less_retarded_wiki/dinosaur.md

Dinosaur

In the hacker jargon dinosaur is a type of a big, very old, mostly non-interactive (batch), possibly partly mechanical computer, usually an IBM mainframe from 1940s and 1950s (so called Stone Age). They resided in dinosaur pens (mainframe rooms).

{ This is how I understood it from the Jargon File. ~drummyfish }