IBM Personal System/2 Model 55 SX

Machine Type 8555-041
Serial 55-KADC1
Manufacturer IBM Corp., United Kingdom
Date February 1992

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 (DAT.: 06/92)

Main board

Manufacturer IBM (chips 9151), planar id FBFF
BIOS IBM, Nov. 2, 1988 (128 Kb)
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.)
Interface HDD (ESDI), FDD
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 16550A), parallel, VGA


Installed RAM 2 x 4 Mb 80ns SIMMs (one 9134 on chips and another 3691 on card)


Diskette drive 1.44 Mb, 3.5" slim (Alps DFR723, 91-52)
Hard disk Model WD-3158 (120 Mb), 3.5" half-height (cables WK 47:91) UPGRADE (**)


Acquisition Mid-98, paid ca. 25$ together w. 8515 monitor, keyboard, mouse, manual & ref. disk
Condition Very good, working
Installed O.S. IBM PC-DOS 7.00, MS Windows 3.1 (Italian)
Repairs/modifications Removed 3270 emulation card
Current status All hw working
Current O.S. IBM PC-DOS 5.0 (Italian)
Spare parts Almost everything, incl. drives, planar, etc.


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

(**) Replaces original 40 Mb unit.


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