Old iMacs can be bought for under $100 and used as affordable, high-quality external monitors. Buying a used iMac and using Duet Display can mimic the Apple Studio Display experience at a fraction ...

Apple then begun deprecating the functionality with macOS Mojave. If you had a 2014 iMac or prior, it couldn’t run Mojave and serve as an external display. It then fully killed the feature with macOS ...