Spike Spiegel said:
So two real answers and two fake ones. What does GBA do with the second screen when you play those old games? Also, is Mario 64 (or whatever) as good as it was on N64, or is it... less... because of the lack of D-pad? Thanks again!
It's just not in use (i.e. black). You can set it to use the top or bottom screen, but I would recommend using the top, as it seems to be of a higher quality than the bottom one.
Honestly, I've never really played the original Super Mario 64 much. I can still tell you though, this game was obviously designed with an analog controller in mind. Using the d-pad is certainly adequate, but it can take a little getting used to. There's also a mode where you used the touch screen like an analog stick, but I don't really like it a whole lot.
Edit: Also, take into account that the DS can't play original GB or GBC games, if you plan on selling your SP.