Intel 815 Manuel D’Utilisation
Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
R
140
9.6.40. CR81
Reserved
I/O (and Memory Offset) Address: 3B5h/3D5h(index 81h)
Default: 00h
Attributes Read/Write
Default: 00h
Attributes Read/Write
This register is not present in 2D.
7
0
Reserved (00000000)
Bit Description
7:0
Reserved. (This register did something useful in ‘554, and was not completely removed from Portola
database, even though it does nothing useful).
database, even though it does nothing useful).
9.6.41. CR82
Blink Rate Control
I/O (and Memory Offset) Address: 3B5h/3D5h(index 82h)
Default: 00h
Default:
Default: 00h
Default:
83h is the VGA default, but 88h is used instead because
that’s a more visually
appealing value
Attributes Read/Write
The h/w default for this register does not match the VGA compatibility requirements. BIOS must make
sure to set this register to correct value.
sure to set this register to correct value.
7 6
5
0
Character Blink Duty
Cycle
VSync Blink Rate
Bit Description
7:6
Character Blink Duty Cycle. (Character Blink is also known as Attribute Blink).
00 = 50% duty cycle.
01 = 25% duty cycle.
10 = 50% duty cycle (power on default).
5:0
VSync Blink Rate. Controls the cursor blink rate in terms of the number of VSyncs on the following
basis: the programmed value must be the (actual value/2)-1. (The default is 3).
basis: the programmed value must be the (actual value/2)-1. (The default is 3).