There have been chips in the past where there was some strange interaction = with between port A and Port B that meant some bits of the a port (I can't = remember which one) were not usable in some situations. I think you are at the 'contact the FAE, here are the symptoms, what is the= problem' point. --=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 .