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    AST RESEARCH, INC.         TECHNICAL BULLETIN # 1172                 5-8-95

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    MANHATTAN P, V, AND G SYSTEMS WITH DPT PM3224 TWO CHANNEL
    PCI DISK ARRAY CONTROLLERS

    PROBLEM

    The SX4000 daughter card (2nd channel board) associated with the DPT PM3224
    controller on the Manhattan P, V, and G systems can cause the following errors:

    Netware:
    The system fails to mount volumes reporting errors such as:
    "Mirror copies of the FAT do not match. Volume SYS not mounted"

    Windows NT:
    The system will indicate file corruption errors when cold-booting.
    Pressing the  button allows the system to boot into NT.

    OS/2
    System hangs at boot to hard drive reporting errors such as
    "OS/2 kernal NOT ACCEPTABLE"

    CAUSE

    SX4000 boards that have the DPT10003C BIFIFO II at IC locations U3 and U4
    (on the SX4000 Module board) are out of spec.  DPT is changing the PLD
    (Programmable Logic Device) at IC location U9 on the SX4000 board.
    The old PLD is a XILINX device identified by the code 383J.  The corrected
    part will be identified by the code 383L at location U9.
    (This is a surface mount PLD)

    SYSTEMS AFFECTED

    All Manhattan P, V, and G systems with the Disk Array Option.

    COMPONENTS AFFECTED
    AST PART NUMBER AND DESCRIPTION

    234067-001        DPT PM3224 2 CH PCI DISK ARRAY CONTROLLER

    SOLUTION

    Replace
    AST P/N 234067-001 DPT PM3224 controller
    with
    AST P/N 234067-002 DPT PM3224 controller

    or

    Replace the SX4000 Module with

    AST P/N 234348-001 PCBA DBD DUAL CHAN DSK ARRAY

    To obtain the new part, contact a local AST Authorized Service Center.