From the Diecimila description page:
Each of the 14 digital pins on the Diecimila can be used as an input or output. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms.
I am trying to use the Wire library on pins A4 & A5 - does the Wire library enable these resistors or do I have to do it? If so, how?