@agonzalez this is my current project. A Cifer 1887 which has four (count 'em) Z80A processors. One for the Processor board, one for the Disc Controller, one for the Graphics board and one for the SASI interface. Oh, and there's a Motorola 68000 add-on board too. Is that enough? 🤔😁

Runs CP/M and can (in theory) run Unix System III.