Another thing that I'd be curious to know is whether the USB drivers that came with the iMac version of 8.1 supported USB chipsets other than the one that came with the iMac (OPTi FineLink 82C861), and whether it supported USB Mass Storage....while yes, the version of OS 8.1 that came out with the Rev. A iMac did support USB, I seem to remember that it had only very basic USB support, as it wasn't long before the release of 8.5.