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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@tickTock
Hello,
do you have installed the ST-Link USB-Driver? If your board is connected to the USB a virtual com port is created. It appears in the windows device manager under "Ports (COM & LPT)" as "STMicroelectronics Virtual COM Port (COMXX)" where XX is the sequence number.
You can find find the drivers here.