Jumper settings for the Olivetti M20

The Olivetti M20 computer contains a large number of jumpers on the motherboard. There are two mainboard revisions that are widespread: revision D (older) and revision G (newer). The two revisions are easy to recognize: in the D revision the Z8001 processor is under the keyboard where in the G revision it is in the center of the board.

Andreas Ziermann scanned the instructions for the revision D motherboards:



If you have a similar document for revision G motherboards, get in touch. If you want to configure the motherboard for accepting 128KiB RAM expansion, have a look at this page.

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