实验14
assume cs:codecode segment
start: mov al,9
mov cx,3
mov si,0
s:push cx
push ax
out 70h,al
in al,71h
mov ah,al
mov cl,4
shr ah,cl
and al,00001111b
add ah,30h
add al,30h
mov bx,0b800h
mov es,bx
mov byte ptr es:,ah
mov byte ptr es:,al
pop ax
pop cx
dec cx
jcxz s1
mov byte ptr es:,2fh
add si,6
dec al
jmp s
s1: mov al,4
add si,6
mov cx,3
s2: push cx
push ax
out 70h,al
in al,71h
mov ah,al
mov cl,4
shr ah,cl
and al,00001111b
add ah,30h
add al,30h
mov bx,0b800h
mov es,bx
mov byte ptr es:,ah
mov byte ptr es:,al
pop ax
pop cx
dec cx
jcxz s3
mov byte ptr es:,3ah
add si,6
dec al
jmp s2
s3：mov ax,4c00h
int 21h
code ends
end start
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