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Preliminary Draft May 19th 1992

Video Subsystem
Preliminary Draft May 19th 1992

2
Preliminary Draft May 19th 1992

Video Subsystem
Section 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 1-1
Video Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Section 2. VGA Function . . . . . . . . . . . . . . . . . . . . . . 2-1
VGA Function Introduction . . . . . . . . . . . . . . . . . . . . . 2-5
Major Components . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Hardware Considerations . . . . . . . . . . . . . . . . . . . . . 2-11
Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Video Memory Organization . . . . . . . . . . . . . . . . . . . . 2-24
Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41
VGA Programming Considerations . . . . . . . . . . . . . . . . 2-97
Video Digital-to-Analog Converter . . . . . . . . . . . . . . . 2-104
VGA Video Extensions . . . . . . . . . . . . . . . . . . . . . . 2-107

Section 3. XGA Function . . . . . . . . . . . . . . . . . . . . . . 3-1
XGA Function Introduction . . . . . . . . . . . . . . . . . . . . . 3-7
VGA compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
132-Column Text Mode . . . . . . . . . . . . . . . . . . . . . . . 3-16
Extended Graphics Mode . . . . . . . . . . . . . . . . . . . . . . 3-20
XGA Display Controller Registers . . . . . . . . . . . . . . . . . 3-34
Coprocessor Description . . . . . . . . . . . . . . . . . . . . . . 3-90
Coprocessor Registers . . . . . . . . . . . . . . . . . . . . . . 3-132
XGA System Interface . . . . . . . . . . . . . . . . . . . . . . . 3-169
Virtual Memory Description . . . . . . . . . . . . . . . . . . . 3-177
| XGA Adapter Identification, Location and XGA Mode Setting 3-192
| VGA Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-223
| Programming the XGA subsystem . . . . . . . . . . . . . . . 3-230

Section 4. Display Connector . . . . . . . . . . . . . . . . . . . 4-1
Display Connector Introduction . . . . . . . . . . . . . . . . . . 4-2

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-1