Scott, Did you ever find out the real answers from mchip on exactly how all of the 18Cxxx instructions work? I remember you bringing up several examples of ambiguous instructions,but don't recall any final conclusions. Sean | | Sean Breheny | Amateur Radio Callsign: KA3YXM | Electrical Engineering Student \--------------=---------------- Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 mailto:shb7@cornell.edu ICQ #: 3329174