prog6_4.asm

汇编语言-王爽 源代码 加 卜艳萍版源代码

data  segment
      buf  db  6dh
      buf1  db  ?
      buf2  db  ?
      buf3  db  ?
      buf4  db  ?
data  ends
code  segment
      assume  cs:code,ds:data
main  proc  far
start:push  ds
      mov  ax,0
      push  ax
      mov  ax,data
      mov  ds,ax
      mov  al,buf
      mov  cl,4
      shr  al,cl
      mov  buf2,al
      or  al,30h
      mov  buf4,al
      mov  al,buf
      and  al,0fh
      mov  buf1,al
      or  al,30h
      mov  buf3,al
      ret
main  endp
code  ends
      end  start