The OSDev Wiki has a lot of information: https://wiki.osdev.org/Expanded_Main_Page https://wiki.osdev.org/Expanded_Main_Page https://wiki.osdev.org/Introducti

The OSDev Wiki has a lot of information: https://wiki.osdev.org/Expanded_Main_Page https://wiki.osdev.org/Expanded_Main_Page https://wiki.osdev.org/Introduction https://wiki.osdev.org/Introduction It's about Operating System development, but these bootable games are really simple, limited OSes: They don't have much functionality, but they do have to access hardware in all the same ways, so a lot of the same rules apply.