> Only if it puts VPP on before VCC, or does not change a pin input output > state while reading/verifying. I don't think this is the case, but I will doublecheck. > Make sure your power, VCC and GND, appear right at the PIC pins. From all my testing, this check out. > Is VPP appearing on other pins as well as MCLR? I pulled the chip off the socket and onto a breadboard I ran wires only to the pins necessary. > Do the chips get hot if VPP is isolated? I'm not sure what you mean by this. > Can you program it in LVP mode? I briefly messed around with this, but I was doing some pretty hackish things. I couldn't get the chip to program and verify, but the contents of the chip would change after I programmed it. (just not in a very repeatable way.) Maybe I will look into setting this up in a more correct way. > It's quite possible that the chips were faulty in the first place, maybe > static damage?? Yes, I suppose it's possible, but I'm doubtful. I had 5 16f628 (I believe they all got hot), and they came packaged correctly, etc. I also have tried 1 16f877 (different order) which was also packaged correctly. The 877 doesn't get hot, though. I can program 16f84s at will. Frustrating. -Steve -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu