Datach : SD Gundam, Gundam Wars

Gundam Wars is a game for the Famicom that utilizes the Datach Joint ROM System accessory. Basically, this device reads barcodes from special cards that come with the game, with the character/item data being written onto these cards. This is the only way to play the game, since you must select a character or item by swiping its card. Aside from that interesting bit of innovation, SD Gundam Wars is a strategy/action game of sorts. The battles are automatic so you don't really control anything aside from scanning in your characters at the beginning, and scanning items at the start of each turn.