of 6 4. (a) Compare and contrast assembly language and a machine language (hexadecimal) as methods of programming a microprocessor. Explain the meaning of the term relocatable code. Give a simple example you have encountered to illustrate how it works. (3 marks) (b) Explain the meaning of the term LIFO register and give one instance of such a register in the case of a typical microprocessor. List three essential flags that are found in the flag register of every microprocessor, and comment on how they can be used by the programmer. (2 marks) (c) The Intel 8088 instruction set includes instructions DAA (decimal adjust for addition) and DAS (decimal adjust for subtraction). Illustrate the operation of the DAA instruction in the case of the addition of the decimal digits (i) 9+8 and (ii) 67+72. (1 mark) (d) Explain the function of each line in the assembly language program shown below. What function is performed by this program? Explain the significance of the order of the INC and DEC instructions. Show how you would modify this program to set = 5616 a series of 3510 memory locations starting at address CS:01B9. START MARK MOV BX, 01A0 MOV AH, 20 MOV AL, 41 MOV [BX], AL INC BX DEC AH JNZ MARK INT 20