Mega2650 Pinouts

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i have mega2650 listing of pin connections, , pictorial of board can't figure out several pin connections:

1)  ioref ? - don't see on pinout list

2)  6 pins (double threes) next aref pin?

3) unmarked connector pins connected anything? e.g. unmarked pin next ioref or 2 next aref

thanks,
john

quote
1)  ioref ? - don't see on pinout list


this "new" pin added in r3 series of arduinos 5v let shields know underneath 5v system. presumably other arduino-like devices operate @ 3.3v can set 3.3v, let shields know working on 3.3v system.

quote
2)  6 pins (double threes) next aref pin?


those in-circuit programming (icsp) pins usb microcontroller.

quote
3) unmarked connector pins connected anything? e.g. unmarked pin next ioref or 2 next aref


the unmarked pin next ioref not connected anything. 2 next aref twi (i2c) pins, same sda/scl pins 20 , 21.

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