The CTSS was the first time sharing computer system and was developed by MIT in the 1960s by Fernando Corbato, an American physicist and computer scientist. The project was funded by DARPA and went online in 1963. It was developed on various IBM systems, including the 709, 7090, and 7094 at the MIT Computation Center. A system of many firsts, it was the first to have a password login, and had one of the first computerized text editing and formatting utilities. Early versions of email and instant messaging systems were also developed.
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