In 1972, Olivetti established in the U.S.A. (Cupertino), the Advanced Technology Centre (ATC), a research centre specialized in new technologies and office automation equipment design. During ten years the centre designed Olivetti typewriters, calculators, photocopiers, etc.... In 1980, the first Olivetti computer took form in Cupertino, and the M-20 computer was launched in March 1982. More than 50,000 units are estimated to have been shipped in the first year.
The M20 was one of the very rare computers based on the Zilog Z8000, a 16 bits microprocessor very close to its 8 bits big brother the Z80. Like most of the computers designed before the IBM PC era, the M20 offered technical choices which made it totally incompatible with the rest of the micro world.
The first proprietary M20 operating system, called PCOS (Professional Computer Operating System) was also very particular and didn't allowed files to be exchanged with other systems. Hopefully, MS-DOS V2.0, CP/M-86 and CP/M-80 would be later adapted to the specific M-20 hardware. Moreover, front of this compatibility problem, Olivetti developped a coprocessor board based on the 8086 chip, which offered M20 owners access to IBM PC software.
The M20 came with a 12'' monochrome or colour custom built monitor. The international version had a grey plastic case, the Italian version had a brown one.
Hello, I have a M20 with several floppies, running PCOS. I have found user manuals on the Internet, but it would be cool to obtain more detailed informations regarding this computer. In particular, I am interested in how to access low level system calls in Basic, or developing small assembler routines. Best regards
Hello, I have an M20 with a few floppies, with PCOS and some programs. I have a thermal printer from olivetti too... Because lack of documentation I know very little about PCOS and the computer itself. I'm searching any type of documentation about PCOS, programs for it and MS-DOS 2 version adapted for M20 hardware.
Best Regards
Tuesday 26th November 2002
Alejandro Corral (Granada, Spain)
NAME
M20
MANUFACTURER
Olivetti
TYPE
Professional Computer
ORIGIN
Italy
YEAR
March 1982
BUILT IN LANGUAGE
None
KEYBOARD
Full-Stroke 120 keys with numeric keypad
CPU
Zilog Z8001
SPEED
4 Mhz
CO-PROCESSOR
None
RAM
128 KB expandable to 512 KB
ROM
12 KB (BIOS)
TEXT MODES
80 columns x 25 lines
GRAPHIC MODES
512 x 256 pixels in 4 colours maximum
COLORS
4 or 8 with RAM extension board
SOUND
Beeper
SIZE / WEIGHT
42.5(W) x 51.4(D) x 15(H) cm. Weight: 10.5 Kg.
I/O PORTS
1 x RS-232 port, 1 x RS-1232C enhanced serial port, 1 x custom monitor connector, 1 x Parallel printer port
BUILT IN MEDIA
2 x 160, 320 or 640 KB 5.25'' F.D. drives or 1 x F.D. drive + 1 x 11.25 MB Hard disk
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