(b) Write 8085 assembly language to: Clear accumulator Add 4EH Subtract 59H OR 50H AND 2BH XOR 71H Display the final result at port 06H Give a comment for each step of this program. [6 marks] Write a down counter program that uses pair register to count from 2BDFH until 0. (Hint: Use ORA for the pair register to check the zero flag) [7 marks]