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→Mappers: language
* '''No Mapper:''' Supported on every emulator even official Nintendo emulators.
* '''Official Mappers''' (UNROM, AOROM, MMC1-6): Most emulators, as well as Nintendo's Virtual Console (but not their GBA emulators), will cover these.
* '''Third Party Mappers:''' Since (Various: e.g. Konami's VRC6/VRC7) While officially licensed by Nintendo, they were not allowed outside Japan. As a result, for their Western releases, many games redid their soundtracks that took advantage of FM their features (advanced ROM mapping, extra sound offered by thesechannels) were reprogrammed significantly and shipped on the official mappers, often with simplified soundtracks. A lot of fan emulators worth their salt will cover these. With those, you cover the entire officially licensed library.
* '''Unlicensed Mappers:''' Mostly used by pirate cartridges, often long past the console's official commercial lifespan. Only the more accurate emulators (Mesen, FCEUX) will even bother covering them in a whack-a-mole quest for every new one discovered to this very day. If you're not interested in '''unlicensed''' Chinese or Russian bootlegs or newer unofficial NES demakes, it isn't a problem.
The NES ROM information isn't sufficient to describe the cartridge and emulate it, so emulators have to include the layout and behavior of these mappers in their code, while the ROM header tells the emulator which mapper to choose. So unlike with other consoles, no matter how an accurate a given NES emulator is accuratewill get, it will still can't never be able to run newly discovered ROM dumps from cartridges that used an original a so-far unknown mapper. Thus, Unlicensed NES support will be inevitably incomplete and a constant work-in-progress, hence claims some emulators are "inaccurate" because their unlicensed NES rom support is inevitably complete and still a constant WIP.
===Overscan===
