Question

一刀简单的题目?5. 计算下列4条指令中操作数的地址并指出执行结果：(1) MOV 1[BX+SI], AX(2) MO

Answer 1

执行：

(1) EA = 300H + 50H +1H = 351H

DS:(351H) = 12H

即(10351H) = 12H

(4) EA = 400H + 60H +4H = 464H

SS:(464H) = 15H

即(20464H) = 15H

(2)(3)类似

【基址+变址寻址方式】:[BR + IR*F + V]

当BR=BX时,默认段寄存器为DS;

当BR=BP时,默认段寄存器为SS;

物理地址 = 段首地址 * 10 + 偏移地址