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Table-11 Relationship between CG-RAM address, Character Codes (DD-RAM) AND 5*8 (whit Cursor)
Dot Character Patterns (CG-RAM)
Character Codes
(DD-RAM DATA)
CG-RAM ADDRESS
Character Patterns
(CG-RAM data)
D
D
D
D
D
D
D
D
A
A
A
A
A
A
D
D
D
7
6
5
4
3
2
1
0
5
4
3
2
1
0
7
6
5
D
4
D
3
D
2
D
1
D
0
0 0 0
1 2 3 4 5
0 0 1
6 7 8 9 10
Character
0 1 0
11 12 13 14 15
Pattern(0)
0 1 1 0 0
16 17 18 19 20
1 0 0
21 22 23 24 25
1 0 1
26 27 28 29 30
1 1 0
31 32 33 34 35
0 0 0 0
0 0 0
1 1 1
36
Cursor
0 0 0
1 2 3 4 5
0 0 1
6 7 8 9 10
0 1 0
11 12 13 14 15
Character
0 1 1 0 0 1 0 0 1
16 17 18 19 20
Pattern (1)
1 0 0
21 22 23 24 25
1 0 1
26 27 28 29 30
1 1 0
31 32 33 34 35
0 0 0 0
1 1 1
36
Cursor
0 0 0
1 2 3 4 5
0 0 1
6 7 8 9 10
Character
1 1 1 1 1 1
Pattern(7)
0 0 0 0
Cursor
Notes: 1. Character code bits 0 to2 correspond to CG-RAM address bits 3 to 5 (3 bits 8 types).
2. CG-RAM address bits 0 to 2 desig
nate the character the patter line position. The 8th
line is the cursor
position and its display is formed by a logical OR with the cursor. Maintain the 8th
line If bit 4of the 8
th
line data is 1.1 bit will light up the cursor regardless of the cursor presence
3. Character pattern row positions correspond to CG-RAM data bits 0 to 4 (bit 4 being at the left )
4. As show Table-11 CG-RAM character patterns are selected when character code bits 4 to 7 are all 0.
However, since character code bit 3 has no effect , the
d
isplay example above can be selected by
either character code 00H or 08H
5. 1 for CG-ram data corresponds display selection and 0 to non-selection.”
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