F65510

Manufacturer Part NumberF65510
DescriptionControllers, Flat Panel VGA Controller
ManufacturerIntel Corporation
F65510 datasheet
 
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Page 47/154:

CHARACTER FONT SELECT REGISTER

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CHARACTER FONT SELECT
REGISTER (SR03)
Read/Write at I/O Address 3C5h
Index 03h
Group 1 Protection
D7 D6 D5 D4 D3 D2 D1 D0
Font Select B bit-1
Font Select B bit-2
Font Select A bit-1
Font Select A bit-2
Font Select B bit-0
Font Select A bit-0
Reserved
In text modes, bit-3 of the video data's attribute byte
normally controls the foreground intensity. This bit
may be redefined to control switching between char-
acter sets. This latter function is enabled whenever
there is a difference in the values of the Character
Font Select A and the Character Font Select B bits. If
the two values are the same, the character select
function is disabled and attribute bit-3 controls the
foreground intensity.
SR04 bit-1 must be 1 for the character font select
function to be active. Otherwise, only character
fonts 0 and 4 are available.
1-0
High order bits of Character Generator
Select B
3-2
High order bits of Character Generator
Select A
4
Low order bit of Character Generator
Select B
5
Low order bit of Character Generator
Select A
7-6
Reserved (0)
Revision 0.7
The following table shows the display memory plane
selected by the Character Generator Select A and B
bits.
Code
Character Generator Table Location
0
First 8K of Plane 2
1
Second 8K of Plane 2
2
Third 8K of Plane 2
3
Fourth 8K of Plane 2
4
Fifth 8K of Plane 2
5
Sixth 8K of Plane 2
6
Seventh 8K of Plane 2
7
Eighth 8K of Plane 2
where 'code' is:
Character Generator Select A (bits 3, 2, 5) when
bit-3 of the the attribute byte is one.
Character Generator Select B (bits 1, 0, 4) when bit-
3 of the attribute byte is zero.
43
Sequencer Registers
Preliminary 65510