Sega was founded in 1940 as Standard Games in Honolulu, Hawaii. In 1951, the company moved to Tokyo, Japan and in 1952 was renamed Service Games. In 1965 Service Games merged with Rosen Enterprises and became Sega Enterprises. They also developed home video game systems until 2002.

They have released several consoles, computers, and retro consoles that play preloaded games from their past systems.

Released
2022
Limited Edition, Co-Designed By M2
Micro Retro Video Game Console
Limited Edition, Co-Designed By M2
Micro Retro Video Game Console

1994
Fourth Generation. 2nd Genesis model
16-Bit ROM Cartridge-Based Home Console

1993
Fourth Generation. 2nd Mega Drive model
16-Bit ROM Cartridge-Based Home Console

1990
Fourth Generation
8-Bit ROM Cartridge-Based Handheld Console
Third Generation. 2nd worldwide Master System
8-Bit ROM Cartridge-Based Home Console

1989
Fourth Generation. North American Mega Drive
16-Bit ROM Cartridge-Based Home Console. 1st Genesis model

1988
Fourth Generation. 1st Mega Drive model
16-Bit ROM Cartridge-Based Home Console

1986
Third Generation. 1st worldwide Master System
8-Bit ROM Cartridge-Based Home Console.

1985
Third Generation. 1st Master System in Japan
8-Bit ROM Cartridge-Based Home Console 
1984
Second Generation. 2nd Sega SG-1000 variant
ROM Cartridge-Based Home Console

1983
Home Computer
Variant of the SG-1000
Second Generation
ROM Cartridge-Based Home Console


There are also several branches within Sega:

There are also several defunct branches:
Games Developed By Sega
1987
Point-and-Click Adventure: Sherlock Holmes travels across London to solve the mystery behind a portrait of a woman named Loretta.