Higan the Super Nintendo/GameBoy/GameBoy Color/GameBoy Advance/Sega Master System (Mark III)/Sega Game Gear/Sega Mega Drive (Genesis)/NEC PC Engine (Turbografx-16) emulator has been updated , heres whats new:

- This release adds very preliminary emulation of the Sega Master System (Mark III), Sega Game Gear, Sega Mega Drive (Genesis), and NEC PC Engine (Turbografx-16). These cores do not yet offer sound emulation, save states or cheat codes.

More info --> http://byuu.org/