Product specifications

ManualsBrandsVIA Technologies ManualsComputer equipmentVT82C694X Pro

VT8601A Apollo PLE133

Revision 1.82 October 22, 2001 -28- Register Summary Tables

Technologies, Inc.

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Standard VGA Registers

Port

Index VGA Re

isters Default Acc

3B4/5 0-18 CRT Controller (Mono Mode) — RW

3BA — Input Status 1 (Mono Mode) — R

3C0/1 0-14 Attribute Controller — RW

3C2 — Input Status 0 —

3C2 — Miscellaneous Output (Write) —

3C3 — Video Subsystem Enable — RW

3C4/5 0-4 Sequencer — RW

3C6 — RAMDAC Pixel Mask — RW

3C7 — RAMDAC Read Index —

3C8 — RAMDAC Write Index —

3C8 — RAMDAC Index Readback —

3C9 0-FF RAMDAC Palette Data — RW

3CC — Miscellaneous Output (Read) —

3CE/F 0-8 Graphics Controller — RW

3D4/5 0-18 CRT Controller (Color Mode) — RW

3DA — Input Status 1 (Color Mode) —

46E8 — Display Adapter Enable — RW

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 Re

s Default Acc

3C0 — Index — RW

3C0/1 0-F Color Palette — RW

3C0/1 10 Attribute Mode Control — RW

3C0/1 11 Overscan Color — RW

3C0/1 12 Color Plane Enable — RW

3C0/1 13 Horizontal Pixel Panning — RW

3C0/1 14 Color Select — RW

Standard VGA Registers – Sequencer (SR)

Port

Index Se

uencer Re

isters Default Acc

3C4 — Index — RW

3C5 0 Reset — RW

3C5 1 Clocking Mode — RW

3C5 2 Map Mask — RW

3C5 3 Character Map Select — RW

3C5 4 Memory Mode — RW

Standard VGA Registers – Graphics Controller (GR)

Port

Index Gra

hics Controller Re

s Default Acc

3CE — Index — RW

3CF 0 Set / Reset — RW

3CF 1 Enable Set / Reset — RW

3CF 2 Color Compare — RW

3CF 3 Data Rotate — RW

3CF 4 Read Map Select — RW

3CF 5 Graphics Mode 00 RW

3CF 6 Miscellaneous — RW

3CF 7 Color Don’t Care — RW

3CF 8 Bit Mask — RW

Standard VGA Registers – CRT Controller (CR)

Port

Index CRT Controller Re

isters Default Acc

3x4 — Index — RW

3x5 0 Horizontal Total 00 RW

3x5 1 Horizontal Display Ena End 00 RW

3x5 2 Horizontal Blanking Start 00 RW

3x5 3 Horizontal Blanking End 00 RW

3x5 4 Horizontal Retrace Start

3x5 5 Horizontal Retrace End 00 RW

3x5 6 Vertical Total 00 RW

3x5 7 Overflow 00 RW

3x5 8 Preset Row Scan 00 RW

3x5 9 Maximum Scan Line 00 RW

3x5 A Cursor Start 00 RW

3x5 B Cursor End 00 RW

3x5 C Start Address High 00 RW

3x5 D Start Address Low 00 RW

3x5 E Cursor Location High 00 RW

3x5 F Cursor Location Low 00 RW

3x5 10 Vertical Retrace Start 00 RW

3x5 11 Vertical Retrace End 00 RW

3x5 12 Vertical Display Enable End 00 RW

3x5 13 Offset 00 RW

3x5 14 Underline Location 00 RW

3x5 15 Vertical Blanking Start 00 RW

3x5 16 Vertical Blanking End 00 RW

3x5 17 CRTC Mode Control 00 RW

3x5 18 Line Compare 00 RW

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.