On the Mega aren't the last 16:
I'm not sure. What I did was copy + paste the pin layout from http://arduino.cc/en/Hacking/PinMapping2560 and ran it through a formatting routine. I then trimmed the Vcc and Gnd pins from the output.
On the Mega aren't the last 16:
I'm not sure. What I did was copy + paste the pin layout from http://arduino.cc/en/Hacking/PinMapping2560 and ran it through a formatting routine. I then trimmed the Vcc and Gnd pins from the output.