A PDP-9 in the Parkes observatory is used to calculate the position of the Apollo spacecraft in the sky.
Year of feature (shown above)
This PDP-9 is not just a movie prop, it is the actual PDP-9 that came from the Parkes observatory. The late Max Burnet sold Parkes the PDP-9 and later acquired it for his personal collection when they were finished with it. Max stayed with the PDP-9 during filming to insure that it ran OK.