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Can you tell from the Apple System Profiler, System Profile Tab, Hardware Overview section? (You can get there by picking Apple->About This Mac and clicking the More Info... button or by running Apple System Profiler directly from the Utilities folder.)
 
just wondering because everyone is referring their system as either rev.a or rev.b
 
It is rev A since it has not been updated...say if the PowerBooks get updated next week like the rumors are saying, then those will be rev B, and so on.
 
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