Command Registers - Yamaha V9938 Programmer's Manual

2.1.6. Command registers

The following command registers are used when executing a command on the MSX-
VIDEO. Details on the use of these command registers will be presented in later chapter.
MSB
R#32
R#33
R#34
R#35
MSB
R#36
R#37
R#38
R#39
MSB
R#40
R#41
R#42
R#43
MSB
R#44
R#45
R#46
© 1985 ASCII CORP. / NIPPON GAKKI CO.
7 6 5
SX7 SX6 SX5
0 0 0
SY7 SY6 SY5
0 0 0
7 6 5
DX7 DX6 DX5
0 0 0
DY7 DY6 DY5
0 0 0
7 6 5
NX7 NX6 NX5
0 0 0
NY7 NY6 NY5
0 0 0
7 6 5
CH3 CH2 CH1
0 MXC MXD MXS
CM3 CM2 CM1 CM0
4 3 2
SX4 SX3 SX2
0 0 0
SY4 SY3 SY2
0 0 0
4 3 2
DX4 DX3 DX2 DX1
0 0 0
DY4 DY3 DY2 DY1
0 0 0 DY9
4 3 2
NX4 NX3 NX2 NX1
0 0 0
NY4 NY3 NY2 NY1
0 0 0 NY9
4 3 2
CH0 CL3 CL2
DIY DIX
LO3 LO2
Page 22 of 108
1 0 LSB
SX1 SX0 Source X low
register
0 SX8 Source X high
register
SY1 SY0 Source Y low
register
SY9 SY8 Source Y high
register
1 0 LSB
DX0 Destination X
low register
0 DX8 Destination X
high register
DY0 Destination Y
low register
DY8 Destination Y
high register
1 0 LSB
NX0 Number of dots
X low register
0 NX8 Number of dots
X high register
NY0 Number of dots
Y low register
NY8 Number of dots
Y high register
1 0 LSB
CL1 CL0 Color register
EQ MAJ Argument
register
LO1 LO0 Command
register
© 2010-2015 Eugeny Brychkov