Quote:
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By now you may understand that FF is the highest number in a byte (in hex), just like 99 is the highest number out of a 2 digit decimal number. Adding 1 to 99 (in decimal) results in 100, for hex it would be the same thing, adding 1 to FF (in hex) results in 100.
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Wrong.
If you add 1 to $ff, you don't get $100, you get ZERO, as its on a byte boundary, and he quite explicitly is stating about bytes.
You would only get $100 if you were dealing with a word or a longword.