UTM is a cross-platform emulator that allows you to run macOS, Windows, or Linux. Here's how to use it to run very old versions of Apple's Mac operating system. But there's another great free OS ...

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 ...