a) The 8284A is a clock generator for 8086 microprocessors. i) Describe FOUR (4) functions of 8284A to the 8086 microprocessors. ii) Give the frequency of the crystal oscillator connected to the 8284A. (4 marks) (1 marks) b) Bus timing in 8086 microprocessors consists of read and write cycle. Each bus cycle equals four system clocking periods (T states). Discuss a complete bus timing for the read cycle. Draw a bus cycle diagram to help illustrate your answer. (5 marks) List and differentiate TWO (2) modes of operation for the 8086 microprocessors. (6 marks) d) Describe ONE (1) advantage and ONE (1) disadvantage of multiplexed bus in the 8086 microprocessors. (4 marks)