This emulator is a work in progress and may be severely broken! You have been warned!
Dismiss This
This is a real calculator running the latest version of KnightOS! You can use your arrow keys, Enter, Escape, and your function keys (F1-F5) to try it out.
Dismiss This Guided Tour
Run up to 32 programs simultaneously
Cross Platform
Run your programs on 9 different calculators - including the new Color Silver Edition
Memory Safe
No more panicked RAM resets. Crashes do not affect user data.
More Memory
KnightOS programs may use 31K of RAM. TI-OS offers 24K under ideal conditions
Storage Space
KnightOS is compact, leaving plenty of space for your files
Open Source
You're freely able to browse, change, and improve the source code

KnightOS is the first open-source operating system for Texas Instruments calculators. It aims to be a Unix-like system that runs the average z80 calculator, with multitasking and a proper filesystem and other features familiar to users of conventional PC operating systems. The end goal is to also provide a great operating system suitable for use in the classroom.

Programmers, head over to the documentation. Users, hang in there while we work on fleshing out the system for you. If you'd like, you can come join us on IRC to chat about the project and make sure you like where it's going. We need your direction!

Supported calculators: TI-73, TI-83+, TI-83+ SE, TI-84+, TI-84+ SE, TI-84+ CSE