Fujitsu Lifebook E780 User Manual page 23

IEEE 1394 (4-pin) Jack
The 4-pin 1394 jack is used to connect between your notebook and an IEEE 1394 peripheral such as a
digital video camera. See "IEEE 1394 Port" on page 89.
DC Power Jack
The DC power jack allows you to plug in the AC adapter to power your LifeBook notebook and charge
the internal Lithium ion battery.
17 - Getting to Know Your LifeBook