What did Universities use in lectures before they starting using PowerPoint? On my 'quest' to understand how universities have changed over the past decade(s), I'm curious as to how teaching in lectures was done before the days of PowerPoint (which as an undergraduate is seemingly the only thing I see all day, but I am sure it was not used anywhere near as extensively a decade or two ago). 

Needless to say I've still seen plenty of chalk use when calculations need to be done, but there is still not a lecture without PowerPoint. 

Thoughts:


Did they flip through the slides with a bit of narrative like they do today?
The 'you don't need to take notes, slides are on online' mentality of today must have been different.
I've gathered overhead projectors were the tool of the trade and handouts where more common. 
Most old lectures on YouTube (being taught by well known professors) never seem to use any PowerPoint. However, they seem to in general cover topics that deal more with theory and calculation than real examples and practical uses. 
Would the professor during a e.g. an engineering materials course (i.e. mostly content stuff) just go through slides on the overhead? The quality of what you can share seems pretty limited as opposed to full color images, or would they actually have more tools at their disposal?
I can go back to 1989, when I enrolled at the university (engineering). The first two years were mostly devoted to mathematics, physics, chemistry and circuit theory. No overheads were employed in those courses, just plain old blackboard. There was just a course on Fortran and Pascal where the professor probably employed overheads, but I skipped all the lectures so, well, I'm not sure about that.

Overheads really started to appear from the third year on, mainly for engineering courses about algorithms, digital circuits or solid state physics (alas, these were abysmal). Lecturers would deposit a printed copy of the handouts at a local photocopy shop, so that everyone could buy a copy. Certain courses had packs of around 1000 handouts, and frequently the handouts were not available till the end of the course. Luckily, most of the courses about analogue circuits, advanced electromagnetics and quantum physics were still delivered through the blackboard. 

It is worth recalling that at the time "overhead transitions" were implemented by means of patches and adhesive tapes. When printed, these "effects" would leave black marks of various shapes on the handouts.

Overheads were typically in full colours when handwritten, but the handouts were of course black and white, and writings in lighter colours were barely readable. Program listings were instead printed with black and white printers: no syntax colouring at the time.

Edit: I've just found under a pile of papers one of those packs of handouts. Here is how one of the pages looked like (two overheads per page; the pack is dated 1987):



The first overhead, on the left, is the text of an exercise ("Design a circuit with three inputs x,y,z [...]"), the overhead on the right is part of the solution. You might notice that on the upper right corner of the left overhead there are two page numbers: probably the overheads had been renumbered along the years.