QuickNES is a Nintendo Entertainment System video game system emulator that can be used as a libretro core.
Nes_Emu, the core NES emulator library used by QuickNES, began as a very simple NES emulator sometime in 2004. It was based on the 6502 CPU core and APU sound core used in the Game_Music_Emu sound engine.
To build the debugging symbols use: DEBUG=1 QuickNES-Core.SlackBuild