Hand-held Calculators

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Hewlett-Packard HP-65

Hewlett-Packard HP-65

Hewlett-Packard HP-65

Distinctive features: The first hand-held, programmable calculator.

Technical details:
Display uses scientific notation, 10 digits mantissa, 2 digits exponent, red LED.

Scientific, programmable, with 100 program steps.

3.6v (3x AA rechargeable cells in a battery pack).

80 x 149 x 36 mm (3.2" x 5.9" x 1.4").

Launched in January 1974.

Made in USA.

Price US$795.

This was the first hand-held programmable calculator. Programs can be stored on magnetic cards, see photographs below, though these had been used previously with desktop programmable calculators. Program libraries for performing calculations for various disciplines could be purchased from HP.

With program card
With program card

Above, "Compound Interest" program about to be read from the magnetic card. The card is driven through the calculator by a tiny motor inside, from right to left.

Left, after the program has been read in, the card is inserted in a slot below the display and there provides the legends for the keys A to E.

Hand-held Calculators

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2017  except where noted otherwise.