An open-source OS for calculators


Scas updates 01 Jul 2020

KnightOS holds a special place in my heart, and it probably always will. It’s lodged right next to some of the tubes, and the doctors say there’s no way I would survive attempting to remove it. It’s a tragedy really, but I make the most of it. Your pointy swords won’t ensnare me forever, KnightOS! Eventually I’ll be dead! Ha!

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Decimal math support 19 Aug 2017

As a calculator programming hobbyist and open source enthusiast, I have been watching KnightOS’s development with great interest. Although I wanted to contribute, I was held back by lack of free time and needing to use my calculator for actual math classes. (Imagine that!) In the few weeks between graduation and starting work, however, I found myself able to contribute. I decided to focus on one of the highest barriers to adoption of KnightOS: its lack of decimal math support.

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SDK v2 released 08 Jul 2017

Though KnightOS development is slow, it is steady. The project never dies, despite long periods of stagnation, because every so often someone comes around and works on some new features that inspire others (myself included) to stir from idleness and contribute for a while.

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What is KnightOS?

KnightOS is an open-source operating system for Texas Instruments calculators. It's freely available in both source and binary forms under the terms of the MIT license. With KnightOS, you get an unmatched level of freedom and customization over your calculator.

Why KnightOS?

If you choose to use KnightOS, you get more memory to play with, more space for your files, and loads of great features. KnightOS has a package manager for easy installation of software and can run several things at once. If you're into free and open-source software, you'll also find KnightOS to be a hacker's paradise.

Can I use KnightOS?

KnightOS will run on any upgradable Texas Instruments calculator based on the z80 CPU. This includes the TI-73, TI-83+, TI-83+ Silver Edition, TI-84+, TI-84+ Silver Edition, and TI-84+ Color Silver Edition. You can also run it on the French variations of these calculators, or in an emulator.

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Get Involved

The best thing about KnightOS, by far, is the open-source nature of it. KnightOS is built by a community of developers around the world - a community that you are welcome to join! Even if you aren't a programmer, you can help the project grow. If you are interested in writing code, you can help us build KnightOS in assembly, C, Python, HTML/CSS, and JavaScript.

KnightOS development is centered around GitHub. There are a lot of sub-projects and a lot of things to do, so you're welcome to dive in and get started. We track all bugs, feature requests, and todo items here. You can browse by programming language and difficulty, so I'm sure there's something there for you.

Non-programmers can help us work on the user manual, write documentation, triage bugs, and more. We also rely a lot on you guys to provide devs with feedback and ideas so that we can make the best OS possible. You can even edit this website - click the link at the bottom of each page to get started.

Regardless of your passion, chat with us on IRC; we're happy to have newcomers.

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