Before we can get into some serious retro gaming on MacOS/OSX we first need to install some software. Here at MacRetro we predominantly use four emulators for most of our gaming.
Security & Privacy Settings
Users of more recent versions of MacOS/OSX (Sierra onwards) by default are only allowed to open downloaded applications from the App Store, or from identified developers. To run your emulators for the first time you will need to disable this. Open up terminal, in our version (Sierra) the necessary code to enter to override this setting is:
sudo spctl --master-disable
followed by the return key, and then by your password at the prompt. After which you will then be able to authorise each emulator in the Security & Privacy settings section of System Preferences. You only need to do this this first time you launch each emulator.