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James Gregory 2013-12-30 18:34:31 +11:00
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34-03.md
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@ -4,22 +4,22 @@
### A Test Program for Color Cycling {#Heading7}
Anyway, the choice of how to load the DAC is yours. Given that I’m not
providing you with any hard-and-fast rules (mainly because there don’t
Anyway, the choice of how to load the DAC is yours. Given that I'm not
providing you with any hard-and-fast rules (mainly because there don't
seem to be any), what you need is a tool so that you can experiment with
various DAC-loading approaches for yourself, and that’s exactly what
you’ll find in Listing 34.1.
various DAC-loading approaches for yourself, and that's exactly what
you'll find in Listing 34.1.
Listing 34.1 draws a band of vertical lines, each one pixel wide, across
the screen. The attribute of each vertical line is one greater than that
of the preceding line, so there’s a smooth gradient of attributes from
of the preceding line, so there's a smooth gradient of attributes from
left to right. Once everything is set up, the program starts cycling the
colors stored in however many DAC locations are specified by the
**CYCLE\_SIZE** equate; as many as all 256 DAC locations can be cycled.
(Actually, **CYCLE\_SIZE**-1 locations are cycled, because location 0 is
kept constant in order to keep the background and border colors from
changing, but **CYCLE\_SIZE** locations are *loaded*, and it’s the
number of locations we can load without problems that we’re interested
changing, but **CYCLE\_SIZE** locations are *loaded*, and it's the
number of locations we can load without problems that we're interested
in.)
**LISTING 34.1 L34-1.ASM**