长操作数指令中的一个重要问题是，高16位和低16位操作数在存储器中如何排列。一般情况下，高16位操作数放在存储器中的低地址单元，低16位操作数放在存储器中的高地址单元。例如一个长操作数16782345H，它在存储器中的存入方式是：（0060H）＝1678H（高字），（0061H）＝2345H（低字）。-Long-operand instructions, an important issue is that the high 16 and low 16-bit operand in memory how to order. Under normal circumstances, the high 16-bit operands in memory of the lower portion of the lower 16-bit operand in memory upper address unit. For example, a long operand 16782345H, it is stored in the memory of the way: (0060H) = 1678H (high word), (0061H) = 2345H (low word).