In dual-playfield mode, each play
field
is
formed from up
to
three bit-planes. Color regis-
ters 0 through 7 are assigned to playfield
1,
depending upon how many bit-planes you
use. Color registers 8 through
15
are assigned to playfield
2.
Bit-Plane
Assignment
in
Dual-playfield
Mode
The three odd-numbered bit-planes (I,
3,
and
5)
are grouped together by the hardware
and may be used
in
playfield 1. Likewise, the three even-numbered bit-planes (2,
4,
and
6)
are grouped together and may
be
used
in
playfield
2.
The bit-planes are assigned
alternately to each playfield, as shown
in
figure 3-13. Note
that
in high-resolution mode,
you can have up
to
two bit-planes
in
each playfield - bit-planes 1 and 3 in playfield 1
and bit-planes 2 and 4
in
playfield
2.
60 Play
field
Hardware
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