I'm thinking of purchasing an ibook clamshell. A tangerine 300 mhz model. I'm only going to use it for writing while on the road, so it doesn't need to be a screaming fast machine. However, I don't want it to be slow as a turtle.. Does anyone know how much memory is supported on the mobo? I'm thinking 512mb, but just to make sure. Also, what type of RAM is supported if I want to upgrade? Thanks for your help!