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Not having access to a PDP-11 (maybe this works on an emulator?) is it cheating to ask what the output of this program is?

According to http://www.ioccc.org/faq.html, it is equivalent to

  main(){
    int i=512;
    do
      write(1,"  :-)\b\b\b\b",9),usleep(i);
    while(--i);
  }

So, it moves a smiley on the screen, at increasing speed.