    AST RESEARCH, INC.           TECHNICAL BULLETIN # 0954                7-29-94

                    DESKTOP SYSTEMS WITH ADAPTEC PCI ADAPTER EXPANSION SLOTS

    PROBLEM:        The Adaptec PCI SCSI Controller, model AHA-2940 does not allow
                    a susccessful installation of Windows NT, version 3.1 if using
                    a Sony CD-ROM drive, model  CDU-541.  However, Windows NT does
                    install correctly when using a later version of Sony’s CD-ROM,
                    such as CDU-561.

    CAUSE:          Adaptec driver incompatibility.  The Adaptec driver does not
                    support the Sony CDU-541 drive.

    SYSTEMS
    AFFECTED:          AST                                                REVISION
                    PART NUMBER       DESCRIPTION                           LEVEL
                    501440-XXX      BRAVO MS4-33S                            All
                    501441-XXX      BRAVO MS4-50S                            All
                    501442-XXX      BRAVO MS4-66D                            All
                    501443-XXX      BRAVO MS4-100T                           All
                    501288-XXX      PREMMIA LX P60                           All
                    501289-XXX      PREMMIA LX P66                           All
                    501429-XXX      PREMMIA MX 4-66D                         All
                    501430-001      PREMMIA MX 4-66D/543M                    All
                    501432-XXX      PREMMIA MX 4-100T                        All
                    501457-XXX      PREMMIA GX P90                           All
                    501522-XXX      PREMMIA GX P100                          All

    SOLUTION:       Adaptec is aware of this problem and is working on a solution.
                    For further information call Adaptec’s Technical Support at
                    (408) 945-2550.