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What is the J5/ISP jumper useful for?

April 26, 2017ISP j5 Jumper useful

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What is the J5/ISP jumper useful for?

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Nothing really. It was originally included just in case the DTR/RTS serial control circuitry for automatically driving the RESET and ISP signals didn’t work. The serial port controls work fine though, so there is really no need for the J5/ISP jumper. We will probably remove it on pre-assembled kits in the future. The reset button is also not really necessary either, since the PC can control the RESET signal through the serial port’s DTR signal.