> But (re my earlier response) why use a transistor at all? So it's OK to short MCLR to ground with a pushbutton switch that was also shown on the schematic. The transistor is required unless the MAX232 5V-side output is open collector, which I didn't think it was. I don't have the spec sheet in front of me right now. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu