Question: Describe the working of 8279 programmable keyboard/display interface IC. Explain how the read-back control word functions in the 8254. Interface the 8279 so that it

  1. Describe the working of 8279 programmable keyboard/display interface IC.

  1. Explain how the read-back control word functions in the 8254.

  1. Interface the 8279 so that it functions at 8-bit I/O ports 40H-7FH. Use the 74LS138 as a

decoder and use either the upper or lower data bus.

  1. Interface a 16-key keyboard and an 8-digit numeric display to the 8279.

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