HP-22S

Not to be confused with HP-22.

HP-22S
HP-22S
TypeScientific
ManufacturerHewlett-Packard
Introduced1988
Calculator
Entry modeInfix
Display typeCharacter-based dot-matrix display
Display size1 line, 12 characters
CPU
ProcessorHP Saturn (Sacajawea)
Frequency640 kHz
Programming
Firmware memory16 KB of ROM
Other
Power supply3×1.5V button cell batteries (Panasonic LR44, Duracell PX76A/675A or Energizer 357/303)
Dimensions148×80×15mm

The HP-22S is an electronic calculator from the Hewlett-Packard company which is algebraic and scientific. This calculator is comparable to the HP-32S. A solver was included instead of programming. It had the same constraints as the 32S, lacking enough RAM for serious use. Functions available include TVM and unit conversions. Only single letter variable names are allowed. Marketed as a student calculator, the 22S uses infix notation rather than the reverse polish notation used on some higher-end HP calculators of the same era.

Features

The HP-22S includes many of the typical features found in most scientific calculators:

  • Trigonometric and hyperbolic functions
  • Polar/rectangular coordinate conversion
  • Probability functions and statistical calculators (mean and standard deviation, weighted mean, linear regression)
  • Unit and base conversions

Hardware

The 22S has the same physical form factor and 37-key keypad as other models in the Pioneer series. Introduced simultaneously with the HP-32S,[1] it is based on the same hardware, with a single line character-based dot matrix display that can display both numerical and alphabetical characters. The CPU is an HP Saturn Sacajawea chip clocked at 640 kHz, making it slower than its higher-spec cousin, the HP-27S.[2]

Equation solving and equation library

HP's advertising for the 22S emphasized the equation solver and library of built-in equations.[3] This feature allows a multi-variable equation to be entered by the user, and the equation solved for a particular unknown variable given the value of other variables.

For convenience the 22S includes a set of common mathematical and scientific formulae, including:

See also

References

  1. ^ "Handheld Calculators". Educational Digest. Zanny Limited, Canada. November 1988. Retrieved 2022-02-16.
  2. ^ van der Sanden, Kees. "The Saturn processor". My Hewlett Packard calculator collection. Kees van der Sanden. Retrieved 2022-02-16.
  3. ^ "New Achievers in Heavy Metal, Swing, Blues and Motown". Memphis State University Directory of Classes. Memphis State University. Spring 1989. Retrieved 2022-02-16.
  • HP-22S on MyCalcDB (database about 1970s and 1980s pocket calculators)


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