Ophis

A cross-assembler for the 6502 series of microprocessors.

Project maintained by michaelcmartin Hosted on GitHub Pages — Theme by mattgraham

Ophis is an assembler for the 6502 microprocessor - the famous chip used in the vast majority of the classic 8-bit computers and consoles. Its primary design goals are code readability and output flexibility - Ophis has successfully been used to create programs for the Nintendo Entertainment System, the Atari 2600, and the Commodore 64.

A complete manual is available as PDF or online as HTML.

Downloads

Ophis is on PyPI. On any system with Python and Pip installed the command pip install --user ophis-asm (or whatever variations your local install demands) will install the latest version. It does not include the documentation or example code.
The documentation and sample code is available as a separate download.
The standalone Windows installer requires no additional software to be installed. It contains all the examples and documentation. You will probably want to add the install directory to your PATH to make it easier to invoke from the command-line.