Portable computing is now totally ubiquitous. There's a good chance you are listening to this episode on a tiny portable computer right now. But where did it all come from? As it turns out the first portable computer was designed all the way back in 1972. This machine, the DynaBook, only ever existed on paper. Despite that handicap, in the coming years it would inspire a huge shift in both personal and portable computing.

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Important dates in this episode:

1972: DynaBook designed by Alan Kay

1976: NoteTaker project starts

1982: GRiD Compass released