Interesting. I'm currently working on a base-4 2 bit processor, so it also has 16 commands. I have 4 addressing bits, though, so I can do a lot more with said commands

BTW, 4 quaternary bits = up to 256 options

Sounds like a cool project! Mine's still in the design phase

I've only managed some of the base circuits, like a multiplexer to choose the command, the memory, and the three base logic gates. XOR is not happening
