A minicomputer made by Digital Equipment Corporation from 1970. It was widely used in labs and universities, and Unix was developed on it.
I worked at the State University of Campinas’s computer center on a PDP-11 with 5 MB of storage and 256 KB of memory—a real challenge.
Analívia Cordeiro, Analívia Cordeiro on Perpetual Motion
Tom DeFanti at EVL took that machine, added memory and a keyboard, and ported his GRASS language from the PDP-11 to create Zgrass, named for its Z80 processor.
Copper Giloth, Jane Veeder on Loving Change