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The same author also has a very nice and detailed description of another project, the "KimKlone" [0], which is basically a coprocessor for the 65C02 CPU, injecting itself onto the address and data buses in such a way as to implement new "opcodes" for the 6502, effectively giving it extra registers and instructions designed to hardware accelerate a FORTH interpreter.

[0] http://laughtonelectronics.com/Arcana/KimKlone/Kimklone_intr...

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Thanks for your interest in my projects, 6502nerdface. You've linked to the "chatty" KK article but there's kinduva TLDR version, which folks may prefer, here [1]. In particular the block diagram covers a lot of ground.

Regarding the One-bit computer: although that writeup is a few years old, it so happens that I tweaked a rewrote a few bits just few days ago! I'm pleased by how much attention it has attracted since it was first published. (At the same time it's startling that the mere mention of MC14500 left some apparently inattentive readers with a false impression. What I built is NOT a '4500 machine!)

[1] http://laughtonelectronics.com/Arcana/KimKlone/Kimklone_shor...

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