Huh, that's certainly a more fundamental reason that the NES frame is that length...! I wonder if people involved with early film and video had a lot of 60:1 g

Huh, that's certainly a more fundamental reason that the NES frame is that length...! I wonder if people involved with early film and video had a lot of 60:1 gearing available because of clocks or something (or just thought it was a very intuitive division to use).