The Game Boy Player reference article from the English Wikipedia on 24-Apr-2004
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Game Boy Player

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The Game Boy Player is a device for the Nintendo GameCube which allows the users to play Game Boy cartridges. It is made by Nintendo and is actually useless standalone. It connects via an i/o port at the bottom of the GameCube and allows users to play Game Boy cartridges fullscreen on a television. The hardware on the Game Boy Player is actually almost the as that of a Game Boy Advance.