> Ok I am sending an on/off signal from a 16f876 Port C.2 to a 16f877 Port > B.2 and my master program does not see it. Is that because it's not there or because the master has a bug? Look at the line with a scope or artificially create the signal with a switch. This will at least isolate the problem to the master or the slave. It seems pointless to go digging around in the code until you know which unit is having the problem. ******************************************************************** Olin Lathrop, embedded systems consultant in Littleton Massachusetts (978) 742-9014, olin@embedinc.com, http://www.embedinc.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads