Does $4200 have to only be written to once?
Moderator: Moderators
Forum rules
- For making cartridges of your Super NES games, see Reproduction.
-
- Posts: 3140
- Joined: Wed May 19, 2010 6:12 pm
Does $4200 have to only be written to once?
I know $4210 has to be read once per frame to stop NMI, but does that reset $4200?
Re: Does $4200 have to only be written to once?
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.