Well obviously I don't mean invent as such when I say that...that's been done. But wouldn't it be an interesting project to try to build one from separate logic gates? Just a simple 4-bit processor...it wouldn't be useful, but it would be cool. Or perhaps you could allow yourself to stretch to relatively simple integrated circuits like multiplexers and decoders, just for practicality's sake...implement the RAM using flip flops...and have buses made of bellwire...I/O in the form of a bunch of switches and some LEDs...
I don't have enough time to kill right now, but I'm sure this could be a fun project for someone who has! The idea appeals, anyway. The spirit is willing, but the mind is weak :-)
- Freon
