# tgrysztar/fasm

flat assembler 1 - reconstructed source history

Repository: https://github.com/tgrysztar/fasm
Canonical: https://ross.abutalabs.com/products/fasm
Language: Assembly
License: NOASSERTION
License Family: other
Topics: fasm, assembly, x86, x86-64
Last push: 2026-02-24T12:17:59+00:00

## Health v2 (maintenance only)
Score: 63/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 69, release rhythm 35, longevity 100
- inputs: {"age_days": 2179, "days_push": 190, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1739, forks 65 (observed 2026-08-28T04:05:30.067551+00:00)

## What it is
flat assembler (fasm) is a fast self-assembling assembler for x86 and x86-64 that generates executable files directly. This repository holds the reconstructed source history of fasm 1 dating back to 1999, with binary releases available on the official website.

## Use cases
- assemble x86-64 assembly source into executables
- compile small operating system kernels and bootloaders
- write low-level code without a linker
- study the source history of a long-lived assembler
- generate flat binary images for embedded x86 targets

## When to choose
- you need a lightweight, self-contained assembler with no external dependencies
- you target x86/x86-64 and want direct binary or executable output
- you want a fast assembler for OS development or tiny binaries

## When to avoid
- you need multi-architecture support beyond x86/x86-64
- you want a modern toolchain with integrated linker and debugger
- you need a license with clear redistribution terms (license is non-standard)

## Facets
- artifact type: cli-tool
- maturity: stable
- function: compiler, developer-tools
- domain: programming-languages, compilers, developer-tools
- platform: windows, cross-platform, cli
- tags: assembler, x86, x86-64, flat-assembler, assembly-language, source-history, command-line, linux, macos

## Member repositories
- tgrysztar/fasm (main) score 63

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:30.067551+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 2026-08-30T03:30:14.662108+00:00, confidence not recorded.
  - readme: https://github.com/tgrysztar/fasm (fetched 2026-08-28T04:05:30.067551+00:00, sha 0367c60d8d08)
- Data as of 2026-08-30T08:39:29.467469+00:00.