    =

    AST RESEARCH, INC.          TECHNICAL BULLETIN # 1215               6-6-95

    =

    SCO UNIX INSTALL FAILS WITH MANHATTAN G590

    PROBLEM

    During installation of SCO UNIX and ODT version 3.0, in a Manhattan G590
    with the DPT PCI SCSI Controller (PM3224), after loading the DPT UNIX driver,
    the operating system displays the following error message:

    "WARNING: SCSI ADAPTER: CAN NOT INSTALL INTR VECNO=10,
    TYPE=2, IPL=5, VECTOR 10 IS PRIVATE."

    CAUSE

    SCO UNIX requires IRQ 10 to be reserved for its own use.  The Manhattan G590
    has assigned the DPT PM3224 PCI SCSI Controller to IRQ10, causing the
    installation to fail.  There is no mechanism for changing the IRQ assignment
    of a PCI adapter in a PCI/ISA based system.

    SYSTEMS AFFECTED
    AST PART NUMBER AND DESCRIPTION     REVISION

    501723-XXX      MANHATTAN G590      All Models

    SOLUTION

    Manhattan G590 BIOS Release 2.00 (P/N 905545-038) resolves this issue by
    changing the manner in which the IRQs are assigned.  IRQ10 is now used as
    the last IRQ to be assigned by a device installed in the system.

    File 05545038.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 on the Manhattan G590 BIOS, see Software Bulletin
    # 0186 in the SBS library of AST's BBS.