VT8601 Via, VT8601 Datasheet - Page 34

• Manufacturer Part Number: VT8601
• Description: Slot-1 / Socket-370 PCI North Bridge
• Manufacturer: Via

Standard VGA Registers
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)
Standard VGA Registers – Sequencer (SR)
Revision 1.3 September 8, 1999
3CE/F
3D4/5 0-18 CRT Controller (Color Mode)
3B4/5
3C0/1
3C4/5
3C0/1
3C0/1
3C0/1
3C0/1
3C0/1
3C0/1
46E8
3DA
Port
3BA
3CC
Port
Port
3C2
3C2
3C3
3C6
3C7
3C8
3C8
3C9
3C0
3C4
3C5
3C5
3C5
3C5
3C5
7HFKQRORJLHV ,QF
Index VGA Registers
Index Attribute Controller Regs
Index Sequencer Registers
0-18 CRT Controller (Mono Mode)
0-14 Attribute Controller
0-FF RAMDAC Palette Data
:H &
:H &R R QQHFW
0-F Color Palette
0-4 Sequencer
0-8 Graphics Controller
—
—
—
—
—
—
—
—
—
—
—
—
10
11
12
13
14
—
0
1
2
3
4
QQHFW
Display Adapter Enable
Input Status 1 (Mono Mode)
Input Status 0
Miscellaneous Output (Write)
Video Subsystem Enable
RAMDAC Pixel Mask
RAMDAC Read Index
RAMDAC Write Index
RAMDAC Index Readback
Miscellaneous Output (Read)
Input Status 1 (Color Mode)
Index
Attribute Mode Control
Overscan Color
Color Plane Enable
Horizontal Pixel Panning
Color Select
Index
Reset
Clocking Mode
Map Mask
Character Map Select
Memory Mode
Default Acc
Default Acc
Default Acc
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
W
W
W
R
R
R
R
R
-28-
Standard VGA Registers – Graphics Controller (GR)
Standard VGA Registers – CRT Controller (CR)
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.
Port
Port
3CE
3CF
3CF
3CF
3CF
3CF
3CF
3CF
3CF
3CF
3x4
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
3x5
Index Graphics Controller Regs
Index CRT Controller Registers
10
11
12
13
14
15
16
17
18
—
—
A
B
C
D
E
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
9
F
Index
Read Map Select
Graphics Mode
Miscellaneous
Index
Horizontal Total
Horizontal Display Enable
Horizontal Blanking Start
Horizontal Blanking End
Horizontal Retrace End
Overflow
Preset Row Scan
Maximum Scan Line
Cursor Start
Cursor End
Start Address High
Start Address Low
Cursor Location High
Cursor Location Low
Vertical Retrace Start
Vertical Retrace End
Vertical Display Enable End
Offset
Underline Location
Vertical Blanking Start
Vertical Blanking End
Line Compare
Set / Reset
Enable Set / Reset
Color Compare
Data Rotate
Color Don’t Care
Bit Mask
Horizontal Retrace Start
Vertical Total
CRTC Mode Control
VT8601 Apollo ProMedia
Register Summary Tables
Default Acc
Default Acc
FF
—
—
—
—
—
—
00
—
—
—
—
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW