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There is no 'latch was written' flag, and OPNA does not have 4 latches. This fixes SNK Beast Busters startup jingle. See https://github.com/aaronsgiles/ymfm/issues/65 which this PR resolves. The fix has...
OPL2 waveform enable bit wasn't hooked up at all (aka OPL compatibility mode, 1=OPL2, 0=OPL1). It's a simple fix and resolves https://github.com/aaronsgiles/ymfm/issues/42
SNK Beast Busters startup jingle is a high-pitched noise. https://github.com/mamedev/mame/blob/master/src/mame/snk/bbusters.cpp It has an YM2610. Video reference on how it should sound: https://www.youtube.com/watch?v=KKWNqGkptXc&t=600s This was a bug reported by @angelosa and...