From: mokomoji@naver.com   
      
   2019년 9월 4일 수요일 오후 7시 54분 21초 UTC+9, JJ 님의 말:   
   > What kind of scenario when we need to use the /A switch of the COPY command?   
   >    
   > I know what it does, but I don't see any advantage of using it. In fact,   
   > when used, the resulting file copy may not be an identical copy if the   
   > source file contains an  marker - which defeat the purpose of the file   
   > copying process.   
      
   maybe..   
   rs232c control command   
   ascii Communication technology   
      
   pair   
   copy /a com1 com2   
      
   consol input   
   copy /a con com1   
      
   file input   
   type file.txt >com1   
      
   display com2   
   type com2   
      
   on => link device rs232c => boot device   
   off => link device rs232c => turn off device   
      
      
   maybe 7bit ascii communication use?   
   or Binary comunication use    
   copy /b source.txt com2   
      
   Reference Document-language korean   
   https://blog.naver.com/mokomoji/130174037573   
   https://blog.naver.com/mokomoji/130173983629   
   https://blog.naver.com/mokomoji/130173981841   
   https://blog.naver.com/mokomoji/130173976377   
      
   copy /b    
   The most famous technology   
      
   win 3.1 make win.com file   
   COPY /B WIN.CNF+VGALOGO.LGO+VGALOGO.RLE WIN.COM     
   vgaloogo.rle => image and bmp noheader information file   
      
   Reference Document-language english   
   http://www.win31.de/etips.htm   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)