This is an old post, preserved for reference.
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Following on from the Z80 Single Board Computer I previously built, I've now turned this into a computer which can run CP/M. This was a popular alternative (and predecessor) to DOS in the early 1980's. It ran on most Z80 or 8080 based computers, many of the multiple board S100 backplane type systems from the late 1970's / early 1980's, such as the Altair 8080 and the RML 380Z. Some home computers of the day had add ons which allowed them to run CP/M, such as the Torch BBC Z80 second processor.
everything you ever wanted to know about disk drives - but were afraid to ask), so was easier to support.
CP/M on breadboard page, upon which this is based. He has put a lot of work into that and provided clear instructions and all software required to get up and running.
Richard Russel's BBC BASIC for CP/M.