(2,714 ratings)

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.

From version Free42 2.5.22a:


Fixed crash on certain older devices.


Pre-populating file names in file selection dialogs now.

Implemented LASTO. This is related to LSTO like ASTO is related to STO.

Implemented No-Operation (NOP) function.

GETKEY didn't halt on Shift-EXIT. Fixed.

Implemented GETKEY1 function. This works like the regular GETKEY, except it only halts on R/S.

STOFLAG didn't update the G and RAD annunciators when flags 42 or 43 were changed. Fixed.

Implemented range option for STOFLAG.

All versions
November 25, 2020
November 23, 2020
October 25, 2020
September 20, 2020
July 5, 2020
April 12, 2020
February 28, 2020
February 22, 2020
January 25, 2020
January 18, 2020