From: joemonk64@gmail.com   
      
   > A20 has to be enabled before entering PMode. Processor operation is   
   > undefined otherwise.   
      
   > If you want processors to perform to spec you have to ensure A20 is   
   > enabled before entering PMode.   
      
   All modern PC's start with A20 enabled.   
      
   As you can see from the provided example: http://www.scs.stanfor   
   .edu/05au-cs240c/lab/i386/s10_05.htm there is no check to see if A20 is   
   enabled before going to protected mode.   
      
   Joe   
      
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