Dell Latitude C540 - Manual (Page 14)

NOTICE: To avoid damaging the computer, wait 5 seconds after turning off the computer before you
disconnect an external device.
CAUTION: Do not block, push objects into, or allow dust to accumulate in the air vents.
Doing so can damage the computer or cause a fire.
1 serial connector 6 video connector
2 parallel connector 7 AC adapter connector
3 docking connector 8 fan
4 PS/2 connector 9 fan
5 USB connector
Serial Connector
Connects serial devices, such as a mouse or handheld device.
Parallel Connector
Connects a parallel device, such as a printer. You can also connect the optional floppy
drive directly to the parallel connector using the optional floppy drive cable.