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    AST RESEARCH, INC.         TECHNICAL BULLETIN # 1115                3-27-95

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    			    BRAVO MS P/90 MEMORY ERROR WITH IBM SIMMS

    PROBLEM

    When booting DOS 6.2X on a Bravo MS P/90 (or any other system with motherboard
    part number 202654-XXX) and running HIMEM.SYS, the following error message may
    be displayed:

    	"ERROR: HIMEM.SYS has detected unreliable extended memory at
    	 address XXXXXXXXh."

    (The XXXXXXXXh indicates a memory address that may vary between systems.)

    CAUSE

    HIMEM.SYS fails on the Bravo MS P/90 system with some models of IBM SIMMs.

    SYSTEMS AFFECTED
    AST PART NUMBER AND DESCRIPTION

    Any desktop system with motherboard part number 202654-XXX.

    SOLUTION

    If the system is using IBM SIMMs with part number IBM11D1320BB-70
    (AST P/N 104000-238), these SIMMs are not compatible with the Bravo MS P/90
    and other systems using the above mentioned motherboard part number, and
    should be replaced.

    Order AST part number 104000-189 by calling AST Spare Parts Sales at
    (800) 727-2787.

    Note: Other IBM SIMMs with the IBM part number IBMXXXXXXXBB-XX may also be
    incompatible.