I am doing some general research on modding the Nintendo DS and I've come across so many options, I don't know where to start... One of the main questions I have is why is there a slot 2 cart nessassary to play GBA games? Can you run GBA games without it? I've seen products that make me wonder what the slot 2 is nessassary for... There is this combo that is offered by M3 and also an all in one type. They both say that the have like 256mbit of memory or something. So, am I limited to that for my game roms or is that space reserved for apps and my games are saved in a different location? The slot 2 cart says "movie player." so there is not a movie player with a normal slot 1 M3/R4 mod aswell? It's just weird... I'm comeing from the ps2/psp mod world. I'm familiar with boot disks and I figured that the M3/R4 mods where simple boot devices. It looks a little more complicated that what I had thought.