Introduction - If you have any usage issues, please Google them yourself
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).