Good day to all. I'm working on a project that uses a 16F1782 that is always connected=20 to a battery. It is necessary that I be able to reprogram the chip=20 after it has been sealed into its enclosure. To that end, I am=20 leaving a series of small holes in the enclosure such that I can use=20 pogo pins to touch pads on the PCB within the case. The holes are=20 sealed with a removable covering (Kapton tape under adhesive velcro). I want to use standard chip programming hardware: PICkit3 or ICD3 in=20 standard High-Voltage programming mode. However, I don't know if it=20 is necessary for power to be removed from the PIC before the=20 programming sequence starts. Does anyone know if removing power is necessary before programming=20 the chip? If not, can anyone point me towards resources that will tell me? Many thanks! dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=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 .