Figure 4.15 Map size
●Normal scroll screen
┌───────┬───────┐
│ │ │
│Plane A│Plane B│
│ │ │
├───────┼───────┤
│ │ │
│Plane C│Plane D│
│ │ │
└───────┴───────┘
●Rotating scroll screen
┌───────┬───────┬───────┬───────┐
│ │ │ │ │
│Plane A│Plane B│Plane C│Plane D│
│ │ │ │ │
├───────┼───────┼───────┼───────┤
│ │ │ │ │
│Plane E│Plane F│Plane G│Plane H│
│ │ │ │ │
├───────┼───────┼───────┼───────┤
│ │ │ │ │
│Plane I│Plane J│Plane K│Plane L│
│ │ │ │ │
├───────┼───────┼───────┼───────┤
│ │ │ │ │
│Plane M│Plane N│Plane O│Plane P│
│ │ │ │ │
└───────┴───────┴───────┴───────┘
If the NBG0 and NBG1 1/4 reduction enable bits (N0ZMQT, N1ZMQT) are set to enable reduction to 1/4, the size of the NBG0 and NBG1 maps will be different from normal. In this case, the plane size of the screen that is set to be able to be reduced to 1/4 should not be 2 pages wide x 2 pages tall. Figure 4.16 shows the size of the map depending on the reduction settings.
Figure 4.16 Map plane placement with zoom settings
●When NBG0 is set to be able to be reduced to 1/4
┌────────┬────────┐
│For NBG0│For NBG0│
│Plane A │Plane B │
│ │ │
├────────┼────────┤
│For NBG0│For NBG0│
│Plane C │Plane D │
│ │ │
├────────┼────────┤
│For NBG2│For NBG2│
│Plane A │Plane B │
│ │ │
├────────┼────────┤
│For NBG2│For NBG2│
│Plane C │Plane D │
│ │ │
└────────┴────────┘
●When NBG0 is set to be able to be reduced to 1/4
┌────────┬────────┐
│For NBG1│For NBG1│
│Plane A │Plane B │
│ │ │
├────────┼────────┤
│For NBG1│For NBG1│
│Plane C │Plane D │
│ │ │
├────────┼────────┤
│For NBG3│For NBG3│
│Plane A │Plane B │
│ │ │
├────────┼────────┤
│For NBG3│For NBG3│
│Plane C │Plane D │
│ │ │
└────────┴────────┘
