I forgot that it could boot to 6.0.3 from ROM - man that's reason to own a Classic right there! I know it's a stripped down version, but I think it's pretty cool.

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Can't you startup from ROM and then modify it or load a new RAM disk from the HD (or floppy) then restart from a full System RAM disk too? It's just a fantastic option to have.

Apple really should have included a minimal system disk in every ROM for the specific purpose of running diagnostic and disk utilities by the consumer.