A 50-pin board-to-board connector connects the main board and the logic board of the PLAY:5. A partial pinout is below. DAC refers to the Cirrus Logic CS44800 on the Main Board. The pin numbers refer to the number silk screened on the respective PCB. Note that the Main Board and Logic Board have their pin numbers mirrored with respect to each other (i.e. pin 1 on the main board goes to pin 2 on the logic board).