Olivetti M386/25

Machine type XP 2670
Serial 0019969
Manufacturer Olivetti, made in Italy
Preloaded software MS-DOS 4.01 and Windows 3.0 or OS/2 1.2
Date February 1991

Physical description

Type Desktop (rev. of front panel 2/91)
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
BIOS Olivetti, vers. 1.08, Nov. 19, 1990
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 SIMMs, four 80ns (9140), four 70ns (9302) (total mem. 10 Mb)
Controller Farp Host6P.02 IDE adapter (mid-92) ADDITION (***)


Diskette drive 1.44 Mb, 3.5" slim-size (Sony MFD-17W, 9009)
2nd Diskette drive 1.2 Mb, 5.25" half-size (Panasonic JU-475) ADDITION
Hard disk Conner CP30126 (120 Mb), IDE/ATA, 3.5" half-height (9151) REPLACEMENT (****)


Acquisition Mar. 2001, paid a couple $
Condition Very good, working
Installed sw None
Repairs/modifications Added second diskette drive (replacing non-functioning tape streamer) and 4 x 1 Mb memory SIMMs (it had 6 Mb only)
Current status All hw working
Current O.S. Olivetti MS-DOS 5.00, MS Windows 3.0 (Italian)
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.

(**) An additional memory card, supporting 8 more 30-pin SIMMs, can be added. Despite many efforts, I was never able to use more than 15 Mb on this machine. If 16 Mb (16 x 1 Mb SIMMs) are installed, the last four SIMMs will not be"viewed" (BIOS reports 14 Mb instead of 18). Instead, a 12 x 1 Mb + 4 x 256 Kb combination (tot. 15 Mb) can be correctly configured.

(***) This additional controller is required to use the installed 120 Mb HDD unit as integrated IDE interface only supports twenty specific HD types, and no "user" type can be configured.

(****) Original HDD was either a 40 Mb, a 200 Mb or, most likely, a 100 Mb unit (the latter was the most common).


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This page was first published on the web on Nov. 11, 2001
Last revised May 25, 2004