It was a 1GHz PowerBook G4/15", so yes - can boot OS 9 natively. I don't know how much it really needs in the way of anything in the way of "special" drivers, but at the time I didn't have the 9.2.1 cd I've got now, so the tibook restore dvd was my only install method anyway.
As far as coexisting goes, it works fine for the first week or two, but my installs were getting up there in the months, and I had been doing a lot of rebooting between OS9 and OSX, because I rarely use classic mode.
None of my reboots were violent in any way, I always closed down my apps, then rebooted using the startup disk control panel.
Then, one day, it wouldn't boot OS X. Not sure how, or why, but it wouldn't. Luckily a reinstall-in-place worked fine, but it was at that point that I decided never to use a production system with both OS X and 9 on it.
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As far as coexisting goes, it works fine for the first week or two, but my installs were getting up there in the months, and I had been doing a lot of rebooting between OS9 and OSX, because I rarely use classic mode.
None of my reboots were violent in any way, I always closed down my apps, then rebooted using the startup disk control panel.
Then, one day, it wouldn't boot OS X. Not sure how, or why, but it wouldn't. Luckily a reinstall-in-place worked fine, but it was at that point that I decided never to use a production system with both OS X and 9 on it.
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[Insert Cool Signature here!]