I worked at Datasaab, in New York, in 1977. We were building a system for tellers to use in interacting with customers. I don't remember the computer model names, but I do remember the language -- DIL 16. It was a weird language that looked like assembler, but was actually higher level, with lots of string operations. I remember that my coworker built a B-tree in DIL 16. That was a fairly new data structure at the time, and it was the first time I had encountered it. (I thought it was incredibly elegant, and perhaps that is why I went on to study databases in grad school.)
We deployed versions of software by loading up a 5(?) MB hard disk with our code, and walking it over from our development office downtown, to the bank branch that was testing it out.
I was working at Datasaab during the day, and going to grad school (NYU) in the evenings. After a year, I left Datasaab to concentrate on my studies (at a different school).