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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
Sounds like the addresses for the saved code area (in BOARD.py) need tweaking - it's odd though as I was pretty sure I had it working on nRF52840.
I've definitely been considering nRF52840 - although IMO users aren't really hitting any big issues with nRF52 that the 52840 would fix. USB would definitely be nice though!