> The PICList.org website has an 8 bit version to do this

How about subtract 100 from the number until the 9th bit is clear,
then use the 8-bit routine to get the rest. Add the number of subtracts
to the 100's digit. That would be a maximum of 4 subtracts, to find
256 - 300, 301 - 400, 401 - 500 and > 501

wbr
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