Yamaha V9938 Programmer's Manual page 24

MSB
S#3
S#4
S#5
S#6
The above registers S#3...S#6 contain coordinate information about collision location
of the sprites, or location of light pen, or relative movement of the mouse.
MSB
S#7
This color register is used when executing commands "POINT" and "VRAM to CPU"
and contains VRAM data.
MSB
S#8
S#9
When the search command is executed and coded color had been detected (see R#2),
this register contains its X coordinate.
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7 6 5
X7 X6 X5
1 1 1
Y7 Y6 Y5
1 1 1
7 6 5
C7 C6 C5
7 6 5
BX7 BX6 BX5
1 1 1
4 3 2
X4 X3 X2
1 1 1
Y4 Y3 Y2
1 1 1
4 3 2
C4 C3 C2
4 3 2
BX4 BX3 BX2
1 1 1
Page 24 of 108
1 0 LSB
X1 X0 Column register
low
1 X8 Column register
high
Y1 Y0 Row register
low
Y9 Y8 Row register
high
1 0 LSB
C1 C0 Color register
1 0 LSB
BX1 BX0 Coded color X
register low
1 BX8 Coded color X
register high
© 2010-2015 Eugeny Brychkov