Display1in mp

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Display1in mp

  1. 2. WHY 8279??? <ul><li>WHAT WE KNOW, </li></ul><ul><li>8255 can be used in interfacing keyboards and displays. </li></ul><ul><li>The disadvantages of this method of interfacing keyboard and display is that the processor has to refresh the display and check the status of the keyboard periodically </li></ul><ul><li>using polling technique. </li></ul><ul><li>Thus a considerable amount of CPU time is wasted, reducing the system operating speed. </li></ul><ul><li>Intel’s 8279 is a general purpose keyboard display </li></ul><ul><li>controller that simultaneously drives the display of a </li></ul><ul><li>system and interfaces a keyboard with the CPU, leaving it </li></ul><ul><li>free for its routine task. </li></ul>

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