Links

http://gameboy.mongenel.com/dmg/asmmemmap.html
https://realboyemulator.wordpress.com/2013/01/03/a-look-at-the-game-boy-bootstrap-let-the-fun-begin/
http://gameboy.mongenel.com/asmschool.html
http://gameboy.mongenel.com/dmg/helloasm.txt
http://gameboy.mongenel.com/dmg/lesson1.html
http://gameboy.mongenel.com/dmg/opcodes.html
http://wikiti.brandonw.net/index.php?title=Z80_Instruction_Set
http://gbdev.gg8.se/wiki/articles/Video_Display
http://gbdev.gg8.se/forums/viewforum.php?id=2
https://imanoleasgames.blogspot.com/2016/12/games-aside-1-super-game-boy.html
http://www.devrs.com/gb/software.php#tilemap
https://github.com/bitnenfer/flappy-boy-asm/blob/master/src/game/menu.z80