    AST RESEARCH, INC.        TECHNICAL BULLETIN # 0948                   7-18-94

                   BRAVO LC AND LBA DRIVES RUNNING WINDOWS 32 BIT ACCESS

    PROBLEM:        Unable to run Windows 32 bit disk access on LBA drives, such
                    as the WD-1270 drive, in the Bravo system.

    CAUSE:          Windows lacks an effective driver to support the Logical Block
                    Address (LBA) translation mode.  When operating in this mode,
                    Windows 32 bit disk access is not supported.  In order for the
                    current version of the system BIOS to be effective in
                    supporting this mode, the proper driver is required.

    SYSTEMS
    AFFECTED:           AST                                     REVISION
                    PART NUMBER     DESCRIPTION                   LEVEL
                    501378-XXX      BLC4-33S                       All
                    501379-XXX      BLC4-33                        All
                    501380-XXX      BLC4-66D                       All
                    501381-XXX      BLC4-100T                      All
                    501433-XXX      BLC4-50S                       All
                    501548-XXX      BLC4-50D                       All

    SOLUTION:       In System Setup change the AST preset drive type from AUTO to
                    USER DEFINED.  Using this feature the LBA translation mode
                    will not be enabled but the 32 bit Windows disk access will be
                    supported.