Hi Sven -- the sad thing is that I can imagine younger engineers saying to themselves "Bell Bottom Trousers -- what are they?"
I recall having ones that wrere 22" around the bottom -- looking back that really was a pretty ridiculous style (not as silly as the platform shoes, of course) -- now I'm wondering what my father thought about it all :-)
There are many proprietary buses at that time. There are still some today but most test equipment uses GPIB, USB, or Ethernet with some also using RS-232/422/485 thought those are more for industrial use now. UAB has replaced RS-232 in many small pieces of test equipment.