Ok, a few weeks ago I bought a bundle that had one of these Interact Memory Card Plus things in it for the Sega Saturn. I had never seen one before, but I still didn't think about it much. Well today I went to play the Tomb Raider game from the box of saturn stuff, and noticed this thing again. So now I'm wondering what exactly does it do? I know it goes into the cartridge slot of the Saturn, but how can I tell if its working when I turn on the system? What are the main purposes of it? Were many of these things built? Any information would be nice. Thank you very much, JT