Free42 : An HP-42S Calculator Simulator
Free42 is a re-implementation of the HP-42S Scientific Programmable Calculator and HP-82240 Printer.
Sun Jan 20 23:17:37 2019 - permalink -
It is a complete rewrite, not using any HP code. 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.