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→Zapper
===Zapper===
This accessory was very common. It was used for many games, such as ''Duck Hunt'' and ''Wild Gunman'' just for two examples. It's a light gun. When the trigger is pulled, the screen for 1-2 frames flashed black with a white rectangle (the target to shoot at). If the gun detected it was pointing at the white, it told the game to register a hit. Real hardware, this was very hit or miss. It mainly worked with old CRT TVs. Newer TVs will not register with the Zapper. Many emulators support this accessory with 100% accuracy hit detection, usually with a mouse click (PC), tap (for mobile), remote ([[Wii]] ports of NES emulators), or faked pointers using a controller.
===NES Four Score/NES Satellite/4-Players Adaptor===
This accessory turned the standard two controller ports into four controller ports by plugging into both ports. A few games utilize this capability, such as LJN's ''A Nightmare on Elm Street''. Many emulators support this feature by having an option between switching between 2-player and 4-player mode or just enabling/disabling Player 3 and Player 4's controller.
===Famicom Disk System===
