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  • Filling in Blanks: HP Magnetic Program Cards

Filling in Blanks: HP Magnetic Program Cards

Front of carrying case of blank magnetic calculator program cards. Enlarge
Interior page of carrying case for blank magnetic calculator program cards. Enlarge
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Date: 1970s–1980s

Since semiconductor memory was still in development to allow computers to retain instructions without a continuous power source, early calculators received their instructions through special magnetic cards that users could program, then insert and change out as desired. This would continue until Hewlett-Packard began offering an electronic memory option with the introduction of the C series in 1976.

Tags: 1970s • 1980s

( C ) HPCA

 
A Superstar Product: The HP 65 Calculator
 
 
1972-1976: A Series of Calculators
 
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