the only explanation i can find about programming the DUE from the Arduino IDE is the following. it clearly says that the 16U2 is supposed to do whatever is needed to insure programming...Programming port: To use this port, select "Arduino Due (Programming Port)" as your board in the Arduino IDE. Connect the Due's programming port (the one closest to the DC power jack) to your computer.
do you consider _s to be special characters?
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via Egeo 16