A very small but full featured simulator, runs the same software as MegaEnigma but with a slightly modified IO layer. Does not have a physical plugboard, but the Mega2560 Pro Mini has enough available IO pins that one could be added later.
The PCB has been specifically designed to be manufactured using OSHPARK.com After Dark service, featuring a black PCB substrate and clear soldermask, therefore any copper will be visible. All the copper in the top layer was hidden under a component footprint.
A bigger version of this:
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