Do you have the ROM open in Notepad or some other program? Try closing that before launching the game. Maybe try renaming it to 1.z64 and then running the game with --rom-file 1.z64. Ensure that in ...
I'm a bit confuzeled as to the specifics of the Mac OS ROM file in OS 9. It is my understanding that prior to 9 (or maybe earlier) the ROM on the chip was no longer used by the OS, but rather it uses ...