SIGNAL void prob3_sim (void) {
  printf("prob3_sim loaded...\n\n");
  PORT4  =  0x01;twatch(100*41779);
  PORT4 &= ~0x01;twatch(  1*41779);
  PORT4 |=  0x01;twatch(  2*41779);
  PORT4 &= ~0x01;twatch(  1*41779);
  PORT4 |=  0x01;twatch(  2*41779);
  PORT4 &= ~0x01;twatch( 50*41779);
  PORT4 |=  0x01;twatch(100*41779);
  PORT4 &= ~0x01;twatch(  2*41779);
  PORT4 |=  0x01;twatch(  1*41779);
  PORT4 &= ~0x01;twatch(  2*41779);
  PORT4 |=  0x01;twatch(  1*41779);
  PORT4 &= ~0x01;twatch(150*41779);
  PORT4 |=  0x01;twatch(  5*41779);
  PORT4 &= ~0x01;twatch(  3*41779);
  PORT4 |=  0x01;twatch(120*41779);
  PORT4 &= ~0x01;twatch(  4*41779);
  PORT4 |=  0x01;twatch( 50*41779);
  PORT4 &= ~0x01;twatch(  2*41779);
  PORT4 |=  0x01;twatch(  1*41779);
  PORT4 &= ~0x01;twatch(  2*41779);
  PORT4 |=  0x01;twatch(  1*41779);
  PORT4 &= ~0x01;twatch(450*41779);
  PORT4 |=  0x01;twatch(  5*41779);
  PORT4 &= ~0x01;twatch(450*41779);
  PORT4 &= ~0x01;twatch(  2*41779);
  PORT4 |=  0x01;twatch(100*41779);
  PORT4 &= ~0x01;twatch( 15*41779);
  PORT4 |=  0x01;twatch(100*41779);
  PORT4 &= ~0x01;twatch(  3*41779);
  PORT4 |=  0x01;twatch(220*41779);
  while(1) {PORT4 = 0x01;twatch(1);}
}