Extreme color bias?

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I have an old ATI 3D Rage Pro AGP 1X/2X rev 92 and a ViewSonic VA902b. 
The color rendition is biased in the extreme to magenta.  I'm looking
for pointers to what part of xorg.conf or some other setup file might
be having this affect.  The only strange thing I've seen thus far is
that xorg.conf has gamma == 1 while the log shows 2.2

I'm a newby so don't make any assumptions about my knowledge of acronyms etc.