I had the chance to boot the 575. It has a 80mb hard drive, and 20mb of RAM. That means a 16mb stick and the 4mb on board. I can't get it to boot from my burned 7.6 CD, so I am going to try and burn a fresh copy.

It does have 7.6.1 on it, but appears to have personal data on it, so as a rule, I always performa (HA!) clean install on any new old mac.

Unless I should go for 7.5.5 on this machine...