Range entry calculator, Scientific Programmable, statistical functions. HP-10B - Financial calculator introduced in 1988.

HP-10 - 1977 basic 4 function calculator with printer and conventional arithmetic entry (no RPN).

HP 9S - Scientific calculator designed by Kinpo Electronics, Inc., with the same form factor as the 9G and the 30S.

HP 9g - Graphing calculator designed by Kinpo Electronics, Inc.

Calculatorsīelow are some of HP’s handheld calculator models produced over the years, in numeric rather than chronological order: Programmable HP calculators allow users to create their own programs.

HP calculators are well known for their use of Reverse Polish Notation (RPN). Some of them could be used (via HP-IL) to control the instruments other Hewlett Packard divisions produced. Through the years, HP released several calculators that varied in their mathematical capabilities, programmability, and I/O capabilities. This calculator provided functionality that was revolutionary for a pocket calculator at that time. He charged his engineers with this exact goal using the size of his shirt pocket as a guide. This new calculator was well received by the customer base, but William Hewlett saw additional opportunities if the desktop calculator could be made small enough to fit into his shirt pocket. This was a full-featured calculator that included not only standard 'adding machine' functions but also powerful capabilities to handle floating-point numbers, trigonometric functions, logarithms, exponentiation, and square roots.

With this in mind, HP built the HP 9100 desktop scientific calculator. The corporation recognized two opportunities: it might be possible to automate the instrumentation that HP was producing, and HP's customer base were likely to buy a product that could replace the slide rules and adding machines that they were now using for computation. In the 1960s, Hewlett-Packard was becoming a diversified electronics company with product lines in electronic test equipment, scientific instrumentation, and medical electronics, and was just beginning its entry into computers. Their focus has been on high-end scientific, engineering and complex financial uses.

Their desktop models included the HP 9800 series, while their handheld models started with the HP-35. HP calculators are various calculators manufactured by the Hewlett-Packard company over the years.

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