Yes! A 450MHz b&w G3 with 256MB RAM, 100GB total HD storage, ADB keyboard and mouse, and OS 10.4.9 is still the main Mac in use at my parents' house!

I would love to own one solely because I want to use my ADB keyboards.
That does work in OS X right?

Click to expand...

Yes, all versions. (except for 10.5.x, I believe.)