free42: free42 (re-implementation of HP-42S calculator and HP-82240 printer) free42: free42: Free42 is a re-implementation of the HP-42S calculator and the free42: HP-82240 printer. It is a complete rewrite, not using any HP code, free42: and it does not require an HP-42S ROM image. Free42 is an Open free42: Source project. The executables and source code are released free42: under the terms of the GNU General Public License, version 2. free42: All third-party code used in Free42 is either in the public domain, free42: or licensed under terms compatible with GPLv2, or used with the free42: authors' permission. free42: Homepage: http://thomasokken.com/free42/index.html