The Sega SG-1000 is a home video game console manufactured by Sega originally released in 1983 marking the company's entry into the home video game console market. It sold over 2 million units before it was discontinued in 1984.
The Sega Genesis, known in Japan as the Sega Megadrive, was developed by Sega and released in 1988. It was Sega's best selling console selling over 30 million units before it was discontinued in 1997.
The Sega Master System, known as the Sega Mark III in Japan, was developed by Sega and released in 1985. It sold approximately 13 million units before being discontinued in 1992.