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Attaching an External Monitor
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Note the following when the TV is the secondary display or the
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simultaneous display: Because of the television accept ratio
(screen shape), the edge of the image will be cut off even when
you set the smallest resolution.
If you set the CRT as your secondary display and you want to
show DOS full screen, both primary (LCD) and secondary (CRT)
become DOS full screen modes.
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The screen will be blank when you use DOS full screen (VGA
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mode) on television.
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If you play the video clip (AVI or MPEG file), the image is in
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overlay mode on the LCD and TV when you use them
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simultaneously, but only on the LCD when you use the dual
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display function.
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If you play the video clip (AVI or MPEG file) and move the cursor
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on the window, the cursor disappears under the image.
An application using the DirectDraw or the Direct3D is shown
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only on the primary display (LCD) when it is played with full
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screen mode.
You cannot use the Fn+F7 (display switching) function when you
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are in the dual display mode or displaying the image on the
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television simultaneously with the LCD.
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IBM ThinkPad 600E User's Reference