Computer terminal

DEC VT100 terminal transparent

A computer terminal is an electronic or electromechanical hardware device that is used for entering data into, and displaying data from, a computer or a computing system. Terminals are a critical component in the interaction between users and computers, especially in the early days of computing.

History

The development of computer terminals began in the 1960s. Early terminals were often teleprinters or teletypewriters, which were mechanical devices that printed text on paper. These were eventually replaced by video display terminals (VDTs), which used cathode ray tube (CRT) displays to show text on a screen.

Types of Terminals

There are several types of computer terminals, including:

• Dumb terminals: These terminals have no processing power of their own and rely entirely on the connected computer for processing.
• Smart terminals: These terminals have limited processing capabilities and can perform some functions independently of the central computer.
• Graphical terminals: These terminals can display graphics as well as text, and are often used in modern computing environments.

Functionality

Computer terminals serve several key functions:

• Input: Users can input data and commands into the computer system via the terminal.
• Output: The terminal displays data and responses from the computer system.
• Communication: Terminals facilitate communication between the user and the computer system, often through a command-line interface or a graphical user interface.

Modern Usage

While traditional computer terminals are less common today, the concept persists in various forms. Modern equivalents include thin clients, remote desktop software, and virtual terminals, which allow users to interact with remote computing resources.

Related Technologies

• Terminal emulator
• Shell (computing)
• Command-line interface
• Remote desktop software
• Thin client

See Also

• Mainframe computer
• Minicomputer
• Personal computer
• Workstation
• Server (computing)

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