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This accessory was very common. It's a light gun, used for many games such as ''Duck Hunt'', ''Wild Gunman'', and ''Hogan's Alley'', to name three examples. When the trigger is pulled, the screen flashes black for a period of 1-2 frames 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 could be quite unreliable unless the lenses were cleaned very wellthoroughly clean. The Zapper plugged into controller slot 2 the P2 port and mainly worked with old CRT TVs; 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 accessory is very different from a standard controller of eight buttons. It was designed to be a controller where you need to use used with your feet, typically by running in place on numbered circles to represent the button presses. It plugs into controller slot 2 the P2 port and has 12 different buttons. Notable games such as ''Stadium Events'', ''World Class Track Meet'', and ''Athletic World'', utilize this, and trying to use a standard controller won't workis not an option. Despite being less accurate than puNES or Mesen, [[FCEUX]] actually supports this controller.

===NES Four Score/NES Satellite/4-Players Player Adaptor===This turned the standard two controller ports into four controller ports by plugging into the original twoboth P1 and P2. A few games utilize utilized this capability, such as LJN's ''A Nightmare on Elm Street''. Many emulators support this feature by having an option between switching to switch between 2-player and 4-player mode or just enabling/disabling Player 3 and Player 4's controller.

Technically not a peripheral because it was physically part of each model Model 1 Famicom, on the second player's controller is a microphone and volume slider instead of having start START and select SELECT buttons. One noteworthy game that makes use of this is the Japanese ''Legend of Zelda''. Pols Voice, an enemy, is destroyed if the player makes a loud sound into the microphone (in the US version changed this was changed to merely firing an arrow to 1-shot them). Another game to make use of the microphone is ''Takeshi no Chōsenjō'' (''Takeshi's Challenge''). [[VirtuaNES]] supports this, activated by tapping the 'M' key on default settings.

A Japan-only peripheral using the a magnetic disk format instead of cartridges, with its own unique games made for it, some game library. Some of which these were later ported to the regular NES/Famicom cartridge format with significant downgrades (especially particularly the loss of enhanced FDS hardware audio). This accessory made it possible to save game datawithout needing battery-backed ROM, but only for the game contained on each of the disks.

You'll need the fdsbios BIOS file to emulate games made for this peripheraladd-on. Switching disk sides will require using "Eject/Insert Disk", "Switch Disk Side", then "Eject/Insert Disk" again. It's interesting to note there are actually two versions of this the BIOS; [[Wikipedia:Family Computer Disk System|Nintendo's peripheral]] and [[Wikipedia:Twin Famicom|Sharp's Twin Famicom]]. The only difference is Nintendo's displays ''Nintendo'' while [[Wikipedia:Sharp Corporation|Sharp]]'s displays ''Famicom'' when the hardware is first booted. Other than that, they function identically.

Only one game used a keyboard to program in BASIC on the Famicom and that was ''[[Wikipedia:Family BASIC|Family BASIC]]''. VirtuaNES supports this keyboardit.

Different from either battery back-ups backed ROM cartridge or the FDS, ASCII Corporation (based in Japan) created their own method to save game data with the [[Wikipedia:Turbo File (ASCII)|ASCII Turbo File]]. VirtuaNES supports this too.

This accessory was a tablet for the Famicom games ''Oeka Kids: Anpanman no Hiragana Daisuki'' and ''Oeka Kids: Anpanman to Oekaki Shiyou!!''.<ref>http://www.ne.jp/asahi/oroti/famicom/ish15.html</ref> [[Mesen]] supports thisit.

ROMs made with VS System in mind which are accidentally played in the emulator's NES mode, (or playing a NES ROM in the emulator's VS mode, vice-versa) will cause the colors to be totally garbled. This can occur when there is either an issue with the emulator's configuration or the ROM's iNES header.

Also re-released later as Sharp's FamicomStation. It's a A bulky metal cube , with a slot to insert money and has secured with tons of locks which . It was distributed in select hotels and stores. It and can hold at once up to 15 select Famicom releasesat once, with and had many more hardware lockout chips and pins with different behavior than usual, and support for (it also only supported cartridges using memory mapper 0 games). It also has Sports a unique boot screen for both models released.

Neither the cartridges nor the BIOS have been dumped or tested with an emulator, unlike with the Super Famicom Box (which has had both its BIOS ' and most of its ROMs dumped).

A pirate NES Famicom clone which was sold in Russia and Eastern Europe, with the blueprint later reused for other Famiclones. Here's [http://www.youtube.com/watch?v=kne6AKyYUuM a link] to a CC-subtitled Kinaman video for more details. It's a very quirky NTSC NES optimized for 50Hz, with many other changes from the official PAL NES as well- though those these differences often break the compatibility of Dendy-specific releases on most emulators.

MESS supports this console, and some other emulators (such as Mesen, puNES and FCEUX) introduced support for it in r3134, along with the already included support for iNES 2.0 ROM headers (including the option to mark a ROM region as PAL Dendy). The carts cartridges themselves can still be played as long as the emulator supports broken cardscarts.

*[http://wiki.nesdev.com/w/index.php/Nesdev_Wiki Nesdev Wiki] - A place for all your NES programming, and /NES emulator programming needs.