References:
- http://www.qmtpro.com/~nes/misc
- https://wiki.nesdev.org/w/index.php?title=Nesdev_Wiki
- https://www.youtube.com/watch?v=8XmxKPJDGU0
- https://skilldrick.github.io/easy6502/
- https://nerdy-nights.nes.science/#main_tutorial-2
- https://wiki.nesdev.org/w/index.php?title=Emulator_tests
- http://archive.6502.org/datasheets/rockwell_r650x_r651x.pdf
- https://www.youtube.com/watch?v=qJgsuQoy9bc
- https://web.archive.org/web/20191023181630/http://www.obelisk.me.uk/6502/