Is something like this what you're looking for?
page 58 of: http://homepage.mac.com/micahgartman/web/sahnapiranha/dev/dn_duo_system.pdf
page 58 of: http://homepage.mac.com/micahgartman/web/sahnapiranha/dev/dn_duo_system.pdf
It also has a list of all the pins and their functions