HP21 scientific RPN calculator 2.0 Icon

HP21 scientific RPN calculator

Milan Cisár Tools
4.5
145 Ratings
10K+
Downloads
2.0
version
May 07, 2019
release date
2.1 MB
file size
Free
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What's New

Re-compiled to support Android 9

About HP21 scientific RPN calculator Android App

The HP-21 was a scientific calculator produced by Hewlett-Packard between 1975 and 1978. It was designed as a replacement for the HP-35, and was the first from so called Second Generation Handheld Calculators.

As with most HP calculators then and now, the HP-21 used RPN entry logic, with a four-level stack. It also had a single user-accessible memory register. A shift key provided access to functions whose legends were printed on the fronts of the tall trapezoidal keys.

To enhance practical usability, display was modified to show both X and Y register. Also I have eliminated mechanical DEG/RAD switch and moved the function under DSP button.
HP21 has few big enough buttons to be used comfortably on mobile devices.

Other Information:

Requires Android:
Android 1.5+
Other Sources:
Category:

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This version of HP21 scientific RPN calculator Android App comes with one universal variant which will work on all the Android devices.

Variant
6
(May 07, 2019)
Architecture
universal
Minimum OS
Android 1.5+
Screen DPI
nodpi (all screens)
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