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That's not how the arcade version worked.
In any case, can't you just put a roll of virtual quarters/25p in the machine regardless?
I don't have it but I guess it must be in AES mode, where it has limited continues
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Paratech2008: Why does King of Fighters 2003 have limited credits?
That's not how the arcade version worked.
Oh, but that's absolutely how the Arcade version worked: once you ran out of quarters, it was "game over" for you. ;o)