    AST RESEARCH, INC.         TECHNICAL BULLETIN #0728                  12-26-91

                   AST BRAVO 486/25 VIDEO BIOS ERRORS DURING POST

    PROBLEM:       When using a third party video card as the primary video in an
                   AST Bravo 486/25, the following error message will be
                   displayed during POST:

                   "Cannot shadow video BIOS in shadow ram"
                   "Press F1 key to continue or CTRL-ALT-ESC to setup"

    AFFECTED
    SYSTEMS:       Bravo 486/25 system board with the following part number:

                   202385-001

    CAUSE:         System BIOS Rel 1.10 does not have the option to disable the
                   shadow BIOS.

    SOLUTION:      This problem has been resolved with release 1.20 of the system
                   BIOS.  This system BIOS consist of two chips, part number
                   237801-003 and 237802-003 revision A.  Customers experiencing
                   the above problem should have the system BIOS upgraded.