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I was looking into the idea of building a clockwork computer. Probably a 16-bit RISC based on a simple teaching instruction set (just over dozen instructions). Maybe a 4-bit prototype to work out how to actually implement everything.

Realistically even the prototype project is way beyond my skills but it doesn't look impossible. Actual performance would be in seconds-per-instruction ( mIPs = milli-IPs? ) with perhaps a few hundred words of memory.



Given that you need a really simple ISA, and probably also good code density, how about a Forth CPU, like https://excamera.com/sphinx/fpga-j1.html?




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