Color Graphics Display - NCR PC4I Technical Reference

THE SCREEN DISPLAY
Scan lines O to 7 are passed to the controller
without intervening conversion. The scan line number
specified for the cursor start must not be greater
than that specified for the end scan line.
COLOR GRAPHICS DISPLAY
The graphics display card supports display of the
256-characters - set in an 80 (horizontal) x 25
format. All points addressable graphics can be
implemented in three degrees of resolution. This card
is capable of driving a color CRT. The color CRT of
the NCR PERSONAL COMPUTER MODEL 4E has the following
hardware characteristics:
• Screen dimensions
• Digital input signals
• Display
• Definition
*
Bandwidth
• Refresh rate
• Horizontal frequency
• Anti-glare surface
12 inches (295 mm)
Red, Green, Blue, Intensity
8
colors, each in normal and
high intensity: black, red,
green, blue, brown, magenta,
cyan, white
640 (horizontal)
x
400
20 MHz
55.6 Hz
23.6 KHz
Figures 7.12 and 7.13 illustrate the signal flow
which results in the generation of the color display.
Figure 7,14 illustrates connections to the
color CRT deflection board.