It is also possible to boot OS 9 on Mountain Lion (Snow Leopard, Lion, etc), but you have to use Sheepshaver for that and frankly setting that up is a PITA. However, once that's done, it works.
Shop for your Apple, Mac, iPhone and other computer products on Amazon.
We are a participant in the Amazon Services LLC Associates Program, an affiliate program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.