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Does any game use VRC4/6/7 cycle mode IRQs?
http://forums.nesdev.com/viewtopic.php?f=3&t=16001
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Author:  AWJ [ Mon May 29, 2017 11:12 pm ]
Post subject:  Does any game use VRC4/6/7 cycle mode IRQs?

While working on that VRC2/4 submapper test ROM, I just noticed that FCEUX doesn't emulate the simple cycle-counting mode (without the 113 2/3 cycle divider) for any of VRC4, VRC6 or VRC7. Bit 0x04 of the relevant register is completely ignored. Also, an 8-bit cycle counter just doesn't seem very useful...

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