Emulator for TI-59 Calculator

Pascal Obry

About this app

Emulate a 1977 vintage Texas Instruments TI-58/58C/59 calculator. This programmable emulator lets you load/save programs, it includes an implementation of the original Master Library module and many other modules (Leisure, Math, Surveying, Electrical, Aviation, Marine). Sources on GitHub at https://github.com/TurboGit/ti5x_android include a tools for building your own program/module files.

The ti5x application does aim for 100% authenticity even if not possible in all cases. Yet, it supports many undocumented features from the original calculator like the HIR registers and the /DSZ nn 51/ (decrement no-jump) instructions.

With the current version it is possible to play some famous games. And many original programs are running without modification.

Ratings and reviews

This is an excellent TI/AOS calculator with the EE & ENG, and 1/x keys that I am so used to. My 3/5 stars have to do with usability. There is a loud and annoying keypress sound that I can't find a way to disable. The double line font is hard to read - solid would be better. And for those of us with low color vision, changing the red-on-black numeric display to a higher contrast combo would be helpful (although this is true to product). Love it but hard for an old geezer to use.

Very, very good app. The only thing I am missing is the possibility to create and to write on an own card (the yellow one, on original TI59 it was the magnetic card) for an own programm. To write title and symbols on the fields.

Provides a good simulation/emulation of the TI-58/59, without being an exact replacement for it: the app has a few additional features, and occasionally programs developed on the calculator won't run correctly in the app. I've used the app frequently over the past two years and its behavior has changed recently. It now forgets stored data, program, and settings between sessions. Otherwise, it's a great app, and I hope that the recent issues with it can be fixed soon.

What’s new

v10.2, 2026 February 7th:
Make the printer state persistent
Fix clearing the paper

v10.1, 2026 January 30th:
Fix layout on tablets

v10.0, 2026 February 1st:
Calc status in topbar (Angle/2nd/Inv)
Large UI revamp.
New print view (unlimited)

v9.5, 2025 January 17th:
Sort programs alphabetically.
Allows for 1500 steps in bank 0.

v9.4, 2024 September 1st:
Add MIN/MAX extension on INV -

v9.3, 2024 May 5rd:
Fix decimal display precision.