## Display Device Driver Reference for OS/2

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### Selecting OS/2 Display-Driver Characteristics

The user must specify whether the display driver being installed will be used for a primary or secondary display adapter. The user must then specify the type of display driver to install, 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 a high-resolution XGA display driver or a lower- resolution standard display driver such as Video Graphics Array (VGA) or Enhanced Graphics Adapter (EGA).

Some display drivers can support more than one graphics resolution, so the user might have to specify the display resolution at which the driver is to be operated. Typically, display resolutions are specified by supplying the width and height of the display (in pels) and the maximum number of colors that can be displayed simultaneously.

The user's choices for display resolution often are governed 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 affect which display resolutions will run.