Originally Posted by
rubah ^ I didn't say it was expressed in hex, just that I could imagine why they would use an A to express a ten in the fifth place value

I mentioned binary because there would probably be a fixed number of bits allocated to store the data for the stats.
Neither did I. The guess I made up was based upon a Hex value basically rounding itself around about four and a half times (so F would go to 0, then back round to F again, then 0 again). I seemed to experience the same pattern when playing FF3 and maxing out my Gil from many hours training my OK's. Saying that it may be the case that the value could overflow, and beyond 65535, the value would reset itself to 0. I don't think the value would be marked as negative because 1: It's more space (by a bit) and 2: It's unnecessary, so it shouldn't reset to -65535.