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About this app
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.
What's new
Version 3.5.2 · Nov 5, 2026
Implemented ARG. Implemented conversions to and from DPD-encoded decimal floating point: N→PS/PD/PQ, PS/PD/PQ->N. Fixed two-argument STOFLAG. It got broken in 3.5. Fixed pasting of HP-41 style GTO/XEQ IND X/Y/Z/T/L.
