Computer Output Device: Dot-matrix Printer

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Computer Output Device: Dot-matrix Printer www.assignmentpoint.com

Dot-matrix printer How it works: This has a print head that travels across the paper. The head has a set of pins which are pushed out to form the shape of each character The pins hit an ink ribbon against the paper as the print head moves along. An animation showing how head of a 21 pin dot-matrix printer moves across the paper, firing the pins that strike the ink against the paper. www.assignmentpoint.com

Disadvantages: The printing quality is low - these printers produce low to medium quality black and white printing and can only print low resolution graphics. Because of the impact of the pins against the paper, these printers can be quite noisy. www.assignmentpoint.com

Advantages: The purchase cost is low and the running costs are very low. They can print fairly quickly, particularly if you remember that multiple copies are being printed in one print run. They are robust and can operate in harsh environments. If several sheets of self-carbonating paper are placed into the printer then the impact will produce multiple copies. www.assignmentpoint.com