Commodore Amiga A2000 - Figure 3-3 How Bit-Planes Select a Color

_______________________________
| _
| |_| Bit plane 5
| ____________________________ __
| | _ |0 |_ --------
| | |_| Bit plane 4 |_|0 |_ |
| | _________________________ |_|1 |_ \__ See below
| | | _ |_|1 |_ /
| | | |_| Bit plane 3 |_|1 | |
| | | ______________________ |__| -----
| | | _
| | | |_| Bit plane 2
| | | ___________________
| | | _
| | | |_| Bit plane 1
| | |
| | ^
| | |
| |
| \-------------- One pixel
Bits from planes 5,4,3,2,1
Color Registers
_______________________
| |
00000 | |
|_______________________|
| |
00001 | |
|_______________________|
| |
00010 | |
|_______________________|
| |
00011 | |
|_______________________|
| |
00100 | |
|_______________________|
| |
| | |
| | |
----- | \|/ |
| |
|_______________________|
| |
11111 | |
|_______________________|
Figure 3-3: How Bit-planes select a Color
Values in the highest numbered bit-plane have the highest significance in the binary
number. As shown in Figure 3-4, the value in each pixel in the highest-numbered bit-
plane forms the leftmost digit of the number. The value in the next highest-numbered bit-
plane forms the next bit, and so on.
- Playfield Hardware 37 -