Free42 is a re-implementation of the HP-42S calculator and the HPprinter. This program is a complete rewrite and does not use any HP code, eliminating the need for an HP-42S ROM image. As an Open Source project, Free42 is released under the terms of the GNU General Public License, version 2. It ensures that the executables and source code are freely available to users.

Free42 is designed to replicate the functionality of the HP-42S calculator, providing users with a familiar and intuitive interface. It offers a comprehensive set of features, allowing users to perform complex calculations, solve equations, and create programs. Additionally, Free42 includes support for the HPprinter, enabling users to print their calculations and results.

The program incorporates third-party code that is either in the public domain or licensed under terms compatible with GPLv2. This ensures that Free42 is a reliable and trustworthy tool for users who rely on the functionality of the HP-42S calculator and HPprinter.