Commodore Amiga A2000 - MOVING (SCROLLING) PLAYFIELDS

Combination 000 selects transparent mode, to show the color of whatever object (the
other playfield, a sprite, or the background color) may be "behind" the playfield.
Table 3-12 shows the color registers for high-resolution, dual-playfield mode.
Table 3-12: Playfields 1 and 2 Color Registers- High-resolution Mode
PLAYFIELD 1
Bit Color
Combination Selected
00 Transparent mode
01 COLOR1
10 COLOR2
11 COLOR3
PLAYFIELD 2
Bit Color
Combination Selected
00 Transparent mode
01 COLOR09
10 COLOR10
11 COLOR11
DUAL-PLAYFIELD PRIORITY AND CONTROL
Either playfield 1 or 2 may have priority; that is, either one may be displayed in front of
the other. Playfield 1 normally has priority. The bit known as PF2PRI (bit 6) in register
BPLCON2 is used to control priority. When PF2PRI = 1, playfield 2 has priority over
playfield 1. When PF2PRI = 0, playfield 1 has priority.
You can also control the relative priority of playfields and sprites. Chapter 7, "System
Control Hardware" shows you how to control the priority of these objects.
You can control the two playfields separately as follows:
o They can have different-sized representations in memory, and different portions of each
one can be selected for display.
o They can be scrolled separately.
- 66 Playfield Hardware -