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Hewlett-Packard Voyager series
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The Hewlett-Packard Voyager series of calculators were introduced by Hewlett-Packard in 1981. All members of series are programmable, use Reverse Polish Notation. Nearly identical in appearance, each model provided different capabilities and was aimed at different user markets, the HP calculators Voyager series consisted of five models, some of which were manufactured in several variants, HP-10C – basic scientific calculator. The HP-10C is the last and lowest-featured calculator in this line, the 10C was a basic scientific programmable. While a useful general purpose RPN calculator, the HP-11C offered twice as much for only an increase in price. Designed to be an introductory calculator, it was still costly compared to the competition, poor sales led to a very short market life, making it one of the most difficult of the series to find today. The HP-11C is a scientific programmable calculator. The HP-12C is a financial calculator. It was such a model that Hewlett-Packard redesigned it from scratch, added several new functions. Over the course of years, several editions of the calculator were produced as well. The HP-12C is HPs longest and best-selling product, in production since its introduction in 1981. The HP-15C is a scientific programmable with a root-solver and numerical integration. It is also able to handle complex numbers and matrix operations, although long being discontinued its continued popularity among users triggered Hewlett-Packard to offer a HP 15c Limited Edition remake of the calculator in 2011. The HP-16C is a programmers calculator, designed to assist in debugging. It can display numbers in hexadecimal, decimal, octal and binary, a number of specialized functions are provided to assist the programmer, including left- and right-shifting, masking, and bitwise logical operations. HP has never made another programmers calculator, but has incorporated the 16Cs functions in later calculator models and he also wrote parts of the manuals. The HP Voyager series calculator are keystroke programmable, meaning that it can remember and later execute sequences of keystrokes to solve problems of interest to the user. The available programming features differentiate between the various HP Voyager series calculator systems, the HP-12C and its derivatives remains in widespread use today and is still available from Hewlett-Packard