Nice. The Powerbook 500 series is a great bunch of notebooks. I was lucky enough to get a maxed out 540c with 36mb of RAM (the max). It gets online perfectly under System 7.6 (have not updated to 7.6.1 yet). I use a Focus brand AAUI adapter, and iCab 2.9.9.

I used to run Mac OS 8.1 on it. THAT was an exercise in patience; even with the 36mb of RAM.

Now I have to rebuild the batteries, and get it going, it will make a great portable machine.