computer terminal

computer terminal a device that enables a computer to receive or deliver data. Computer terminals vary greatly depending on the format of the data they handle. For example, a simple early terminal comprised a typewriter keyboard for input and a typewriter printing element for alphanumeric output. A more recent variation includes the keyboard for input and a televisionlike screen to display the output. The screen can be a cathode-ray tube or a gas plasma panel, the latter involving an ionized gas (sandwiched between glass layers) that glows to form dots which, in turn, connect to form lines. Such displays can present a variety of output, ranging from simple alphanumerics to complex graphic images used as design tools by architects and engineers. Portable terminals frequently use liquid crystal displays because of their low power requirements. The terminals of pen-based computers use a stylus to input handwriting on the screen. Touch-sensitive terminals accept input made by touching a pressure-sensitive panel in front of a menu displayed on the screen. Other familiar types of terminals include store checkout systems that deliver detailed printed receipts and use laser scanners to read the bar codes on packages, and automatic teller machines in banks.

Bibliography: See L. Tijerina, Video Display Terminal Workstation Ergonomics (1984).

terminal A computer input and output device. It commonly consists of a keyboard and display screen, connected to the computer. Terminals that are distant from the computer and connected to it by a communications link are called remote terminals. Terminals with some computing power, often incorporating a microprocessor, are called intelligent terminals. Specialized terminals have been developed for use in banking and retailing.

terminal A device consisting of a keyboard and a monitor that allows the user to contact and send data and messages to another computer on a network. A rather dated term which is rapidly going out of use.