|Display type||Seven-segment display|
|Display size||10 + 2|
|Programming language(s)||RPN key stroke|
The HP-45 was 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 $395 (equivalent to $2,178 in 2017). Especially noteworthy was its pioneering addition of a shift key that gave the 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.
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  and Symbian.
- HP-45 Windows Phone 7 App
- An Emulator for Windows Phone 7.
- "HP Virtual Museum: Hewlett-Packard-45 advanced scientific pocket calculator, 1973". Retrieved 2017-10-15.
- Free, John R. (April 1974). "Those incredible new scientific pocket calculators". Popular Science. p. 124. Retrieved 2017-10-15.
- Federal Reserve Bank of Minneapolis Community Development Project. "Consumer Price Index (estimate) 1800–". Federal Reserve Bank of Minneapolis. Retrieved January 2, 2018.
- HP Calculator History - The HP-45
- https://www.google.com/patents/US3892958 Inverse/complementary function prefix key, patent US3892958A