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PostPosted: Sat Sep 09, 2017 2:18 pm 
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Joined: Wed May 19, 2010 6:12 pm
Posts: 2359
I know $4210 has to be read once per frame to stop NMI, but does that reset $4200?


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PostPosted: Tue Sep 12, 2017 3:36 am 
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I don't think so from reading Nintendo's dev docs. Reading $4210 acknowledges NMI and resets the NMI Flag (bit 7 of $4210), but NMIs are only enabled/disabled using bit 7 of $4200.


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