INPUT DEVICES An input device is a peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system such as a computer or information appliance. Examples of input devices include keyboard, mouse, scanners, digital cameras and joysticks, etc. An input device is any hardware device that sends data […]
OUTPUT DEVICES: An output device is any piece of computer hardware that is used to output data that has been previously entered into a computer or similar processing device. An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such
ELECTRO-MECHANICAL COUNTING DEVICES Electro-mechanical counting devices are those counting devices that could be operated both electrically and mechanically These includes the following Blaise Pascal Machine Gottfried Leibniz Machine Joseph Jacquard Loom Charles Babbage Analytical Engine BLAISE PASCAL CALCULATING MACHINE: Blaise Pascal was a French man who invented a new kind of computer in 1642. The
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Electronic counting devices are the modern computer. The electronic counting devices are as follows: Herman Hollerith Punch Card John Von Neumann Machine Modern Computer. HERMAN HOLLERITH PUNCH CARD In 1881, Herman Hollerith began designing a machine to tabulate census data more efficiently than traditional hand method. Herman Hollerith invented and used a punched card device
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OUTPUT DEVICES: There are the physical components of a computer used to obtain results from computer after processing. There devices convert data from machine-readable format into human-readable format. Examples: (a) Monitor (b) Printer (c) Plotter (d) Speaker (e) Projector (f) Microfilm, etc. (a) MONITOR: This is an output device that displays the result of processing
 KEYS ON KEYBOARD A keyboard is an input device that resemble a typewriter, which is used to type text, numbers, symbols, commands and to give instructions to the computer. Alphanumeric keys: These are used to type letters and numbers, the letters A – Z, a – z and the digital 0 – 9. Punctuation Keys: