Q.1 Explain why each of the following statements are invalid: .data Val BYTE 100 Val2 BYTE ? wVal WORD 2 dVal DWORD 5 Num1 WORD ? Num2 WORD ?

.code movsx wVal,bl xchg Val,Val2 add ds,10 mov 25,Val mov eip,Val add Num1, Num2 mov cs,45 mov esi,wVal mov Val2,Val xchg ax, 25

Q.2 Use the following variable definition (50 points)

.DATA var1 SBYTE -4,-2,3,1 var2 WORD 1000h, 2000h, 3000h, 4000h var3 SWORD -16, -42 var4 DWORD 1,2,3,4,5

What will be the value of the destination operand after each of the following instructions execute in sequence? mov al,var1 mov ah, [var1+3] mov ax, var2 mov ax, [var2+4] mov ax, var3 mov ax,[var3-2] mov edx, var4 movzx edx, var2 mov edx,[var4+4] movsx edx, var1