guess I should have mentioned the memory base before I bought one. I did pick up a tennokoe card, how much do those things hold? Also, I haven't been able to find a complete list of games that support the mb-128, does anyone know? all I found was this http://www.pcenginefx.com/forums/index.php?topic=615.0 
It has 4 save banks, so you basically make an image of the memory and it saves it.  Then you can load the image back.  Theres no loading a certain file back to the system.