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Key Points- Hardware (2) (Output Devices (Plotters- for CAD and…
Key Points- Hardware (2)
Output Devices
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Large printing formats- for printing signs, banners and posters
Printers- Laser, ink-jet and dot-matrix - for black and colour printing
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Monitors- Traditional CRT, TFT (flat panel, monitors and laptop screens) LCD (calculators) and digital projectors
Control devices- switches, relays, valves, actuators, motors, alarms, heaters, lights and lamps- for computerised control of machines
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Storage
Devices for storing data (permanent non-volatile storage) include- hard disk, CD (compact disc, DVD, USB memory stick, magnetic tape
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The three types of storage devices are- Optical, Magnetic, Solid State
Process
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The CPU carries out software instructions, performs arithmetic operations on the data and passes data to and from the memory
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Memory
ROM (read only memory) is a chip inside the computer that stores program instructions, normally to start (boot) the computer
RAM (random access memory) is formed from one or more chips inside the computer (typically 1 or 2 GB in a microcomputer)
Volatile memory means it will lose its content when the power is switched off- RAM is a volatile memory, ROM is a non-volatile memory