JG82852GMSL7VP Datasheet, PDF (52/176 Pages) Intel Corporation – Intel® 852GM/852GMV Chipset Intel® 852GM/852GMV Chipset Hub (GMCH)

Register Description
R
3.7. VGA I/O Mapped Registers
If Device 2 is enabled, and Function 0 within device 2 is enabled for VGA, and IO_EN is set within
Function 0 then GMCH claims a set of I/O registers for legacy VGA function. Table 14 lists direct CPU
access registers and Table 15 lists registers that are index – data registers that are used to access internal
VGA register.
Table 14. VGA I/O Mapped Register List
Name
Function
Read @
Write @
ST00
ST01
FCR
MSR
VGA Input Status Register 0
VGA Input Status Register 1
VGA Feature Control Register
VGA Miscellaneous Output Register
3C2h
3BAh/3Dah
3CAh
3CCh
3BAh/3DAh
3C2h
Table 15. Index – Data Registers
Name
Function
SRX
GRX
ARX
Sequencer Registers
Graphics Controller Registers
Attribute Control Registers
DACMASK
DACSTATE
DACRX
DACWX
DACDATA
CRX
Pixel Data Mask Register
DAC State Register
Palette Read Index Register
Palette Write Index Register
Palette Data Register
CRT Registers
Index IO
3C4
3CE
3C0
--
--
3C7 Write Only
3C8 Write Only
3C9
3B4/3D4
(MDA/CGA)
Data IO
3C5
3CF
3C0: Write
3C1: Read
3C6h
3C7 Read Only
--
3B5/3D5
(MDA/CGA)
52
Intel^® 852GM/852GMV Chipset GMCH Datasheet