Table Of Contents
Latest update [menu]
Re-compiled to support Android 9
Description [menu]
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.
How to install HP21 scientific RPN calculator APK for Android [menu]
Download HP21 scientific RPN calculator APK file (appinventor.ai_milancisar72.HP21_13_2390809.apk) from SameAPK.com, then follow these steps:
Update Phone Settings
- Go to your phone Settings page
- Tap Security or Applications (varies with device)
- Check the Unknown Sources box
- Confirm with OK
Go to Downloads
- Open Downloads on your device by going to My Files or Files
- Tap the APK file you downloaded (appinventor.ai_milancisar72.HP21_13_2390809.apk)
- Tap Install when prompted, the APK file you downloaded will be installed on your device.
How to install HP21 scientific RPN calculator APK on Windows 7/8/10 or MAC PC? [menu]
Download HP21 scientific RPN calculator APK file(appinventor.ai_milancisar72.HP21_13_2390809.apk) from SameAPK.com to your PC (ex: /Users/xxx/Downloads/(appinventor.ai_milancisar72.HP21_13_2390809.apk)), then follow these steps:
Using Emulator:
- Download And Install one Emulator Softwares (Ex: Bluestacks, GenyMotion, NoxPlayer)
- Simple install APK on PC by drag and drop file appinventor.ai_milancisar72.HP21_13_2390809.apk on Emulator screen
HP21 scientific RPN calculator APK Pros & Cons [menu]
Pros
- This app is safe, it's not require high risk permissions
- Compatible with 32 bit device (most Emulator using 32bit arch CPU)
- Compatible with 64-bit device (some android device and current Bluestacks)
Cons
Everything is good.
