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2. 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 ...

3. HP calculators - Wikipedia

   en.wikipedia.org/wiki/HP_calculators

   The finance-centric programmable calculator from the Voyager series introduced in the 1980s. The longest running product in the HP calculator line, it remains in production. Various models exist, the latest in 2008. HP-14B: 1988 Finance calculator with 12 digits precision and algebraic logic. It has 130 functions, 41 keys, and an LCD display ...

4. HP-35 - Wikipedia

   en.wikipedia.org/wiki/HP-35

   Introduced at US$395 (equivalent to $2,900 in 2023), [2] like HP's first scientific calculator, the desktop 9100A, it used reverse Polish notation (RPN) rather than what came to be called "algebraic" entry. The "35" in the calculator's name came from the number of keys. The original HP-35 was available from 1972 to 1975.

5. 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 ...

6. Amazon's Big Spring Sale: What is it and what early deals to ...

   www.aol.com/lifestyle/amazon-big-spring-sale...

   Amazon's Big Spring Sale starts on March 20 and runs through March 25, 2024. However, we imagine there will be some lead-up and post-sale deals worth shopping, too. How to shop Amazon's Big Spring ...

7. HP-42S - Wikipedia

   en.wikipedia.org/wiki/HP-42S

   Since it lacked expandability, and lacked any real I/O ability, both key features of the HP-41 series, it was marketed as an HP-15C replacement. The 42S, however, has a much smaller form factor than the 41, and features many more built-in functions, such as a matrix editor, complex number support, an equation solver , user-defined menus, and ...