This emulator needs the GB bootrom in roms/bootrom.gb to boot.
Currently only the GB bootrom is known to run.
- https://pastraiser.com/cpu/gameboy/gameboy_opcodes.html (errors included)
- https://rednex.github.io/rgbds/gbz80.7.html
- https://gekkio.fi/files/gb-docs/gbctr.pdf
- http://imrannazar.com/GameBoy-Emulation-in-JavaScript:-The-CPU
- https://bgb.bircd.org/pandocs.htm
- Reset CPU flags in each ALU operation ?