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.