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2. HP-65 - Wikipedia

   en.wikipedia.org/wiki/HP-65

   The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795 [1] (equivalent to $4,912 in 2023) [2], it featured nine storage registers and room for 100 keystroke instructions. It also included a magnetic card reader/writer to save and load programs.

3. Comparison of HP graphing calculators - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_HP_graphing...

   A graphing calculator is a class of hand-held calculator that is capable of plotting graphs and solving complex functions. While there are several companies that manufacture models of graphing calculators, Hewlett-Packard is a major manufacturer. The following table compares general and technical information for Hewlett-Packard graphing ...

4. HP calculators - Wikipedia

   en.wikipedia.org/wiki/HP_calculators

   HP calculators are various calculators manufactured by the Hewlett-Packard company over the years. Their desktop models included the HP 9800 series, while their handheld models started with the HP-35. Their focus has been on high-end scientific, engineering and complex financial uses.

5. HP-55 - Wikipedia

   en.wikipedia.org/wiki/HP-55

   Like all Hewlett-Packard calculators of the era and most since, the HP-55 used Reverse Polish Notation (RPN) and a four-level automatic operand stack. Another feature of the HP-55 was that it officially featured a stop-watch function much similar to the hidden stop-watch function of the earlier HP-45 calculator. This stop-watch function could ...

6. Category:HP calculators - Wikipedia

   en.wikipedia.org/wiki/Category:HP_calculators

   Pages in category "HP calculators" The following 133 pages are in this category, out of 133 total. This list may not reflect recent changes. ...

7. Hewlett-Packard Voyager series - Wikipedia

   en.wikipedia.org/wiki/Hewlett-Packard_Voyager_series

   The Hewlett-Packard Voyager series of calculators were introduced by Hewlett-Packard in 1981. [4] All members of this series are programmable, use Reverse Polish Notation, and feature continuous memory. Nearly identical in appearance, each model provided different capabilities and was aimed at different user markets.