> EXTREMELY long time lurker here, and finally got around to registering. If you look > closely at the manual (image located here > (https://www.arcade-museum.com/manuals-videogames/M/marvel-super-heroes.pdf) you can > see by the pinout that pin R on JAMMA is for service (Free Credit). I have not > checked the actual MAME code so I do not know if this connection has been fully > registered, but I'm wondering if this may be a clue. > > Greg
Holy crap it works!
I found this youtube video that explained it a bit better and it worked! https://www.youtube.com/watch?v=yLg-j82QbNg
The credit switch is indeed the #5 key. You have to enter the button combination at a medium pace at the character select screen and release the coin button when you're done.
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