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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
So are you the designer of that board, and also bobricius on tindie/GitHub?
stm32f072cb looks like a really interesting chip (especially the crystal-less USB). I don't see why Espruino wouldn't work on it, although in 128kB some functionality would have to be removed. If an external eeprom/flash could be added, the saved code could go into that instead, and it'd free up another 20kB of program memory for Espruino.
Having said that there are a lot of ways that memory usage could be reduced too. It just needs someone to spend some time and find the main culprits and fix them.