Mac Mini doing fast OS switching

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UPDATE: it looks like it would only cost an additional about 78$ for a 512Meg RAM chip to bring this puppy up to 1G total. OS X seems to ‘need’ at least 1G RAM in my experience, plus this would be way more than enough to run a few OSs at once, or at least the ones I need; OS X and Linux. Looking around it seems that replacing the RAM is quite the adventure! Time to find my tweezers.