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IBM Personal System/2 Model 40 SX


Machine type 8540-045
Serial 55-MXT77
Manufacturer IBM Corp., United Kingdom
FCC ID ANO8540
Date September 1991

Physical description

Type Desktop (may be converted to Floor standing) (11 SEP 1991 print inside top cvr, 7 AUG 1991 print on drives tray, cables 10/91 or 11/91)
Dimensions (HxWxD) 169 x 440 x 394 mm
Weight 12.6 Kg
Drive bays 1 x 3.5", 3 x 5.25", all accessible
Power supply 197 W, 110/220VAC switchable (9135)

Main board

BIOS IBM, Sept. 23, 1991 (26 Kb)
Clock 20 Mhz, 0-2 wait states
Processor Intel 80386SX (32-bit) PQFP
Coprocessor Socket for optional i80387
Memory 3 sockets for 85ns 72-pin SIMMs (PS/2 type), parity checked (accept faster 70ns SIMMs)
Max on system board 16 Mb (about 15,5 Mb usable)
Bus AT 16-bit 
Expansion slots 5 (AT 16-bit), on riser card
Video Integrated 16-bit VGA display adapter
Interface HDD (2 units type IDE/ATAPI), FDD (2 units)
Ports PS/2 keyboard, PS/2 mouse, serial (UART 16450), parallel, VGA

Cards

Installed RAM 3 x 4 Mb 70ns SIMMs (two have 92-14)
Ethernet SMC 8003EP (03-93) ADDITION

Storage

Diskette drive 1.44Mb, 3.5" slim (Alps DFP723, 91-15)
Hard disk Maxtor 7080AI (80 Mb) IDE/ATA, 3.5" slim (28 JUL 1991)

Trivia

Acquisition Mid-98, collected in a dump together w. other appliances (incl. another PS/2 40 which was demolished to get spare parts)
Condition Very good
Installed O.S. IBM PC-DOS 5.00 (Italian)
Modifications Added one memory SIMM and ethernet card
Current status All hw working
Spare parts Almost everything, incl. drives, planar, etc.

Peripherals: KEYBOARDS, MONITORS, MICES, PRINTERS


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This page was first published on the web on Nov. 11, 2001
Last revised May 24, 2004
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