I've read on Everymac that the earliest iBook Clamshells came loaded with Mac OS 8.6, not OS 9. Apparently, only the 300MHz models released prior to the release of OS 9 (so from July – approx. late October 1999) were shipped with Mac OS 8.6.
I know it's almost a trademark rule that Apple computers cannot run an earlier version than the one they shipped with... but was this true in 1999? Could later iBook Clamshells – the post-October 1999 300MHz models, as well as the higher MHz models (and other newer G3s) – install OS 8.6 from a CD/USB?
P.S. this is a similar problem to the iMac G4 15" 800Mhz models – without any change to specs at all, the earlier ones shipped with OS 9 installable, and later ones allowed OS X only, requiring a hacked installer for it to work.
I know it's almost a trademark rule that Apple computers cannot run an earlier version than the one they shipped with... but was this true in 1999? Could later iBook Clamshells – the post-October 1999 300MHz models, as well as the higher MHz models (and other newer G3s) – install OS 8.6 from a CD/USB?
P.S. this is a similar problem to the iMac G4 15" 800Mhz models – without any change to specs at all, the earlier ones shipped with OS 9 installable, and later ones allowed OS X only, requiring a hacked installer for it to work.