kat ferraz

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kat ferraz

  1. 1. Computer system hardware Input Process Output Storage
  2. 2. Input devices <ul><li>An input device is any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system (such as a computer). Input and output devIces make up the hardware interface between a computer as a scanner or GDOF controller. </li></ul><ul><li>Note that direct input is almost necessarily absolute, but indirect input may be either absolute or relative. For example, digitizing graphic tablets that do not have an embedded screen involve indirect input, and sense absolute positions and are often run in an absolute input mode, but they may also be setup to simulate a relative input mode where the stylus or puck can be lifted and repositioned. </li></ul><ul><li>one example here is keyboarding . ( what is keyboarding ) </li></ul><ul><li>and pointing devices like mouse. </li></ul>
  3. 3. keyboarding
  4. 4. In computing, a keyboard is an input device, partially modeled after the typewriter keyboard, which uses an arrangement of buttons or keys, to act as mechanical levers or electronic switches. A keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. However, to produce some symbols requires pressing and holding several keys simultaneously or in sequence. While most keyboard keys produce letters, numbers or signs (characters), other keys or simultaneous key presses can produce actions or computer commands. normal usage, the keyboard is used to type text and numbers into a word processor, text editor or other program. In a modern computer, the interpretation of keypresses is generally left to the software. A computer keyboard distinguishes each physical key from every other and reports all keypresses to the controlling software. Keyboards are also used for computer gaming, either with regular keyboards or by using keyboards with special gaming features, which can expedite frequently used keystroke combinations. A keyboard is also used to give commands to the operating system of a computer, such as Windows' Control-Alt-Delete combination, which brings up a task window or shuts down the machine.
  5. 5. Pointing devices <ul><li>In computing, a mouse (plural mouses, mice, or mouse devices) is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. The name mouse, originated at the Stanford Research Institute, derives from the resemblance of early models (which had a cord attached to the rear part of the device, suggesting the idea of a tail) to the common mouse. </li></ul>
  6. 6. process <ul><li>In computing, a process is an instance of a computer program, consisting of one or more threads, that is being sequentially executed computer system that has the ability to run several computer programs concurrently. </li></ul>
  7. 7. Output devices <ul><li>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 as a computer) to the outside world. </li></ul><ul><li>In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer), and the outside world. Inputs are the signals or data sent to the system, and outputs are the signals or data sent by the system to the outside. </li></ul><ul><li>The most common input devices used by the computer are the keyboard and mouse. The keyboard allows the entry of textual information while the mouse allows the selection of a point on the screen by moving a screen cursor to the point and pressing a mouse button. The most common outputs are monitors and speakers. </li></ul>
  8. 8. Storage <ul><li>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 as a computer) to the outside world. </li></ul><ul><li>In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer), and the outside world. Inputs are the signals or data sent to the system, and outputs are the signals or data sent by the system to the output, </li></ul><ul><li>One of examples of these computer storages are the SDRAM an example for primary storage, the SDLT or tape cartridge, an example of off-line storage. When used within a robotic tape library, it is classified as tertiary storage instead and the HDD or as known as the hard disk drive. </li></ul>
  9. 9. SDRAM, SDLT and HDD

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