Thanks to Hugh for the discussion about it. Wikipedia has an overview https://en.wikipedia.org/wiki/JTAG
I have found a third Arduino UNO that I didn't know that I had so I am ready to try again. My 3D printer board has an AtMega1284p. I will have to investigate how I can get the Marlin firmware from the Arduino IDE into the JTAG communications. Life is a real learning experience. Peter. -- Next meeting: Online, Jitsi, Tuesday, 2022-12-06 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
