SegaEMU

SegaEMU is a Sega Mega Drive/Genesis emulator for Windows made by Atani Software. It features SG-1000, Sega Mega Drive/Genesis and SEGA Mega CD emulation. However, the emulation is rather buggy and Z80 emulation is not there (you can select it, but it doesn't work). On semi-modern or better PCs, the emulator runs way too fast (300-400FPS) making the games unplayable.