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HP21 scientific RPN calculator for Android

By Milan Cisr Free

Developer's Description

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.

Full Specifications

What's new in version 2.9

General

Release July 18, 2019
Date Added July 18, 2019
Version 2.9

Operating Systems

Operating Systems Android
Additional Requirements Requires Android

Popularity

Total Downloads 13
Downloads Last Week 3
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