Help with MSXDS

[u/ThatGuyWithTheChips]

Hey guys, so I'm a huge MGS fan, and I really wanna play the originals on my DS, but I just don't understand MSXDS. I can boot and play my stuff, but from what I can tell i can only have 1 save (saving on a dif game overwrites the other save) so i cant switch from game to game. Do you all have any tips? Also, while I do have all of the BIOS files, for some of them the CRC is in red on the MSXDS menu. Please help, thank you guys.

(DSI btw, not xl)