IBM Personal System/2 Model 90 XP 486

Type 8590-AH9
Serial 55-0Z5L0
Manufacturer IBM United Kingdom Ltd.
FCC ID AN08590B25
Pre-loaded software IBM OS/2 2.0
Date July 1992

Physical description

Type Desktop
Dimensions (HxWxD) 140 x 440 x 430 mm
Weight 11.4 Kg
Drive bays 3 x 3.5" half-height, 1 x 5.25" half-height (all accessible)
Power supply 194 W, 110-220VAC manual voltage switch (dated 9227)

Main board

Chipset/Manufacturer IBM (planar id FF6F)
Bus Micro Channel (MCA) 32-bit
Expansion slots 4 x 32-bit MCA (1 w. video ext., 3 available), one 64-bit for processor complex (proprietary), two 64-bit for memory cards (proprietary)
Interface FDD (2 units)
Video Integrated 16-bit XGA display adapter (1024x768, 16 colours; 640x480, 256 colours)
Ports PS/2 keyboard, PS/2 mouse, 2 buffered serial (UART 16550A), parallel, XGA


Type Type-1 complex (*)
BIOS IBM, 25 Feb. 1992 (sticker on BIOS chip 22/07/92)
Processor Intel 80486SX-25MHz (32-bit) PGA
Coprocessor Socket for i80487DX
Ext. Cache Optional 256 Kb cache card
Max Memory 64 Mb (8 x 8 Mb) (*)
Memory 2 memory riser cards (dated 9229) - each card features 4 sockets for 70ns 72-pin SIMMs, parity checked (PS/2 proprietary) (**)
Installed RAM 24 Mb 70ns on riser cards (4 x 4 Mb SIMMs type 71F7010, 4 x 2 Mb type 87F5041, all und.)
SCSI Controller IBM 32-bit PS/2 bus master SCSI adapter/A w. 512 Kb cache (id 8EFF) (sticker 15/07/92)


Diskette drive 1.44 Mb, 3.5" slim-height (Alps DFP723, 92-16)
Hard disk Model WDS-3160 (160 Mb) SCSI, 3.5" half-height


Acquisition May 2000, bought for a few $ together w. some other appliances, including PS/2 system units and 8514 monitors
Condition Very good, working
Installed sw IBM OS/2 Warp 3.0 (Italian)
Repairs/modifications Removed token-ring adapter, added 4 x 2 Mb memory SIMMs (it had 16 Mb only)
Current status All hw working
Current O.S. IBM PC-DOS 5.02 (Italian)
Spare parts Almost everything: drives, power supply, etc.


(*) Existing processor complex can be changed with a newer one (Type-2, 3, or 4, CPUs up to Pentium-90), supporting up to 256 Mb of RAM.

(**) Slower 80ns SIMMs can be used instead. With a Type-1 complex SIMMs must be installed in pairs.


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This page was first published on the web on Nov. 11, 2001
Last revised Oct. 26, 2004