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FCEUX is a Nintendo Entertainment System (NES), Famicom, and Famicom Disk System (FDS) emulator. It supports both PAL (European) and NTSC (USA/JPN) modes. It supports both Windows and SDL versions for cross compatibility. FCEUX is an evolution of the original FCE Ultra emulator.


Platform Version Device Exec Type commandline_format
Linux 2.1.0 ROM /usr/bin/fceux D "[rompath]/[name].[romext]"

Additional Settings

Edit ~/fceux/fceux.cfg

Update or install the following settings

SDL.Fullscreen = 1

SDL.KeepRatio = 0

SDL.Hotkeys.Quit = 27

Explanation of settings changes

  • SDL.Fullscreen = 1 // make the emulator fullscreen
  • SDL.KeepRatio = 0 // ignore display ratio
  • SDL.Hotkeys.Quit = 27 // Exit with Escape

Remapping Keys

Edit fceux.cfg and insert the appropriate SDLKeyCode

External Links