## Presentation Device Driver Reference for OS/2

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### Allowing the User to Select OS/2 Display Driver Characteristics

The user needs to specify whether the display driver to be installed will be used as the primary display adapter or as the secondary display adapter.

The user must then specify the type of display driver to install. This is important because many types of display adapter hardware can support a number of different display drivers. For instance, extended graphics array

XGA display adapter hardware can be operated using either the high- resolution XGA display driver or other lower resolution standard display drivers such as video graphics array (VGA) or enhanced graphics adapter ( EGA) display drivers.

Finally, because some display drivers can support operation at more than one graphics resolution, the user might have to specify the display resolution at which the driver is to be operated. Display resolutions are typically specified by supplying the width and height of the display (in pels) and the maximum number of colors that can be simultaneously displayed . The user's choices for display resolution are often affected by the type of video hardware attached to the user's system. For example, both the size and type of the user's display and the amount of video RAM on the display adapter can affect which display resolutions can be run.