IBM Personal System/2 Model 70 386

Machine Type 8570-121
Serial 55-AX682
Manufacturer IBM Corp., United Kingdom
Date January 1990

Physical description

Type Desktop (FD panel, dated 16 NOV 1989, is probably from a different machine)
Dimensions (HxWxD) 140 x 360 x 420 mm
Weight 9.5 Kg
Drive bays 2 x 3.5" half-height (accessible), 1 x 3.5 or 5.25" half-height (internal)
Power supply 132 W, 90-137/180-265 VAC auto sense (9004)

Main board

BIOS IBM, Dec. 15, 1989 (128 Kb, planar id F3FF, model F804)
Processor Intel 80386-20MHz (32-bit), PGA
Coprocessor Intel 80387-20 MHz, PGA ADDITION
Memory 3 sockets for 85ns 72-pin SIMMs (PS/2 type), parity checked
Max on system board 6 Mb (3 x 2 Mb - only accepts 2 Mb SIMMs)
Max. using adapter cards 16 Mb
Bus Micro Channel (MCA) 32-bit
Expansion slots 3 (2 x 32-bit; 1 x 16-bit w. video ext.)
Interface ESDI HDD(1 unit), FDD (2 units)
Video Integrated 16-bit VGA display adapter (256 Kb, max. 320x200, 256 colours or 640x480, 16 colours)
Ports PS/2 keyboard, PS/2 mouse, serial (UART 16550), parallel, VGA


Installed RAM 3 x 2 Mb 80ns SIMMs (89-40, 89-41 and 89-49)


Diskette drive 1.44 Mb, 3.5" half-height (Mitsubishi MF355C, DEC. 1989)
Hard disk Model WD-3158 (120 Mb), 3.5" half-height


Acquisition Summer 2000, gift
Condition Very good, working
Installed O.S. IBM PC-DOS 5.02 (Italian)
Repairs/modifications Removed 3270 emulation card, added one 2 Mb memory SIMM
Current status All hw working
Spare parts Drives, power supply, accessories


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This page was first published on the web on Nov. 11, 2001
Last revised Oct. 21, 2004