GFA Artist file format

GFA Artist    *.ART

Referred to as '1000-Colors OFF' in the manual. This format is similar to the format
used in colorStar.

16 words       palette
32000 bytes    st low resolution screen dump
-----------
32032 bytes    total file size

Referred to as '1000-Colors ON' in the manual. This format is more complex because of
the 1000 color mode.

1 word         number of planes [4]
1 word         unused (reserved)
32000 bytes    st low resolution screen dump
16 words       normal palette used when 1000 color mode is off
16*69 words    69 palettes used when the 1000 color mode is on
1 long         color cycling flag [0 = off, 1 = on]
1 long         color cycling speed [0 to 20]
9 longs        start palette number of 9 definable color cycling zones
9 longs        end palette number of 9 definable color cycling zones
9 longs        direction of the 9 definable color cycling zones 
                 [0 = off, 1 = forward, 2 = backwards]
-----------
34360 bytes    total file size

Regarding the '1000-Colors ON' mode. The layout of the rasters and how to calculate the
color of a pixel at a given x/y coordinate is unknown.

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