- Sega SG-1000: Available in limited markets
- Sega SG-1000 II: Updated version of the SG-1000, includes a keyboard
- Sega Mark III: Available in limited markets (Japan/Australia/New Zealand)
- Sega SC-3000: A computer version of the SG-1000
- Sega SC-3000H: An updated version with more RAM and keyboard (the original keyboard was of the low-end membrane type).
- Sega Master System: Essentially the SG-1000 Mark III only with a different name and a few minor adjustments
- Sega Mega Drive: Known as the Sega Genesis in North America due to another company owning the Mega Drive trademark in that region.
- Sega Mega-CD: Known simply as the Sega CD for the North American market, it allowed CD based games as well as Audio CDs to be played on the Mega Drive.
- Sega 32X: Hardware update to the Mega Drive allowing 32 bit based games to be played
- Sega Multi-Mega: a portable CD player with the functionalities of a Sega Mega Drive and Sega Mega CD. Following the Mega ... brands, its name was Multi-Mega in most of the world and Genesis CDX in North America.
- Sega TeraDrive: A 16-bit PC with an integrated Mega Drive. Came with a Software Development Kit to allow creation of Mega Drive games. The system was only released in Japan.
- Sega Neptune: A Sega Mega Drive/32X hybrid. It never passed the prototype stage. Only two empty cases are known to exist.
- Sega Saturn: True 32-bit console
- Sega Dreamcast: First 128 bit (sixth generation) console, also Sega's last console.
- Sega Pico: an educational gaming system.
- Sega Advanced Pico Beena: Successor of the Sega Pico
- Amstrad Mega PC: Although not actually produced by Sega themselves, the Mega PC is Amstrad's version of the TeraDrive for European and Australian markets, thus includes electronics for Sega's Mega Drive console built-in.
- Game Gear: Sega’s 8-bit handheld
- Sega Nomad: Sega’s Mega Drive, in a portable unit
- Sega VMU: Memory Card for Dreamcast, also able to download games
- Sega Mega Jet: A Mega Drive unit, originally only available on Japan Airlines flights
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