VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-72
VGA Registers
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
VGA Graphics Controller Registers (GR)
Port 3CE – VGA Graphics Controller Index..................RW
7
Reserved
........................................ always reads 0
6-0
Graphics Controller Index
Only the lower 4 bits are implemented in a standard
VGA to allow access to Graphics Controller registers
0-8. However, 7 bits are implemented here to allow
for extended registers up to index 7F.
Port 3CF Index 0 – Graphics Controller Set / Reset ......RW
7-4
Reserved
........................................ always reads 0
3-0
Set / Reset Planes 3-0
Port 3CF Index 1 – Graphics Controller Set / Reset EnaRW
7-4
Reserved
........................................ always reads 0
3-0
Enable Set / Reset Planes 3-0
Port 3CF Index 2 – Graphics Controller Color CompareRW
7-4
Reserved
........................................ always reads 0
3-0
Color Compare Planes 3-0
Port 3CF Index 3 – Graphics Controller Data Rotate ...RW
7-4
Reserved
........................................ always reads 0
3
Function Select
2-0
Rotate Count
Port 3CF Index 4 – Graphics Ctrlr Read Map Select ....RW
7-2
Reserved
........................................ always reads 0
1-0
Map Select
Port 3CF Index 5 – Graphics Controller Mode ............. RW
7
Reserved
........................................ always reads 0
6
256 Color Mode ........................................ default = 0
5
Shift Register ............................................ default = 0
4
Odd / Even .............................................. default = 0
3
Read Mode .............................................. default = 0
2
Reserved
........................................ always reads 0
1-0
Write Mode .............................................. default = 0
Port 3CF Index 6 – Graphics Controller Miscellaneous RW
7-4
Reserved
........................................ always reads 0
3-2
Memory Map
1
Chain Odd Maps to Even
0
Graphics Mode
Port 3CF Index 7 – Graphics Ctrlr Color Don’t Care .. RW
7-4
Reserved
........................................ always reads 0
3-0
Color Don’t Care Planes 3-0
Port 3CF Index 8 – Graphics Controller Bit Mask........ RW
7-0
Bit Mask
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