iv 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
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
Macintosh
1152 x 870 100.0 MHz 68.68 kHz 75.06 Hz 0.320/32 0.044/3 1.280/128 0.044/3
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 37.5 kHz 75.00 Hz 0.508/16 0.027/1 2.032/67 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 x 768 65.0 MHz 48.36 kHz 60.00 Hz 0.369/24 0.062/3 2.092/136 0.124/6
VESA
1024 x 768 75.0 MHz 56.48 kHz 70.07 Hz 0.320/24 0.053/3 1.813/136 0.106/6
VESA
1024 x 768 78.75 MHz 60.02 kHz 75.03 Hz 0.203/16 0.017/1 1.219/96 0.050/3
VESA
1024 x 768 94.5 MHz 68.68 kHz 85.0 Hz 0.508/48 0.015/1 1.016/96 0.044/3
VESA
1280 x 1024 108.0 MHz 63.98 kHz 60.02 Hz 0.444/48 0.016/1 1.037/112 0.047/3
VESA
1280 x 1024 135.0 MHz 79.97 kHz 75.02 Hz 0.119/16 .013/1 1.067/144 0.038/3