I had a Z3 and I also upgraded the ROM to 8 or 8.5. The chip was a s27c256-15a. I have the rom image on a CD somewhere. I will be looking for it. I think I just got in from the Aminet years ago. I don't see it now on aminet. I sold my z3 but I know who has it so worst case scenario is we dump that rom. It did not upgrade the ability to use more RAM but it did work with the 060 and fixed the scsi CDDA audio problem.