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Video Modes 183
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 40 and Table 41 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 40: Standard VGA Modes
Mode
in Hex
Bits /
Pixel
Colors
(#/ Palette
Size) Resolution
Pixel
Freq.
(MHz)
Horiz.
Freq.
(kHz)
Vert.
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
Table 41: Extended VGA Modes
Mode
in Hex
Bits /
Pixel
Colors
(#/ Palette
Size)
Resolution
Pixel
Freq.
(MHz)
Horiz.
Freq.
(kHz)
Vert.
Freq.
(Hz)
Memory
58, 6A 8 16/256K 800 X 600 36 35.2 56 1MB
58, 6A 8 16/256K 800 X 600 40 37.8 60 1MB
58, 6A 8 16/256K 800 X 600 50 48.1 72 1MB
58, 6A 8 16/256K 800 X 600 49.5 46.9 75 1MB
5C 8 256/256K 800 X 600 36 35.2 56 1MB
5C 8 256/256K 800 X 600 40 37.9 60 1MB
5C 8 256/256K 800 X 600 50 48.1 72 1MB
5C 8 256/256K 800 X 600 49.5 46.9 75 1MB
5C 8 256/256K 800 X 600 56.25 53.7 85 1MB
3424.boo Page 183 Wednesday, September 2, 1998 9:23 AM