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C/C++ Source or Header  |  1988-08-11  |  309 b   |  18 lines
  1. /* Listing 12-2 */
  2.  
  3. int    VRcount = 0;            /* vertical interrupt counter */
  4.  
  5. main()
  6. {
  7.     if ( EnableISR0A() )
  8.     {
  9.       printf( "\nCan't enable vertical interrupt handler\n" );
  10.       exit( 1 );
  11.     }
  12.  
  13.     while (VRcount < 600)
  14.       printf( "\015Number of vertical interrupts:  %d", VRcount );
  15.  
  16.     DisableISR0A();
  17. }
  18.