Multics Emacs is an early implementation of the Emacs text editor. It was written in Maclisp by Bernard Greenberg at Honeywell's Cambridge Information Systems Lab in 1978, as a successor to the original 1976 TECO implementation of Emacs and a precursor of later GNU Emacs. Rather than using TECO's gap buffer representation for the text being edited, it used a doubly linked list of lines of text.