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The three odd-numbered bitplanes (1, 3, and 5) are grouped together by the
hardware and may be used in playfield 1. Likewise, the three even-numbered
bitplanes (2, 4, and 6) are grouped together and may be used in playfield
2. The bitplanes are assigned alternately to each playfield, as shown in
Figure 3-13.

-------------------------------
In high resolution mode, you can have up to two bitplanes in each
playfield -- bitplanes 1 and 3 in playfield 1 and bitplanes 2 and 4
in playfield 2.

Number of
Bitplanes
"turned on."     Plafield 1 *            Playfield 2 *
------------------------------------------------------
0              none                     none
____________
|            |
1         | 1          |
|            |
|____________|
____________            ____________
|            |          |            |
2         | 1          |          | 2          |
|            |          |            |
|____________|          |____________|
____________            ____________
|            |          |            |
3         | 1 _________|__        | 2          |
|  |            |       |            |
|__| 3          |       |____________|
|            |
|____________|
____________            ____________
|            |          |            |
4         | 1 _________|__        | 2 _________|__
|  |            |       |  |            |
|__| 3          |       |__| 4          |
|            |          |            |
|____________|          |____________|
____________            ____________
|            |          |            |
5         | 1 _________|__        | 2 _________|__
|  |            |       |  |            |
|__| 3 _________|__     |__| 4          |
|  |            |       |            |
|__| 5          |       |____________|
|            |
|____________|
____________            ____________
|            |          |            |
6         | 1 _________|__        | 2 _________|__
|  |            |       |  |            |
|__| 3 _________|__     |__| 4 _________|__
|  |            |       |  |            |
|__| 5          |       |__| 6          |
|            |          |            |
|____________|          |____________|

* Note: Either playfield may be placed "in front of"
or "behind" the other using the "swap-bit."

Figure 3-13: How Bitplanes Are Assigned to Dual Playfields

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