Yes, most if not all came with Mac OS 9 pre-installed. [EDIT] I just re-checked ...

		Cockbrand on Jan 7, 2023 \| parent \| context \| favorite \| on: The all in one web editor for M68K Yes, most if not all came with Mac OS 9 pre-installed. [EDIT] I just re-checked - up to and including the "Mirrored Drive Doors" models, all PowerMac G4 models could boot into Mac OS 9.