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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
Yes, you want the one next to LD2/PWR.
I'd look in the windows Device Manager and see if the USB port has actually been recognized as a serial port or if there's a problem with it.
If it wasn't recognized, maybe this will help you: http://answers.microsoft.com/en-us/windows/forum/windows_vista-hardware/prolific-pl2303-usb-to-serial-port-adapter-driver/1902e9e0-4af0-4f36-84bc-f487d4022f1f
I think those boards use a counterfeit USB to Serial converter on them. Prolific (the maker of the real chips) made the decision a while back to change their drivers so that they no longer worked with the counterfeit chip, and that could be causing you problems. You'll have to try and use a different driver that still works.