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3.8.1. Pattern layout table settings
The pattern layout table is a map of the screen (per screen image). Every byte
location of the screen contains color codes for two dots. This is bitmap graphics mode,
and there's no pattern generator table.
0
0
0, 0
1
0, 1
...
...
191
0, 191
...
...
211
0, 211
↑
Y
MSB
7
0
Color code for (0, 0)
1
Color code for (2, 0)
255
Color code for (510, 0)
256
Color code for (0, 1)
54270
Color code for (508, 211)
54271
Color code for (510, 211)
Pattern layout table base address is stored in register R#2, and corresponds to the
cell (0, 0) in the picture above.
MSB
R#2
© 1985 ASCII CORP. / NIPPON GAKKI CO.
1
2
1, 0
2, 0
1, 1
2, 1
...
...
...
...
1, 191
2, 191
...
...
...
...
1, 211
2, 211
6
5
4
7
6
5
0
A16
1
Columns
3
3, 0
...
3, 1
...
...
...
...
X, Y
...
...
...
...
...
...
...
...
3
2
1
Color code for (1, 0)
Color code for (3, 0)
Color code for (511, 0)
Color code for (1, 1)
Color code for (509, 211)
Color code for (511, 211)
4
3
2
1
1
1
Page 56 of 108
511
510, 0
511, 0
...
511, 1
...
...
...
...
...
511,191 LN=0
...
...
...
...
...
511,211 LN=1
0
LSB
Base address
1
0
LSB
1
1
Pattern layout
table base
address
© 2010-2015 Eugeny Brychkov
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