下列哪一条是不合法的指令
A)MUL BX
B)MUL [BX]
C)MOV AL,02H
D)MOV AL,[BX]
参考答案：B
解析： MUL是8086的乘法指令，选项A中没有目的操作数，则默认的目的操作数是AX；但是，B选项中【BX】是一个存储器操作数，数据类型不能确定，目的操作数也就不能确定使用哪个寄存器。MOV是传送指令，C和D选项都有指定的目的操作数和源操作数，是正确的。
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