A 6502-Based Expansion Board for a Z80-Based Homebrew Computer

A 6502 board for the RC2014. (📷: ancientcomputing)

For the uninitiated, PCB design is pretty addictive. It’s like knitting and solving puzzles at the same time.

However the 6502-based CPU board he’s put together is by far the most impressive. On his site Ben outlines his design process, and deep dives into how he got a 6502-based card to talk to a Z80-based system. This isn’t a trivial feat as the two processors have very different design philosophies—with the 6502 using a strict synchronous bus, and the Z80 using a loosely asynchronous bus. He then talks about software before doing some crude performance testing.

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Scientist, Author, Hacker, Maker, and Journalist.

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Alasdair Allan

Alasdair Allan

Scientist, Author, Hacker, Maker, and Journalist.