Sega Card

The Card Catcher peripheral allows for use of the cards with the SG-1000. A limited edition version of the Card Catcher is bundled with two games, Zoom 909 and Dragon Wang. The games were also sold separately from the Card Catcher and allowed players to send away for a free adapter at the time.[3]

The original SG-1000 models (SG-1000 and SG-1000 II) and the SC-3000 series (SC-3000 and SC-3000H), along with compatible hardware (the Othello Multivision Series and the Pioneer SD-G5) do not have built-in card slots, as they were released before the original My Card. Instead, they require the Card Catcher to be placed in the cartridge slot to use card-based games.

Card releases are distinguished from cartridge releases by their part numbers. Standard SG-1000 releases sport a 4-digit number, G-10XX, with a unique two-digit number at the end. Card releases only have a two digit number, C-XX. The numbering from the cartridge releases was continued with the card releases though, with subsequent card releases being given two-digit numbers that are higher than those from cartridge releases. Games released both on cartridges and cards retain the unique two digit number with the "10" removed from the part number (e.g. The cartridge version of Golf Champion is given the number G-1005 while the My Card release was given the number C-05).

The successor to the SG-1000, the Sega Mark III was released in October 1985 and is backward compatible with both SG-1000 cartridges and My Cards. The subsequent international version of the Mark III, the Master System retains compatibility with My Card software, though Japanese software is incompatible on non-Japanese hardware. However, the Power Base Converter, which allows Master System software to be run on Sega's Mega Drive/Genesis only retains compatibility with Mark III/Master System My Cards.

In New Zealand, Grandstand Leisure Limited released both the Card Catcher and the following My Card games:

The successor to the SG-1000 card format is the Mark III My Card. With the October 1985 release of the Sega Mark III, all games were initially available as My Cards. But with 1986's arrival of "Gold Cartridge" branded releases, Sega started transitioning to the cartridge as the primary distribution media. By 1987, games had stopped being released in the My Card Mark III format.

Outside Japan, My Card Mark III was released under the name "Sega Card", with the 1986 release of the Western version of Mark III, the Master System. Subsequent versions of the Master System, including the "Master System II" are missing the card slot. The Power Base Converter allows Sega Cards and My Cards to be used with the Mega Drive/Genesis. The card format is mostly region locked, preventing non-Japanese hardware from playing Japanese My Cards. This is not the case for Japanese hardware. However, Woody Pop is the only Japanese card release compatible with any system capable of playing My Cards/Sega Cards.

In 1985, Sega released another version of the card in Japan called the My Card EP (short for EPROM, or UV EPROM), a rewritable version of the format. Sega promoted the My Card EP using flyers and newspaper advertisements and pilot tested it at Tokyo's Tamagawa Takashimaya Futakotamagawa.

Dealers were to install EPROM rewriting machines at retail locations, while users would bring their card and write other games onto it. Players were charged a fee that was lower than that of a retail game. Cards initially cost 5000 yen each, while rewrites on the card cost 1800 yen. The back of the cards did not have the silver sticker from standard My Cards.

The format was not commercially successful and was abandoned. Since then, the cards are quite rare and have fetched high prices at auction.

Games were released onto the EP format at the same time as they were released onto standard My Cards. New My Card EPs came with either Dragon Wang or Star Jacker pre-written on the card, with the below titles available for rewriting.