Olivetti M480-50

Type 9590-ALA
Serial 55-0M7Z3
Manufacturer IBM Corp., United Kingdom Ltd. (*)
FCC ID AN09590C50
Date July 1993

Physical description

Type Desktop
Dimensions (HxWxD) 140 x 440 x 430 mm
Weight 11.4 Kg
Drive bays 3 x 3.5" half-height, 1 x 5.25" half-height (all accessible)
Power supply 194 W, 110-220VAC manual voltage switch (9328)

Main board

Chipset/Manufacturer IBM (planar id FF6F)
Bus Micro Channel (MCA) 32-bit
Expansion slots 4 x 32-bit (1 w. video ext., 2 available), one 64-bit for processor complex (proprietary), two 64-bit for memory cards (proprietary)
Interface FDD (2 units)
Video Integrated 16-bit XGA display adapter (1024x768, 16 colours; 640x480, 256 colours)
Ports PS/2 keyboard, PS/2 mouse, 2 buffered serial (UART 16550A), parallel, XGA


Type Type-2 complex (**)
BIOS IBM, Nov. 2, 1992 (sticker on BIOS chip 15/06/93)
Processor Intel 80486DX2-50 MHz (32-bit) PGA
Coprocessor Integraded on 486DX
Ext. Cache N/a
Max Memory 64 Mb (8 x 8 Mb) (**)
Memory 2 memory riser cards (dated 9322) - each features 4 sockets for 70ns 72-pin SIMMs, parity checked (PS/2 proprietary) (***)
Installed RAM 32 Mb 70ns (4 x 4 Mb SIMMs type 31F2314, 2 x 8 Mb type 78G9177, und.) on riser cards
SCSI Controller IBM 32-bit PS/2 bus master SCSI adapter/A with 512 Kb cache (id 8EFF) (sticker 17/06/93, cables 12/7/93)
Video IBM 32-bit XGA-2 adapter (id 8FDA) (sticker 090393)


Diskette drive 2.88 Mb, 3.5" slim-height (Mitsubishi MF356C, MAY 1993)
Hard disk IBM WDS-3200 (200 Mb), SCSI, 3.5" slim-height
2nd Hard disk IBM DSAS-3360 (364 Mb), SCSI, 3.5" slim-height ADDITION


Acquisition Mid-99, collected in a dump together w. a CDU 1548 monitor, keyboard and mouse
Condition Very good, working
Installed sw. IBM PC-DOS 5.00, MS Windows for Workgroup 3.11 (Italian)
Modifications Removed token-ring adapter, added second hard drive, added 2 x 8 Mb memory SIMMs (it had 16 Mb only)
Current status All hw working
Current O.S. DR DOS 6.0, MS Windows for Workgroup 3.11 (Italian)
Spare parts Almost everything, incl. drives, planar, etc.


(*) This machine is in fact an IBM Enhanced Personal System/2 Model 90 XP 486.

(**) Existing processor complex can be changed with a newer one (Type-3 or 4, CPUs up to Pentium-90, supporting up to 256 Mb of RAM).

(***) Slower 80ns SIMMs can be used instead. Using a Type-2 processor complex SIMMs need not to be installed in pairs.


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