请指点一下？

[chinaonl]

CODE SEGMENT
ORG 100H
MAIN PROC NEAR
MOV AL,10110110B
OUT 43H,AL
MOV AX,4A9H
OUT 42H,AL
MOV AL,AH
OUT 42H,AL
IN AL,61H
PUSH AX
OR AL,3
OUT 61H,AL
MOV AH,1
INT 21H
POP AX
OUT 61H,AL
RET
MAIN ENDP
CODE ENDS
END MAIN

为什么通不过编译，我用的是MASM5.1

[大熊猫侯佩]

masm611 编译无错误。

[大熊猫侯佩]

你的错误是什么