Was trying to find information regarding the RAM for my particular model of G4 Powerbook because I planned to upgrade the puny amount of RAM (512MB in total, 256MB soldered) that came with the machine, and happened on the following DIY sites. Very helpful, I must say. As an example, here are illustrated guides for upgrading the RAM.

  1. Steps for RAM upgrade from ifixit
  2. Another guide from Macinstruct
  3. All you’d want to know about RAM for Powerbooks