Upgrading the Memory on a DreamCast?

dknight asks: "Ok, a friend of mine recently has his computer die on him. Rather than go out and buy a computer, we thought we'd try converting his DreamCast to fit the bill. We've got the keyboard and mouse, and now have Linux running on it successfully(we're working on getting the network adapter). The problem we're running into, however, is that it's REALLY painfully slow. I'm figuring this is due to the meager 16 Megs of RAM it comes with. My question is: Is it possible to upgrade the RAM on a DreamCast? Has anyone else attempted this feat?" I highly doubt this is possible, but if this can be done, this might breathe new life into those unused DC consoles that are lying around.