# cfenollosa/os-tutorial

How to create an OS from scratch

Repository: https://github.com/cfenollosa/os-tutorial
Canonical: https://ross.abutalabs.com/products/os-tutorial
Language: C
License: BSD-3-Clause
License Family: permissive
Last push: 2026-02-04T09:33:56+00:00

## Health v2 (maintenance only)
Score: 62/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 65, release rhythm 35, longevity 100
- inputs: {"age_days": 4356, "days_push": 210, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 30673, forks 3559 (observed 2026-08-28T04:11:54.553796+00:00)

## What it is
A step-by-step tutorial teaching how to build an operating system from scratch in C and assembly, from writing a boot sector up to basic kernel features. It consists of short, code-heavy lessons with minimal theory, aimed at programmers curious about how OSes work.

## Use cases
- learn how to write an OS from scratch
- build a boot sector in assembly
- write a simple kernel in C
- understand how operating systems boot
- hands-on operating systems tutorial
- learn low-level x86 programming

## When to choose
- you want short, practical, code-first lessons on OS development
- you prefer minimal theory and quick exercises
- you want to start from a boot sector rather than reading an existing kernel

## When to avoid
- you need a modern, authoritative OS design resource - the project is explicitly abandoned with known technical and design issues
- you want deep theoretical coverage of OS concepts
- you need production-quality OS code

## Facets
- artifact type: learning-resource
- maturity: abandoned
- function: developer-tools, documentation
- domain: operating-systems, tutorials, education
- platform: cpp, cli
- tags: os-development, bootloader, kernel, tutorial, low-level-programming, assembly, x86, linux

## Member repositories
- cfenollosa/os-tutorial (main) score 62

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:54.553796+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 2026-08-29T16:52:44.615199+00:00, confidence not recorded.
  - readme: https://github.com/cfenollosa/os-tutorial (fetched 2026-08-28T04:11:54.553796+00:00, sha e09056311241)
- Data as of 2026-08-30T08:39:29.467469+00:00.