An (unfinished) emulator suite for MOS6502 based systems. Currently only supports NES.
This is a project I started a while ago to gain some familiarity with C++, having previously only worked with higher level languages like Python and Java. I figured that writing an emulator for the 6502 microprocessor would be a good way to to get down to the nitty-gritty. After implementing the CPU (illegal opcodes notwithstanding), I thought it would be fun to actually do something with it, so I built an NES emulator on top of it. I had originally intended to implement emulators for a variety of other 6502 based systems as well, but I lost interest. With this in mind the emulator components were designed to be sort of modular. The code is pretty jank though; it's been a learning experience.
Emulation and rendering are implemented as seperate components. The emulator library, qk-emulator, has no dependencies beyond the C++ Standard Library. The renderer, qk-renderer, handles audiovisual output and player input and requires SDL2.
There is currently only limited support for the Nintendo Entertainment System:
- No audio, as the APU code is still too buggy to be usable
- Support for NTSC only
- Support for NROM cartridge based games only (iNES mapper 0)
Usage is as follows:
qk [path to iNES ROM file]
Controls are hardcoded as follows:
| NES gamepad | Keyboard |
|---|---|
| D-pad | Arrow keys |
| A | Z |
| B | X |
| Start | Enter |
| Select | Right shift |
(c) 2019-2020 pwssnk -- code available under GPLv3 license.