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Video Modes A-3
VGA EXTENDED MODES
The C&T 65548 VGA BIOS supports standard VESA and extended modes, listed in the
following table.
Table A-5 VGA Extended Modes (Text Mode)
Hex
Mode
No. of
Colors
Text
Display
Font
Size
Pixel
Resolution
Dot Clock
MHz
Horiz.
Freq.
KHz
Vert.
Freq.
Hz
60 16 132 x 25 8 x 16 1056 x 400 40.0 30.5 68
61 16 132 x 50 8 x 16 1056 x 400 40.0 30.5 68
Table A-6 VGA Extended Modes (4-Bit Linear Mode)
Hex
Mode
No. of
Colors
Text
Display
Font
Size
Pixel Reso-
lution
Dot
Clock
MHz
Horiz.
Freq.
KHz
Vert.
Freq.
Hz
20 16 80 x 30 8 x 16 640 x 480 25.175 31.5 60
22 16 100 x 37 8 x 16 800 x 600 40.0 37.5 60
24 16 128 x 48 8 x 16 1024 x 768 65.0 48.5 60
24I 44.9 35.5 43
Table A-7 VGA Extended Modes (8-Bit Linear Mode)
Hex
Mode
No. of
Colors
Text
Display
Font
Size
Pixel Reso-
lution
Dot
Clock
MHz
Horiz.
Freq.
KHz
Vert.
Freq.
Hz
30 256 80 x 30 8 x 16 640 x 480 25.175 31.5 60
32 256 100 x 37 8 x 16 800 x 600 40.0 37.5 60
34* 256 128 x 48 8 x 16 1024 x 768 65.0 48.5 60
34I* 44.9 35.5 43
Table A-8 VGA Extended Modes (15-Bit Linear Mode)
Hex
Mode
No. of
Colors
Text
Display
Font
Size
Pixel Reso-
lution
Dot
Clock
MHz
Horiz.
Freq.
KHz
Vert.
Freq.
Hz
40* 32K 80 x 30 8 x 16 640 x 480 50.350 31.5 60
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