On further examination, it appears that I can set "or" controls in, say, Asteroids, the old fashioned way, by entering multiple inputs, one-at-a-time, but it doesn't work when setting up Nintendo Entertainment System (USA) controls. It doesn't work in Super NES (USA) either. It does work with the Game Boy system. So it isn't all of MESS that's behaving this way.
Is this perhaps a bug?
If it is, I'll test all the MESS systems and send a report to MAMETesters.
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