The J-Cart was a special cartridge developed by Codemasters

Codemasters

The Codemasters Software Company Limited, or Codemasters is a British video game developer founded by Richard and David Darling in 1986...

 for the Sega Mega Drive (Sega Genesis)

Sega Mega Drive

The Sega Genesis is a fourth-generation video game console developed and produced by Sega. It was originally released in Japan in 1988 as , then in North America in 1989 as Sega Genesis, and in Europe, Australia and other PAL regions in 1990 as Mega Drive. The reason for the two names is that...

 console. It held not only the game data but also came with two additional gamepad

Gamepad

A gamepad , is a type of game controller held in two hands, where the digits are used to provide input. Gamepads generally feature a set of action buttons handled with the right thumb and a direction controller handled with the left...

 ports. This effectively allowed four players to play simultaneously without any adapters

Multitap

A multitap is a video game console peripheral that increases the number of controller ports available to the player, allowing additional controllers to be used in play...

 or workarounds. Its initial release was set in early 1994

1994 in video gaming

-Events:*Nintendo calls this year "1994: The Year of the Cartridge".*Nintendo Australia Pty. Ltd, the Australian subsidiary of Nintendo Co., Ltd is established and opened by Hiroshi Yamauchi and effectively ends Mattel Australia's distribution of Nintendo's products throughout Australia.*"Project...

.

Micro Machines 2: Turbo Tournament also allowed up to eight players to play simultaneously using up to four gamepads, each player using only the D-pad

D-pad

A D-pad is a flat, usually thumb-operated directional control with one button on each point, found on nearly all modern video game console gamepads, game controllers, on the remote control units of some television and DVD players, and smart phones...

 or face buttons.

The J-Cart came relatively late in the life cycle of the console. Thus the number of games that support the J-Cart was limited, and all of them came from Codemasters.

Games

• Pete Sampras Tennis
  Pete Sampras Tennis
  Pete Sampras Tennis was the first game of three of this celebrity-endorsed tennis video game series, released by British software house Codemasters...
  
  
• Pete Sampras Tennis '96
  Pete Sampras Tennis '96
  Sampras Tennis 96 is a 1995 video game developed by Codemasters. The video game is the sequel to Pete Sampras Tennis and was followed by Pete Sampras Tennis '97-Features:...
  
  
• Micro Machines 2: Turbo Tournament
• Micro Machines 96
• Micro Machines Military
• Super Skidmarks
  Super Skidmarks
  Super Skidmarks is a racing video game developed by Acid Software and released in 1995. The game is the sequel to Skidmarks and as such was also termed Skidmarks 2 and Super Skidmarks 2 by commentators. The game features “minimally realistic” action viewed from an isometric perspective as well as...