# nuta/operating-system-in-1000-lines

Writing an OS in 1,000 lines.

Repository: https://github.com/nuta/operating-system-in-1000-lines
Canonical: https://ross.abutalabs.com/products/operating-system-in-1000-lines
Homepage: https://1000os.seiya.me
Language: C
License: NOASSERTION
License Family: other
Last push: 2026-07-16T11:55:10+00:00

## Health v2 (maintenance only)
Score: 60/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 92, release rhythm 8, longevity 81
- inputs: {"age_days": 1135, "days_push": 48, "days_rel": 585, "gap_med": null, "n_releases_24m": 1}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3616, forks 299 (observed 2026-08-28T04:08:11.751629+00:00)

## What it is
An open-source educational book and reference implementation that teaches how to write a minimal operating system in 1,000 lines of C. It is available as a multilingual website with accompanying source code.

## Use cases
- learn how operating systems work from scratch
- write a toy kernel in C
- understand bootstrapping and bare-metal programming
- study memory management and context switching basics
- find a hands-on OS development tutorial

## When to choose
- you want a short, approachable introduction to OS development
- you prefer learning by reading a guided tutorial with reference code
- you want a multilingual educational resource

## When to avoid
- you need a production-ready operating system or kernel
- you want comprehensive coverage of drivers, networking, or filesystems
- you need an OS for commercial deployment

## Facets
- artifact type: learning-resource
- maturity: stable
- function: documentation, developer-tools
- domain: operating-systems, tutorials, education, embedded-systems
- platform: windows, cross-platform
- tags: operating-system, tutorial, book, c, bare-metal, risc-v, kernel, linux, macos

## Member repositories
- nuta/operating-system-in-1000-lines (main) score 60

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:11.751629+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:33:34.931874+00:00, confidence not recorded.
  - readme: https://github.com/nuta/operating-system-in-1000-lines (fetched 2026-08-28T04:08:11.751629+00:00, sha f57fe133adf5)
  - homepage: https://1000os.seiya.me (fetched 2026-08-29T09:26:39.947360+00:00, sha 6439633122d8)
- Data as of 2026-08-30T08:39:29.467469+00:00.