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| In the original PC AGI interpreter v2.936 the engine holds the color and priority/control
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| line information for each pixel in a 160x200 byte buffer. The color data for each pixel
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| is held in the byte's lower 4 bits and the priority/control line data is held in the upper
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| 4 bits.
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| AGI256 extends this 160x200 byte buffer to a 320x200 byte buffer so that the 256-color
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| data is held in the right 160x200 half of the buffer and the original style 16-color and
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| priority/control line information is held in the left 160x200 half of the buffer.
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