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All Projects â†’ dbousamra â†’ Hnes

dbousamra / Hnes

Licence: other
🎮 NES Emulator written in Haskell

Programming Languages

haskell
3896 projects

Labels

emulatornes

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hnes

Build Status

Welcome to hnes. hnes is a NES emulator written in Haskell.

Screenshots

Mapper support

The following mappers are supported:

  • NROM (0)
  • UNROM (2)
  • AOROM (7)

Lots of games run, but more don't. You can see which roms are compatible here: http://tuxnes.sourceforge.net/nesmapper.txt The best games seem to be MMC3, so that is a priority.

Mappers are basically custom memory modules that exist on the cartridges themselves, that allow referencing more memory than the NES originally shipped with. Sometimes they even do computation. A very clever idea, but a nightmare to emulate, since each mapper has to be emulated as well

Controls

Nintendo Emulator
Up, Down, Left, Right Arrow Keys
Start Enter
Select Space
A Z
B X

Building

Get Stack for building Haskell projects.

Windows instructions:

$ stack exec -- pacman -Sy mingw-w64-x86_64-pkg-config mingw-w64-x86_64-SDL2
$ stack build

OS X instructions:

$ brew install sdl2
$ stack build

Ubuntu Linux instructions:

$ sudo apt-get install libsdl2-dev
$ stack build

FreeBSD instructions:

$ pkg install sdl2
$ stack build

Running

To run:

stack exec -- hnes roms/tests/cpu/nestest/nestest.nes

Task list

  • [x] Basic structure
  • [ ] Mappers
    • [x] Loading roms
    • [x] Mappers
      • [x] UNROM
      • [x] NROM
      • [x] AOROM
      • [ ] CNROM
      • [ ] MMC1
      • [ ] MMC3
  • [ ] CPU
    • [x] All official opcodes
    • [ ] All illegal opcodes
    • [x] Nestest passing
    • [x] Blarggs CPU test roms passing
  • [ ] PPU
    • [x] SDL integration
    • [x] Background rendering
    • [x] Scrolling
    • [x] Sprite rendering
    • [ ] VBlank timing for Battletoads edge case
  • [ ] APU
  • [x] Controller input handled
  • [x] Performance tuning
  • [ ] Command line interface
    • [ ] Parse args
    • [ ] Use optparse-applicative
    • [ ] Some debug params?

Tests

There's a small test suite that is used to check for CPU and PPU accuracy. They use test roms rather than hand coding tests.

Just run stack test:

Known issues.

There are so many, where do I even begin.

  • Performance is pretty average still. I get around 80 fps on my 2015 i5 MacBook.
  • VBlank timing is off. I don't know the exact reasons, but it causes scrolling issues.
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