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The HP-45
Type scientific
Introduced 1973
Discontinued 1976
Entry mode RPN
Display type Seven-segment display
Display size 10 + 2
Programming language(s) RPN key stroke

The HP-45 was the second scientific calculator introduced by Hewlett-Packard, adding to the features of the HP-35. Especially noteworthy was its pioneering addition of a shift key that gave the other keys alternate functions.

The calculator was code-named Wizard,[1] 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.


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 a large variety of operating systems.
HP-45 Emulator
HP-45 Emulator written in Java. Licensed under the GPL 3. Available for Android [2] and Symbian.[3]
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.


  1. ^ HP Calculator History - The HP-45
  2. ^ [1]
  3. ^ [2]

External links[edit]

  1. http://www.hpmuseum.org/hp45.htm
  2. http://www.digibarn.com/collections/calculators/hp45/index.html
  3. http://www.xnumber.com/xnumber/WMJ_hp45.htm