When IBM dominated. Sadly now, not any more.
https://www.popsci.com/science/nasa-voyager-computers-video/
From the video embedded in the article, decent amount of IBM equipment shown, but the highlight of the video is from 7:10-8:49, showing an IBM punch card machine in action:
https://www.youtube.com/watch?v=T_bqc76_3xU
Also in the video, gotta love the mention (4:04-4:28) of the fact that no one but one guy who's left knows how a lot of the old equipment works because all the rest of them have been laid-off.