On Fri, Aug 28, 2015 at 4:19 AM, wrote: > I originally thought it was to shift the carry bit around, but that can't= be it. > > So I don't understand it either without modelling it. Good to know I'm not the only one! My C skills aren't that stellar, so I tend to doubt myself first as I'm usually just not understanding something obvious. Nice to see that sometimes I'm not understanding something that's less obvious! Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .