I own a pinball machine (Williams Earthshaker, from the 1980's). Is asking questions about how to fix it or maintain it on-topic here? Part of me thinks it's not, because it's not really about "computing", and yet part of me thinks that it is because at its core this particular machine at least is just a 6808 CPU computer that happen to have a bunch of switches, lights, and solenoids. It almost seems like older electromechanical pinball machines probably wouldn't be on topic, but newer embedded video game systems mostly are, so I'm not sure where the line should be.
And if not, is there a better StackExchange place that would fit?