Since the program could drive an IBM Selectric typewriter (a letter-quality printer), it may be considered the first word processing software. It was written and improved between 1961 and 1962 by Steve Piner and L. Peter Deutsch. In the spirit of an earlier editor program, named "Colossal Typewriter", it was called "Expensive Typewriter" because at that time the PDP-1 cost a lot of money (approximately US$100,000) as compared to a conventional manual typewriter.2
"Expensive Typewriter" (manual) Archived 2016-03-04 at the Wayback Machine, August 1, 1972, MIT http://archive.computerhistory.org/resources/text/DEC/pdp-1/DEC.pdp_1.1972.102650079.pdf ↩
"PDP-1 Price List". www.computerhistory.org. Retrieved June 17, 2022. https://www.computerhistory.org/pdp-1/ad6b7367b8cbd0133326c23c49a029d0/ ↩