A number of bootleg clones were created during its lifespan .
In addition to models made by Sega , alternate models were made by other companies , such as Majesco Entertainment , AtGames , JVC , Pioneer Corporation , Amstrad , and Aiwa .
A number of bootleg clones were created during Sega 's lifespan .
In addition to models made by Sega , alternate models were made by other companies , such as Majesco Entertainment , AtGames , JVC , Pioneer Corporation , Amstrad , and Aiwa .