CTSS-the compatible time-sharing system

Excerpts are presented from a 1962 paper by Fernando Corbato, M. Merwin-Daggett, and R.C. Daley. The selection from the paper, which reported work completed in late 1961, is reprinted from Proc. Spring Joint Computer Conf., vol.21, 1962. In this system, the time-sharing occurs among four users, three of whom are online each at a typewriter in a foreground system, and a fourth passive user of the background FAP-MAD-MADTRAN-BSS Monitor System used by most of the MIT Computation Center programmers and by many other 7090 installations.<>