F65510

Manufacturer Part NumberF65510
DescriptionControllers, Flat Panel VGA Controller
ManufacturerIntel Corporation
F65510 datasheet
 


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Page 50/154:

CRTC INDEX REGISTER (CRX)

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CRTC INDEX REGISTER (CRX)

Read/Write at I/O Address 3B4h/3D4h
D7 D6 D5 D4 D3 D2 D1 D0
CRTC Index
Reserved
5-0
CRTC data register index
7-6
Reserved (0)
HORIZONTAL TOTAL REGISTER (CR00)
Read/Write at I/O Address 3B5h/3D5h
Index 00h
Group 0 Protection
D7 D6 D5 D4 D3 D2 D1 D0
Horizontal Total
This register is used for all VGA and EGA modes.
It is also used for 640 column CGA modes and
MDA/Hercules text mode. In all 320 column CGA
modes and Hercules graphics mode, the alternate
register is used.
7-0
Horizontal Total. Total number of character
clocks per line = contents of this register +
5. This register determines the horizontal
sweep rate.
Revision 0.7
CRT Controller Registers
HORIZONTAL DISPLAY ENABLE END
REGISTER (CR01)
Read/Write at I/O Address 3B5h/3D5h
Index 01h
Group 0 Protection
D7 D6 D5 D4 D3 D2 D1 D0
This register is used for all VGA and EGA modes
on CRTs. It is also used for 640 column CGA
modes and MDA/Hercules text mode. In all 320
column CGA modes and Hercules graphics mode,
the alternate register is used.
7-0
Number of Characters displayed per scan
line - 1.
46
Horizontal Display
Preliminary 65510