Transparent
High-order word
of
sprite data line
Low-order word
of
sprite data line
Forms a binary
code,
used
as
the color choice
from
a group
of
color registers.
Figure
4-5:
Sprite Color Definition
The
Os
and
Is
in
the two
data
words
that
define each line of a sprite in the
data
struc-
ture form a binary number. This binary number points
to
one of the four color registers
assigned
to
that
particular sprite DMA channel.
The
eight sprites use system color
registers
16
- 31. For purposes of color selection, the eight sprites are organized into
pairs and each pair uses four of the color registers as shown
in
figure 4-6. Note
that
the
color value of the first register
in
each group of four registers
is
ignored by sprites.
When the sprite bits select this register, the
"transparent"
value is used.
Sprite Hardware
97
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