About Free42
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...
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.
Previous Versions
Here you can find the changelog of Free42 since it was posted on our website on 2015-04-25 03:00:00.
The latest version is 3.3.12 and it was updated on 2026-06-18 06:51:12. See below the changes in each version.
Free42 version 3.3.12
Updated At: 2026-05-04
Changes: Fixed RLN and RRN for negative numbers in BSIGNED mode.
More accurate GAMMA for integer arguments.
Free42 version 3.3.11
Updated At: 2026-01-13
Changes: Added statistics sums to STAT-> Σ and CATALOG-> STAT menus.
Fixed initial keyboard focus.
Free42 version 3.3.10
Updated At: 2025-10-28
Changes: Fixed crash in menu logic.
Free42 version 3.3.9a
Updated At: 2025-10-21
Changes: Another workaround for the buggy vibrator in Android 16. This one is a new option, "use older haptic feedback logic," for phones like the Pixel 10 Pro, where the pre-3.3.8f haptic feedback logic worked, but the new logic introduced in 3.3.8f does not.
Free42 version 3.3.8c
Updated At: 2025-07-19
Changes: Fixed "No Status" and "Full Screen" modes. These got broken in 3.3.8.
Free42 version 3.3.6a
Updated At: 2025-06-10
Changes: Fix for hang during audio playback.
Free42 version 3.3.6
Updated At: 2025-06-05
Changes: Fixed potential crash on app restart.
Fixed memory leak on app restart.
Free42 version 3.3.5
Updated At: 2025-05-20
Changes: Better handling of ACC=0 in INTEG.
More accurate C.E^X-1.
Free42 version 3.3.4
Updated At: 2025-05-06
Changes: Fixed handling of shared matrices in PUTMI.
Fixed handling of subnormal complex numbers in 1/X.
Added SLN, SRN, and ASRN to CATALOG-> BASE.
Fixed skin key highlighting for hardware keyboard keystrokes, when using certain skins with complicated key mappings.
Free42 version 3.3.3
Updated At: 2025-04-29
Changes: BASE menu: Implemented SLN, SRN, and ASRN. These functions are can be typed as Shift-SL, Shift-SR, and Shift-ASR, respectively, and RJ can now be typed as Shift-LJ.
More accurate DET, INVRT, and matrix division for 2x2 matrices.
When spelling out built-in function names, '-' is now accepted as an alternative for '→', to make conversion functions easier to type.
Visual feedback for shifted menu keys.
Decimal version: BS→N and BD→N were rounding their results to 16 digits. Fixed.
Disclaimer
Official Google Play Link
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