ElCapitan
The Knowledge Navigator movie predated the Newton launch with almost 6 years (produced in 1987), and was the inspiration for the Newton and later the iPad, that was first implemented as the iPhone.
If you watch the entire movie, there are functionality there that even the modern day combination of iPad and Siri can't perform.
I worked in Apple product management at the time of the Newton launch, and had it in hand before it was presented to the public. We had very high hopes for the success of the little machine, but in practical use it had a number of shortcomings that Apple only was able to master with iOS.
