Atari XL

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The Afar; XL Handbook
The Character Q
derived. Take row 6 as it has an example of each of
the four possible bit combinations.
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Row 6 of the character Q
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The first bit pair is 00, which means the pixel
represented by that bit pair takes its colour from
register 4. The second pair, 11, specifies register 2,
the third register 0 and the fourth register-L. So
the four pixels comprising the seventh row of the
letter Q in our example should each be in the
default colours of those four registers. If you look
closely at the screen you will find this to be the
case.