It’s been 20 years since Apple discontinued the iMac G4, a unique computer with a funky half-globe base and a flatscreen LCD on a fancy hinge and adjustable arm. In its unaltered state, it’s a nice-to-look-at, nostalgic relic that’s unusable in modern contexts. I coveted it and never got to own one at the time, but thanks to Juicy Crumb’s DockLite G4, I’m using this classic iMac every day as an external monitor.

The DockLite G4 is a drop-in replacement motherboard for the iMac…