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Computer Technology: Peripherals
Input/Output & Storage Devices Peripherals - is the generic name for all input/output equipment and secondary storage devices that depend on direct connections or telecommunications links to the central processing unit of a computer system. Thus, all peripherals are online devices, that is, separate from, but can be electronically connected to and controlled by, a CPU. This is the opposite of offline devices, which are separate from and not under the control of the CPU. Input/Output Hardware Trends Trend: Toward the increased use of direct input/output devices to provide a more natural user interface. Direct input/output devices drastically reduce the need for paper source documents and their conversion to machine-readable media. Input: More and more data and instructions are entered into a computer system directly through input devices such as keyboards, electronic mice, pens, touch screens, optical scanning wands, etc. The most common user interface method for input is the keyboard. Output: Direct output of information through video displays of text and graphics and voice response devices is increasingly becoming the dominant form of output for end users. The most common user interface method for output is the video display screen. Computer Terminal Trends: Computer terminals of various types are widely used for input and output. Computer Terminals - a device that allows remote input to and output from a computer. Visual Display Terminal (VDT) - a terminal that uses a keyboard for input and a TV like screen for visual output, or Cathode Ray Tube (CRT) terminal. Dumb Terminals - have no processing capabilities. They can only perform input and output. There is now a trend away from them towards intelligent terminals. Intelligent Terminals - have their own microprocessors and memory circuits. Transaction Terminals - capture data from end users during a transaction and transmit it over telecommunications networks to a computer system for processing. Examples: ATM, retail point-of-sale (POS) terminals.
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