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 2.2:
YMD mode for date functions, using YYYY.MMDD as the numeric format and YYYY-MM-DD as the display format.

Local variables. You create them with the new LSTO function, and they disappear automatically when the current subroutine ends.

Dynamically growing RTN stack, up to 1024 levels.

Direct command mapping in skins. This is specified by creating Macro: lines where the macro is not a sequence of keystrokes, but a command name enclosed in double quotes, e.g., Macro: 40 "SST→"
All versions
April 7, 2019
March 27, 2019
March 27, 2019
March 18, 2019
March 17, 2019
March 3, 2019
February 28, 2019
February 26, 2019
February 25, 2019
February 25, 2019