F65510 Crtc Index Register (crx) - Intel Corporation

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F65510

Manufacturer Part Number
F65510
Description
Controllers, Flat Panel VGA Controller
Manufacturer
Intel Corporation
Datasheet
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HORIZONTAL TOTAL REGISTER (CR00)
Read/Write at I/O Address 3B5h/3D5h
Index 00h
Group 0 Protection

CRTC INDEX REGISTER (CRX)

Read/Write at I/O Address 3B4h/3D4h
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
Revision 0.7
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.
5-0
7-6
7-0
Horizontal Total. Total number of character
clocks per line = contents of this register +
5. This register determines the horizontal
sweep rate.
CRTC data register index
Reserved (0)
®
Horizontal Total
CRTC Index
Reserved
46
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.
CRT Controller Registers
Horizontal Display
Preliminary 65510

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