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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
You couldn't get the data into it fast enough for that I'm afraid - for that kind of thing you'd be looking at writing your own C code and then maybe integrating that in to Espruino.
It is possible to set up DMA directly from JavaScript, and you could for example stream from flash memory at that speed - but it'll require you reading the chip datasheet and poking around with registers.