We had one called "Systems Programming" that was a whirlwind intro to everything Unix (6 weeks on bash, 6 weeks on C, 6 weeks on Perl, a mishmash of SSH and everything-is-a-file and Unix-philosophy, etc)

We had another called "Operating Systems" that focused on things like concurrency, building a really basic memory pager, etc (mix of C and Java I think)

And we had one other called "Networking" that was sort of along the same lines as "Operating Systems" but focused on, well, networking. Mostly Java; we wrote our own application-layer protocols, that sort of thing

But yeah pretty much everything else - including the more "concrete" programming courses like Data Structures and Algorithms - was fairly abstracted away from any specific system