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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.
@Dennis
From my experience with other NAND flash memories, I would strongly assume that you can only erase a whole page, because that's the way they work. There are non-volative RAMs out there as well, without that limitation, but they are much more expensive.
I'm not sure about this particular chip though.