"shawn bright" <[EMAIL PROTECTED]> wrote 

> if i use i bitmask of 240 it will mask the most significant 4 bits

When using bitmasks its much easier to think in hex (or octal).
there are exactly 2 hex digits per byte so you only need to think 
about each group of 4 bits and its hex bit pattern. It saves a 
heap of mental calculations!

Alan G.

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