppy access, when no floppy
                    is present.

    CAUSE:          OS/2 version 1.3 video drivers are not supported by Cirrus
                    Logic chipset.

    SYSTEMS
    AFFECTED:           AST
                    PART NUMBER      DESCRIPTION

                    501433-G08      BRAVO LC 4/50S

    SOLUTION:       Upgrade the operating system to OS/2, version 2.1, which
                    supports Cirrus GD5428 video drivers, or use an external video
                    adapter that is compatible with the standard Microsoft VGA
                    driver.