HP-45

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 with an MSRP of US$395 (). Especially noteworthy was its pioneering addition of a shift key that gave other keys alternate functions.

The calculator was code-named Wizard, 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. An accurate version of the stopwatch mode was officially featured in the 1975 successor of the HP-45, the HP-55.

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%, , 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 and Symbian. 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 .

References

HP-45

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