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.