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APPENDIX
Mode Dot Clock Frequencies A: Front Porch B: Sync Period
HVHVHV
µs/Dot ms/Line µs/Dot ms/Line
VGA
640 x 480 25.175 MHz 31.468 kHz 59.941 Hz 0.636 / 16 0.318 / 10 3.813 / 96 0.054 / 2
VGA
720 x 400 28.322 MHz 31.468 kHz 70.087 Hz 0.636 / 18 0.381 / 12 3.813 / 108 0.064 / 2
VESA
640 x 480 31.5 MHz 37.86 kHz 72.81 Hz 0.508 / 16 0.026 / 1 1.270 / 40 0.079 / 3
VESA
640 x 480 31.5 MHz 37.50 kHz 75.00 Hz 0.508 / 16 0.027 / 1 2.032 / 64 0.080 / 3
VESA
640 x 480 36.0 MHz 43.27 kHz 85.01 Hz 1.556 / 56 0.023 / 1 1.556 / 56 0.069 / 3
VESA
800 x 600 36.0 MHz 35.16 kHz 56.25 Hz 0.667 / 24 0.028 / 1 2.000 / 72 0.057 / 2
VESA
800 x 600 40.0 MHz 37.88 kHz 60.32 Hz 1.000 / 40 0.026 / 1 3.200 / 128 0.106 / 4
VESA
800 x 600 50.0 MHz 48.08 kHz 72.19 Hz 1.120 / 56 0.770 / 37 2.400 / 120 0.125 / 6
VESA
800 x 600 49.5 MHz 46.88 kHz 75.00 Hz 0.323 / 16 0.021 / 1 1.616 / 80 0.064 / 3
VESA
1024 x768 65.0 MHz 48.36 kHz 60.00 Hz 0.369 / 24 0.062 / 3 2.092 / 136 0.124 / 6
VESA
1024 x768 75.0 MHz 56.48 kHz 70.07 Hz 0.320 / 24 0.053 / 3 1.813 / 136 0.106 / 6
VESA
1024 x768 78.75 MHz 60.02 kHz 75.03 Hz 0.203 / 16 0.017 / 1 1.219 / 96 0.050 / 3
Macintosh
640 x 480 30.24 MHz 35.00 kHz 66.67 Hz 2.116 / 64 0.086 / 3 2.116 / 64 0.086 / 3
Macintosh
832 x 624 57.28 MHz 49.73 kHz 74.55 Hz 0.559 / 32 0.020 / 1 1.117 / 64 0.060 / 3