Yeah, what he said. That lot comes with a system 2.0 card, so you can play the regular cd rom games but not Super CDROM games. They aren't very expensive.
The Arcade Card does the same thing, but has a tad more ram so you can play Arcade Card games. In my opinion, the only worthwhile game that uses the Arcade Card is Sapphire. The Arcade Card for non-duo systems are pretty expensive though, so I wouldn't bother unless you are obsessed with Sapphire.