atasm ☆

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Description:
Atari MAC/65 compatible assembler for Unix

Type: Formula | Latest Version: 1.09@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: retrocomputing atari assembly 6502 cross-compiler

Install: brew install atasm

About:
atasm is a cross-assembler designed to produce object code compatible with the Atari MAC/65 development environment. It enables developers to write and assemble 6502 assembly language on modern Unix-like systems, generating files that can be transferred to Atari 8-bit computers for execution. This tool is essential for retrocomputing enthusiasts and developers maintaining or creating software for the Atari 8-bit family.

Key Features:

Cross-platform compatibility for Unix systems
Generates MAC/65 compatible object files
Supports standard 6502 instruction set
Command-line interface for scripting and automation

Use Cases:

Developing new software for Atari 8-bit computers on modern systems
Porting existing Atari assembly projects to Unix-based workflows
Retrocomputing hobbyist projects and game development

Alternatives:

MADS – MADS is another popular cross-assembler for Atari 8-bit, often considered more feature-rich with macro support, but atasm specifically targets MAC/65 compatibility.
DASM – DASM is a versatile multi-platform cross-assembler that supports 6502, but it is not specifically designed for MAC/65 compatibility.

License: GPL-2.0-or-later

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, arm64_ventura, arm64_monterey, arm64_big_sur, sonoma, ventura, monterey, big_sur, catalina, arm64_linux, x86_64_linux

Version History

Detected	Version	Rev	Change	Commit
Sep 13, 2025 1:16pm	1.09	0	VERSION_BUMP	4c8a5115
Nov 25, 2022 3:52am	1.09	0	VERSION_BUMP	76556e2c