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    AST RESEARCH, INC.         TECHNICAL BULLETIN # 1117               3-28-95

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    	 BRAVO MS-T P/90 BEEPS AT BOOTUP WITH ADAPTEC 1570 ADAPTER INSTALLED

    PROBLEM

    When a SCSI hard drive is connected to an Adaptec 1570, the adapter card may
    cause the Bravo MS-T P/90 system to generate beeps at bootup.

    CAUSE

    The Adaptec 1570 adapter card is not compatible with the Bravo MS-T P/90
    Plug-n-Play system.

    During the ROM scan sequence, the Adaptec 1570 BIOS selects system memory
    occupied by BIOS housekeeping during POST.  This area contains variables,
    tables, and pointers used to decide where Plug-n-Play resources are to be
    setup.  The Adaptec BIOS uses this same area for its initialization, erasing
    the data needed for use later.  When the beep code is generated, it usually
    wipes out a Memory Control Block the BIOS needs to finish its work.

    SYSTEMS AFFECTED
    AST PART NUMBER AND DESCRIPTION

    501660-001     BRAVO MS-T P/90

    SOLUTION

    Use an adapter card that is compatible with Plug-n-Play systems.