IBM PS/1 User Manual

Pin Signal Name I/O Pin Signal Name I/O
41 BCAS2 I 57 SIMMD12 I/O
42 BCAS3 I 58 SIMMD12 I/O
43 BCAS1 I 59 +5 V dc I
44 RAS4 I 60 SIMMD13 I/O
45 RAS5 I 61 SIMMD13 I/O
46 BS1 I 62 SIMMD14 I/O
47 AWE I 63 SIMMD14 I/O
48 Open 64 SIMMD15 I/O
49 SIMMD8 I/O 65 SIMMD15 I/O
50 SIMMD8 I/O 66 BS2 I
51 SIMMD9 I/O 67 PD1 O
52 SIMMD9 I/O 68 PD2 O
53 SIMMD10 I/O 69 PD3 O
54 SIMMD10 I/O 70 PD4 I
55 SIMMD11 I/O 71 BS3 I
56 SIMMD11 I/O 72 Ground
Parts/Test Point Locations 5-31

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