tass64 ☆

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Description:
Multi pass optimizing macro assembler for the 65xx series of processors

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: assembly 6502 c64 retro-computing macro-assembler

Install: brew install tass64

About:
TASS64 is a multi-pass optimizing macro assembler specifically designed for the 65xx series of microprocessors. It features a powerful macro system, built-in linker capabilities, and supports multiple output formats including C64 PRG. The tool is highly optimized for producing compact and efficient machine code for classic 8-bit architectures.

Key Features:

Multi-pass optimization for code efficiency
Advanced macro processing and conditional assembly
Built-in linker and support for multiple output formats
Cross-platform support (Linux, Windows, macOS)

Use Cases:

Developing software and games for Commodore 64 and other 6502-based systems
Creating optimized assembly routines for embedded 65xx controllers
Porting and maintaining legacy 6502 assembly codebases

Alternatives:

ca65 – Part of the cc65 suite; more standard but TASS64 has specific optimizations for C64 development.
dasm – Another popular cross-assembler; TASS64 is often noted for its superior macro capabilities.

Version History

Detected	Version	Rev	Change	Commit
Sep 11, 2025 10:12am		0	VERSION_BUMP	ab8f0843
Sep 12, 2024 11:37pm		0	VERSION_BUMP	9289ba9b