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"...the elements of cyberpunk have dissolved into the whole SF genre, so it’s hard to find anyone writing who doesn’t owe serious debts to Gibson and his crew."
- Richard Morgan

Pocket Projector  
  A personal device for replaying media.  

"Yes I've heard that sort of talk; Seldon, Second Empire, and so on. They put kids to sleep at night with the stuff. The young squirts curl up in the spare room with their pocket projectors and suck up Seldon thrillers. But it's strictly non-adult. Non-intelligent adult anyway." The trader shook his head.
From Foundation and Empire, by Isaac Asimov.
Published by Doubleday in 1952
Additional resources -

One of the issues that fascinates me about this idea is the question of personal playback devices that were both small enough to fit in a pocket and were inexpensive enough to be given to children. In the modern era, we're used to the idea of the Walkman and the Nintendo game device, but what was available in the 1950's?

The only example I can think of is the Viewmaster, a simple mechanical device that used a circular piece of cardboard with tiny photographs for viewing. The Viewmaster was introduced in 1939.

Here's a sample commercial from the 1980's, thanks to the magic of Youtube:

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Additional resources:
  More Ideas and Technology from Foundation and Empire
  More Ideas and Technology by Isaac Asimov
  Tech news articles related to Foundation and Empire
  Tech news articles related to works by Isaac Asimov

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