Dell Dimension XPS T___ - Manual (Page 48)

System Board Connectors and Sockets
1 Voltage selection switch
2 Security cable ring
3 Parallel port connector
4 MIDI/game port connector*
5 Video connector
6 Microphone jack*
7 Line-in jack*
8 Line-out jack*
9 Diagnostic code indicators (4)
10 Serial port connector
11 USB connectors (2)
12 Keyboard connector
13 Mouse connector
14 AC power receptacle
* Present only on systems with integrated sound.