IBM PS/1 User Manual

Cache memory jumpers are preset at the factory for 128K cache memory.
Reset the jumpers for 256K by moving them forward to cover two jumper
pins, as shown in Figure 4-15.
Jumpers
Jumper
Pins
Bank 1
Tag
Bank 2
Notch
(Insert modules like this.)
(Move jumpers like this.)
Cache Memory Sockets
Memory
Module
Socket
Cache
Memory
Module
Figure 4-15. 486SX, 486DX, and 486DX2 (72-Pin Memory SIMM) System
Boards
Note: Not all system boards have cache memory sockets. Some have 1
bank while others have 2 banks of cache memory.
Repair Information 4-19

IBM PS/1 Specifications

General

Processor	Intel 80286 or 80386
Processor Speed	10 MHz (80286)
RAM	1 MB (expandable to 2 MB or more)
Storage	40 MB hard drive
Floppy Drive	3.5" 1.44 MB
Graphics	VGA
Ports	Serial, Parallel, Mouse