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USB
Universal Serial Bus is designed to allow many different peripherals to be connected to a computer, these include joysticks, USB memory keys, printers, external hard drives, mouse, keyboards, PDAs, didgital cameras and game pads.

USB supports three data rates from a low speed of (1.1, 2.0) rate of 1.5 Mbit/s up to a high speed (2.0) rate of 480 Mbit/s (60 MB/s).
Upper Memory
The area of memory between 640K and 1MB.
UPS

UPS or also known as Uninterruptible Power Supply is a device attached to computer equipment that protects it from damage caused by overvoltage and undervoltage such as spikes and brownouts.



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