This is a simple, no-frills NES emulator that I created for learning purposes in two weeks. It was during a low-load period at school and because I was bored.
This emulator is written by Dan Spencer. No code was borrowed except for some hardcoded palette tables from Mednafen.
It's buggy and missing a lot of functionality, and I don't actually recommend using this. Have a look at FCEUX and Nestopia, which are vastly superior.
Because writing emulators in Java is insane, I naturally gave it a shot. The code is fairly modular and clean in comparison to some other emulators out there. Performance optimizations were sacrificed to obtain cleaner code, but for Java it's still okay. Lots of indirection was used with the CPU instructions in particular.
Am I to do this again, it would be in C or another language with deterministic execution like rust.
- Audio
- Configurability
- Mappers other than NROM
- Much more
- Super Mario Bros
- Donkey Kong 1-3
- Balloon Fight
- Some MMC1 games, but with broken character sets (Megaman II, The Legend of Zelda)
- No game with a mapper other than NROM (a lot)
- Just about everything else
The front-end driver that uses Swing to display graphics and get input.
The 6502 CPU machine logic, and only the CPU logic.
Memory mapping implementations for use with the 6502 machine. Technically separate from machine6502, used by the NES engine.
The NES engine. Handles the loading and execution of ROMs.
The nes.GameRunnable class, when constructed and run, will notify a callback
when a buffer is ready to be displayed. In this cases, the GUI is notified.