HP-65

The HP -65 was the first programmable pocket calculator in the world. It was introduced in 1974 by Hewlett -Packard and was regarded as an electronic marvel.

He had nine storage registers and program memory for 100 key commands. He also had a magnetic card reader / writer, whose cards were about the size of a gum strip. How he used almost all subsequent HP calculators the Reverse Polish Notation (RPN ) at the input of numbers to use the space effectively. This system does not require any conventional = button, but instead has an Enter button to set the operand to the four levels full stack, and operator keys to link them.

The HP -65 and had only a very few program editing and the uppermost register T in the stack was overwritten when the user, for example, performed a trigonometric function. Since this was so documented in the manual, it was not a mistake but shows how economically you then had to deal with the memory locations.

Bill Hewlett's intention was that the computer should fit in a pants pocket. That's one of the reasons for the tapered shape of the calculator. The magnetic strip was inserted at the thick end of the computer under the LED display.

The description of the programs for the HP -65 was very extensive and included hundreds of applications in various fields such as solutions of differential equations, market price calculations or statistics programs. Particularly among engineers and scientists, but also among business people, professors, teachers and students of the HP -65 had many buyers and trailers.

During the 1975 Apollo -Soyuz project, the HP -65, the first programmable pocket calculator was in space.

In addition to the HP -65 Hewlett -Packard introduced a whole series of famous calculators ago:

  • HP -35 (first calculator of the world with scientific functions )
  • HP -01 (first wristwatch - calculator)
  • HP -55 (first programmable scientific calculator with quartz timer)
  • HP -25 ( programmable scientific low-cost calculator)
  • HP -41C (first Calculators with alphanumeric display )
  • HP -12C ( best-selling financial calculator)
  • HP -48 ( successor to the HP -41 of 1989. Yet available in 2006 as HP- 49G and HP -50G )

Trivia

Steve Wozniak sold his 1976 HP -65 calculator to its share of the start-up capital of the company contributing Apple.

Programmable calculator Hewlett-Packard Magnetic cards HP-35 HP-25 HP-48 series
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