Lenovo ThinkPad 390X User's Reference for ThinkPad 390 - Page 82
Display Modes, Important, The DOS Screen Image on the LCD, Screen Expansion, External, Display
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Attaching an External Monitor Important Do not disconnect the external monitor while the computer is in suspend mode or hibernation mode. If no external monitor is attached when the computer resumes, the LCD remains blank and output is not displayed. This restriction does not depend on the resolution value. The DOS Screen Image on the LCD If you use a DOS application that supports only VGA mode (640x480 resolution) with your computer, the screen image might appear smaller than the display size, as shown: This is to maintain compatibility with DOS applications. To expand the screen image to the same size as the actual screen, you can use the screen expansion function. You can expand the screen image by clicking on the LCD button ( ) in the ThinkPad Configuration program and enabling the radio button for Screen Expansion and clicking on OK. However, the image might look slightly distorted. Display Modes The ThinkPad 390 computer has an LCD that supports an XGA (1024x768 resolution) video mode or an SVGA (800x600 resolution) video mode. The following table shows the various display modes (resolution and color depth) available with your computer or external monitor. Use this table to set the display output (LCD, External Display or LCD+External Display). Note: When installing an operating system, you must install the display driver supplied with the computer to use SVGA mode. 66 ThinkPad 390 User's Reference