#define OUTPUT_FILL		13
#define OUTPUT_DRAIN		12

main()
{
  o=gvarget(7184);	//read OUTPUT PORT 0 state (pins 0...31)
  drain_state=o&(1<<OUTPUT_DRAIN);
  fill_state=o&(1<<13);

  if (eparam==0) //toggle drain
  {
   if (drain_state==0)
   {
	portset(OUTPUT_DRAIN);
	portclr(OUTPUT_FILL);	//to prevent both are open
   }else
   {
	portclr(OUTPUT_DRAIN);
   };
  }else //toggle fill
  {
   if (fill_state==0)
   {
	portset(OUTPUT_FILL);
	portclr(OUTPUT_DRAIN);	//to prevent both are open
   }else
   {
	portclr(OUTPUT_FILL);
   };
  };
exit(99);
};