277 reviews
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About this app

A scientific calculator based on the classic HP 41.

Go to "How to navigate in Android data and find the data used by the App:"
section at https://sites.google.com/site/olivier2smet2/home/go41cx to find how to manage datas.

For a special tablet edition look for go41cxt

Don't forget to get the manual (pdf file) at https://sites.google.com/site/olivier2smet2/home/go41cx

On Android 4.4 device, import/export directory is now /Android/data/o2s.emul.hp41cx/files/... instead of /go41cx/...
On S5 devices, long press the right hardware button to get the menu.

- menu is displayed when touching annunciators zone on the emulated LCD

- import bug from kitkat corrected

- state file save now modules
- new lib#4

- new skin
- forth 8K module support (only in CV mode, not supported on CX)
- lib#4 from A. Martin support
- lcd lowercase display (roms are patched)
- all import/export now use '/go41cx/...' directory instead of '/Download' on your sdcard (usually '/mnt/sdcard/'), export again all your files to recreate it.
- haptic feedback added (activate it in your device).
- short manual to explain all the behaviour (see at http://sites.google.com/site/olivier2smet2/home/go41cx ).
- new basic skin (like the first release).
- some interface changes (new really hard reset).
- partial card reader support (only hp67 emulation functions, no hardware, see http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv006.cgi?read=10774)
v1.4.0 upgrade: change of state file format, EXPORT your raws and xmem before upgrade if possible (MEMORY LOST at start).

Sound added, inline help (tap left of display), text overlays working again (use with 'black_o' graphics overlay or 'opt001' skin), ADV printer working (tap right of display), Config with _o.txt overlay files (tap middle of display).

Full HP 41 CX/CV emulator:

- Full memory and X memory.

- Timer functionnal, but accuracy not well tested (AF is not emulated).

- Manage states, overlays, raw prgms, xmem, ...

- Automatic save and load of state.

- Download modules, raws, from internet, then use 'import'.

- Use MOD modules, RAW programs format.

- You can put modules, raws, overlays, xmems, states in 'Download' directory of your SD card.

- 'ON' only active on 'longtouch' to avoid mistakes.

- Master clear supported (use 'press back' menu when calculator is off then press 'ON', then press 'back' to release it).

- Speed greater than 1 are not patched for 'PAUSE' ...

- Hepax support up to 4 * 8KW modules

- Top status line for Stack, Alpha ... display (tap on it to change it).

Avoid checking 'force gpu rendering' in developer option in android 4.x prefs, this leads to graphic problems.

Emulator loosely based on Non-Pareil from Eric Smith, font by Luiz C. Vieira.
Updated on
Nov 22, 2021

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277 reviews
Karl Meyer
September 14, 2021
This is an incredibly well done emulation of arguably the most advanced non-graphing calculator ever produced. It is total overkill for most and there is a learning curve if you want to program it. That said, there may not be another calculator with more documentation, user created software, ways to use functions never intended to be used, etc. I'm not sure there has ever been another calculator with more of a user community pushing it to do every thing it could possibly do. This can use all the roms, and has the advantage of being far faster than the original calculator. I'd guess most who've gotten the paid version actually own a real Hp-41. The one area where this falls short is it has no way to give the feel of the buttons on the real ones. It's one of those things if you know, I don't have to explain and if you don't know I can't.
4 people found this review helpful
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Doug Hansen
May 1, 2020
Several recent reviews have mentioned that with version 1.8.1 the bottom of the HP-41CX keyboard is obscured by the Android navigation bar. To fix this, tap on the bottom of the HP-41CX display to display the main menu. On this menu tap on the Full box, then tap OK to hide the Android navigation bar. That said, this is an incredibly good HP-41CX emulator and I would recommend it to anyone interested in this calculator.
16 people found this review helpful
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William Lightner
September 11, 2020
I like this. The only problem is that the Android bar at the bottom overlays the last roll of keys on the calculator. I noticed this doesn't happen for the go41c version of the application, so it is probably something that just hasn't been applied to this version yet.
7 people found this review helpful
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What's new

Android 12 support