WHY 8279???

WHAT WE KNOW,8255 can be used in interfacing keyboards and displays. 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 periodicallyusing polling technique. Thus a considerable amount of CPU time is wasted, reducing the system operating speed. Intel’s 8279 is a general purpose keyboard displaycontroller that simultaneously drives the display of asystem and interfaces a keyboard with the CPU, leaving itfree for its routine task.