HP21 scientific RPN calculator
HP21 scientific RPN calculator 정보
HP 21 - 첫 번째는 Hewlett-Packard 계산기 중 하나 RPN의 아름다움.
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.
What's new in the latest 2.9
HP21 scientific RPN calculator apk 정보
HP21 scientific RPN calculator의 오래된 버전
HP21 scientific RPN calculator 2.9
HP21 scientific RPN calculator 2.7
HP21 scientific RPN calculator 2.6
HP21 scientific RPN calculator 2.5
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