As a whole computer system that fits on our wrists, the Apple Watch already appears like something from a sci-fi book, however a new video from software application designer Nick Lee demonstrates just how far computing has been available in the last twenty years.

Lee’s hacked an Apple Watch running watchOS 2 to run a port of a 20-year-old Macintosh OS, System 7.5.5, using the Mini vMac Macintosh emulator.

When System 7.5.5 was launched in 1996, it needed a complete PowerPC-based Mac to run, and in their tiniest incarnation, those machines were clunky, heavy, and quite far from the portable devices that we have now. Today, that exact same os can operate on a small 38mm to 42mm wrist-worn computer.

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