IBM PS/1 User Manual

486DX 33MHz (30-Pin Memory SIMM) System Board
Layout
Note: Jumpers are marked in black and should be in positions as shown.
J2 External Battery
J3 Power
J6 Diskette
J7 Parallel Port
Comm A Serial Port
Comm B Serial Port
J8 Hard Disk
J9 Keyboard
J10 Mouse
J11 Hard Disk LED (pin 4 and 5)
Power On LED (pin 1 and 2)
J12 Riser
J15 Video Feature
J16 Display/Signal
J45 30-Pin Memory SIMM Socket Bank 0, 0
J46 30-Pin Memory SIMM Socket Bank 0, 1
J47 30-Pin Memory SIMM Socket Bank 0, 2
J48 30-Pin Memory SIMM Socket Bank 0, 3
J49 30-Pin Memory SIMM Socket Bank 1, 0
J50 30-Pin Memory SIMM Socket Bank 1, 1
J51 30-Pin Memory SIMM Socket Bank 1, 2
J52 30-Pin Memory SIMM Socket Bank 1, 3
JP4 BIOS Select
JP7 Reset Switch
JP8 Battery Select
JP10 VGA Enable
JP20 Beeper Enable
JP200 Cache Configuration
JP201 Cache Configuration
JP206 Cache Configuration
JP207 Cache Configuration
JP209 Mouse Enable
JP300 Processor Type
JP305 IRQ9
U300 486DX Processor
Parts/Test Point Locations
5-13

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