代码：
code segment
assume cs:code
start:
mov bx,1234H
sub ax,ax
mov ch,4
rotate:
mov cl,4
rol bx,cl
mov al,bl
and al,0fH
add al,30H
cmp al,3aH
jl print
add al,7H
print:
mov dl,al
mov ah,2
int 21H
dec ch
jnz rotate
mov dl,'H'
mov ah,2
int 21h
mov ah,4ch
int 21h
code ends
end start
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