266


main(int argc, char **argv)
{
unsigned char val, *ptr;
int freq;

     if(argc > 1)
     {

          freq = 1193180/atoi(argv[1]);

          ptr = &freq;

          outportb(0x43,0xB6);
          outportb(0x42,*ptr);
          outportb(0x42,*(ptr+1));

          val = inportb(0x61);
          val = val | 3;
          outportb(0x61,val);

          delay(1000);

          val = inportb(0x61);
          outportb(0x61,val ^ 3);
     }
     else
     {
          printf("BEEPER Beeps the PC speaker with a tone\n");
          printf("usage: beeper <tone_freq>\n");
     }
}
.

0