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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.
@AkosLukacs
The nRF52840 possibility was removed from their wiki last october or november. If you think about it: that's not a drop-in replacement: much more pins => needs a new PCB. Has USB => one would expect it to work => needs a new case with USB pins broken out and work on USB driver. That's a new watch IMO...
Hardware is mostly documented, as linked by fanoush https://wiki.pine64.org/index.php/PineTime#Driving_the_peripherals
1 important thing: The LCD is on an SPI bus (8MHz max) compared to the F18's parallel bus, it's not fast: https://www.youtube.com/watch?v=_x6B-L5KOtU