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  • With the Web IDE, did you click the 'connect' button in the top left? If you're not connected then the terminal won't react.

    Also, you say you used /dev/tty... - what about /dev/cu...? Sometimes I think you may need to use that on Macs.

    It's possible that the Mac is actually trying to take control of the Pico and use it as a modem (you could check in settings and see if that's happening?). It would explain the issues you were having with screen too.

    For the external button, after using pinMode(B4, "input_pulldown");, does digitalRead(B4) return 0 when not pressed and 1 when pressed?

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