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The Famicom Disk System (FDS) is a Japan-only add-on which played games from a special Nintendo-only magnetic disk format strongly reminiscent of floppy disks of the time. It worked in tandem with the main Famicom unit, reading data off the disk but using the hardware of the Famicom and FDS combined. It featured an extra FM sound channel, which allowed for richer sounds and music than is possible on the regular console. While many games featured an FDS and Famicom version (being ported back to cartridge format as memory prices fell later that generation), the FDS versions generally stand out for their richer sound utilizing this extra circuitry, though the addition of loading times may more than cancel out this benefit out for some players. 

*[[Mesen]] is the most accurate NES emulator according to testscurrently established NES test ROM suites.<ref name="mesentest">http://www.mesen.ca/TestResults.php</ref> It should be the emulator of choice for those who desire the utmost accuracy. Mesen is also very user-friendly and supports a lot of features that other emulators are missing such as netplay, auto-updating, good built in filters, both .zip and goodmerged file loading etc. PuNES has a few mappers that Mesen doesn't support yet.*[[PuNES]] is the second most accurate NES emulator according to these testsa separate test battery run by the TASVideos community.<ref name="nestas">http://tasvideos.org/EmulatorResources/NESAccuracyTests.html</ref> That's not to say that it will generate an absolutely perfect experience compared to actual hardware. PuNES also supports rewinding in games. While Mesen has more overall mapper support than , it, should be noted that PuNES has two mappers that Mesen doesn't support yet; : 116 and 208, so . This allows games like Kart Fighter and Somari are to be supported for it and not Mesen.*[[Nestopia]] also has a high ranking in those same tests.<ref name="nestas"/> Even so, Nestopia has issues with The Young Indiana Jones Chronicles and doesn't display the status bar in Mickey's Safari in Letterland correctly (among other problems). Nestopia Undead Edition (Nestopia UE) is a fork of Nestopia meant to keep it alive and fix the aforementioned bugs. This version is generally recommended over vanilla. The Even the libretro core for Nestopia is Undead Edition in libretro form.*[[Nintendulator]] and MyNes also have a fairly high ranking in the those tests.<ref name="nestas"/>*[[FCEUX]] scores rather low in the these tests, despite being a recommended emulator on TAS Videos. The New PPU is more accurate than the Old PPU, thankfully. The emulator is still useful, though, thanks to its robust Lua scripting and incorporating FCEUmm into its feature set.*[[VirtuaNES]] also scores quite low in the tests, but it also in turn supports several obscure [[#Peripherals|peripherals]] that are not supported available on other emulators.*For official emulation, use [[Virtual Console]]. It is very accurate and has the backing of many of the developers, including Nintendo, Capcom, Square Enix and Namco. The Wii has a significantly larger library of NES games to choose from than the 3DS or Wii U, especially from third-party publishers.

There are many more other NES emulators not listed here, as the NES has more emulators than any other system (and new ones are started all of the time). Only the ones those that are well known or stand out in some way are listedcovered here.

[[File:Retroarch_2013-08-16_06-32-24-62.png|thumb|250px|Example of faulty visuals that are exposed when no overscan is cropped. Note the blank blue area to the left and the green garbage on the right. On NTSC CRT TVs, these areas may or may not be visible]]Several NES games need the their overscan to be cropped to look proper. There Unfortunately, there is, however, seemingly no standard level of overcropping. Many games seem appear to require different levels of overcropping for best results. For example, SMB3 requires quite a lot of cropping, however the same level of cropping will certainly obscure the letters of the status bar in Castlevania games. It did not seem that there was standardization until the next generation of consoles. 

Unlike consoles such as the SNES, which natively generate their image in pure RGB, the Famicom normally generates and outputs an encoded NTSC video signal, which . This must then be decoded by the TV's built-in NTSC decoder. This , which means the resulting color palette often varies depending on the display's decoder. This is why For this reason NES games will appear to have different colors on different TV sets. Because To properly emulate this part of thisthe NES experience, many Famicom emulators have a variety of different palettes to choose from.

There were many accessories released for the NES but Emulation General only covers accessories that are truly differentiated data streams from the basic controller (input data stream). For example, the Power Glove is in actuality just a really complicated NES controller, designed to convert motion into dD-padPAD, selectSELECT, startSTART, aA, and b B button commands. The same goes for R.O.B. and his ''Stack-up'' and ''Gyromite'' games because he was really just the second player. Strangely, the Famicom has a lot more peripheral hardware to emulate than the NES.<ref>[[Wikipedia:List of Nintendo Entertainment System accessories|List of Nintendo Entertainment System accessories]]</ref>

This accessory was very common. It's a light gun, used for many games such as ''Duck Hunt'', ''Wild Gunman'', and ''Hogan's Alley'', just just to name three examples. When the trigger is pulled, the screen flashes black for a period of 1-2 frames flashes black with while displaying a white rectangle (indicating the target to shoot at). If the gun detects it is pointing at the white rectangle, it tells the game to register a hit. On real hardware this was very hit or missunreliable. The Zapper plugged into controller slot 2 and mainly worked with old CRT TVs. Newer ; newer LCD TVs will not register with the Zapper. Many emulators support this accessory with 100% accurate hit detection in the form of a mouse click (PC), tap (for mobile), remote ([[Wii]] ports of NES emulators), or faked pointers using a controller.

This controller was released by Taito with one button to "fire" and a dial to control back and forth movement. ''Arkanoid'' is the only NES game to utilize this peripheralit, but it is still optionaleven so. [[Mesen]] supports this controller.