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How do relay switches work and how do I know what I need?
paigeoliver:
It would probably be a lot easier just to rig up a few adapters to change the pinouts of your oddball boards to match the most common config rather than trying to rig up a bunch of relays and such.
In the past I have even done a little jiggery pokery (trace cutting and jumper wires) on the boards themselves to make boards with funny button configs (or pinouts that vary by only a few wires) play nice in my cabinets.