3 ms·The original Apple TV ran a modified OS X 10.4. Have one in my basement. :)by kayodelycaon 3y agoThe original Apple TV ran a modified OS X 10.4. Have one in my basement. :)dagmx 3y agoAnd to a degree, the latest one runs a modified iOS which is a modified macOS if you go back far enough.mattl 3y agoEverything they make runs OPENSTEP, basically.