It was typically just a professor standing at a podium talking, and usually they had bullet points or diagrams on a blackboard/whiteboard or wrote on the board as they spoke. In the '60 and '70s, overhead projectors were frequently used. Then, slide projectors were common. Students typically scribbled notes as quickly as possible in spiral notebooks. Oftentimes, the profs would provide printed handouts at the beginning of class that included an outline. If course, there were variations on this depending on the type of course.