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I have read some conflicting sources about what pins have internal pullup resistors available for the Attiny85 microcontroller. Can all I/O pins work with INPUT_PULLUP, or just some of them? And if so, which ones?

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Check the datasheet, probably just search for "internal" or "pullup" enter image description here I believe there are little more pins/ports as portB, so they should all have internal pull ups.

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