Preset Modes
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The following table shows required timings. The Video Electronics Standards Association (VESA) 1,600 × 1,200 at 75 hertz (Hz) mode is the prime mode.

Mode 640 × 480
60 Hz		 VESA
640 × 480
85 Hz		 MS-DOS
720 × 400
70 Hz		 VESA
800 × 600
60 Hz		 VESA
800 × 600
85 Hz		 VESA
1,024 × 768
60 Hz		 VESA
1,024 × 768
85 Hz		 VESA
1,280 × 1,024
85 Hz		 VESA
1,600 × 1,200
75 Hz		 Units
Pixel Timing 39.7 27.8 35.28 25 17.8 15.4 10.6 6.3 4.9 nSec
Horizontal Visible 640 640 720 800 800 1,024 1,024 1,280 1,600 Dots
Horizontal Total 800 832 900 1,056 1,048 1,344 1,376 1,728 2,160 Dots
Horizontal Front Porch 16 56 18 40 32 24 48 64 64 Dots
Horizontal Sync 96 56 108 128 64 136 96 160 192 Dots
Horizontal Back Porch 40 80 54 88 152 160 208 224 304 Dots
Vertical Visible 480 480 400 600 600 768 768 1,024 1,200 Lines
Vertical Total 525 509 449 628 631 806 808 1,072 1,250 Lines
Vertical Front Porch 2 1 12 1 1 3 1 1 1 Lines
Vertical Sync 2 3 2 4 3 6 3 3 3 Lines
Vertical Back Porch 25 25 35 23 27 29 36 44 46 Lines
Horizontal Frequency 31.469 43.269 31.47 37.879 53.764 48.363 68.677 91.146 93.75 kHz
Vertical Frequency 59.940 85.008 70 60.317 85.061 60.004 84.997 85.024 75.000 Hz
Vertical Sync Polarity – – + + + – + + + TTL
Horizontal Sync Polarity – – – + + – + + + TTL