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HP-65
The HP-65 was the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795,〔(【引用サイトリンク】title=HP Virtual Museum: Hewlett-Packard-65 programmable pocket calculator, 1974 ) US$795 in 1974 ≈ US$3,420 in 2009 (see (The Inflation Calculator ))〕 it featured nine storage registers and room for 100 keystroke instructions. It also included a magnetic card reader/writer to save and load programs. Like all Hewlett-Packard calculators of the era and most since, the HP-65 used Reverse Polish Notation (RPN) and a four-level automatic operand stack.
Bill Hewlett's design requirement was that the calculator should fit in his shirt pocket. That is one reason for the tapered depth of the calculator. The magnetic program cards are fed in at the thick end of the calculator under the LED display. The documentation for the programs in the calculator is very complete, including algorithms for hundreds of applications, including the solutions of differential equations, stock price estimation, statistics, and so forth.
==Features==
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 4 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 key were accessed by pushing the gold "f" and blue "g" prefix key, respectively. For example, "f" followed by "4" would access the sine function, "g" followed by "4" would calculate 1/x. For some mathematical functions, a gold "f −1" prefix key would access the inverse of the gold-printed functions, e.g. "f −1" followed by "4" would calculate the inverse sine (sin−1).
Functions included square root, inverse, trigonometric (sine, cosine, tangent and their inverses), exponentiation, logarithms and factorial. The HP-65 was one of the first calculators to include a base conversion function, although it only supported octal (base 8) conversion. It could also perform conversions between degrees/minutes/seconds and decimal degree values, as well as polar/cartesian coordinate conversion.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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