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Developer(s) FCEUX Team
Latest version 2.6.6 [+]
Active Yes
Platform(s) Windows
Emulates NES
Website FCEUX.com
License GNU GPLv2
Source code GitHub

FCE Ultra Extended, typically shortened to FCEUX, is an open-source Famicom (NES) and Famicom Disk System (FDS) emulator. It began as an amalgamation of several FCE Ultra[1] forks, designed to unify the then vast number of FCE Ultra branches with differing features. FCEUX has itself been forked, though mostly to increase the amount of platforms it is on, such as a GameCube and Wii port known as FCE Ultra GX.


Windows Dev builds
Compiled on AppVeyor

Windows Dev Builds
Compiled by emucr
GameCube Wii Wii U FCE Ultra GX
Includes cheat files
GameCube Wii Wii U FCE Ultra RX
First fork of FCEUGX
GameCube Wii Wii U FCEUX TX
Fork of FCEUGX by Tanooki16, based in FCEUX 2.4.0

On Debian systems:

 $ sudo apt install fceux


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 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.

Parent projects

FCEUX is based on: FCEU (FCE Ultra), FCEUXD (FCE Ultra Extended Debugger), FCEU-mm (FCE Ultra mappers modified), FCEUXDSP, FCEU rerecording and FCE.
FCE Ultra forks merged into FCEUX:

  • FCEUD, added a Debugger and PPU viewer.
    • FCEUXD, added a Hex Editor, Name Table Viewer to FCEUD.
      • FCEUXD SP, intended to significantly improve the debugging of FCEUXD.
  • FCEU-mm, added many mappers (unlicensed and licensed).
  • FCEU rerecording, added features to help recording movie input files.

FCE Ultra itself is based on FCE and rewrote large portions of FCE code.[2] FCE (Family Computer Emulator)[3] by Bero, originally released in 1998[4] which was designed for PC-98 and PC-AT devices.

Note: FCE and forks NOT based on FCE Ultra are for versions of the operating systems from the 90's and may not run on modern versions.
These projects were NOT merged into FCE ultra or its forks:
FCE++ (added improvements to FCE, only for PC-98 and DOS). And ports include: FCE Linux (Linux port), xfce (Unix/X port), and NextFCE (FreeBSD fork).