Emu42 for Android

102 reviews
Content rating
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About this app

This project ports the Windows application Emu42 written in C to Android.
It uses the Android NDK. The former Emu42 source code (written by Christoph Giesselink) remains untouched because of a thin win32 emulation layer above Linux/NDK!
This win32 layer will allow to easily update from the original Emu42 source code.
It can open or save the exact same state files (state.e??) than the original Windows application!

This application does NOT come with the ROM files!
You will need KML scripts and ROM files already copied into your Android filesystem.
You can download the KML scripts here: http://regis.cosnier.free.fr/soft/androidEmu42/KML-original-127.zip
Or you can download the KML scripts from the original Emu42 Windows application archive (https://hp.giesselink.com/emu42.htm)
and you can extract the ROM file from a real calculator (or be lucky on internet).
Be careful about the case sensitivity of the filename in the KML script (Linux is case sensitive, not Windows).

The application does not request any permission (because it opens the files or the KML folders using the content:// scheme).

The application is distributed with the same license under GPL and you can find the source code here:


1. From the left side, slide your finger to open the menu.
2. Touch the "New..." menu item.
3. "Select a Custom KML script folder..." where you have copied the KML scripts and ROM files.
4. Pick a calculator.
5. And the calculator should now be opened.


- For technical reason, this application need the Android 5.0 (API 21).
- The Help menu displays Emu48's original help HTML page and may not accurately reflect the behavior of this Android version.
- When using a custom KML script by selecting a folder, you must take care of the case sensitivity of its dependency files.
- This Emulator does not include the ROM files or the KML files.
- To speed up printing, set the 'delay' to 0 in the calculator's print options.


- Disassembler
- Debugger


Android version by Régis COSNIER.
This program is based on Emu42 for Windows version, copyrighted by Christoph Gießelink & Sébastien Carlier.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Updated on
Nov 6, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
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No data collected
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Ratings and reviews

89 reviews
David Griffith
December 14, 2021
Key sensing is a little off. It seems like I need to get exactly in the middle for a keystroke to be recognized. Otherwise, great emulations.
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Domenic Padula
January 9, 2022
Worked on S21 Ultra. Getting BMP display error on Pixel 6. Displays a large white rectangle near where LCD is depicted. Calc doesn't run with ROM that worked ok other phones.
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A Google user
February 16, 2020
Great portage of Emu42. Like most of HP emulators, you need to find the Rom, that you can dump if you own the calculator, or find pretty easily online...
6 people found this review helpful
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What's new

- Update from the original source code Emu42 version 1.29 from Christoph Gießelink (Copy/paste improvement).
- Attempt to fix haptic feedback with Android 13 (API deprecation).