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IBM Personal System/2 Model 55 SX


Machine type 8555-031
Serial 55-F6621
Manufacturer IBM Corp., United Kingdom
Date October 1989

Physical description

Type Desktop
Dimensions (HxWxD) 102 x 406 x 397 mm
Weight 8.65 Kg
Drive bays 2 x 3.5" half-height, both accessible
Power supply 90 W, 110-220VAC (DATE 9216) REPLACEMENT

Main board

Manufacturer IBM (chips 8943 or earlier), planar id FBFF
BIOS IBM, Nov. 2, 1988 (24/10/89 sticker)
Processor Intel 80386SX-16MHz (32-bit), PQFP
Coprocessor Socket for optional i80387SX Math coprocessor
Memory 2 sockets for 85ns 72-pin SIMMs (PS/2 type), parity checked (*)
Max on system board 8 Mb (2 x 4 Mb)
Max. using adapter cards 16 Mb (about 15,5 Mb usable)
Bus Micro channel (MCA) 16-bit
Expansion slots 3 (16-bit, one w. video ext.)
Video Integrated 16-bit VGA display adapter (256 Kb, max. 320x200, 256 colours or 640x480, 16 colours)
Interface HDD (2 units type ST-506), FDD (2 units)
Ports PS/2 keyboard, PS/2 mouse, serial (UART 16550), parallel, VGA

Cards

Installed RAM 2 x 4 Mb 80ns SIMMs (one has 9051)

Storage

Diskette drive 1.44 Mb, 3.5" slim (Ye-Data YD-701, 89-32)
Hard disk Model WDL-330R (30 Mb), 3.5" slim (8943 on connect.)

Trivia

Acquisition Mid-2000, gift
Condition Very good
Installed O.S. IBM PC-DOS 5.0 (Italian)
Repairs/modifications Replaced 2 Mb memory SIMM with 2 x 4 Mb SIMMs
Current status All hw working
Spare parts Almost everything, incl. drives, planar, etc.

Notes

(*) 80ns SIMMs OK, does not accept 70ns SIMMs.


Peripherals: KEYBOARDS, MONITORS, MICES, PRINTERS


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This page was first published on the web on Nov. 11, 2001
Last revised Oct. 22, 2004
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