Some versions don't, like the GameBoy Micro and, in a sense, the Nintendo DS which includes the GBA CPU but not the GB one. There's already an emulator called G

Some versions don't, like the GameBoy Micro and, in a sense, the Nintendo DS which includes the GBA CPU but not the GB one. There's already an emulator called Goomba that runs on the GBA, even in older GBA models it's useful because you can launch it from a GBA flashcart