Sanritsu

Company: Sanritsu Denki Co., Ltd. (サンリツ電気株式会社)
Country: Japan
Established: 1973
Successor: SIMS (informally)

Sanritsu developed on contract for Sega during the 1980s. The two companies later invested in a new developer, SIMS that continued on much of the similar Master System porting that Sanritsu had been undertaking.