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What is the difference between USB port , parallel port and serial port.?

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What is the difference between USB port , parallel port and serial port.?

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USB is a serial (universal serial bus) its been around for over 4 years in one for or another but the standard itself as in USB its self is 15 years old parallel is used mainly for printers but sum other hardware like your IDE hard drive users a parrallel ribbon cable to transfer data, the difference between the 2 is serial has to que up packets of data which can make it slower the serial but always more compact. parralel can send more bits only each of it wires with no need for those bits to be translted at the other end like serial. you see USB has to translate the bits and put them in order when it recieves them making it also slower but with the invention of firewire and USB 3 they have overtaken the bulkier parallel cables.

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