48sx, a vintage RPN calculator

48sx : The HP48 sx emulator !

HP48sx is a vintage RPN calculator. I used this calc 30 years ago ;-) I love this calc....and now I can have it in my pocket every day !

HP48sx emulator for Android, released on the Play Store. The bundled ROM is free for non commercial use. No nag, no Ad, completely FREE!

- Play Store: https://play.google.com/store/apps/details?id=org.czo.droid48sx
- Old releases apk: https://github.com/czodroid/droid48sx/releases
- Sources code: https://github.com/czodroid/droid48sx

48sx is a modified version of droid48 but for the HP48 SX, the credit goes to Arnaud Brochard (author of droid48 for Android), and of course Eddie C. Dost (author of x48 for UNIX) who created an emulator of the Saturn processor in 1990.

48sx CHANGELOG
===============

* 11 Feb 2024 (Version 13.1.28459983)
- Bug fixes and performance improvements
- Intended to work from Android 4.4 to 13 on armeabi-v7a, arm64-v8a, x86 and x86_64 architectures
- On Android 13 (API 33), you must allow "Photos and videos permission". The file must be located in the Download folder, and its extension must be ".png" for "Load object on stack" and "Restore checkpoint ZIP" to work.

* 26 Aug 2023 (Version 2.42.28217746)
- Bug fixes and performance improvements
- Intended to work from Android 4.4 to 13 on armeabi-v7a, arm64-v8a, x86 and x86_64 architectures
- New name for checkpoint ZIP: Download/48sx_cp_$DATE.zip
- New SVG icon for Android above Oreo (Android 8, API >= 26)

* 10 Jul 2022 (Version 2.42.27624074)
- Bug fixes and performance improvements
- Intended to work from Android 4.4 to 12 on armeabi-v7a, arm64-v8a, x86 and x86_64 architectures
- Fixed the "Large LCD" option in the settings, and replaced it with "HP48 LCD" to get full pixels
- The HP48's LCD screen has now a maximum width on your device, but you can set "HP48 LCD" in the settings get full pixels

* 4 June 2022 (Version 2.42.27573940)
- Bug fixes and performance improvements
- Intended to work from Android 4.4 to 12 on armeabi-v7a, arm64-v8a, x86 and x86_64 architectures
- Haptic feedback enabled by default, but can be disabled on settings
- New menu: 'Save checkpoint ZIP As...' : save the current checkpoint in a zipped file (in Download/checkpoint_$DATE.zip). This zip file must contain the files ('hp48', 'rom', 'ram' and maybe 'port1' or 'port2')
- New menu: 'Restore checkpoint ZIP' : restore from a zipped checkpoint.zip (that you choose)
- Permissions on "Choose File" works on some Android 11 and 12, depending on the brand. This will be my next update...
- When the action bar is enabled, pressing an hp48 button disables it again
- Checkpoint is saved at the first startup and new functions to load a stuck HP48
- New shortcuts, one for full reset, and another to restore from a checkpoint when the emulator is stuck

* 18 Oct 2019 (Version 1.42)
- Bug fixes and performance improvements
- Intended to work from Android 2.2 to 10 on armeabi-v7a, arm64-v8a, x86 and x86_64 architectures
- New skin, A..F are the same size of others key
- Portrait mode only
- New round icon
- New name : 48sx

* 30 Jan 2016 (Version 1.39)
- Intended to work from android 2.2 to 6.x on armeabi, armeabi-v7a, arm64-v8a, mips, mips64, x86 and x86_64 architectures
- New amazing skin, should be more readable on big screens
- New action bar with icons and menu when touching HP48sx screen
- New icon
- Complete fullscreen for android 4.4, 5.x and 6.x
- Corrected port2 settings
- Haptic feedback disabled by default, but can be re-enabled

* 26 Jan 2014 (Version 1.38)
- Corrected "put program on stack" bug
- Corrected FC bug on android 4.3
- Corrected random freeze on android 4.4
- Data files are now stored on /sdcard/Android/data/org.czo.droid48sx/files
- New menu: Save checkpoint, Restore checkpoint, and Full reset (deletes firmware/ram and deactivate ports, if calc is still hung, please uninstall/reinstall)