"Editor for Mortals"
Author: [George Coulouris] History: http://www.dcs.qmul.ac.uk/~gc/history/index.html Source: http://www.dcs.qmul.ac.uk/~gc/history/emsource/em1.c Family: ViFamily Platform: PDP-11 License: CommercialEm was a modified version of Ken Thompson's ed editor for Unix, intended for screen editing.
Em was a direct predecessor of VI.