Refer to the block diagram and the schematics
in
Chapter
4,
while reading the following material.
Video Signal Processing
The
RGBI
inputs are all TTL level, digital signals sup-
plied
by the computer. These signals are listed
in
Table
3-1.
PIN
NO.
1
2
3
4
5
6
7
8
9
Table
3-1
Input Signals
MODE
1
Ground.
Ground.
A.
G.
B.
Intensity.
Monochrome
Video*
Horizontal Sync.
Vertical Sync.
MODE 2
Ground.
R'.
A.
G.
B.
G'.
B'.
Horizontal Sync.
Vertical Sync.
NOTE: Secondary red (R'), green (G'), and blue (B') signals are
indicated
by
the lower case
r,
g, and b throughout this manual.
* Present,
but
not used
by
this monitor.
The
monitor determines the mode of operation by de-
coding the vertical sync Signal. A positive polarity di-
rects
the monitor into mode 1 and a negative polarity
directs the monitor into mode
2.
The RGB (red, green,
and
blue) signals contain the primary color information.
In
mode
1,
the intensity bit is used to enhance the
hue
of a particular color by providing additional drive
to
the
displayed color.
In
this manner, as many as
16
different colors can be displayed.
Chapter 3
Circuit
Descriptions
In
mode
2,
additional color information is contained
in
the secondary colors r,g,and
b.
These bits of data
are
used in a similar manner as the intensity bit
in
mode
1.
They are used to enhance the hue of a pri-
mary color by providing additional drive to the color
Signal.
64 color combinations are available using 6
input bits. The 16 colors and the input signal combina-
tions required to generate those colors for both modes
are
listed
in
Table 3-2.
Table 3-2
Displayed Colors
MODE
1
MODE
2
Color
RGBI
RrGgBb
Black
0000
000000
Gray
0001
000010
Blue
0010
00
10 00
Light blue
0011
001010
Green
0100
100000
Light green
0101
100010
Cyan
0110
100100
Light cyan
01
1 1
101010
Red
1000
01
01 01
Light red
1001
01
01
11
Magenta
1010
01
11
01
Light magenta 1
01
1
01
11 11
Yellow
1100
11
01 01
Light yellow
1 1
01
11
01
11
White
1 1 1 0
11 11
01
Intensified white
1 1 1 1
111111
0=
No signal.
1 = Signal active.
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