The Epson HX-20 (also known as the HC-20) is regarded by some as the first laptop computer, announced in November 1981, but conceived nearly a year before by Seiko, who were handed the patent for it.
Lack of software and distribution meant it was not sold widely until 1983.
Hailed by BusinessWeek magazine as the "fourth revolution in personal computing", it had a rudamentary screen of just 120x32 lines, and could be connected to a printer via an expansion port.
It has two Hitachi processors, and 16KB of expandable RAM, and runs on Epson basic interpreter.
Today the machine can still run, although the original Ni Cad batteries need replacing.
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This exhibit has a reference ID of CH501. Please quote this reference ID in any communication with the Centre for Computing History.
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