Secrets of the Nintendo Game Boy Boot Logo (youtube.com)

for anyone interested in game boy here's the ultimate talk:

https://media.ccc.de/v/33c3-8029-the_ultimate_game_boy_talk

The guy who hacked around the boot logo check with an FPGA was also a great watch:

https://m.youtube.com/watch?v=ix5yZm4fwFQ