4-bit HRRG Steampunk Computer (Heath Robinson Rube Goldberg)

By coincidence (searching for 6-bit and paper tape simulators), I found this project, first an FPGA remake
(3 parts post inclusing emulator, but obviously not finished yet)

The original one by Max Maxfield and Joe Farr is here, 4-bit data bus and a 12-bit address bus
Next to some other 4-bit and 8 bit computers there and here

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