I think the Floppy Bird uses Real Mode[1], which provides an easy access to various devices directly through the BIOS. Practical opearting systems switch to pro

I think the Floppy Bird uses Real Mode[1], which provides an easy access to various devices directly through the BIOS. Practical opearting systems switch to protected mode, which provides more features, but doesn't allow you to use BIOS interrupts (and at that point you need to start writing device drivers). 1. http://wiki.osdev.org/Real_Mode http://wiki.osdev.org/Real_Mode