如果从计算机传递过来的信号和下面的当前计时模一样,那麽屏幕就会自动地调整。然而, 如果信号是不同的,那麽屏幕就可能会变成空白,而电源发光二极管是亮着的。参照视频卡 的手册并按如下步骤调整屏幕。
表 1. 当前计时模
显示模式 | 水平频率 | 垂直频率 | 图像时钟 | 同步极性 | ||
(kHz) | (Hz) | (MHz) | (H/V) | |||
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MAC, 640 x | 480 | 35,000 | 66,667 | 30,240 | ||
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MAC, 832 x | 624 | 49,726 | 74,551 | 57,284 | ||
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IBM, 640 x | 350 | 31,469 | 70,086 | 25,175 | +/- | |
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IBM, 640 x | 480 | 31,469 | 59,940 | 25,175 | ||
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IBM, 720 x | 400 | 31,469 | 70,087 | 28,322 | ||
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VESA, 640 x 480 | 37,500 | 75,000 | 31,500 | |||
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VESA, 640 x 480 | 37,861 | 72,809 | 31,500 | |||
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VESA, 800 x 600 | 35,156 | 56,250 | 36,000 | |||
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VESA, 800 x 600 | 37,879 | 60,317 | 40,000 | +/+ | ||
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VESA, 800 x 600 | 46,875 | 75,000 | 49,500 | +/+ | ||
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VESA, 800 x 600 | 48,077 | 72,188 | 50,000 | +/+ | ||
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VESA, 1024 | x 768 | 48,363 | 60,004 | 65,000 | ||
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VESA, 1024 | x 768 | 56,476 | 70,069 | 75,000 | ||
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VESA, 1024 | x 768 | 60,023 | 75,029 | 78,750 | +/+ | |
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VESA, 1280 | x 1024 | 63,981 | 60,020 | 108,00 | +/+ | |
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VESA, 1280 | x 1024 | 79,976 | 75,025 | 135,00 | +/+ | |
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SUN, 1280 x 1024 | 81,129 | 76,106 | 135,00 | |||
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水平频率
沿水平方向从屏幕的右边到左边扫描一条线所需的时间叫做水平周 期,水平周期的倒数叫做水平频率。单位:kHz
垂直频率
像一盏荧光灯那样,屏幕必须在每秒钟内把同样的图像重复很多 次,才能向用户显示出一个图像来。这种重复的频率叫做垂直频 率,或者叫做翻新率。单位:Hz