> So the example used A4 for the Dallas 1-wire for convenience would
> you say, or was there another reason?  (My example used A4 to pull
> the line down, and Bx to read it.)

As the line had a pull-up on it, any pin would have done. In fact it may
have been less convenient from a h/w POV to use A4 as you'd need
to add an external pull-up. PortB has enableable (!) 200uA pull-ups, but
I'm not familiar with the DS18S20 and can't say whether that is enough
to pull it up. It wouldn't do for I2C for example, so maybe an external
pull-up is needed whichever pin you use

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