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XV Demanding Attention Digitally
Even the simplest CPU
that is involved with sub-systems needs
to be interrupted to tell it to pay attention
to another sub-system. In simple terms, a CPU
(more or less) does one thing at a time,
at a very high speed. The trick is to make
it appear to be doing more than one
thing at a time.
This can happen in
one of two fashions.
This approach involves the
CPU asking each device if it needs the CPU's
time. Typically this is not done on a PC.
Just think of how much time would be wasted with the answer
typically being, no.
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CertiGuide to A+ (Core Hardware) (http://www.CertiGuide.com/aplush/) on CertiGuide.com
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