In addition to models made by Sega, several alternate models were made by other companies, such as Majesco, AtGames, JVC, Pioneer Corporation, Amstrad, and Aiwa.
Кроме компании "Sega", созданием вариаций занимались и сторонние разработчики: "Majesco", "AtGames", "JVC", "Pioneer Corporation", Amstrad и "Aiwa".