How can I read/write saves to original DS carts? I currently have an M3 and an R4 slot 1 carts, but would like to be able to read and write saves of original carts. Is there some kind of program I can run from my M3 or R4 (I believe hearing once that action replay could read and write saves), or would I have to buy something? If I have to buy something, how much would that cost? Thanks!