简答题

现有(DS)=2000H ,(BX)=0100H,(SI)=0002H,(20100H)=12H,(20101H)=34H,(20102H)=56H,(20103H)=78H,(21200H)=2AH,(21201H)=4CH,(21202H)=0B7H,(21203H)=65H,说明下列指令执行后AX寄存器的内容。   (1)MOV  AX,1200H  (2)MOV  AX,BX   (3)MOV AX,[1200H]   (4)MOV  AX,[BX]  (5)MOV  AX,1100H[BX]   (6)MOV  AX,[BX][SI]   (7)MOV  AX,1100H[BX][SI]

正确答案

(1)指令MOV AX,1200H执行后,(AX)=1200H (立即数操作数)。
(2)指令MOV AX,BX执行后,(AX)=0100H (寄存器操作数)。
(3)指令MOV AX,[1200H] 执行后,(AX)=4C2AH(直接地址,EA=1200H)
(4)指令MOV AX,[BX] 执行后,(AX)=3412H(寄存器间接寻址,EA=0100H)
(5)指令MOV AX,1100H[BX] 执行后,(AX)= 4C2AH(相对地址,EA=1200H)
(6)指令MOV AX,[BX][SI] 执行后,(AX)=7856H(基址变址寻址,EA=0102H)
(7)指令MOV AX,1100H[BX][SI] 执行后,(AX)=65B7H
(相对基址变址寻址,EA=1202H)

答案解析

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