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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! Glad that sorted it!
It's left over from when filenames were limited in length to 8 characters - so I used 0..9, A..Z to allow one character in the filename. It's something I've been meaning to improve on.