Point - Yamaha V9938 Programmer's Manual

4.4.12. POINT

POINT command is used to read the color of the specified dot located in VRAM of
expansion RAM. The units used are dots.
POINT execution order
Step 1: Set necessary coordinates in command registers
MSB
R#32
R#33
R#34
R#35
Step 2: Select destination memory
MSB
R#45
Step 3: Execute the command
MSB
R#46
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Video or expansion RAM
(SX, SY)
7 6 5
SX7 SX6 SX5
0 0 0
SY7 SY6 SY5
0 0 0
7 6 5
0 - -
7 6 5
0 1 0
4 3 2
SX4 SX3 SX2
0 0 0
SY4 SY3 SY2
0 0 0
4 3 2
- MXS -
4 3 2
0 - -
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1 0 LSB
SX1 SX0 SX: Source
0 SX8 point X
SY1 SY0 SY: Source
point Y
SY9 SY8
1 0 LSB
- -
0: VRAM Destination
1: ExpRAM location select
1 0 LSB
- - POINT cmd
© 2010-2015 Eugeny Brychkov
ARG