Pset - Yamaha V9938 Programmer's Manual

4.4.11. PSET

PSET command is used to draw a dot in VRAM of expansion RAM. Programmer can
select logical operation on the existing color of the dot in the specified location. The units
used are dots.
PSET execution order
Step 1: Set necessary coordinates in command registers
MSB
R#36
R#37
R#38
R#39
Step 2: Set color register value
Color of the dot should be coded in color register R#44 (CLR). Format of color data
depends on the graphics mode. It is possible to do logical operation on the existing and
new color of the defined dot through coding the code of logical operation in the CMR.
MSB
R#44
© 1985 ASCII CORP. / NIPPON GAKKI CO.
Video or expansion RAM
(DX, DY)
7 6 5
DX7 DX6 DX5
0 0 0
DY7 DY6 DY5
0 0 0
7 6 5
- - -
- - -
C7 C6 C5
4 3 2
DX4 DX3 DX2
0 0 0
DY4 DY3 DY2
0 0 0
4 3 2
- C3 C2
- - -
C4 C3 C2
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1 0 LSB
DX1 DX0 DX: Target
point X
0 DX8
DY1 DY0 DY: Target
point Y
DY9 DY8
1 0 LSB
C1 C0 G4, G6
C1 C0 G5
C1 C0 G7
© 2010-2015 Eugeny Brychkov