* Seikosha GP500A - Was offered as '''Seikosha GP500A''' for general purpose (centronics port)
* Seikosha GP500AS - Was offered as '''Seikosha GP500AS''' for general purpose (serial rs232 port)
* Seikosha GP500M-2 - Was offered as '''Amstrad DMP1''' for CPC (centronics 36pin port)* Seikosha GP500VC - Was offered as '''Commodore MPS-801''' for VIC20 and C64 (commodore 6pin serial port)
* Seikosha GP500AT-1 - Was offered as '''Atari 1029''' for Atari XL (dual 13pin port)