> I have two issues though which are bugging me as I can’t fix them. The first is the > coin mech now doesn’t work when on mame, it worked great as a jamma cab but now > nothing... The coins are just rejected and the test credit button doesn’t work > either. I have removed AC power feed from the cab as recommended and the coin light > has gone out as expected but it should still operate shouldn’t it?? Even in notepad > nothing when coins are inserted where as the other arcade joysticks and button > register fine as expected.
If coins are rejected, then something is wrong with your mech. Maybe it only takes tokens, or is configured for foreign currency. Also, I think that some coin mechs have a circuit that only allows coins to register when the mech is powered. If that's the case, it can probably be bypassed somehow.
Also, you should make sure that your cabinet is actually wired to the JAMMA standard. Trace the wire from the coin switch all the way to the JAMMA connector.