Ian McLean wrote: > Maybe you needed pull-ups on the PGD and PGC lines - on the target > side? These are driven with nice clean digital signals at the other end of 2Kohm resistors. Any appreciable pullup or pulldown would prevent the signal from going all the way to either rail due to the voltage divider between the pullup and the series 2Kohm. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.