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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
I'm afraid that's not going to be possible right now - to do it, Espruino would have to act as an SPI (or possibly SDIO) slave, which just isn't possible right now.
In the future it might be possible for Espruino to emulate a USB Mass Storage device though, but I'm afraid that's quite far down the priority list.