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.