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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, it'd just be using peek and poke.
I'm not sure I understand the question? If you're using something like the Pico then there's a 128kB page at the end of flash that you can write the data into though.