Maybe you can answer to this. I was thinking a couple of days ago whether they were playing multiple matches simultaneusly at the Kooyong Stadium, as it had three courts. It might be interesting to see three matches simultaneously but distracting for the other two courts' players if the crowd starts to cheer after a long rally on one court.
Sorry, I have no idea about this. I never saw much of the AO in the 80s, with troublesome time zones plus bad TV coverage.