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"It is change ... that is the dominant factor in society today... the world as it will be. This means that ... every man must take on a science fictional way of thinking.""
- Isaac Asimov

Pocket Computer  
  A pocket-sized computer.  

I'm not sure when the first reference to a pocket-sized computer was; this novel was published in 1974. At that time, the smallest computer was probably a mini-computer. One of these machines plus a drum memory for storage were about the size of a small washer and dryer.

"Sinclair wants to do some outside work while we're dirtside." He took out his pocket computer and wrote quickly with the attached stylus. "Let's see, we're about one and a half billion kilometers from New Scotland, that's uh, make it a hundred hours to turnover. About two hundred hours' travel time, plus what we spend on Dagda...
From The Mote in God's Eye, by Larry Niven (w/J. Pournelle).
Published by Simon & Schuster in 1974
Additional resources -

Apparently, they also included some sort of wireless link, because (elsewhere in the novel) it says that, when the officers were off duty, they "could always be reached on their pocket computers."

Another early mention of a small "pocket computer" or note-taking device with some mathematical functionality built-in is the calculator pad from Foundation by Isaac Asimov.

Asimov also mentioned a "pocket-computer" in his 1975 story Point of View.

As far as I know, the first pocket computer sold as such was the TRS-80 PC-1.

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Additional resources:
  More Ideas and Technology from The Mote in God's Eye
  More Ideas and Technology by Larry Niven (w/J. Pournelle)
  Tech news articles related to The Mote in God's Eye
  Tech news articles related to works by Larry Niven (w/J. Pournelle)

Pocket Computer-related news articles:
  - HTC Magic Smartphone At Google IO

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