mac os 9 platforms?



can anyone tell me the different platforms on which mac OS 9 will work? eg. whether it works on G3 or G4 etc plus all the variations of these (G3 or G4) on which these work.
i want to write a driver for third party pci card. so i would like to know the Hard disk limitation which i have to keep in mind while writing the driver for G3 or any other platform on which mac os 9 will run.
also whether mac OS 9 support ATAPI devices.


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