BASIC PLAYFIELD SUMMARY
The steps for defining a basic playfield are summarized below:
1. Define Playfield Characteristics
a. Specify height in lines:
o For NTSC:
* 200 for non-interlaced mode.
* 400 for interlaced mode.
o For PAL:
* 256 for non-interlaced mode.
* 512 for interlaced mode.
b. Specify width in pixels:
o 320 for low-resolution mode.
o 640 for high-resolution mode.
c. Specify color for each pixel:
o Load desired colors in color table registers.
o Define color of each pixel in terms of the binary value that points
at the desired color register.
o Build bit-planes.
o Set bit-plane registers.
* Bits 12-14 in BPLCON0 - number of bit-planes (BPU2 - BPU0).
* BPLxPTH - pointer to bit-plane starting position in memory
(written as a long word).
- 57 Playfield Hardware -
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