Although NEC released the first fourth generation console , and was second to the SNES in japan , this eras sales were mostly dominated by the rivalry between Nintendo and Sega 's consoles in North America : the Super Nintendo Entertainment System ( the Super Famicom in Japan ) and the Mega Drive ( named the Sega Genesis in North America due to trademark issues ) .
Although NEC released the first fourth generation console , this generation was dominated by Nintendo and Sega .