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A Peripheral device is any external device attached to a computer Without Peripherals a computer is just a box full of wires transistors and circuits which is able to -1Respond to a specific set of instructions in a well-defined manner2Execute a prerecorded list of instructions a program The only problem being that without any input Peripherals you cannot tell the computer to do any of the above processes and if you could without an output device of some kind the computer has no way of delivering the result to the userExamples of peripherals include printers disk drives display monitors keyboards and mice etcThese can be separated into two categories -An input device is any machine that feeds data into a computer For example a keyboard is an input device Input devices other than the keyboard are sometimes called alternate input devices Mice trackballs and light pens are all alternate input devicesAn output device is any machine capable of representing information from a computer This includes display screens printers plotters and synthesizers Developments in Peripherals in the Last Few YearsThere have been many advances in the field of Peripherals over the last few years Even the humble keyboard and mouse have been re-invented to produce the Ergonomic keyboard and the cordless and laser mouse There have also been advances in monitors such as flat screen displays and LCD screensBut there have also been advances in technology which although not new have been made available for home use such as the digital camera scanners digital video camera and the colour printerTo look at some of the advances in detail we should put them into their categoriesPrinters have developed from the daisy wheel printer to the thermal printers of today Other advancement in printers have been the laser printer Same technology as photocopiers which is used commonly in offices as it produces very high quality text and graphics
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