From what I remember the Amax cartridge is a hardware dongle with roms and a floppy interface for the Amax application software. You will need that application to go with your cartridge.
I would start with one of the AMAX10 (1.0) files on the page plus the Utilites software. Might just as well download all the version 1.0 stuff and start playing around. The files aren't that big. Some of the .zip files on that page seem to actually be .DMS files with the wrong extension. Try renaming any .zips if you have problems.
Sounds like fun,
Good Luck