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  2. HP-55 - Wikipedia

    en.wikipedia.org/wiki/HP-55

    The data format used by the stop-watch consisted of a combination of units (Hours, Minutes and Seconds), but the HP-55 featured a special conversion function to convert between this format and a pure unit (Hours). Because of this, data from the stop-watch could easily be used right away in calculations.

  3. HP calculators - Wikipedia

    en.wikipedia.org/wiki/HP_calculators

    MyCalcDB HP calculators list. Calc Pages Articles and programs for classic HP calculators; Programmable Calculators Pictures, specifications, and details for most HP calculator; The HPDATAbase, a collection of data about all HP calculators; wiki4hp. Community driven wiki about HP calculators and related resources. Kahan, William (2020-11-16).

  4. HP 39/40 series - Wikipedia

    en.wikipedia.org/wiki/HP_39/40_series

    HP 39/40 series are graphing calculators from Hewlett-Packard, the successors of HP 38G. The series consists of six calculators, which all have algebraic entry modes, and can perform numeric analysis together with varying degrees of symbolic calculation.

  5. HP-19B - Wikipedia

    en.wikipedia.org/wiki/HP-19B

    HP-19B, introduced on 4 January 1988, along with the HP-17B, HP-27S and the HP-28S, and replaced by the HP-19BII (F1639A) in January 1990, [2] was a simplified Hewlett Packard business model calculator, like the 17B. It had a clamshell design, like the HP-18C, HP-28C and 28S. [3]

  6. HP-16C - Wikipedia

    en.wikipedia.org/wiki/HP-16C

    Like many other vintage HP calculators, the HP-16C is now highly sought-after by collectors. [14] In July 2023, the HP Development Company, L.P.'s licensees Moravia Consulting spol. s r.o. and Royal Consumer Information Products, Inc. introduced the HP-15C Collector's Edition, which comes with an undocumented mode to emulate the HP-16C as well ...

  7. HP-34C - Wikipedia

    en.wikipedia.org/wiki/HP-34C

    The calculator was superseded, in 1982, by the HP-15C.. Although it is argued the HP-41C (introduced late 1979 and only a matter of months after the HP-34C) was a replacement for the HP-34C, they were in fact differentiated as much by price (the HP-34C being 50% that of the HP-41C) as by functionality and performance (the HP-41C being the first HP LCD-based and module-expandable calculator ...

  8. HP-65 - Wikipedia

    en.wikipedia.org/wiki/HP-65

    The HP-65 introduced the "tall", trapezoid-shaped keys that would become iconic for many generations of HP calculators. Each of the keys had up to four functions. In addition to the "normal function" printed on the key's face, a "gold" function printed on the case above the key and a "blue" function printed on the slanted front surface of the ...

  9. HP-22S - Wikipedia

    en.wikipedia.org/wiki/HP-22S

    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.