I certainly remember the 6600

I joined CDC UK in 1970 and was first employed at the University of London Computer Centre which had a 6600 and later a 6400 and 7600. SIA in Victoria also had a 6600. I remember being blown away at the way the Cray team had designed the hardware. Brilliant!!! I still remember tuning clocks and 7 inches being equivalent to a Nanosecond. Ho Hum