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'''FCE Ultra Extended''', typically shortened to '''FCEUX''', is an open-source [[Nintendo Entertainment System emulators|Famicom (NES)]] and Famicom Disk System (FDS) emulator. It is began as an amalgamation of several FCE Ultra forks, designed to bring unify the then vast number of FCE Ultra branches to a halt due to the vast number and their with differing features. Ironically, it FCEUX has also itself been forked, though mostly to increase the amount of platforms it is on, such as a [[GameCube emulators|GameCube]] and [[Wii emulators|Wii]] port known as FCE Ultra GX.

*[httphttps://wwwci.emucrappveyor.com/searchproject/zeromus/fceux/labelbuild/Fceux SVN Buildsartifacts Git Autobuilds on AppVeyor]*[httpshttp://ciwww.appveyoremucr.com/projectsearch/zeromuslabel/fceux/build/artifacts Git AutobuildsFceux EmuCR's mirror of autobuilds]

Despite its extensive toolset, it is less accurate than other NES/FDS emulators like [[Nestopia]], [[Mesen]] and [[puNES]]. However, thanks to FCEUmm being one of the forks it incorporates, it still has its uses as a highly compatible standalone emulator. It is recommended to download the latest SVN AppVeyor build as the stable release is very old. It is also popular for developing new NES games, due to its excellent debugging tools, however, if you develop games/ROM hacks, be sure to test them on more accurate emulators, and/or with a flash cart on the real system to ensure compatibility.