> I'm now having problems doing the conversion the other way though(!). I
need to convert three 8bit values (hundreds, tens, units - maximum values
for each of these bytes are 3,5,9 respectively.) into a single byte
(integer) value in the decimal range 0-114

Your problem statement is inconsitant.  If the resulting value is in the
range of 0-144, then how can the hundreds value be as high as 3?

Maybe I'm missing something here, but this seems like a very simple problem.
Isn't the result = HUNDREDS * 100 + TENS * 10 + UNITS?  If HUNDREDS is
always either 0 or 1, then the first term is either adding 100 or not.  The
second term is also a bit simplified if TENS is 0 thru 5.  The term value
can be looked up in a table since there are only 6 possible choices if you
don't want to call a multiply routine.


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