This is the result of my weekend project. I started out working on a year old project to create bootable images for classic OS's for my RPi400. I started with MacOS 9, back when the O/S had personality.
I had limited success getting it to run on the Pi. While troubleshooting I stumbled on QEMU, and it has the ability to do exactly what I wanted on the Pi, but on my Mac, even better as it becomes immediately accessible. After spending several hours getting it installed, network working with the host O/S, and printer setup (hint, make sure your network printer is actually turned on! Doh!), I finally got a nice booting Mac OS 9.2.1 system that connects to the internet and can print to my network prnter.
It emulates a 1 Ghz PowerPC, and feels just as speedy as the 900Mhz G4 I had in the early 00's. I'm trying to document all the steps I did to make it happen, but sadly I didnt track all the notes, so I may not.
The one thing I really love about this O/S, Window Shades. I wish they would bring that back.
Finally found a good 9.2.2 ISO and have it upgraded and using a wider resolution. The 9pt font used in some of the settings is SMALL on this Retina display. Updated screenshot showing widescreen, emulated CPU and speed, small font, and my favorite thing I wish they would bring back - Window Shades in action.
Not sure a Mac that old could pull it off at 900 Mhz. Maybe. FWIW, my MacBook Pro is an M1 Max.