The Lisp Machine is a new computer system designed to provide a high-performance and economical implementation of the Lisp language. It is a personal computation system, which means that processors and main memories are not time-multiplexed: when using a Lisp Machine, you get your own processor and memory system for the duration of the session. It is designed this way to relieve the problems of running large Lisp programs on time-sharing systems. Everything on the Lisp Machine is written in Lisp, including all system programs; there is never any need to program in machine language. The system is highly interactive.
- First paragraph in the Lisp Machine Manual, Daniel Weinreb& David Moon, 1981