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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, those should work - if you look at this page http://www.espruino.com/Other+Boards you might be able to use a firmware from another board that contains more or less the same chip.
Otherwise as @allObjects says you'll want to make your own
BOARD.pyfile in https://github.com/espruino/Espruino/tree/master/boards and rebuild it for your device - it shouldn't be too painful - there's a bit of info in GitHub: https://github.com/espruino/Espruino#modification