14 Reference Infomation
14-8
14-5 Preset Timing Modes
Sync Polarity
(H/V)
Pixel Clock
(MHz)
Vertical Frequency
(Hz)
Horizontal
Frequency
(kHz)
Display Mode
IBM, 640 x 480 31.469 59.940 26.175 +/-
IBM, 720 x400 31.469 70.087 28.322 -/+
VESA 640 x480 37.5 75 31.5 -/-
VESA 800 x 600 37.879 60.317 40.0 +/+
VESA 800 x 600 46.875 75.0 49.5 +/+
VESA 1024 x 768 48.363 60.004 65.0 -/-
VESA 1024 x 768 60.023 75.029 78.750 +/+
VESA 1280 x 1024 63.981 60.020 108.00 +/+
VESA 1280 x 1024 79.976 75.025 135.0 +/+
SUN 1280 x 1024 81.129 76.106 135.00 -/-
VESA 1680 x 1050 65.300 60.000 146.00 +/+
- If the signal transferred from the computer is the same as the following Preset Timing Modes, the screen
will be adjusted automatically. However, if the signal differs, the screen may go blank while the power LED
is on. Refer to the video card manual and adjust the screen as follows.
Table 1. Preset Timing
Horizontal Frequency
The time to scan one line connecting the right edge to the left edge of the screen horizontally is called
Horizontal Cycle and the inverse number of the Horizontal Cycle is called Horizontal Frequency. Unit: kHz
Vertical Frequency
Like a fluorescent lamp, the screen has to repeat the same image many times per second to display an
image to the user. The frequency of this repetition is called Vertical Frequency or Refresh Rate. Unit: Hz
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