In the history of video games, the fourth generation of game consoles, more commonly referred to as the 16-bit era, began on October 30, 1987, with the Japanese release of NEC Home Electronics' PC Engine (known as the TurboGrafx-16 in North America). Although NEC released the first console of this era, sales were mostly dominated by the rivalry between Sega and Nintendo across most markets: the Sega Mega Drive (named the Sega Genesis in North America) and the Super Nintendo Entertainment System (SNES; the Super Famicom in Japan). Cartridge-based handheld consoles became prominent during this time, dominated by the Nintendo Game Boy (1989). Color handhelds were also released, including the Atari Lynx (1989) and Sega Game Gear (1990).