/***********************************************************************\
*
*  Checks to see if a Cirrus Logic chipset is present.
*
*  Useful to double check the Trident query.
*
*  You should also move the VESA detection to the head of the list.
*
\***********************************************************************/

#include <STDIO.H>

void main ()
{
   char result;

   asm {
      mov   AL, 0x27
      mov   DX, 0x03D4
      out   DX, AL
      inc   DX
      in    AL, DX
      mov   result, AL
      }
   if (result & 0x80)
      printf ("\nCirrus Logic 54xx chipset found.");
   else
      printf ("\nNot a Cirrus Logic card.");
}