"Game boy DMG" z80 CPU

Nintendo's Game Boy and Game Boy Color handheld game systems used a Z80 with a slightly different instruction set (the index registers and alternate register set are missing, but auto-increment/decrement addressing modes have been added), manufactured by Sharp Corporation. Game Boy Color is notable for its ability to selectively double the CPU clock speed when running Game Boy Color software. The currently available Game Boy Advance series of products still includes this same modified Z80 for backward compatibility.