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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0001:  Power Supplies - System Board

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XIV  AMR
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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.

  • Polling

  • Interrupting

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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