In my experience, CAOD can be played on a system with XP and 1 gig RAM, if your total available memory (which is RAM+swap) is less than 2 gigs. Still, using an emulator and running it on an older OS inside that emulator may be preferable (also because the emulator is likely to be slower, which removes some control problems that might occur on fast PC's, like not being able to make small corrections.
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