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Fearless-NES

Fearless-NES is a work-in-progress Nintendo entertainment system emulator written in Rust.

Screenshots

GUI Kirby's Adventure Super Mario Bros. 3 Legend Of Zelda Mega Man III Battletoads Super Mario Bros

Features

  • Cycle-accurate CPU emulation
  • Accurate PPU emulation
    • Mostly cycle-accurate, but has some timing bugs
  • Good APU emulation
    • Uses the blip buffer
  • Basic mapper support
  • Basic GUI
    • currently using egui
    • the code is a bit of a mess currently
    • immediate-GUI seems to be great for simple data visualization or simple GUIs, but making a full app with it is quite cumbersome
  • Save states
  • Gamepad support
  • Controllable overscan
  • Game loading using the NES 2.0 XML Game Database
  • Custom key bindings

Build instructions:

  1. Build with cargo run --profile=release-lto and enjoy !

Accuracy

For accuracy tests, see TESTS.md. Run these with 'cargo test'.

Supported mappers

Mapper Example Games
0 (NROM) Super Mario Bros, Donkey Kong, Balloon fight
1 (MMC1) Final Fantasy, Legend of Zelda, Mega Man 2
2 (UxROM) Castlevania, Mega Man, Contra
3 (CNROM) Solomon's Key, Arkista's Ring
4 (MMC3)* Kirby's Adventure, Mega Man 3-6, Ninja Gaiden II: ...
7 (AxROM) Battletoads, Jeopardy!
69 (FME-7) Batman: Return of the Joker, Gimmick!
  • Some MMC3 games have graphical glitches.

With these mappers, Fearless-NES should support 84 % of commercial NES games.

TODO

  • (frontend) user-defined RGB palettes

  • (frontend) NTSC / xBRZ filters

  • (core) iNES 2.0 support

  • (core) advanced mappers such as MMC5, VRC2/4...

  • (core) various accuracy tests

Controls

Keyboard

NES controller Keyboard
A F
B D
Select Space
Start Enter
Up ArrowUp
Down ArrowDown
Right ArrowRight
Left ArrowLeft

Gamepad

Gamepad Layout