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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.
@Gordon
Hi Rek,
It does sound like a driver problem rather than anything to do with the board... If it doesn't have a COM port assigned (eg. COM20) in 'devices and printers' then the Web IDE won't be able to pick it up.
Did you actually run the executable after installing the drivers? The file you download is a zip, then you run the setup executable from it, and then you have to go to the directory you installed to and run another executable. I'm not entirely sure why it's so complicated, but that's what ST provide :(
If that doesn't work, you could go to the device in 'devices and printers' and choose to manually update the driver, then point it at the directory that you installed the drivers in.