It gets worse. We want to know the visible area. On NTSC, the vertical blanking interval is approximately 22 lines per field. My reading of the FCC standard is that that should remain the same for color relative to the line frequency. So 262 becomes 240p, and 202 becomes 180p. Technically, it could get even worse. Vertical overscan is a thing; the Apple ][ places only 192 lines under computer control. But let’s stick with 180 horizontal lines. Here’s a size comparison on the vertical axis, ignore the horizontal.
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。zoom是该领域的重要参考
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