VT8601 datasheet(34/144 Pages) ETC1

34 / 144 page

VT8601 Apollo ProMedia

Revision 1.3 September 8, 1999

-28-

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Standard VGA Registers

Port

Index VGA Registers

Default

Acc

3B4/5

0-18 CRT Controller (Mono Mode)

—RW

3BA

—

Input Status 1 (Mono Mode)

—R

3C0/1

0-14 Attribute Controller

—

3C2

—

Input Status 0

—

3C2

—

Miscellaneous Output (Write)

—

3C3

—

Video Subsystem Enable

—

3C4/5

0-4

Sequencer

—

3C6

—

RAMDAC Pixel Mask

—

3C7

—

RAMDAC Read Index

—

3C8

—

RAMDAC Write Index

—

3C8

—

RAMDAC Index Readback

—

3C9

0-FF RAMDAC Palette Data

—

3CC

—

Miscellaneous Output (Read)

—

3CE/F

0-8

Graphics Controller

—

3D4/5

0-18 CRT Controller (Color Mode)

—RW

3DA

—

Input Status 1 (Color Mode)

—

46E8

—

Display Adapter Enable

—

Note: CRTC registers are accessible at either 3B4 / 3B5 or

3D4 / 3D5 (shorthand notation 3x4 / 3x5) depending on the

setting of the color / mono bit.

Standard VGA Registers – Attribute Controller (AR)

Port

Index Attribute Controller Regs

Default

Acc

3C0

—

Index

—

3C0/1

0-F

Color Palette

—

3C0/1

Attribute Mode Control

—

3C0/1

Overscan Color

—

3C0/1

Color Plane Enable

—

3C0/1

Horizontal Pixel Panning

—RW

3C0/1

Color Select

—

Standard VGA Registers – Sequencer (SR)

Port

Index Sequencer Registers

Default

Acc

3C4

—

Index

—

3C5

Reset

—

3C5

Clocking Mode

—

3C5

Map Mask

—

3C5

Character Map Select

—

3C5

Memory Mode

—

Standard VGA Registers – Graphics Controller (GR)

Port

Index Graphics Controller Regs

Default

Acc

3CE

—

Index

—

3CF

Set / Reset

—

3CF

Enable Set / Reset

—

3CF

Color Compare

—

3CF

Data Rotate

—

3CF

Read Map Select

—

3CF

Graphics Mode

3CF

Miscellaneous

—

3CF

Color Don’t Care

—

3CF

Bit Mask

—

Standard VGA Registers – CRT Controller (CR)

Port

Index CRT Controller Registers

Default

Acc

3x4

—

Index

—

3x5

Horizontal Total

3x5

Horizontal Display Enable

3x5

Horizontal Blanking Start

3x5

Horizontal Blanking End

3x5

Horizontal Retrace Start

3x5

Horizontal Retrace End

3x5

Vertical Total

3x5

Overflow

3x5

Preset Row Scan

3x5

Maximum Scan Line

3x5

Cursor Start

3x5

Cursor End

3x5

Start Address High00

3x5

Start Address Low

3x5

Cursor Location High00

3x5

Cursor Location Low

3x5

Vertical Retrace Start

3x5

Vertical Retrace End

3x5

Vertical Display Enable End

3x5

Offset

3x5

Underline Location

3x5

Vertical Blanking Start

3x5

Vertical Blanking End

3x5

CRTC Mode Control

3x5

Line Compare

Note: CRTC registers are accessible at either 3B4 / 3B5 or

3D4 / 3D5 (shorthand notation 3x4 / 3x5) depending on the

setting of the color / mono bit.

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