    AST RESEARCH, INC.        TECHNICAL BULLETIN # 1677          04/08/97

    TITLE:  Manhattan S/CP CPU Stepping Issues

    ISSUE

       The Pentium Pro B-1 CPU stepping may cause the system to
       intermittently hang or reboot when using BIOS v3.50 or older.

       This issue affects the following Manhattan S and Commerce Pro
       systems: 503076 and 501832.

    BACKGROUND

       N/A

    ACTION

       The CPU stepping can be identified by the last five digits of the
       part number stamped on the bottom of the CPU. Use the following
       list to identify the  CPU Stepping.

          KB80521EX200256SY013 = A1 stepping
          KB80521EX200256SY032 = A1 stepping
          KB80521EX200256SY040 = A1 stepping

          KB80521EX200256SL22T = B1 stepping
          KB80521EX200256SL22V = B1 stepping

       If the system contains a B1 stepping CPU, update the system BIOS
       to version 3.60 (AST part number 905573-037) or later.

       File 05573037.EXE is available from one of the following AST
       On-Line! services:

          AST WWW Site:  http://www.ast.com
          AST On-Line! BBS*:  See IB0001.TXT
          CompuServe:  GO: ASTFORUM
          Prodigy:   JUMP: ASTSUPPORT

          * Refer to IB0001.TXT for a list of AST's
            international BBS numbers.

       To decompress this file, create a temporary directory on your
       hard drive, copy the downloaded file to that directory, and run
       the file.

       For further BIOS information, refer to Software Bulletin # 0305
       on any of AST's On-Line! services.

    NOTES

       N/A

    TAN N/A

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