Simpler, Faster, Better. This is by far the simplest, most flexible SNES cross assembler there is. You can both hack ROMs and create new homebrew SNES ROMS with this tool. Take it from an SNES hacking veteran of 10 years, this tool is GOOD!

Newer versions have been released, however contain poor documentation, and removal of features that can be found in .06. Version .06 is still considered the best version available by most ROM hackers until the author addresses the shortcomings of subsequent versions.