8.1 Rom — Mac Os

If you own a Power Macintosh 7300 or a 8600, the ROM is physically on the motherboard. You cannot change it. Mac OS 8.1 will either work or it won't. To run 8.1 on these machines, you need a specific ROM revision (typically version $77D.35F1 or later). If your physical ROM is too old, the 8.1 installer will refuse to run.

Released in January 1998, Mac OS 8.1 marked a major milestone in Apple’s history. It was a hybrid OS that supported both the older chips and the newer PowerPC architecture. mac os 8.1 rom