Yamaha V9938 Programmer's Manual page 51

3.7.1. 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 four 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 (4, 0)
127 Color code
for (508, 0)
128 Color code
for (0, 1)
27135 Color code
for (508, 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
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1 2
1, 0 2, 0
1, 1 2, 1
... ...
... ...
1, 191 2, 191
... ...
... ...
1, 211 2, 211
6 5 4
Color code
for (1, 0)
Color code
for (5, 0)
Color code
for (509, 0)
Color code
for (1, 1)
Color code
for (509, 211)
7 6 5
0 A16 A15
Columns
3
3, 0 ...
3, 1 ...
... ...
... X, Y
... ...
... ...
... ...
... ...
3 2 1
Color code Color code
for (2, 0) for (3, 0)
Color code Color code
for (6, 0) for (7, 0)
Color code Color code
for (510, 0) for (511, 0)
Color code Color code
for (2, 1) for (3, 1)
Color code Color code
for (510, 211) for (511, 211)
4 3 2
1 1 1
Page 51 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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