OSle – A 510 bytes OS in x86 assembly
(sorry about double posting, I forgot to put Show HN in front in the original https://news.ycombinator.com/item?id=43863689 thread) Hey all, As a follow up to my relatively successful series in x86 Assembly of last year[1], I started making an OS that fits in a boot sector. I am purposefully not doing chain loading or multi-stage to see how much I can squeeze out of 510bytes. It comes with a file system, a shell, and a simple process management. Enough to write non-trivial guest applications, like a text editor and even some games. It's a lot of fun! It comes with an SDK and…
In plain words
OSle is a fully functional operating system written in x86 assembly that fits entirely within 510 bytes of a boot sector. It includes a file system, shell, and process management, allowing developers to create applications like text editors and games. The project targets programmers interested in low-level systems programming and assembly language, offering an SDK and browser-based sandbox for experimentation and learning about OS development.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
(sorry about double posting, I forgot to put Show HN in front in the original https://news.ycombinator.com/item?id=43863689 thread) Hey all, As a follow up to my relatively successful series in x86 Assembly of last year[1], I started making an OS that fits in a boot sector. I am purposefully not doing chain loading or multi-stage to see how much I can squeeze out of 510bytes. It comes with a file system, a shell, and a simple process management. Enough to write non-trivial guest applications, like a text editor and even some games. It's a lot of fun! It comes with an SDK and you can play around with it in the browser to see what it looks like. The aim is, as always, to make Assembly less scary and this time around also OS development. [1]: https://news.ycombinator.com/item?id=41571971
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