1、编制子程序：把AL寄存器内的二进制数用十六进制形式在屏幕上显示。(要求用简化段汇编语言实现)

.model small
.code
start:
  mov al,2DH
  mov ch,2
  mov cl,4
  mov ah,2
  mov bl,al
p0:
  rol bl,cl
  mov dl,bl
  and dl,0fh
  cmp dl,9
  jbe p1
  add dl,7
p1:
  add dl,30h
  int 21h
  dec ch
  jnz p0

  mov ah,4ch
  int 21h

end start

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