The Nintendo DS is backwards compatible with Game Boy Advance (GBA) cartridges. The smaller Nintendo DS game cards fit into Slot 1 on the top of the system, while Game Boy Advance games fit into Slot 2 on the bottom of the system. The Nintendo DS is not compatible with games for the Game Boy Color and the original Game Boy, due to a slightly different form factor, voltage requirements, and the absence of the compatibility mode. http://playstationclubpk.com/nds_features.html The Sharp Z80 compatible processor used in the older systems is still included, and indeed necessary for some GBA games that use the older sound hardware.
The handheld does not have a port for the Game Boy Advance Link Cable, so multiplayer or GameCube-Game Boy Advance link-up modes are not available in Game Boy Advance titles. Only single player mode is supported on the Nintendo DS. Do you love your ds or do you want to sell it for something else?
The Nintendo DS only uses one screen when playing Game Boy Advance games. The user can configure the system to use either the top or bottom screen by default. The games are displayed within a black border on the screen, due to the slightly different screen resolution between the two systems (256 × 192 px (approx. 0.05 megapixels) for the Nintendo DS, and 240 × 160 px (approx. 0.04 megapixels) for the Game Boy Advance).
Nintendo DS games inserted into Slot 1 are able to detect the presence of specific Game Boy Advance games in Slot 2. In many such games, either stated in the game during gameplay or mostly explained in the games’ instruction manuals, extra content can be unlocked or added by starting the Nintendo DS game with the appropriate Game Boy Advance game inserted. Some of the content can stay permanently, even when the GBA game has been removed after content has been added.
Additionally, Slot 2 can be used to house expansion paks, such as the Rumble Pak, the Nintendo DS Memory Expansion Pak, and the Guitar Grip for the Guitar Hero: On Tour series. The DSi does not contain a GBA slot.
