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Table 3-6: Play field Memory Requirements
Number of Bytes
Picture Size
Modes
per Bit-Plane
320 X 200
Low-resolution,
8,000
non-interlaced
320 X 400
Low-resolu tion,
16,000
interlaced
640 X 200
High-resolution,
16,000
non-interlaced
640 X 400
High-resolu tion,
32,000
interlaced
A normal low-resolution, non-interlaced display has 320 pixels across each display line
and a total of 200 display lines. Each line of the bit-plane for such a display requires 40
bytes (320 bits divided by 8 bits per byte
=
40).
A low-resolution, non-interlaced playfield made up of two bit-planes requires 16,000
bytes of memory area. The memory for each bit-plane must be continuous, so you need
to have two 8,000-byte blocks of available memory. Figure 3-7 shows an 8,000-byte
memory area organized as 200 lines of 40 bytes each, providing 1 bit for each pixel posi-
tion in the display plane.
42 Playfield Hardware
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