This fellow has some interesting projects. A 6502 opcode compatible
CPU implemented in latches and EEPROMs. A NAND-gate based MC14500B.
And a CPU using (mostly) only transistors. Also a introduction to
microprogramming article, and some other good stuff.
<URL:
http://people.freenet.de/dieter.02/index.htm >
I don't know if anyone else mentioned this page in the past. I
don't recall it, and I tend to follow the homebuilt CPU threads here.
If you've seen it already, sorry about that.
--jc