Olivetti M386/25

Machine type XP 2670
Serial 0028683
Manufacturer Olivetti, made in Italy
Preloaded software MS-DOS 4.01 and Windows 3.0 or OS/2 1.2
Date October(?) 1991

Physical description

Type Desktop
Dimensions (HxWxD) 155 x 420 x 405 mm
Drive bays 4 x 3.5" (two may be converted into one 5.25" half-height), all accessible
Power supply 200-220VAC, 1A (dated 02/91)

Main board

Manufacturer Olivetti, model BA247 (07/90 on sticker)
BIOS Olivetti, vers. 1.09, June 26, 1991 (50 Kb)
Chipset Olivetti
Processor Intel 80386DX-25 MHz (32-bit) PGA
Coprocessor Intel 80387DX-25 MHz, PGA ADDITION, socket for optional Weitek coprocessor (*)
External cache 32 Kb 25ns
Cache Controller Intel 82385-25
Memory 2 Mb, 80ns on board, plus 8 sockets for 80ns, 30-pin SIMMs (to be installed in groups of four)
Max memory 18 Mb (2 Mb on board + 16 x 1 Mb SIMMs, incl. memory card) (**)
Bus ISA 16-bit
Expansion slots 5 x 16-bit ISA (all available), slot for additional memory card (32-bit proprietary)
Interface FDD (2 units), IDE HDD (2 units)
Video Integrated Chips & Technologies VGA-plus adapter
Ports PS/2 keyboard, PS/2 mouse, serial (UART 16550A), parallel, VGA


Installed RAM 8 x 1 Mb 70ns SIMMs (four w. 15/2/94 sticker, four dated 94), total mem. 10 Mb
Ethernet SMC WD8013EP (9120 on chips) ADDITION


Diskette drive 1.44 Mb, 3.5" slim-size (Sony MFD-17W, 9108)
Hard disk Conner CP30104 (100 Mb), IDE/ATA, 3.5" half-height (9139)


Acquisition May 0'3, paid a couple $
Condition Very good, working, no missing parts
Installed sw MS-DOS 6.20, MS Windows f.W. 3.11, NetWare 2.20
Repairs/modifications Added 4 x 1 Mb memory SIMMs (it had 6 Mb only)
Current status All hw working
Current O.S. None
Spare parts Parts and accessories from other Olivetti PCs (P750, P800)


(*) Two sockets for optional coprocessors are featured, allowing either an 80387 or a Weitek 3167 to be installed.

(**) Apparently, this system supports a maximum of 15 Mb (see my experiences with this M386/25).


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This page was first published on the web on May 26, 2003
Last revised May 25, 2004