Just out of curiosity, how is OS 9 installed (for Classic) on the newer machines that can't boot OS 9? As the only installers on the OS 9 CD are Classic apps, which you can't run without either booting off the CD or already having a Classic environment installed.

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I don't know how Apple did it before they shipped a new machine, (I would guess they use mass hard drive duplicators) but if I had to do it, I'd move the hard drive to machine that can boot from the 9 CD and do the install there then move the hard drive back to the original machine.