--- title: KnightOS/KnightOS: OS for z80 calculators | daily.dev description: KnightOS is a third-party Unix-like operating system for TI z80 calculators (TI-73, TI-83+, TI-84+ series). The repository serves as the official userspace,... canonical: https://daily.dev/posts/knightos-knightos-os-for-z80-calculators-cxef4nfsl twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: KnightOS/KnightOS: OS for z80 calculators | daily.dev og:description: KnightOS is a third-party Unix-like operating system for TI z80 calculators (TI-73, TI-83+, TI-84+ series). The repository serves as the official userspace,... og:url: https://daily.dev/posts/knightos-knightos-os-for-z80-calculators-cxef4nfsl og:image: https://api.daily.dev/og/posts/cxEf4nFsl.png og:image:alt: KnightOS/KnightOS: OS for z80 calculators og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # KnightOS/KnightOS: OS for z80 calculators **[Two Stop Bits](https://daily.dev/sources/twostopbits)** · 3 min read · 0 upvotes · 0 comments ## Summary KnightOS is a third-party Unix-like operating system for TI z80 calculators (TI-73, TI-83+, TI-84+ series). The repository serves as the official userspace, tying together separate KnightOS component projects. It includes instructions for compiling the OS using the KnightOS SDK along with tools like mktiupgrade, sass, and kimg. Supported make targets cover building ROM files, upgrade files, running in an emulator, and debugging. Custom kernels can be used during development. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [UNIX99, a UNIX-like OS for the TI-99/4A](https://daily.dev/posts/unix99-a-unix-like-os-for-the-ti-99-4a-utvorvhca) · Hacker News · 0 upvotes · 0 comments - [NostOS: the Nostalgia Operating System for the RC2014 retro/vintage computer](https://daily.dev/posts/nostos-the-nostalgia-operating-system-for-the-rc2014-retro-vintage-computer-9p2b4ddcu) · Adafruit Blog · 0 upvotes · 0 comments - [Who Had “New OS For The Z80” On Their 2026 Bingo Card?](https://daily.dev/posts/who-had-new-os-for-the-z80-on-their-2026-bingo-card--eb8lfemqw) · Hackaday · 0 upvotes · 0 comments - [os8088 -- a Mac-style GUI OS for the IBM PC XT](https://daily.dev/posts/os8088----a-mac-style-gui-os-for-the-ibm-pc-xt-5eeukkqfl) · Hacker News · 0 upvotes · 0 comments - [4 operating systems that owe nothing to Windows, Linux, or Unix](https://daily.dev/posts/4-operating-systems-that-owe-nothing-to-windows-linux-or-unix-ibhduic48) · XDA Developers · 1 upvotes · 0 comments --- Tags: [#assembly](https://daily.dev/tags/assembly), [#general-programming](https://daily.dev/tags/general-programming) [View this post on daily.dev](https://daily.dev/posts/knightos-knightos-os-for-z80-calculators-cxef4nfsl) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"KnightOS/KnightOS: OS for z80 calculators","url":"https://daily.dev/posts/knightos-knightos-os-for-z80-calculators-cxef4nfsl","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/knightos-knightos-os-for-z80-calculators-cxef4nfsl"},"datePublished":"2026-03-01T10:24:44.583Z","dateModified":"2026-03-15T03:45:38.134Z","description":"KnightOS is a third-party Unix-like operating system for TI z80 calculators (TI-73, TI-83+, TI-84+ series). 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