[1] : WordNet (r) 2.0

visual display unit
     n : british a device for displaying input signals as letters
         on a screen; usually has a keyboard syn: vdu
see also:
vdu 

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

visual display unit
     
         vdu, or "video terminal", "video display
        terminal", vdt, "display terminal" a device incorporating a
        cathode ray tube crt display, a keyboard and a serial
        port.  a vdu usually also includes its own display
        electronics which store the received data and convert it into
        electrical waveforms to drive the crt.
     
        vdus fall into two categories: dumb terminals and
        intelligent terminals sometimes called "programmable
        terminals".
     
        early vdus could only display characters in a single preset
        font, and these were confined to being layed out in a
        rectangular grid, reproducing the functionality of the
        paper-based teletypes they were designed to replace.
     
        later models added graphics facilities but were still driven
        via serial communications, typically with several vdus
        attached to a single multi-user computer.  this contrasts with
        the much faster single bitmap displays integrated into most
        modern single-user personal computers and workstations.
     
        the term "display screen equipment" dse is used almost
        exclusively in connection with the health and safety issues
        concerning vdus.
     
        working with vdus - uk heath and safety executive
        http://www.hse.gov.uk/pubns/indg36.pdf.
     
        2002-11-09
     
     
see also:
cathode ray tube serial port dumb terminals intelligent terminals font teletypes 
bitmap displays personal computers workstations lt;working with vdus - uk heath and safety executivegt; 

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Control Unit, definition of term: Control Unit
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