alt Hacker NewsCompilers in 1980 generated 64k code segments and had no other memory model.
Most people wrote assembler particularly if they wanted to use more then 64k.
Most non assembly programs were interpreted oddly enough and most such interpreters were also mostly 64k.
I recall turbo (Pascal I guess but I was a kid and this was 40 years ago) having options, small for all in one. Then code and data in different segments, but only one each. Then code in one but multiple data, and finally multitude of both. I probably remember the options a bit off but there is enough to state that compilers could handle segments. Though they didn't optimize it well and so the smallest option was fastest