HP-45
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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] (Expression error: Unrecognized punctuation character "[".).Template: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.
File:HP-45 (101587990).jpg
The display of the HP-45 hidden timer showing 00 hours 00 minutes 07 seconds and 58/100 second.
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| 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%, Template: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 <templatestyles src="Citation/styles.css"/>Template:Citation/make linkScript error: No such module "Check for unknown parameters"..
References
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Further reading
- <templatestyles src="Citation/styles.css"/>Template:Citation/make linkScript error: No such module "Check for unknown parameters". Inverse/complementary function prefix key