Shoot...I have a postcard aerial photo of the old terminal, probably taken around 1978, in my collection up in Rochester. Which I bought when I flew through ATL
in 1979. Here's a quick description:
The terminal complex was located north of the northernmost parallel set of runways. There's a big hotel with a swept-back front sitting on the spot now.
There was a two-story central building, about the size of YVR
's old building, with a four-or five story greenish-blue adminsitrative block with the control tower cab on top of it. A y-shaped concourse protruded from the middle. Corridors on each side, at about a 60-degree angle, linked to two finger concourses poking out parallel to the arms of the 'y.'
If you faced the terminal from the small garage, the two concourses to the right served Eastern. The two to the left served Delta. There was a one-story tiny international arrivals building attached to the outer Eastern concourse.
The "Y" concourse served All Other Airlines.
Eastern's innermost concourse, which was greenish-blue like the administrative building, had ground-level gates and no jetways. I still remember boarding and debarking on airstairs and walking outdoors. The outermost Eastern concourse was two-story with jetways, as were both Delta concourses. I think one or both of DL
's had a satellite at the end, too. I don't remember if the Y concourse had jetways, but I think at least part of it was ground-level.
Hope this helps!