prog6_11.asm

汇编语言-王爽 源代码 加 卜艳萍版源代码

stack  segment stack
       dw  100 dup(?)
stack  ends
data  segment
buff  dw  3c6dh
data  ends
code  segment
      assume  cs:code,ds:data,ss:stack
start:mov  ax,data
      mov  ds,ax
      lea  si,buff
      mov  bx,[si]
      mov  ch,4
   a1:mov  cl,4
      rol  bx,cl
      mov  al,bl
      and  al,0fh
      add  al,30h
      cmp  al,3ah
      jl  a2
      add  al,7h
   a2:mov  dl,al
      mov  ah,2
      int  21h
      dec  ch
      jnz  a1
      mov  ah,4ch
      int  21h
code  ends
      end  start