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AST RESEARCH, INC. TECHNICAL BULLETIN #0641 11-08-90
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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 <Ctrl> <Alt> <Up Arrow> 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