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@ -190,20 +190,20 @@ lines, as discussed in Chapter 42.
Finally, note that the border of the screen turns green when Listing
33.1 is run. Listing 33.1 reprograms DAC register 0 to green, and the
border attribute (in the Overscan register) happens to be 0, so the
border comes out green even though we haven’t touched the Overscan
border comes out green even though we haven't touched the Overscan
register. Normally, attribute 0 is black, causing the border to vanish,
but the border is an 8-bit attribute that has to pass through the DAC
just like any other pixel value, and it’s just as subject to DAC color
just like any other pixel value, and it's just as subject to DAC color
translation as the pixels controlled by display memory. However, the
border color is not affected by the palette RAM or by the Color Select
register.
In this chapter, we traced the surprisingly complex path by which the
VGA turns a pixel value into RGB analog signals headed for the monitor.
In the next chapter and Chapter A on the companion CD-ROM, we’ll look at
some more code that plays with VGA color. We’ll explore in more detail
In the next chapter and Chapter A on the companion CD-ROM, we'll look at
some more code that plays with VGA color. We'll explore in more detail
the process of reading and writing the palette RAM and DAC registers,
and we’ll observe color paging and cycling in action.
and we'll observe color paging and cycling in action.
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