> That's why I think he's referring to an actual physical switch found in the machine. > Something that can't be found in MAME.
In a real arcade cabinet you have a coin mech that counts the coins you put into the cab, but on the inside of the door there is normally a switch that gives the same signal to the board so the operator can test it.
In mame you press 5. We call it coin, but other people call it credit.
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