有点不明白?
assume cs:codecode segment
start: mov al,9
out 70h,al
in al,71h
mov ah,al
mov cl,4
shr ah,cl
and ah, 00001111b
add ah,30h
add al,30h
mov bx,0b800h
mov es,bx
mov byte ptr es:,ah
mov byte ptr es:,al
mov ax,4c00h
int 21h
code ends
end start
为什么答案是: 1B?????
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