    AST RESEARCH, INC.         TECHNICAL BULLETIN #0696A                 08-16-91

                  SCO UNIX BOOT FAILURE WITH MEMORY EXPANSION BOARD

    PROBLEM:         Under SCO UNIX 3.2 version 2.0, system will hang
                     intermittently during boot if memory expansion board is
                     present, AST part number 202387-001.

    AFFECTED
    SYSTEM BOARDS:   All system boards with the following part numbers:

                     202356-004 and 202360-001

    CAUSE:           During UNIX installation the software will check for known
                     devices and will activate a driver for that device.  UNIX
                     mistakenly identifies a device that is not present, and
                     activates a driver for it.  This causes the system to hang,
                     with the following error message:

                     WDHA-OUT: command byte 01 rejected
                     WDHA-OUT: command byte 07 rejected

    SOLUTION:        The new release of SCO UNIX 3.2 version 3.0 resolves this
                     problem and is scheduled to be released by SCO in July,
                     1991.

                     NOTE: A temporary solution would be to slow the system down
                           during the boot process, and resume normal speed after
                           completion of boot sequence, which would be the login
                           prompt.  This can be accomplished by using the
                             and
                           sequence.  For further information on speed commands,
                           please refer to your systems user manual.