Anybody knows why there is gba slot in ds boxes?

My goal is to reverse engineer the protocol, but I have no idea where to even start Specifically: How does the DS game know which GBA game is

Browse Pokemon Yellow Cheats for Gameboy Color, Includes the most popularly Pokemon DS Rom Hacks · Completed Pokemon ROM Hacks · Fan Made Pokemon Games

dsobet slot 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

ds slot If I wanted to grab more DS cases from Nintendo to say backfill my GBA collection, would they be Eco-crap or not? Has anyone ordered recently ?