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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
Great news! It's worrying that it doesn't work on your new Mac - I guess it could be a driver problem... I think some of the boards tend to use a cheap PL2303 USB-serial convertor that might be a knock-off of the 'real' Prolific one.