    AST RESEARCH, INC.         TECHNICAL BULLETIN #0641                  11-08-90

                            NEW 386SX/16 PROCESSOR BOARD

    The following information summarizes a compatibility problem with the new
    386SX/16 processor board (part number 202380-001) and Cupid motherboards.
    This new board replaces the original 386SX/16 processor board (part number
    202337-001) and will be shipped with the Cupid enhanced motherboard in all
    Premium 386SX/16 systems.

    PROBLEM:

    The new 386SX/16 processor board (part number 202380-001) is not compatible
    with common Cupid motherboards using BIOS v1.01.  System lock-ups occur when
    attempting to change the processor speed.  The problem occurs when using
    either the keyboard method    or the SPEED.COM program.
    Lock-ups also occur during the processor speed change test when running the
    confidence tests.

    RESOLUTION:

    In order to resolve the problem, a BIOS upgrade (from version 1.10 to 1.20)
    on the Cupid motherboard is necessary.  This can be accomplished by using a
    Cupid BIOS upgrade kit (part number 500775-001).

    Listed below are the part numbers for the motherboards which require BIOS
    upgrades:

         202356-001 rev F    202273-001 rev N
         202356-002 rev D    202273-002 rev J
         202356-003 rev D    202273-003 rev F
         202356-004 rev D