## Display Device Driver Reference for OS/2

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### Operating Modes

The 8514/A graphics adapter operates in the following modes:

Video-graphics array (VGA)

This is the power-on mode; the functionality of the 16-bit VGA display driver is available.

Advanced-function

This mode provides a programming interface for the adapter. The primary advantage of the 8514/A display driver over the 16-bit VGA display driver is that the advanced-mode adapter interface handles much of the hardware programming for you. Instead of programming directly into the bit-plane memory, the adapter provides an interface supporting most of the required display functions.

Both modes of operation are selectable under program control.