From: src153@nospicedham.protocol.invalid   
      
   On Fri, 6 Sep 2019 14:38:40 +0700, JJ wrote:   
      
   > If there's no Int 13h Extension support, then you'll have to use port I/O.   
   > Check xtideuniversalbios project's source code to see how it implements the   
   > Int 13h Extension.   
      
   Jacks's UHDD.SYS hooks INT 13h to provide UDMA for DOS, much faster than   
   PIO. Looks like XTIDE only does PIO.   
      
   UHDD.SYS also has source code. Probably not an easy read though.   
      
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