http://devernay.free.fr/hacks/chip8/C8TECH10.HTM https://massung.github.io/CHIP-8/ https://github.com/dmatlack/chip8/blob/master/roms/demos/Maze%20(alt)%20%5BDavid%20Winter%2C%20199x%5D.ch8 http://craigthomas.ca/blog/2015/02/19/writing-a-chip-8-emulator-draw-command-part-3/