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 "Homebrew CPUs: Messing around with a J1" 
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Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1372
Interesting article over on FPGArelated, about the small and simple J1 CPU (good for Forth, apparently very clean verilog, and only just over 100 lines of it) and some illustrations of how easy it is to make changes to it:

Image

The original J1 is on github here

The article also recommends "the must-read book by Philip Koopman, Stack Computers: The New Wave. If you haven't read it, you really should."


Fri Oct 30, 2015 10:53 pm
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Joined: Mon Oct 07, 2019 2:41 am
Posts: 67
If you are using a FPGA why not go 24 bits. Memory is cheap compared to 1974.


Mon Oct 07, 2019 7:33 am
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