使用栈交换两个字节

DATAS SEGMENT
      X DW 5
      Y DW 3
DATAS ENDS

STACKS SEGMENT
    MOV SS,AX
    MOV SP,1000
STACKS ENDS

CODES SEGMENT
    ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
    MOV AX,DATAS
    MOV DS,AX
    MOV AX,X
    MOV BX,Y
    PUSH AX
    PUSH BX
    POP AX
    POP BX
    MOV X,AX
    MOV Y,BX
    
    MOV AH,4CH
    INT 21H
CODES ENDS
    END START