DOS程序退出方法

DATAS SEGMENT    
    msg db 'HELLO WORLD',13,10,'$'
DATAS ENDS
    STACKS SEGMENT
    dw 10 dup(0)
STACKS ENDS

CODES SEGMENT
    ASSUME CS:CODES,SS:STACKS
MAIN PROC FAR
START:
    PUSH ES
    XOR AX,AX
    PUSH AX
    MOV AX,DATAS
    MOV DS,AX
    MOV DX,OFFSET msg
    MOV AH,9
    INT 21H
    RET
MAIN ENDP    
CODES ENDS
    END START

DATAS SEGMENT    
    msg db 'HELLO WORLD',13,10,'$'
DATAS ENDS
STACKS SEGMENT
    dw 16 dup(0)
STACKS ENDS

CODES SEGMENT
    ASSUME CS:CODES,SS:STACKS
    MOV AX,4C00H
    INT 21H
START:
    MOV AX,STACKS
    MOV SS,AX
    SUB SP,10
    PUSH CS
    XOR AX,AX
    PUSH AX
    MOV AX,DATAS
    MOV DS,AX
    MOV DX,OFFSET msg
    MOV AH,9
    INT 21H
    RETF;RET
CODES ENDS
    END START