--- title: Moxnox: NT-Like, POSIX-Compatible Hobby OS Running Atop... description: Mark Harmstone, known for his Btrfs driver for Windows, has released version 1.0 of Moxnox, a hobby operating system. Moxnox models its system calls after... canonical: https://daily.dev/posts/moxnox-nt-like-posix-compatible-hobby-os-running-atop-btrfs-3t0zica9x twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Moxnox: NT-Like, POSIX-Compatible Hobby OS Running Atop Btrfs | daily.dev og:description: Mark Harmstone, known for his Btrfs driver for Windows, has released version 1.0 of Moxnox, a hobby operating system. Moxnox models its system calls after... og:url: https://daily.dev/posts/moxnox-nt-like-posix-compatible-hobby-os-running-atop-btrfs-3t0zica9x og:image: https://api.daily.dev/og/posts/3T0ZIcA9X.png og:image:alt: Moxnox: NT-Like, POSIX-Compatible Hobby OS Running Atop Btrfs 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. # Moxnox: NT-Like, POSIX-Compatible Hobby OS Running Atop Btrfs **[Phoronix](https://daily.dev/sources/phoronix)** · 2 min read · 0 upvotes · 0 comments ## Summary Mark Harmstone, known for his Btrfs driver for Windows, has released version 1.0 of Moxnox, a hobby operating system. Moxnox models its system calls after Windows NT while staying POSIX-compatible, and it runs on the Btrfs file system. The project is about 130k lines of C++ and targets AMD64 and AArch64, specifically x86_64-v3. It can self-host and run Unix-like software, with ported tools including Bash, GCC, CMake, Zstd, and Git. There's no GUI yet, and it can't run Windows EXE files. Harmstone says AI only helped with mechanical porting work, not substantive code. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is Moxnox and how does it relate to Windows NT and POSIX? Moxnox is a hobby operating system created by Mark Harmstone whose system calls are modelled after Windows NT while also being POSIX-compatible enough to run Unix-like software. It runs atop the Btrfs file system, is about 130k lines of C++, targets AMD64 and AArch64 (x86_64-v3), and reached version 1.0. _Developers tracking unusual OS projects can follow releases like this one on daily.dev._ ### Does Moxnox 1.0 support a GUI or running Windows executables? No, Moxnox 1.0 has no GUI support and, despite modeling its syscalls on Windows NT, it cannot yet run Windows EXE programs. Ported software so far includes Bash, GNU utilities, GCC, CMake, Zstd, and Git, and testing is easiest inside QEMU due to limited hardware and driver support. _Hobby OS enthusiasts weighing what a new kernel can actually run follow milestones like this through daily.dev._ ### Was AI used to write the code for the Moxnox operating system? Mark Harmstone stated that none of the 'substantive code' in Moxnox was written via AI, saying it was only used to help with mechanical tasks like porting and translating code. The rest of the roughly 130k lines of C++ was written by him over the past few years. _Developers curious how much of a project's code is AI-written can keep tabs on disclosures like this via daily.dev._ ## Similar posts on daily.dev - [Rust-Written Redox OS Sees Improvements For Running On Real Hardware](https://daily.dev/posts/rust-written-redox-os-sees-improvements-for-running-on-real-hardware-kxl0txsw1) · Phoronix · 116 upvotes · 7 comments - [This Month in Redox](https://daily.dev/posts/this-month-in-redox-txywbaawn) · Lobsters · 25 upvotes · 0 comments - [Fuzix: Because Small Is Beautiful](https://daily.dev/posts/fuzix-because-small-is-beautiful-nyb6pwozi) · Hacker News · 2 upvotes · 0 comments - [Not Every Open Source OS Needs to Be Based on Linux, and These Six Aren’t](https://daily.dev/posts/not-every-open-source-os-needs-to-be-based-on-linux-and-these-six-aren-t-jdafoeixg) · It's Foss · 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 --- Tags: [#linux](https://daily.dev/tags/linux), [#c++](https://daily.dev/tags/c++) [View this post on daily.dev](https://daily.dev/posts/moxnox-nt-like-posix-compatible-hobby-os-running-atop-btrfs-3t0zica9x) ```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":"Moxnox: NT-Like, POSIX-Compatible Hobby OS Running Atop Btrfs","url":"https://daily.dev/posts/moxnox-nt-like-posix-compatible-hobby-os-running-atop-btrfs-3t0zica9x","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/moxnox-nt-like-posix-compatible-hobby-os-running-atop-btrfs-3t0zica9x"},"datePublished":"2026-10-26T10:14:28.113Z","dateModified":"2026-10-28T09:00:00.834Z","description":"Mark Harmstone, known for his Btrfs driver for Windows, has released version 1.0 of Moxnox, a hobby operating system. 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