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Testing out the gamepad. I initially had an issue with only the start and select buttons working. Alas, I determined that there are three seperate grounds. One for the D-pad, one for select and start, and one for A, B, X, and Y. I don't exactly get that, but so be it. Soldered in the 3 sets of grounds and will wire them accordingly to the arcade controls. (Nov. 18, 2020 9:46pm)