已知数据段有:FIRSTDB12H,34HSECONDDB56H,78H用堆栈指令编写一程序段,实现将FIRST和SECOND单元的内容互换,FIRST+1和SECOND+1单元的内容互换

已知数据段有:FIRSTDB12H,34HSECONDDB56H,78H用堆栈指令编写一程序段,实现将FIRST和SECOND单元的内容互换,FIRST+1和SECOND+1单元的内容互换