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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
Hmm - it'd be interesting, but I guess the register contents aren't FRAM, so if you just cut the power in the middle of something you've probably still got a lot of work before you can 'just resume'.
ST do make an STM32L0 (I think?) with crazy low power RAM - so the whole thing can go into standby mode (basically totally off) but with the RAM still holding data. A module with that and a supercap/coin cell on board would work pretty well.
Actually if you wanted a nice easy way to add FRAM, maybe we could come up with a 'shim' for the Pico that'd just solder onto the 0.05" pins. While it's not super-fast, it's probably still a big help for storing anything nonvolatile.