Playing GBA using M3 DS Simply as a passme

I would like to play GBA games on DS. I already have the M3 DS Simply for playing DS Games. From what I have read it seems that the M3 DS also acts as a passme so all I would need is a slot 2 device such as the Supercard SD. Am I correct in this assumption and if not could anyone let me know what else I would need?

Thanks

 

Just to play GBA games you don't need a "passme" device. But yes this does work, nice thing about it is say you want to put almost a full gig of mp3's on a slot2 device, no games. You can install moonshell onto it and use the rest of the entire card for your music collection (just what I've done).