IBM PS/1 User Manual

486SX 25MHz Level 2 (30-Pin Memory SIMM) System
Board Layout
Note: Jumpers are marked in black and should be in positions as shown.
J2 External Battery
CN2 Power
J15 Diskette
J30 Parallel Port
J16 Hard Disk
Comm A Serial Port
Comm B Serial Port
CONN2 Keyboard
CONN1 Mouse
J11 Hard Disk LED (pin 4 and 5)
Power On LED (pin 1 and 2)
J12 Riser
J13 Video Feature
J14 Display/Signal
SIMM1 30-Pin Memory SIMM Socket Bank 0, 0
SIMM2 30-Pin Memory SIMM Socket Bank 0, 1
SIMM3 30-Pin Memory SIMM Socket Bank 0, 2
SIMM4 30-Pin Memory SIMM Socket Bank 0, 3
SIMM5 30-Pin Memory SIMM Socket Bank 1, 0
SIMM6 30-Pin Memory SIMM Socket Bank 1, 1
SIMM7 30-Pin Memory SIMM Socket Bank 1, 2
SIMM8 30-Pin Memory SIMM Socket Bank 1, 3
JP7 Reset Switch
JP8 Battery Select
JP10 VGA Enable
JP16 PCK Enable
JP61 CPU Select
JP9 CPU Select
JP24 Mouse Enable
JP26 Beeper Enable
U29 Video RAM Socket
U30 Video RAM Socket
U31 Video RAM Socket
U32 Video RAM Socket
U11 486SX Processor
U214 Math Coprocessor Socket
Parts/Test Point Locations
5-11

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