F65510

Manufacturer Part NumberF65510
DescriptionControllers, Flat Panel VGA Controller
ManufacturerIntel Corporation
F65510 datasheet
 
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Page 89/154:

VIRTUAL EGA SWITCH REGISTER

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OFFSET REGISTER (XR1E)
Read/Write at I/O Address 3B7h/3D7h
Index 1Eh
D7 D6 D5 D4 D3 D2 D1 D0
Display Buffer
Width
7-0
Offset Value
See CR13 for description
Programmed Value = Actual Value – 1
Revision 0.7
VIRTUAL EGA SWITCH REGISTER (XR1F)
Read/Write at I/O Address 3B7h/3D7h
Index 1Fh
D7 D6 D5 D4 D3 D2 D1 D0
3-0
Virtual Switch Register
If bit-7 is '1', then one of these four bits is
read back in Input Status Register 0 (3C2h)
bit 4. The selected bit is determined by
Miscellaneous Output Register (3C2h) bits
3-2 as follows:
Misc 3-2
00
01
10
11
6-4
Reserved (0)
7
Sense Bit
This bit always reads back as 0.
85
Extension Registers
Virtual EGA Switches
Reserved
Sense Bit
XR1F Bit Selected
bit-3
bit-2
bit-1
bit-0
Preliminary 65510