IBM Personal System/2 Model 70 386

Machine Type 8570-A21
Serial 55-AKA57
Manufacturer IBM Corp., United Kingdom
Date September 1989

Physical description

Type Desktop (24 AUG 1989 print on rev. of FD panel)
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 (8938)

Main board

BIOS IBM, Feb. 20, 1989 (128Kb, planar id F9FF, model F80D)
Processor Intel 80386-25 MHz (32-bit) PGA
Coprocessor Intel 80387-25 MHz, PGA ADDITION
Cache 64 Kb 30ns
Cache Controller Intel 82385
Memory 4 sockets for 80ns 72-pin SIMMs (PS/2 type), parity checked (also accept faster 70ns SIMMs)
Max on system board 8 Mb (4 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 res. 320x200, 256 colours or 640x480, 16 colours)
Ports PS/2 keyboard, PS/2 mouse, buffered serial, parallel, VGA


Installed RAM 4 x 2 Mb, 70ns SIMMs (two 37-89)


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


Acquisition Summer 98, paid a few $ together w. other appliances
Condition Very good, setup needed
Installed O.S. IBM OS/2 2.1 (Italian), hardly booting
Repairs/modifications Removed 3270 emulation card, replaced battery
Current status All hw working
Current O.S. IBM DOS 5.0 (Italian)
Spare parts Almost everything, incl. drives, planar, etc.


I also tested this machine with a IBM Blue Lightning upgrade (486DLC2-66 MHz w. 16 Kb internal cache).


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