The Xerox 820 reference article from the English Wikipedia on 24-Apr-2004
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Xerox 820

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The Xerox 820 was an 8-bit desktop computer sold by Xerox. The computer featured floppy disk drives for mass storage, and used the CP/M operating system. The design of the microprocessor board was a licensed variant of the Bigboard computer.

It used a Z80 processor clocked at 2.5MHz, and boasted 64k of RAM.