F65510 Character Font Select Register - 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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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
Revision 0.7
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
3-2
7-6
4
5
High order bits of Character Generator
Select B
High order bits of Character Generator
Select A
Low order bit of Character Generator
Select B
Low order bit of Character Generator
Select A
Reserved (0)
®
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
43
The following table shows the display memory plane
selected by the Character Generator Select A and B
bits.
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.
Code
0
1
2
3
4
5
6
7
Character Generator Table Location
First 8K of Plane 2
Second 8K of Plane 2
Third 8K of Plane 2
Fourth 8K of Plane 2
Fifth 8K of Plane 2
Sixth 8K of Plane 2
Seventh 8K of Plane 2
Eighth 8K of Plane 2
Sequencer Registers
Preliminary 65510

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