https://www.xda-developers.com/25-years-ago-first-imac/
The first iMac launched to the public on Aug. 15, 1998, and in those 25 years, the iMac shaped Apple in more ways than one
His family also got the first iMac running OS X, and that was such a beauty to behold. I mean, maybe the design wasn't as colorful or iconic as the G4 generation, but man that OS was sweet.
You could upgrade to OS X on the colorful ones, I installed 10.0 on release day and got an OS X tee shirt and wore it to school because what was I thinking. It was fun times. I remember having to open Emacs to make some system change to better support IRC in Ircle and I had no idea what I was doing but it was Unixy!
It did. I checked their opensource repo and it looks like they removed it in 10.15. The shell was also tcsh at the time and the terminal, I think, defaulted to black on white. Everything about it was unfamiliar to a Mac user, it felt like an old library Dynix system.