When I worked at DEC in the 80s we had these HP 7580 pen plotters, absolute monsters that could do color plots on D-sized drafting paper, which is an enormous 22x34 inch work area. Slow but super cool to watch in action, and the results had that vector display accuracy you couldn't get on regular printers of the time.
(To be honest though what I saw it getting used for most was plotting gate array layouts for chips we were designing, so people could hang them in their office.)












