by Reader Will Dawes would like to have a foot in two worlds. He writes:
I have an iMac that’s a couple of years old on which I run Mac OS X Snow Leopard. I’ve stuck with Snow Leopard because I need to run a couple of old PowerPC applications on it that don’t work under Lion or Mountain Lion. But now I find myself in a position where I also need to run Mountain Lion for a job I’m working on. Is there a way to run each on a single Mac?
Yes, at least two ways. The first is to purchase an external hard drive, format it for your Mac, and install Mountain Lion on it. When you need to swap between operating systems, simply launch System Preferences, select the Startup Disk preference, and choose the disk that contains the operating system you need.
Of course, this requires that this Mac is compatible with Mountain Lion. Mountain Lion demands one of these Macs:
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