============================================================================= AST RESEARCH, INC. TECHNICAL BULLETIN #0736 01-21-92 ============================================================================= 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.