F65510

Manufacturer Part NumberF65510
DescriptionControllers, Flat Panel VGA Controller
ManufacturerIntel Corporation
F65510 datasheet
 
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FP HORIZONTAL COMPENSATION
REGISTER (XR55)
Read/Write at I/O Address 3B7h/3D7h
Index 55h
D7 D6 D5 D4 D3 D2 D1 D0
Ena H Compensation
Ena H Auto Centering
Reserved
Reserved
Ena Auto H Doubling
Reformatter Control
Reserved
This register is used only when flat panel compen-
sation is enabled (XR51 bit-6 = 1).
0
Enable Horizontal Compensation
(EHCP)
0 Disable horizontal compensation
1 Enable horizontal compensation
1
Enable Automatic Horizontal Centering
(EAHC) (effective only if bit-0 is 1)
0 Enable non-automatic horizontal cen-
tering.
The Horizontal Centering
Register is used to specify the left
border. If no centering is desired then
the Horizontal Centering Register can
be programmed to 0.
1 Enable
automatic
centering. Horizontal left and right
borders will be computed automati-
cally.
2
Reserved (Must be programmed to 1)
When operating in 9-dot text modes,
horizontal compensation must always be
enabled (XR51 bit-6=1, XR55 bit-0=1).
3
Reserved
4
Reserved
5
Enable Automatic Horizontal Doubling
(EAHD) (this bit is effective if bit-0 is 1)
0 Disable Automatic Horizontal Dou-
bling. Horizontal doubling will only
be performed for flat panels when
SR01 bit-3 = 1 in any emulation
mode or when 3B8/3D8 bit-0 &
3B8/3D8 bit-4 = 0 in CGA emulation.
1 Enable Automatic Horizontal Dou-
bling. Horizontal doubling will be
performed for flat panels when SR01
bit-3 = 1 in any emulation mode or
Revision 0.7
6
Text Reformatter Control
This bit is typically set to 0. It is used for
test purposes only.
7
Reserved
horizontal
95
Extension Registers
when 3B8/3D8 bit-0 & 3B8/3D8 bit-
4 = 0 in CGA emulation or when the
Horizontal Display width (CR01) is
equal to or less than half of the
Horizontal Panel Size (XR18).
Preliminary 65510

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