The Basilisk II emulator can be used to run old versions of Mac OS 8 and System 7 on a modern Mac. Here's how to get started using it. Before macOS and OS X, there was Mac OS 9, and before that were ...

I'm a bit confuzeled as to the specifics of the Mac OS ROM file in OS 9. It is my understanding that prior to 9 (or maybe earlier) the ROM on the chip was no longer used by the OS, but rather it uses ...