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Hi - if anyone can please comment/assist. This is an outstanding site & resource, but less so if I cannot make bootable CDs from the Mac OS's available. Specifically, I downloaded Mac OS 8.6, unzipped it and obtained the OISO file. Pretty straight forward I thought. On my macbook OS X, just burn the ISO file to CD. Worked fine, CD has all the correct files. But my legacy powermac that I need it for. But it will NOT boot, no issues with powermac, I can boot from a retail OS CD no issues. IS there something specific I need to do that I am missing to create a bootable OS CD from these files or on my Mac (OS 10.11.6)