can newer iBook run older OS?

[martin]

I may have an opportunity to buy a decent used iBook (12" screen), 
but I can't determine from Apple's site, if I can install OS9 on it. 
It currently runs some version of OSX.

My understanding is that Apple's firmware updates are designed to 
prohibit installing earlier versions of the OS (this happened to me 
on my old G4, and I found I couldn't install OS8.6 from the CD that 
came with it, once I'd upgraded to OS9). If that's the case, might it 
be possible to overwrite the firmware to "revert" it, allowing me to 
install an older OS on a newer machine?

I'll sleep just fine, even knowing that Apple doesn't want me running 
older OS on new machines :)

TIA
m
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