Английская Википедия:HP-45

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Шаблон:Use dmy dates Шаблон:Infobox Calculator

The HP-45 is the second scientific pocket calculator introduced by Hewlett-Packard, adding to the features of the HP-35. It was introduced in 1973[1] with an MSRP of US$395[2] (Шаблон:Inflation).Шаблон:Inflation-fn Especially noteworthy was its pioneering addition of a shift key that gave other keys alternate functions.

The calculator was code-named Wizard,[3] which is the first known use of a code name for a calculator.
It also contained an Easter egg that allowed users to access a not-especially accurate stopwatch mode.[4][5] An accurate version of the stopwatch mode was officially featured in the 1975 successor of the HP-45, the HP-55.

Файл:HP-45 (101587990).jpg
The display of the HP-45 hidden timer showing 00 hours 00 minutes 07 seconds and 58/100 second.

HP-45 functions
Arithmetic +, −, ×, ÷
Trigonometry sin, arc sin; cos, arc cos; tan, arc tan (decimal degrees, radians or grads).
Logarithms log10x, 10x; logex, ex
Conversions Decimal degrees, radians or grads ↔ degrees–min.–sec.
Rectangular coordinates ↔ polar coordinates.
Conversion units: cm/in, kg/lb, ltr/gal
Other 1/x, √x, x2, yx, n!, %, Δ%, Шаблон:Pi, vector arithmetic, register arithmetic.
Statistical accumulation with mean and standard deviation calculations.
Fixed point and scientific display modes, 0 – 9 decimal places round-off.

Emulators

Several individuals and companies make software emulators of the HP 45 series calculators.

Nonpareil, high-fidelity simulator for calculators
Emulates, among other, the HP-45. Licensed under the GNU General Public License (GPL). Available for Microsoft Windows.
HP-45 Emulator
HP-45 Emulator written in Java. Licensed under the GPL 3. Available for Android[6] and Symbian.[7]
HP-45 Windows Phone 7 App
An Emulator for Windows Phone 7.
HP-45 Emulator in JavaScript
The HP-45 Program ROM was translated to JavaScript to have an exact simulation of the original calculator for use in web browsers.
HP-45 Emulator in Python
Simulates the HP-45 and displays and explains its inner workings. For Linux, MacOS, Windows, CP/M, and more, with minimal mode for low-power machines.

Patents

The complete design of the calculator and its firmware is patented under Шаблон:Patent.

References

Further reading

External links

Шаблон:HP calculators