ED or ED-1100[1] is an interactive text editor implemented on the UNIVAC 1100/2200 series.
"ED was developed at Univac in the mid-60s. It was loosely based on the Project MAC editor developed for the MULTICS system at MIT."-Tom McCarthy[1]
"Project MAC editor was programmed by Jerry Saltzer as a way to produce documentation. In fact, that editor became the first interactive word-processor ever programmed."[1]
"The command TYPSET is used to create and edit 12-bit BCD line-marked files"[2]
ED was improved by Dr. Roger M. Firestone in the mid-1970s.[1]
Original source: https://en.wikipedia.org/wiki/Univac Text Editor.
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