                                                             Last Revised
    AST RESEARCH, INC.        TECHNICAL BULLETIN # 1733          06/25/97

    TITLE:  Mylex DAC960PL and Manhattan S Server

    ISSUE

       When a Mylex PCI DAC960PL Raid Controller is installed in a
       Manhattan S series server running Windows NT, the operating
       system will not see the second CPU. During the installation
       process, the system will be identified as a standard PC instead
       of the multiprocessor MPS system required for Windows NT to
       recognize dual processors.
       The Mylex 3.x firmware maps itself into a reserved memory space
       used by the AMI BIOS, causing improper identification.

       This issue affects the following systems : 501832, 503076,
       503281, and 503282.

    BACKGROUND

       N/A

    ACTION

       Contact Mylex at (510) 608-2400 to obtain firmware version 2.38
       as an interim fix. This firmware version is a single chip
       replacement that  does not exhibit the reserved memory problem.

       WARNING: AST highly recommends that the user back up all system
       drives prior to upgrading the MYLEX BIOS and firmware.

    NOTES

       Mylex is currently working on a fix to the 3.X firmware.

       Contact Mylex for firmware replacement procedures and further
       updates on issue.

    TAN 000510DG

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