HP Vectra Technical Reference Manual page 38

Graphics Display Memory Organization
320 x 200 Graphics Display Memory
OB800:0H
OB800:2000H
OB800:4000H
OB800:7FFFH
Byte 0
I
Byte 1
I
Byte 2
I
...
I
Byte 79
•
•
•
Byte 0
I
Byte 1
I
Byte 2
I
•••
I
Byte 79
•
•
•
Not Accessible
Scan line
o
2
4
1
3
5
Writing to these addresses
actually writes to addresses
OB800:0H through OB800:3FFFH
Byte I Pixel Organization
7 6 5 4 3 2 1 0 bit number
pixel number
o
0 - 1 of 16 Background Colors
o
1 - Green/Cyan
1 0 - Red/Magenta
1 1 - Brown/Light Grey
Figure 3.2
Video 29