Looking at the pinout diagrams, I don't see any conflicts there. But watch out for the voltage; the Nano is usually operated at 5V, while the RP2040 is a 3V3 chip and its inputs are not 5V tolerant.
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Does anyone know whether the Arduino Nano in the uBitx 6 could be replaced with an Arduino Nano RP2040 Connect without any other hardware changes? I realize the software would have to be adjusted, but are there any pin conflicts that can't be resolved in code?
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73,
Mark, N8ME