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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
It's just on the Espruino board at the moment. There's no real reason why it can't work on other (especially F103) boards but I'm not putting the effort into checking it or enabling it because it'll just be a support nightmare.
Add to this the fact that a lot of other boards use voltage regulators that themselves draw a lot of current (a few milliamps) and the power savings on those boards won't be huge.