Ikari Warriors sound is sick

isucamper

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So I turned on my Ikari Warriors for the first time in a few months, and it sounds sick. Game plays perfectly, but the sound pitch is all messed up. The music and sound effects play really slow, then speeds up a bit, slows down, speeds up a bit more, slows down worse then ever, and keeps doing this forever. As time goes on, it does seem to get up to speed, and last night it got up to where it should be after a while, but tonight it never did.

Any ideas?
 
I've never found schematics for Ikari. If you find a set, let me know and I'll gladly look them over for likely causes.

All I know is what the MAME driver tells me; that one of the Z80s is for sound, and it has a YM3526 synthesizer.
 
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