A developer was able to start up the nearly 20-year-old Mac OS 7.5.5 (nÃ©e System 7) onto his Apple Watch running the latest WatchOS 2 update, exemplifying the extent to which computing has evolved over the past two decades.

Enlisting the help of Mini vMac, Developer Nick Lee was able to get Mac OS 7.5.5 up and running on his Apple Watch loaded with Apple's latest watchOS 2 software.

The impressive feat, first spotted by MacRumors, is accomplished entirely on Apple Watch with relatively snappy performance despite what is today considered a low-power system-in-package design.

Along with raw processing power, Apple's S1 integrated chip design packs in a full communications array including Wi-Fi and Bluetooth technology, NFC hardware, accelerometer, audio package, touch controller, wireless induction controller and more.