Cyberspace and Society Lecture 5

An ordinary personal computer that is connected to a

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An ordinary personal computer that is connected to a network A powerful desktop computer used for high-performance tasks Servers, mainframes, and supercomputers o The purpose of a server is to serve computers on a network by supplying them with data o Mainframes Large, powerful, expensive Can support hundreds to thousands of users $300,000 – several million Still used by many large businesses o Supercomputers 2,000 trillion calculations per second Computationally heavy problems Scientific and large scale applications in medicine, aerospace, weather forecasting, nuclear energy
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Computer functions o Basic functions of a computer Receive input: accept information from the outside world Process information: arithmetic or logical (decision-making) operations on information Produce output: communicate information to the outside world Store information: store and retrieve information from memory and storage devices Basic input devices o Keyboard o Pointing device Pointing stick Trackpad Trackball Joystick o Touch-sensitive screen Display devices o A CRT display device uses a bulky glass tube o A LCD manipulates light within a layer of liquid crystal cells o Plasma screen technology illuminates lights arranged in a panel-like screen o LED screens are actually LED screens with an LED light source Screen output o Monitor size: measured as a diagonal line across the screen o
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