> Right, but the part that confuses me is that just drawing each frame twice doesn't > seem to work, either. If I add the black frames using the GroovyMAME technique but > don't force the games to run at 120hz, it doubles the refresh rate, but there's > hitching and audio breakup.
Right, because as I said, MAME isn't built to do that, and would likely require a major rewrite to support that kind of operation. I suggest just settling for normal gsync and enjoying the perfect scrolling on odd-refresh games.
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