From: "Andy"    
      
   On Mon, 23 May 2011 21:05:31 UTC, Jonathan de Boyne Pollard    
    wrote:   
      
   > > I have a config.sys that boots to CMD only without any USB drivers,    
   > > and here USB keyboard still works fine. :-)   
   > >   
   > ... as it would, because in PS/2 emulation mode (which M. Erdmann is    
   > erroneously calling "legacy mode"), your machine's firmware is handling    
   > the USB hardware in System Management Mode and making it seem, to    
   > everything else, as though there is an i8042 keyboard and mouse    
   > connected, including to the operating system and to its device drivers.   
   >    
   The BIOS calls it legacy mode so erroneously is not quite the proper    
   way of stating the above.  More properly written would be:   
   "legacy mode",  more precisely, "PS/2 emulation mode" ...   
      
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