advice on why NES DPCM is making MMC5 irq fluctuate?

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infidelity
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Joined: Fri Mar 01, 2013 4:46 am

advice on why NES DPCM is making MMC5 irq fluctuate?

Post by infidelity »

When I converted Mario 3 to mmc5, I also converted the original mmc3 irq's to mmc5. On real hardware, there is a very noticeable jump of the irq scanline, everytime a DPCM note is played. The irq will fluctuate/jump about 2 scanlines. I'm not sure if I'm missing something regarding $4010 and my mmc5 irqs. Thanks for reading. :-)
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