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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
And I was right originally I'm afraid. The 4.9 compiler doesn't compile for the Espruino board for some reason (USB ends up broken). If you use the 4.8.4 compiler I linked then it should work.