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AST RESEARCH, INC. TECHNICAL BULLETIN #0736 01-21-92
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PREMIUM 486/25 AND IMSI PET MOUSE
PROBLEM: When using a Pet Mouse, a PS/2 compatible mouse manufactured
by Imsi on a Premium 486-25 the following errors will occur:
- The system will lock up with the Pet Mouse plugged into the
mouse port (motherboard part number 202360-001).
- If the system passes its POST test the Pet Mouse will be
recognized as a serial mouse connect to COM1: IRQ: 4 I/O:
3F8, instead of a PS/2 mouse.
CAUSE: The cause of this problem is the keyboard controller revision
1.01, which is located at U15.
SYSTEM
AFFECTED: All systems that have motherboard part number 202360-001.
SOLUTION: This problem is resolved by replacing the revision 1.01
keyboard controller with revision 1.02. This keyboard
controller (part number 237002-002) can be ordered through
AST's Product Support Department.