Q2) Answer the followings: (a) What is the main difference between op code & operand? (b) Assume that the contents of 8086 registers are [ DS= A248H, CS= 1200H, AX=BC45H, DI=E5C9H, SS=1480H, SI=4B1CH, CX=CF63H] and the contents of memory at specified address are [ (A467FH)=91H, (141FEH)=ABH, (141FFH)=B8H, (A467EH)=D8H]; show the result of executing the following instruction: XCHG SI, [21FEH]

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