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## Calculator
A
TI-85 graphing calculator Today calculators are electronic, but in the past mechanical and clerical aids such as slide rules, abaci, comptometers, books of mathematical tables and Napier's bones were used, and a "calculator" was a person (most often female) who made calculations using pen(cil) and paper. ## Electronic CalculatorsToday most calculators are handheld microelectronic devices, but in the past some calculators were as large as many of today's computers. The first mechanical calculators were mechanical desktop devices, which were soon replaced by electromechanical desktop calculators, and then by electronic devices using first thermionic valves, then transistors, then hard-wired integrated circuit logic.A pocket calculator is a small battery-powered or solar powered electronic digital computer made possible by integrated circuit and semiconductor technology. Typically they are limited to an 8 – 10 digit single-number display and a few basic functions of arithmetic, but some modern ones have more of the features of a general-purpose computer. Pocket calculators rendered the slide rule obsolete. Calculators vary in their capabilities. Some are limited to only basic arithmetic; others support trigonometric and other mathematical functions. The most advanced modern calculators are programmable, can display graphics, and include features of computer algebra systems. ## HistoryIn 1954, IBM demonstrated a large all-transistor calculator. In 1957, IBM released the first commercial all-transistor calculator (IBM 608). The first hand-helds, as opposed to desktop calculators, went on sale in 1970 with models from Sharp and Canon, weighing around 1.7 lb.
The first pocket-sized model, the 901B (measuring 5.2" x 3.0" x 1.5" / 131mm x 77mm x 37mm), came out in the fall of 1971 from Bowmar, with four functions and an eight-digit red LED display, for $240, while in August 1972 the four function
The first with
Most common among early scientific calculators was the TI-30 from Texas Instruments (TI). The first
Monroe manual digital calculator The two leading manufacturers, HP and TI, released steadily more feature-laden calculators during the 1980s and 90s. At the turn of the millennium, the line between a graphing calculator and a PDA/ handheld computer was not always clear (forgetting the keyboard for the sake of the argument), as some advanced calculators such as the TI-89 and HP-49 could differentiate and integrate functions, run word processing and PIM software, and connect by wire or IR to other calculators/computers. In March 2002, HP announced that the company would no longer produce calculators, which was hard to fathom for some fans of the company's products; the HP-48 series in particular had an extremely loyal customer base. Nevertheless, HP continued producing calculators, but the latest models as of 2003 reportedly didn't have the mechanical quality HP's earlier calculators were famous for (instead featuring the more "youthful" look and feel of contemporary competing designs). The business calculator HP-12C is still produced. It was introduced in 1981 and is built until today with nearly no changes. For 2003 several new models were announced, including an improved version of the HP-12C, the "HP-12C platinum edition". The word "calculator" is occasionally used as a pejorative term to describe an inadequately capable general-purpose computer, as discussed in the Jargon file. ## See alsoslide rule, abacus, adding machine, list of calculators, computing, Curta calculator.## External links- On slide rules and mechanical calculators
- On TI's US Patent No. 3,819,921
- The Museum of HP Calculators
- Museum of Soviet Calculators
- HP Calculators' Wiki
- Vintage Calculators
- GraphCalc, an Open Source graphing calculator program that runs on a computer
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