Commodore PC 20 - Video Data Format

L
C
c
c
132 x 25 Monochrome Text
One page of text is provided in this mode. Its address is:
bOOOO - b Ifff
132 x 44 Monochrome Text
One page of text is provided in this mode. Its address is:
bOOOO - b3fff
0.6.2 Video Data Format
In this selection, only the video data format for the Plantronics
graphics mode,
and the 640 X 200 16 colors mode are discussed.
Plantronics 320 x 20016 Colors
In this mode, 2 bits from each plane are combined to form a pixel
with 16 color combinations.
b7
b6 b5 b4
b3 b2 b1 bO
Plane 0 c1
cO c1 cO
c1 cO c1
cO
Plane 1
c3 c2
c3
c2
c3 c2 c3 c2
1st 2nd
3rd 4th
pel pel
pel pel
c2 c1
cO c3
Color
I R
G B
0 0 0
0 black
0 0 0 1
blue
0 0 1 0
green
0
0
1 1
cyan
0
1 0 0
red
0 1
0 1
magenta
0
1 1
0
brown
0
1 1 1
white
1
0
0
0
gray
1
0
0
1 light blue
1 0 1
0
I ight green
1 0 1
1
light cyan
1 1 0
0 light red
1 1 0 1
light magenta
1 1 1 0 yellow
1 1 1
1 white (hiqh
intensity)
Using AT! 4'