Taking a screenshot of the entire display is exactly the same in OS 9 as it is in OS X - Command-Shift-3. Command-Shift-4 allows you to take a screenshot of a specific part of the …
For those bidding on this Mac - it isn't a Hyperdrive. I asked the seller for a close-up of the front and it's actually the Macintosh badge from the back of the machine.
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