Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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3.4.Indirect VGA and Extended VGA Register Indices

Programming an index value into the appropriate SRX, GRX, ARX, or CRX register indirectly accesses the registers listed in this section. The index and data register address locations are listed in the previous section. Additional details concerning the indirect access mechanism are provided in the VGA and Extended VGA Registers Chapter (see SRxx, GRxx, ARxx or CRxx sections).

Table 4.

2D Sequence Registers (3C4h / 3C5h)

 

Index

Sym

Description

 

 

 

 

 

00h

SR00

Sequencer Reset

 

 

 

 

 

01h

SR01

Clocking Mode

 

 

 

 

 

02h

SR02

Plane / Map Mask

 

 

 

 

 

03h

SR03

Character Font

 

 

 

 

 

04h

SR04

Memory Mode

 

 

 

 

 

07h

SR07

Horizontal Character Counter Reset

 

 

 

 

Table 5.

2D Graphics Controller Registers (3CEh / 3CFh)

 

Index

Sym

Register Name

 

 

 

 

 

00h

GR00

Set / Reset

 

 

 

 

 

01h

GR01

Enable Set / Reset

 

 

 

 

 

02h

GR02

Color Compare

 

 

 

 

 

03h

GR03

Data Rotate

 

 

 

 

 

04h

GR04

Read Plane Select

 

 

 

 

 

05h

GR05

Graphics Mode

 

 

 

 

 

06h

GR06

Miscellaneous

 

 

 

 

 

07h

GR07

Color Don’t Care

 

 

 

 

 

08h

GR08

Bit Mask

 

 

 

 

 

10h

GR10

Address Mapping

 

 

 

 

 

11h

GR11

Page Selector

 

 

 

 

 

14:1Fh

GR[14:1F]

Software Flags

 

 

 

 

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Intel 815 manual Indirect VGA and Extended VGA Register Indices, Index Sym Description, Index Sym Register Name