Computer terminal

The DEC VT100, a widely emulated computer terminal
IBM 2741, a widely emulated computer terminal in the 1960s and 1970s

A computer terminal is an electronic or electromechanical hardware device that can be used for entering data into, and transcribing[1] data from, a computer or a computing system.[2] The teletype was an example of an early-day hard-copy terminal[3] and predated the use of a computer screen by decades.

Early terminals were inexpensive devices but very slow compared to punched cards or paper tape for input, yet as the technology improved and video displays were introduced, terminals pushed these older forms of interaction from the industry. A related development was time-sharing systems, which evolved in parallel and made up for any inefficiencies in the user's typing ability with the ability to support multiple users on the same machine, each at their own terminal or terminals.

The function of a terminal is typically confined to transcription and input of data; a device with significant local, programmable data-processing capability may be called a "smart terminal" or fat client. A terminal that depends on the host computer for its processing power is called a "dumb terminal"[4] or a thin client.[5][6] A personal computer can run terminal emulator software that replicates functions of a real-world terminal, sometimes allowing concurrent use of local programs and access to a distant terminal host system, either over a direct serial connection or over a network using, e.g., SSH.

  1. ^ E.g., displaying, printing, punching.
  2. ^ similar to a paraphrase of an Oxford English Dictionary definition. "What is the etymology of "[computer] terminal"?". Based on OED, B.2.d. (terminal), the paraphrase says that a terminal is a device for feeding data into a computer or receiving its output, especially one that can be used by a person for two-way communication with a computer.
  3. ^ "The Teletype Story" (PDF).
  4. ^ "What is dumb terminal? definition and meaning". Archived from the original on August 13, 2020. Retrieved March 13, 2019.
  5. ^ Thin clients came later than dumb terminals
  6. ^ the term "thin client" was coined in 1993) Waters, Richard (June 2, 2009). "Is this, finally, the thin client from Oracle?". Archived from the original on December 10, 2022.

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