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Figure 19. Model 911 Video Display Terminal
The 911 VOT provides the following features:
• High-resolution display screen
• Instant data display
• Uppercase and lowercase ninety-six-character set
(keyboard is full ASCII)
• 1920-character display (twenty-four lines by eighty
characters)
• Separated keyboard (cable-connected)
• Standard ten-key numeric pad
Note:
990
CRU Chassis
Section
911 VDT
Keyboard Assembly
Optional extension cables are available
in lengths up to 610 metres (2000 feet).
• Special-function bit that accompanies each
character in memory to specify high or low
display intensity or, as a software flag, to indicate
a protected field
• Programmable-function keys.
The basic VOT kit, shown in figure 20, consists of
a display unit, keyboard assembly, controller circuit
board, and connecting cables.
The 911 VOT features a 305-millimetre (l2-inch)
diagonal, high-resolution screen, housed in a light-
gray console. Oriving circuitry for the display unit
consists of all solid-state components mounted on a
circuit board next to the tube. Natural convection
cooling without a fan ensures the quiet operation
necessary for an office environment.
Bright, easily readable, Gothic-font, uppercase and
lowercase alphabetic, numeric, and special (+, -,
*,
etc.) symbols are formed as 5 x 7 dot-matrix
characters. Optional graphic symbols use the entire
7 x 10 character space. The screen capacity is either
twelve horizontal lines of eight characters per line
(960 characters) or twenty-four horizontal lines of
eighty characters per line (1920 characters). A
special-function bit accompanying each character in
memory specifies high or low display intensity or, as
a software flag, indicates a protected display field.
Cursor blinking is implemented through software
selection.
Identical Controller/Display Interfaces
I
Alarm Enable
From Controller
Modem Audio
Video Data
{
Keyboard Data
To Controller
Terminal Status
5-m (16.4-ft.)
Interconnection Cable
\+---~--
911 Video Display Unit
Figure 20. Basic VDT Kit
48
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