M20 Olivetti M20

Andreas Senk M20 collection

Andreas has several very nice M20s.

Three M20 The family: three working M20s: from left to right there is a D, a DES and a ST.

M20DES An Olivetti M20 DES with a mysterious piece of hardware, from Olivetti.

M20DESA particular of this peculiar DES version.

The Mistery BoxThe mysterious box attached to the M20 DES. The black thing on the front is a keyhole. Maybe a protection system? Or an hardware watchdog system?

External label of the boxThe back label of the external box

The controllerThe controller inside the M20, connected to the external box.

The controllerThe controller. The big chip on the center of the board is a programmable interrupt generator.

Another view of the controllerAnother view of the internal controller.

Inside Mistery BoxThe inside of the external box: a redundant power supply?

M20 DES motherboardThe M20 DES motherboard

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