Correct with the Gameboy. In fact, that is literally all the very small ROM (256 bytes) in the Gameboy does: Display the logo from the cartridge and then compar

Correct with the Gameboy. In fact, that is literally all the very small ROM (256 bytes) in the Gameboy does: Display the logo from the cartridge and then compare it with the one in the ROM (makes it seem even tinier). If the comparison fails, the logo was still displayed scrolling down and making the bing sound, but the Gameboy now just halts. Everyone who had one in their youth knows the black block scrolling down with no cartridge inserted, and various variants of corrupted logos if contact was bad or the cartridge broken. This also means the Gameboy has no “OS” whatsoever, it’s all done by the games. But the system is too simple to need one anyway. That’s also why it’s so good for writing your first emulator.