Giorgio's external hard disk driveGiorgio has recently found a nice M20 system with an external hard disk drive. Here are a few pictures of his system.
The back of the massive disk drive unit. Big fan! These units were not very different from a familiar of disk drives based on the WD1000, such as those used in the Tandy TRS-80 system. Have a look here
The back of the M20 with the flat cable used to connect the external hard disk drive. The Olivetti interface was nothing more than an address decoder which was used to access the WD1000 controller registers.
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