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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
No, the Pico has no pullups on it - so if the board you connect to doesn't have them you'll have to include some.
Also, do you have the up to date firmware (1v79) on your Pico? I know for a while there were some issues with I2C/SPI on certain pins, which have now been solved.