Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer.
It 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.
Made the app explicitly single-instance (by adding launchMode=”singleInstance” to Free42Activity in the app manifest). This should eliminate the remaining null-pointer crashes in the native code, and also prevent State File Corrupt scenarios.