HP-45
HP-45
Advanced Scientific Electronic Pocket Calculator
TypeScientific
Introduced1973
Discontinued1976
Calculator
Entry modeRPN
Display typeRed LED seven-segment display
Display size15 digits (decimal point uses one digit), (±10±99)
Programming
Programming language(s)RPN key stroke
Memory registerFour-register operational stack with nine addressable memory registers + LASTx register
Other
Power supplyInternal rechargeable battery or 115/230 V AC, 5 W
WeightCalculator: 9 oz (260 g),
recharger: 5 oz (140 g)
DimensionsLength: 5.8 inches (150 mm),
width: 3.2 inches (81 mm),
height: 0.7–1.3 inches (18–33 mm)

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] (equivalent to $2,604 in 2022).[3] Especially noteworthy was its pioneering addition of a shift key that gave other keys alternate functions.

The calculator was code-named Wizard,[4] 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.[5][6] 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+, −, ×, ÷
Trigonometrysin, arc sin; cos, arc cos; tan, arc tan (decimal degrees, radians or grads).
Logarithmslog10x, 10x; logex, ex
ConversionsDecimal degrees, radians or grads ↔ degrees–min.–sec.
Rectangular coordinates ↔ polar coordinates.
Conversion units: cm/in, kg/lb, ltr/gal
Other1/x, √x, x2, yx, n!, %, Δ%, π, 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[7] and Symbian.[8]
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 US 4001569A .

References

  1. ↑ "HP Virtual Museum: Hewlett-Packard-45 advanced scientific pocket calculator, 1973". Retrieved 2017-10-15.
  2. ↑ Free, John R. (April 1974). "Those incredible new scientific pocket calculators". Popular Science. p. 124. Retrieved 2017-10-15.
  3. ↑ 1634–1699: McCusker, J. J. (1997). How Much Is That in Real Money? A Historical Price Index for Use as a Deflator of Money Values in the Economy of the United States: Addenda et Corrigenda (PDF). American Antiquarian Society. 1700–1799: McCusker, J. J. (1992). How Much Is That in Real Money? A Historical Price Index for Use as a Deflator of Money Values in the Economy of the United States (PDF). American Antiquarian Society. 1800–present: Federal Reserve Bank of Minneapolis. "Consumer Price Index (estimate) 1800–". Retrieved 2023-05-28.
  4. ↑ Mier-Jędrzejowicz, Włodzimierz "Włodek" Anthony Christopher. "THE HP-45". HP CALCULATOR HISTORY.
  5. ↑ Miller, Paul E. (2016-08-31). "HP-45 Calculator As A Stopwatch". Decode Systems.
  6. ↑ HP 45 Scientific Calculator Hidden Timer. Retrieved 2022-08-05 – via youtube.com.
  7. ↑ Krischik, Martin (2023-09-09). "HP-45 scientific calculator". Apps on Google Play.
  8. ↑ "HP-45 scientific calculator". smartsam.de. 10 May 2009. Archived from the original on 22 April 2012.

Further reading

  • US 3892958A  Inverse/complementary function prefix key
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