HP21 scientific RPN calculator

Download this app named HP21 scientific RPN calculator.

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.

Updates:

2.7.
Y^X complex result bug fixed (Error is shown for COmplex result)
2.6.
touch area re-alligned to buttons properly - thank you Eric
2.5.
Can enter number by EEX button directly
2.4.
To improve usablity - now running in full screen

 

 

Free download Android HP21 scientific RPN calculator from MyAndroid.net

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