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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