Free42

Thomas Okken

About this app

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.

Ratings and reviews

Oops! My apologies! I mixed up two different HP emulators. and I was awfully cranky about it. My apologies. Free42 appears to be a pretty good HP calculator emulator, I was just upset because it doesn't look like my favorite, which doesn't work any more. Free42 seems to work just fine. I know there are what, a couple of dozen skins available, too.

This is a great app for all of us RPN nuts out there. I probably have 15 different HP's put out to pasture (in a drawer) that don't get much use as I'm now retired. This has been my everyday, goto calculator since. I plugged in the old Elgin & Knowles astronomic azimuth program which appears to run just fine with current ephemeris data. Send a few bucks in to the developer as this app is worth its weight in gold. I'd rate it higher if possible.

Great simulation of the HP-42S. I used to be able to transfer data in and out via the clipboard on my Android device. About a year ago that functionality became unavailable. I miss it.

What’s new

Added statistics sums to STAT->Σ and CATALOG->STAT menus.

Fixed initial keyboard focus.