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Casio fx-702p from 1981 - Casio's first pocket computer - YouTube
Charlie Stross on Twitter: "I still own a (working!) Casio FX-702P (and manuals, case, and software library!), but alas no printer, tape interface, or massive 16Kb RAM pack. Maybe I should upgrade
Casio FX-702P - YouTube
Eddie's Math and Calculator Blog: Retro Review Casio fx-702P