openMSX/share/extensions/hirestimer.xml

<?xml version="1.0" ?>
<!DOCTYPE msxconfig SYSTEM 'msxconfig2.dtd'>
<msxconfig>
  <devices>
    <HiResTimer id="HiResTimer">
      <io base="0x20" num="4"/>
    </HiResTimer>
  </devices>
</msxconfig>