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Core info
License GPLv2
Extensions nes, fds, unif

FCEUmm is a Nintendo Entertainment System video game system emulator that can be used as a libretro core.


FCEUmm (FCEUltra mappers modified) is a NES/Famicom emulator that specializes in extensive mapper support.

Feature Support

These are libretro features, not frontend or standalone emulator features.

Saves Save states Rewind Netplay Cheats Controllers API Rumble Sensors Camera Location Subsystem API


FCEUmm requires a real BIOS for Famicom Disk System emulation to work.

  • disksys.rom


This core has a few options that can be tweaked from the core options menu. The default setting is highlighted and in italics:

  • nes_palette (asqrealc/loopy/quor/chris/matt/pasofami/crashman/mess/zaphod-cv/zaphod-smb/vs-drmar/vs-cv|vs-smb/nintendo-vc/raw): Choose which color palette is going to be used.
  • nes_nospritelimit (disabled/enabled): Removes 8-sprites-per-scanline hardware limit.


The FCEUmm core supports one controller setting:

  • NES Joypad: Nintendo Entertainment System Controller
RetroPad NES Joypad
Retro Dpad.png SNES Dpad.png
Retro Y Round.png
Retro X Round.png
Retro B Round.png NES B.png
Retro A Round.png NES A.png
Retro L1.png
Retro R1.png
Retro R2.png
Retro R2.png
Retro Left Stick.png
Retro Right Stick.png
Retro L3.png
Retro R3.png
Retro Select.png SNES Select.png
Retro Start.png SNES Start.png

Compatibility List/General Issues

Main article: [1]

External Links