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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
Right - I'm pretty sure I know what the problem is... Espruino starts in the bootloader - which is the original which still thinks the device is only 48kb - so that's what the stack pointer gets set up to.
Hopefully I should be able to make some tweaks and fix that though!