Simulate having a certain GBA game in Slot 2

DS GBA GameCube Meta Quest Nintendo 64 PS1 PS2 PS3 In the original title, you would need to assign the ocarina to an item slot

sav file directly into DraStic's slot2 folder I don't have to bother with renaming because the files come directly from the folder that my GBA

ds with gameboy slot 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

ds99 slot sav file directly into DraStic's slot2 folder I don't have to bother with renaming because the files come directly from the folder that my GBA