Nestur is an NES emulator and a work in progress. There are likely still several bugs, and MMC3 support is not great. There are plenty of full-featured emulators out there; this is primarily an educational project but I do want it to run well.
- SDL2 is the only dependency
- no use of `unsafe`
- NTSC timing
- may only implement mappers 0-4 as these cover ~85% of games according to http://tuxnes.sourceforge.net/nesmapper.txt
The code aims to follow the explanations from the [NES dev wiki](https://wiki.nesdev.com/w/index.php/NES_reference_guide) where possible, especially in the PPU, and the comments quote from it often. Thanks to everyone who contributes to that wiki/forum, and to Michael Fogleman's [NES](https://github.com/fogleman/nes) and Scott Ferguson's [Fergulator](https://github.com/scottferg/Fergulator) for getting me unstuck at several points.
4. The `nestur` executable or `nestur.exe` will be in `nestur/target/release`.
5. Run with `$ ./nestur path/to/rom_filename.nes` or `> nestur.exe path\to\rom_filename.nes`.
6. If the game uses battery-backed RAM (if it can save data when turned off), a save file like `rom_filename.sav` will be created in the same folder as the ROM when the program is exited. When Nestur is run again, it will look for a file matching the ROM name, with a `.sav` extension instead of `.nes`.
