Acer TravelMate 4100 - Manual (Page 52)

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Universal Serial Bus (USB)
The USB 2.0 port is a high-speed serial bus which allows you to connect USB
peripherals without taking up precious system resources.
IEEE 1394 port
The computer's IEEE 1394 port allows you to connect to an IEEE 1394-
compatible device like a video camera or digital camera.
See your video or digital camera's documentation for details.