53Connecting USB devicesUniversal Serial Bus (USB) is a serial bus design that is capableof cascading peripherals such as a digital camera, keyboard,mouse, joystick, scanner, printer and modem. With USB,complex cable connections can be eliminated.Your computer comes with six external USB ports: two on thefront and another four on the rear panel. These ports supportUSB 2.0 high performance external devices such as webcamsand digital still cameras. They also allow you to connectadditional USB devices to your computer without using up itssystem resources.To connect a USB device, simply plug the device cable into anyof the USB ports (black) located on the front and rearpanels of your computer.Note: The USB devices shown below are for your referenceonly. Actual device models may vary by geographic region.