                                                             Last Revised
    AST RESEARCH, INC.        TECHNICAL BULLETIN # 1765          10/07/97

    TITLE:  Manhattan and Dual Processors

    ISSUE

       Due to the limited availability of the Intel Pentium 90Mhz
       processors, Manhattan P & V 5090 customers may be unable to
       upgrade their systems to a dual processor configuration.

       This issue affects the following systems: 501500 and 501502.

    BACKGROUND

       N/A

    ACTION

       Upgrade the secondary processor to an  Intel Pentium 100Mhz
       processor (CPU marking sx963, stepping C2).

    NOTES

       The Manhattan 5090 P & V processor boards are hard-wired to the
       proper external frequency required by a Pentium 90Mhz processor.
       Using a Pentium processor of greater speed will provide a
       functional dual processor configuration running at the Pentium 90
       specification. AST does not support modifying the processor board
       to a faster processor speed.

       Several different versions or "steppings" of Pentium CPUs are
       available. Manhattan P and V servers must use the proper
       combination of these CPUs in order to function properly.  Refer
       to IB # 0019 for a list of CPU stepping configurations.

       Some symptoms of dual processor incompatibility are:  When
       installing a second CPU in a Manhattan P/V system, the customer
       may experience a problem booting or the second processor will not
       be recognized by an operating system such as a Windows NT server
       3.51.

       Contact AST's Technical Support at (800) 727-1278 to verify that
       the processor board in your system is at the correct revision
       level to support dual processors.

       For additional information on dual processor configurations, see
       Technical Bulletin #s 1286.

    TAN PRJ 2400MW

    ---------------------------------------------------------------------
    The information in this data sheet is subject to change without
    notice. AST Research, Inc. shall not be liable for technical or
    editorial errors or omissions contained herein; nor for incidental or
    consequential damages resulting from the furnishing, performance,
    or use of this material. This material contains information protected
    by copyright. No part of this material may be reproduced in any form
    without prior written consent from AST Research, Inc.
    All rights reserved.
    ---------------------------------------------------------------------
    Template Rev 02