Video and Sync
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The following table shows required timings. The Video Electronics Standards Association (VESA) 1,600 × 1,200 at 85 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 × 1024
@ 85 Hz		 VESA
1,600 × 1,200
@ 85 Hz		 Units
Pixel Timing 39.7 27.8 35.28 25 17.8 15.385 10.6 6.3 4.4 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 Synchronous 96 56 108 128 64 136 96 160 192 Dots
Horizontal Back Porch 48 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 10 1 13 1 1 3 1 1 1 Lines
Vertical Sync 2 3 2 4 3 6 3 3 3 Lines
Vertical Back Porch 33 25 34 23 27 29 36 44 46 Lines
Horizontal Frequency 31.469 43.269 31.47 37.879 53.674 48.363 68.677 91.146 106.250 kHz
Vertical Frequency 59.940 85.008 70 60.317 85.061 60.0 84.997 85.024 85.000 Hz
Vertical Sync Polarity – – + + + – + + + TTL
Horizontal Sync Polarity – – – + + – + + + TTL