System I/O Addresses/Memory Map/PCI Configuration and Device
Map/Interrupts/Video Mode Assignments A-7
Video Modes
The CL-GD5480 integrated video controller provides all standard IBM VGA
modes. With 2 MB of SGRAM standard, the system supports special Cirrus
Logic extended modes. Table A-6and Table A-7 list the standard and extended
modes that this implementation supports, including the number of colors and
palette size (e.g., 16 colors out of 256 K colors), resolution, pixel frequency, and
scan frequencies.
Table A-6. Standard VGA Modes
Mode(s)
in Hex
Bits per
pixel
Colors (no per
palette size)
Resolution
Pixel
Freq. (MHz)
Horizontal
Freq. (kHz)
Vertical Freq.
(Hz)
0, 1
4
16/256K
360 X 400
14
31.5
70
2, 3
4
16/256K
720 X 400
28
31.5
70
4, 5
4
4/256K
320 X 200
12.5
31.5
70
6
4
2/256K
640 X 200
25
31.5
70
7
4
Mono
720 X 400
28
31.5
70
D
4
16/256K
320 X 200
12.5
31.5
70
E
4
16/256K
640 X 200
25
31.5
70
F
4
Mono
640 X 350
25
31.5
70
10
4
16/256K
640 X 350
25
31.5
70
11
4
2/256K
640 X 480
25
31.5
60
12
4
16/256K
640 X 480
25
31.5
60
12+
4
16/256K
640 X 480
31.5
37.5
75
13
8
256/256K
320 X 200
12.5
31.5
70
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