I picked up a Saturn with Panzer Dragoon Saga off of ebay and I have a problem with it. It came with an interact memory cart as well as a couple of internal batteries. When I save the game it saves to the internal battery fine, but if I try to save to the cart it just flashes and says save complete but it doesn't create a save block. A comic store near me had the same interact memory cart so I bought that one but it still won't save. Is there some problem with that type of memory cart, should I buy an official Sega one off ebay. Or does it sound like there is a problem with the system?