The Future
Speculations and theories on what comes next
A gameboy doesn't have an OS. It does however have a BIOS that shows the boot screen and contains some support routines that you can use. After a ROM is bootstrapped, most games ignore its presence entirely. When you're developing a game or a OS for this Nintendo platform, you communicate directly with the hardware, different from what Sony PlayStation Portable does(that have an OS layer to help you to do all), if you want to put something on the screen, you need to do all on something like a "Protected Mode"(this was just to illustrate for the beginners), that is communicating with the hardware without any kind of OS layer, and the same for the audio, input and all... Then, before you go inside this ARM world, you should know that the hardware will be all that you have, the address table of GameBoy Advance will your best friend on your journey.
