What does the second game slot do?

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GBA games are loaded through the GBA slot, it's not possible for the DS to do it through the DS slot You would need a slot 2 loader, as the

The Neon Advance plays original GameBoy Advance carts, and retains the original DS slot My favorite has to be this one, which features a Browse Pokemon Yellow Cheats for Gameboy Color, Includes the most popularly Pokemon DS Rom Hacks · Completed Pokemon ROM Hacks · Fan Made Pokemon Games

online slot booking This is a little adapter to store a loose Nintendo DS cartridge in the GBA accessory slot of a DS Game Case Also fits 3DS cartridges  About this item I'm happy to introduce a brand new mod for the original DSgameboy Macro XLGameboy Advance Its a GBA slot cover with built in LED's in a