Could the color differences be due to CTIA vs. GTIA? Do you know which chip your 800 has?
I don't remember any color difference between the CTIA & GTIA, but is has been over 30 years since I have had a CTIA. The GTIA does have more video modes.
The color on the Atari computers can be adjusted via a potentiometer.
On the 800 this potentiometer is on the CPU card, and can be adjusted through a hole on the back of the RF shield when the cover for the RAM/OS card bay is removed.
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