From: joemonk64@gmail.com   
      
   > >   
   > >Point is, at the hardware level, there is no way to distinguish code from   
   data. A perfect example is the EX instruction. You can dynamically use "DATA"   
   to modify code, and then execute the modified code.   
   > >   
   > Indeed, self-modifying code (which is generally avoided in modern   
   > systems) blurs the line between code and data. Fortunately, on modern   
   > systems, self-modifying code is generally avoided (and most modern   
   > systems protect the 'code' segment against modification by marking   
   > the page as read-only). The Burroughs large systems, for example,   
   > did not support self-modifying code, even in 1965.   
   >   
      
   I think you misunderstand the EX instruction...   
      
   Joe   
      
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