HP Compaq Presario,Presario 5056 Technical Information Page 122

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Hardware and Software Guide 9–1
9
USB and 1394 Devices
What Is USB?
USB (Universal Serial Bus) is a hardware interface that can be
used to connect an external device such as a USB keyboard,
mouse, drive, printer, scanner, or hub to the notebook or an
optional docking device.
A hub is a connecting device that can be either powered or
unpowered. USB hubs can be connected to a USB port on the
notebook or to other USB hubs. Hubs support varying numbers of
USB devices and are used to increase the number of USB devices
in the system.
Powered hubs must be connected to external power.
Unpowered hubs must be connected either to a USB port on the
notebook or to a port on a powered hub.
A USB device may require support software, which is usually
included along with installation instructions, with the device.
The 4 USB ports on the notebook support USB 2.0-compliant,
USB 1.1-compliant, and USB 1.0-compliant devices.
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