Herbert Graf wrote: > Otherwise, any ICSP programmer > that allows for the target to supply power can theoretically support > ICSP below 5V. Or the other approach is to let the programmer supply power. All mine do this so that they can set Vdd to 5V to do a bulk erase. You do have to design your power supply to be tolerant of this. It might also mean separating the PIC supply with diodes. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist