Olivetti SX-20

Machine type BU 386 SX-XX
Serial 6832219
Manufacturer Olivetti (made in Italy)
Date May 1992

Physical description

Type Desktop
Dimensions (HxWxD) 95 x 356 x 375 mm
Drive bays 2 x 3,5", 1 x 5.25" half-height, all accessible
Power supply 200-220VAC, 1A (05/92)

Main board

Manufacturer Olivetti (10/91 on riser card)
BIOS Olivetti resident diagnostics, rev. 1.15 (21 May 1991)
Processor AMD Am386SX-20 MHz (32-bit) PQFP
Coprocessor Socket for 80387SX coprocessor
External cache 32 Kb (Intel 82385SX-20 contrl.)
Memory 1 Mb, 80ns (12 chips), 4 sockets for 80ns 30-pin SIMMs (to be installed in pairs)
Max on system board 17 Mb (w. 4 x 4 Mb SIMMs), about 16 Mb useable
Bus ISA 16-bit
Expansion slots 3 x 16-bit (all available)
Interface FDD (2 units), HDD (IDE, 2 units)
Video Integrated WDC 90C11 VGA adapter w. 256 Kb of memory (upgradeable to 512 Kb)
Ports PS/2 keyboard, PS/2 mouse, serial (UART 16450), parallel, VGA


Installed RAM 2 x 1 Mb 70ns, 2 x 1 Mb 80ns SIMMs (all und.)
Ethernet (Unkn., p/n 142640-402) (9322 printed on card)


Diskette drive 1.44 Mb, 3.5" slim-size (Sony MFD-17W-86, 9203)
Hard disk Western Digital Caviar 2120 (120 Mb), IDE/ATA, 3.5" half-height (31 MAR 92)


Acquisition Apr. '03, gift
Condition Very good, working
Installed O.S. MS-DOS 6.22a, MS Windows 3.11 (Italian)
Repairs/modifications Added 2 x 1 Mb memory SIMMs
Current status All hw working
Current O.S. None
Spare parts Floppy drive, accessories


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This page was first published on the web on Apr. 20, 2003
Last revised May 25, 2004