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Writing a NES emulator is a fun programming challenge. Start here: https://www.nesdev.org/wiki/NES_reference_guide

and maybe read this first to understand where to begin with emulating an old CPU such as the 6502

http://www.emulator101.com/

The 6502 bit is fun, but the NES PPU not so much! I never got past that part, maybe one day ...

Yes the PPU is more complex than the CPU, but the audio emulation was more difficult than the PPU for me. Noticed the audio is a TODO for this emulator.

Just for fun and learning, after writing a CHIP-8 emulator, what would be a good first emulator for a real device to tackle?

NES or Gameboy are my two main ideas, but I'm curious if there are other suggestions.

Any 8 bit machines will have similar complexity and difficulty. Personally I have only done the NES as my first and only emulator. I used C++.

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