Back in the 1980's when I was in high school, if I recall correctly (please note the time variance), there were times when we were asked to use just CR ($chr(13)) without LF ($chr(10)) in order to over-write lines printed with other lines.
The purpose of this task was to try to make it hard/impossible to read what was on the first run by other students. I didn't really understand the purpose of doing this, but that was what the instructor wanted so that's what he got.
These days, I don't know if it's possible to just have CR without LF.
