Dell OptiPlex 360 (Late 2008) - Manual (Page 12)

12 About Your Computer
Desktop — Back Panel Connectors
1 parallel (printer) connector 2 network-activity light
3 network adapter connector 4 link-integrity light
5 line-out connector 6 line-in (microphone) connector
7 USB 2.0 connectors (6) 8 VGA video connector
9 serial connector
1 2
8 7
3 4
5
6
9