I highly recommend not soldering to the 64 pin chip unless you are very confident. I have a broken Saturn at home which can testify to this. I took my second one down to the local electrics place and they did it for Â£5. I wish I'd done that in the first place.
MyName is you now have a working modded 64pin saturn can you confirm that it is the 8th pin down on left side of the chip (if you are looking at the saturn side on of course) so that when I go pick up another saturn I can make sure they solder onto the correct chip?
JonnyCasino, I got a new Saturn but when it came it turned out to be the 32 pin one (and in much better condition than my old one, only cost Â£4!!), so I can't help you with it. I remember reading somewhere that so long as it's soldered cleanly it will work on no.8 or no.56 but this might be untrue, I don't know. Sorry..
No probs Im gonna go to the shop and say that Im definitely buying 1, which I am and if itd be at possible for me to me to look inside the ones they have first since they are all 2nd hand Im hoping that'll be ok.