Bits from Planes Bit-Plane 5
5,4,3,2,1 Color Registers
Bit-Plane 4 Bit-Plane 3
One Pixel
00000 00001 00010 00011 00100
11000 11001 11010 11011 11100 11101 11110 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 bitplane forms the leftmost digit of the number. The value in the next highest-numbered bit-plane forms the next bit, and so on.
32 Playfield Hardware