B69000 Asiliant Technologies, B69000 Datasheet - Page 140

• Manufacturer Part Number: B69000
• Manufacturer: Asiliant Technologies

Specifications of B69000

• Lead Free Status / Rohs Status: Supplier Unconfirmed

SR03
read/write at I/O address 3C5h with index at address 3C4h set to 03h
Note: 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 character 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.
7-6
5, 3-2
4, 1-0
Note:
&+,36
7
Reserved
Character Map Select Bits for Character Map A
These three bits are used to select the character map (character generator tables) to be used as
the secondary character set (font). Note that the numbering of the maps is not sequential.
Character Map Select Bits for Character Map B
These three bits are used to select the character map (character generator tables) to be used as
the primary character set (font). Note that the numbering of the maps is not sequential.
Bit 1 of the Memory Mode Register (SR04) must be set to 1 for the character font select function of
this register to be active. Otherwise, only character maps 0 and 4 are available.
Reserved
69000 Databook
Character Map Select Register
3 2
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
1 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
6
Bit
Bit
0 0
Select (bit 0)
Bit 5
Bit 4
Char Map A
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
5
Map Number
Map Number
Subject to Change Without Notice
Select (bit 0)
Char Map B
0
4
1
5
2
6
3
7
0
4
1
5
2
6
3
7
Sequencer Registers
4
Character Map A Select
3rd 8KB of plane 2 at offset 16K
4th 8KB of plane 2 at offset 24K
5th 8KB of plane 2 at offset 32K
6th 8KB of plane 2 at offset 40K
7th 8KB of plane 2 at offset 48K
8th 8KB of plane 2 at offset 56K
3rd 8KB of plane 2 at offset 16K
4th 8KB of plane 2 at offset 24K
5th 8KB of plane 2 at offset 32K
6th 8KB of plane 2 at offset 40K
7th 8KB of plane 2 at offset 48K
8th 8KB of plane 2 at offset 56K
2nd 8KB of plane 2 at offset 8K
2nd 8KB of plane 2 at offset 8K
1st 8KB of plane 2 at offset 0
1st 8KB of plane 2 at offset 0
3
(bits 2 and 1)
Table Location
Table Location
2
Character Map B Select
Revision 1.3 8/31/98
1
(bits 2 and 1)
0
10-5