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Olivetti M20
M20 Olivetti M20

Welcome in the Olivetti M20 site



Marilyn This site is intended to be a meeting point for the M20 community and a collection of informations and manuals dedicated to this computer.

The Olivetti M20 was a personal computer dedicated to businnes and scientific areas. It was produced by the Italian company Olivetti between 1982 and 1985. Among its peculiarities there was the choice of the CPU, the Zilog Z8001, and the operating system, called PCOS, wich was developed by Olivetti expecially for this machine.
Olivetti has always been extremely attentive for the aesthetical design of its products; the M20 was not an exception and it was drawn by the pen of Ettore Sottsass.
We want to attempt to preserve as much as possible the technical informations and the software which was developed for this machine.

Recent updates


August-29-2006
Added Description of the M20 RAM mapping by Dwight Elvey and a scan of keyboard overlays for Oliword and the full screen editor with the manuals.

August-28-2006
Added the Oliword manual in English.

July-7-2006
Added a Pac-Man clone in the Z8000 machine language in the Programs and games files section (the Basic section changed its name).

July-5-2006
Could not sleep: too hot tonight.
Added some screenshots and a small Quicktime film in the Download software in Basic section (yet, there are not basic programs).


July-1-2006
Inserted detailed instruction on how to configure the mainboard for 128KiB expansion cards
Andreas made a SIMM memory expansion. Added his photos to Making a 384KiB ram expansion, part II


June-29-2006
Added the "Olivetti M20 installazione ed uso" manual in Italian. It contains a very nice description of the machine configuration and use.
Added photos of the Andreas's M20 DES


June-20-2006
The memory expansion project is brought to the full 384KiB capacity:
Making a 384KiB ram expansion, part I
Making a 384KiB ram expansion, part II, by Davide Bucci
Added the instructions on how to realign the heads of a floppy disk drives

June-14-2006
Added instructions Making a 128KiB ram expansion, by Davide Bucci


June-6-2006
Added instructions connect a TRS hard disk to the M20, by Dwight Elvey


May-24-2006
ISAM manual added in the Manuals collection.
Fixed some issues in the HTML 4.01 transitional validation.

May-18-2006
ASM/PCOS manual added in the Manuals collection.

Avr-20-2006
New disk images added, in particular Oliword, a drawing program.


Mar-12-2006
After an hacker attack, the site PHP source has been checked and corrected for a security issue which allowed malicious PHP code to be executed on the server.
A new host has been found.
The graphical style of the site was renewed. Some photos of jumper settings have been added in the page: Modifying RAM expansion cards by Dwight Elvey


Feb-2-2006
Slight restyling of the Manuals page and some German manuals added.
More adsvertisements in the press section
Added schematics of the 128kB B/W RAM expansion, in the hack section of the site.
Added a description of the jumper settings to configure the M20 for 128kB expansions in the page: Modifying RAM expansion cards by Dwight Elvey
Added the page Description of the M20 BIOS

Nov-21-2005

Added the XMODEM exchange protocol and a lot of BASIC files:
Transferring files
Download software in Basic
The repairing section has been ampliated:
Repairing
Connecting the M20 to an Olivetti L1 monitor:
Using an Olivetti DSM1219 monitor on the M20

Nov-3-2005

The Olivetti M20 site goes online. Thanks to Olivetti80 and Jon Zaid for the hosting





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