# Install atasm with Homebrew, dnf, Nix

Atari MAC/65 compatible assembler for Unix. Version 1.30 via Homebrew; verified from local package data. Also installable with nix: nix profile install nixpkgs#atasm.

## Install

```sh
sudo av install brew:atasm
```

Additional install commands:

### macOS

- Homebrew (100%):

```sh
brew install atasm
```

  Evidence: local Homebrew formula metadata

### Linux

- dnf (92%):

```sh
sudo dnf install atasm
```

  Evidence: Fedora Rawhide package metadata: atasm from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/07190dc5ae9f35ae73866675fed6d95fe6e8d9fe22c9d7cdf85862cb2ed24a4c-primary.xml.zst

- Nix (92%):

```sh
nix profile install nixpkgs#atasm
```

  Evidence: nixpkgs package indexes: pkgs/by-name/at/atasm/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1

## Package facts

- **Package key:** brew:atasm
- **Package manager:** Homebrew
- **Version:** 1.30
- **Source summary:** Atari MAC/65 compatible assembler for Unix
- **Homepage:** <https://sourceforge.net/projects/atasm/>
- **Repository:** <https://github.com/CycoPH/atasm>
- **Generated:** 2026-08-03T19:37:03+00:00

## Executables

- atasm (alias)

## Install behavior

- Bottle: not available

## Freshness

- Page generated: 2026-08-03
- Package-manager version: 1.30
## Project history and usage

ATasm is a mostly MAC/65-compatible 6502 cross-assembler for Atari 8-bit development. It lets programmers write Atari assembly on modern hosts while producing Atari-native load objects, disk images, and emulator-related outputs.

### Project history

The README traces ATasm to Mark Schmelzenbach in 1998 and explains that it was created from a desire for a fast Atari-specific cross-assembler after using OSS MAC/65 on real hardware and finding other cross-assemblers lacked Atari-specific directives and conveniences. The current fork documents modifications by Peter Hinz from 2021 through 2025.

The version history records an initial public 0.90 release, GPL release at 1.00, Atari-specific output work such as XFD/ATR and emulator state-file support, undocumented opcodes, MAC/65 compatibility improvements, list/debug output, CC65 header generation, VS Code/Altirra bridge symbol dumps, long branches, trigonometry table helpers, procedure scopes, and .GUARD/.NOTIFY directives.

### Adoption history

ATasm occupies a niche but durable package-manager slot: retrocomputing developers need a small native assembler that can be scripted from makefiles and editors instead of running original Atari tools inside an emulator. The supplied metadata shows Homebrew, Fedora/DNF, and Nix packaging.

Its adoption is tightly connected to Atari emulator and cross-development workflows. The README explicitly names Atari800Win, Atari800, and Atari++ state-file targets, and later releases added outputs used by CC65 and VS Code/Altirra tooling.

### How it is used

The command is `atasm [options] <file.m65>`. Users enable undocumented opcodes, raw binary output, include paths, predefined symbols, XFD/ATR output, emulator state-file merging, symbol/list output, CC65 headers, ATasm include files, and JSON symbol dumps for editor integrations.

### Why package nerds care

ATasm is a compact example of why niche retro tools survive in general-purpose package managers: it is small, C-based, scriptable, compatible with old source idioms, and bridges modern build systems with emulator/debugger ecosystems.

### Timeline

- 1998: Original ATasm copyright and project origin.
- v0.90: Initial public release.
- v1.00: Package explicitly released under the GPL.
- 2019: v1.09 fixed multiple buffer-overflow CVEs.
- 2025: v1.30 added .GUARD and .NOTIFY directives.

### Related projects

- Related projects include OSS MAC/65, Atari800, Atari800Win, Atari++, Altirra, CC65, MADS-format source conventions, and VS Code Atari cross-development plugins.

### Sources

- Official git metadata from https://github.com/CycoPH/atasm.git
- <https://github.com/CycoPH/atasm#readme>
- <https://github.com/CycoPH/atasm/releases.atom>


## Security Notes

narrow executable package without higher-risk signals.

- **Geiger risk:** green / low
- narrow executable package without higher-risk signals

## Other Package-Manager Records

- Nix - atasm: normalized package name match | nixpkgs package indexes: pkgs/by-name/at/atasm/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1
- dnf - atasm - 1.30-5.fc45: normalized package name match | Fedora Rawhide package metadata: atasm from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/07190dc5ae9f35ae73866675fed6d95fe6e8d9fe22c9d7cdf85862cb2ed24a4c-primary.xml.zst | 6502 cross-assembler | https://github.com/CycoPH/atasm


## Combined YAML source

View the package source record on GitHub. [combined/atasm.yml](https://github.com/mxcl/pkgdb/blob/main/combined/atasm.yml)


## Sources

- pkg.so package database
- Geiger risk classifier
- curated package history
- pkgdb category and tag curation
- external package-manager database matches
- cross-ecosystem install command graph