There are a few games that rely on one specific false read: > They rely on the dummy read for the sta $4000,X instruction to acknowledge pending APU IRQs. htt

There are a few games that rely on one specific false read: > They rely on the dummy read for the sta $4000,X instruction to acknowledge pending APU IRQs. https://wiki.nesdev.com/w/index.php/Tricky-to-emulate_games https://wiki.nesdev.com/w/index.php/Tricky-to-emulate_games MMC1 ignores consecutive writes, and one games relies on the initially written false value: > Bill & Ted's Excellent Adventure resets the MMC1 by doing INC on a ROM location containing $FF; the MMC1 sees the $FF written back and ignores the $00 written on the next cycle. https://wiki.nesdev.com/w/index.php/MMC1 https://wiki.nesdev.com/w/index.php/MMC1