I had the same notebook.
PowerBook G4 15" 1.5GHz 80GB but with 2GB of RAM
Ran Leopard wonderfully, I really really miss that machine. My first Mac. I'll never have the same connection with my new MBP.
Buy the RAM upgrades, they're super cheap these days and do a clean install and you'll be happy. I was fine with my stock 80GB.
PowerBook G4 15" 1.5GHz 80GB but with 2GB of RAM
Ran Leopard wonderfully, I really really miss that machine. My first Mac. I'll never have the same connection with my new MBP.
Buy the RAM upgrades, they're super cheap these days and do a clean install and you'll be happy. I was fine with my stock 80GB.