Free42

Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer.

This is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image. Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2. All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission. Different skins are also available.

• Decimal version: entering a number with an empty exponent (e.g., 1E or 1E-) would yield Not a Number. Fixed.
• iPhone version: HTTP server: Fixed downloading individual programs from, and uploading zip files of programs to, the /memory directory. This got broken in release 1.4.77, while implementing local file download.
• Android version: when the screen orientation was set to "automatic", it would not honor any system-wide orientation lock. Fixed.
• Fixed crash on startup in Android 5.0 (Lollipop).
• Printing to text would truncate the file whenever it was reopened, opening it for writing rather than appending. Fixed.
• Added nova1_1096 skin, for iPhone 5, to the Free42iPhoneSkins package.
• Fixed keyboard handling in the Preferences and Select File dialogs.
• Fixed scrolling behavior (in 1.5.4, windows were sized 20 pixels beyond the bottom of the screen, making the bottommost bit of scroll views drop off the screen).
• Added 4" skin for iPhone 5, and added code to select the best-fitting built- in skin on first launch.
• Decimal version: Fixed ACOS. It would return 0 for acos(-1). This bug was introduced in release 1.5.