Hi Olin, Ok, you're cliff-hanging me here -- this is worse than waiting for the answer to the daily Jumble (TM): > As I said, I've already solved the problem. I posted it because I thought > some here might find it interesting. It had me stumped for a whole day. I know -- I read you message several times, but I won't lose respect for you if you ask for help from time to time. Everybody needs help at some time or another. It is not a sign of weakness to ask for help. > > 4) Signal line ringing issues due to improper line termination? > > Perhaps 270 ohm series resistors instead of 2000 ohm resistors? > > I don't want to go much below 2Kohm for other reasons, but you're getting > close. No characteristic impedance problems? Ground bounce? Adding some resistance (~25 ohms) in the ground lead between your programmer and the target? At least give me a few hints... :) Best regards, Ken Pergola -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.