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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
Hi,
You can find the schematics listed on the Pico page: https://www.espruino.com/Pico#information
Also, the F4 chips have a USB bootloader, so it's not a big deal to write the firmware on to them: https://www.espruino.com/Pico#advanced-reflashing
(Also, I'm moving this into the 'porting to new devices' section)
It's not horrible, but I can't really help you out much more than what's above - if it was massively easy to do then nobody would bother buying Espruino boards :)