IBM Personal System/2 Model 35 SX

Machine type 8535-043
Serial 55-HAPD4
Manufacturer IBM Corp., United Kingdom
Date July 1991

Physical description

Type Desktop
Dimensions (HxWxD) 113 x 360 x 414 mm
Weight 10.8 Kg
Drive bays 1 x 5.25" slim, 1 x 5.25" half-height, both accessible
Power supply 118 W, 110/220VAC switchable (WK. 24/91)

Main board

BIOS IBM, Mar. 15, 1991 (sticker 15/04/91)
Clock 20 Mhz, 0-2 wait states
Processor Intel 80386SX (32-bit) PQFP
Coprocessor Intel i80387SX-20 math coprocessor
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 3 (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


Installed RAM 3 x 4 Mb 70ns SIMMs on planar (und.)
Ethernet Intel 8/16 LAN Adapter (16-bit ISA, 2493) ADDITION
Audio MediaVision IXW650 (8-bit ISA, 91 40) ADDITION


Diskette drive 1.44Mb, 3.5" slim (Alps DFR723, 92-03) REPLACEMENT
Hard disk Maxtor 7040AI (40 Mb) IDE/ATA, 3.5" slim (19 JUN 1991) REPLACEMENT (replaces identical unit)


Acquisition Oct. '02, paid about 20$
Condition Very good, but it had no drives nor memory
Repairs/modifications Added FDD, HDD and memory SIMMs
Current status Complete, all hw working
Current O.S. IBM PC-DOS 5.00 (Italian)
Spare parts Drives, planar, power supply, etc.


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This page was first published on the web on Dec. 26, 2002
Last revised May 24, 2004