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Glossary » I/O Devices


visual display unit; a screen or monitor. Also, VDT, visual display terminal.

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vector display

a technology used for computer monitors that moved the electron beam in a CRT directly along the paths between specified points on the display, creating very sharp, smooth lines and requiring very little memory to refresh the display. Vector displays…

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virtual device

an abstract specification of an input or output device that enables a programmer to interact with that device without knowing the details of the specific device, e.g. by using a printer language to send output to a printer without knowing…

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voice output communication aid

VOCA; a device used by those with speech impairments that uses computer-generated speech to communicate.

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