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    AST RESEARCH, INC.           TECHNICAL BULLETIN # 1159              4-26-95

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    			 ADAPTEC PCI SCSI CONFLICT IN MANHATTAN P SERVER

    PROBLEM

    Manhattan P systems using the integrated NCR SCSI controller and two Adaptec
    2940 PCI SCSI controllers will not see the last physical drive attached to
    the second Adaptec controller under Novell Netware 3.12.

    CAUSE

    The integrated NCR SCSI controller is in conflict with the second PCI slot
    (PCI slot #2) on the Manhattan P system board.  The conflict arises due to
    the configuration of the interrupts for the NCR SCSI controller.
    The interrupts are fixed, and even when disabled, they conflict with the
    add-in device in PCI slot #2.

    SYSTEMS AFFECTED
    AST PART NUMBER AND DESCRIPTION    REVISION

    501500-XXX     Manhattan V5090     All Models
    501502-XXX     Manhattan P5090     All Models

    SOLUTION

    AST BIOS release 1.09 resolves the interrupt conflict with the on-board NCR
    SCSI controller.  The system BIOS should be flashed to a minimum level of
    release 1.09 to resolve the problem.

    BIOS Release 1.09 has AST Part Number 905547-038 and it is available on the
    AST On-line BBS and On-line services.

    File 05547038.EXE can be found on AST's BBS (817) 230-6850, in the "Systems"
    file area.  AST's BBS supports modem speeds up to 28.8k bps.
    The above file will also be posted on:

    CompuServe
    Go ASTSUPPORT

    AST Worldwide Web Site
    http://www.ast.com

    For further information regarding BIOS 1.09, see Software Bulletin # 0178C.