====== CTSS ======

**CTSS** (//C//ompatible //T//ime-//S//haring //S//ystem) was developed in the early 1960s by the MIT Computation Center for the IBM 7090 and IBM 7094 mainframe computers. CTSS was the first general-purpose time-sharing operating system.

===== Log in =====

Choose host "ibm7094" from the SDF Vintage Systems menu.

When you have connected to CTSS, you will see a message similar to the following:

<code>
MIT8C0 2 USERS AT 06/30/72  814.6, MAX = 30
READY.
</code>

Log in with the command ''login guest''. (Or use your personal log in ID instead of "guest".)

After the red ''Password'' prompt, enter the password "guest" (or your own password).

===== Log out =====

Enter the command ''logout''.

(If you are not returned to the SDF Vintage Systems menu, press the escape character (Ctrl-]), then at the ''lcmtelnet>'' prompt enter ''q''.)

===== Further Information =====

  * F. Corbató, M. Daggett, R. Daley, R. Creasy, J. Hellwig, R. Orenstein, L. Korn, //The Compatible Time-Sharing System -- A Programmer's Guide//. Cambridge, MA: The M.I.T. Press, 1963. [[https://bitsavers.org/pdf/mit/ctss/CTSS_ProgrammersGuide.pdf]]. [Accessed June 30, 2024].
  * P. Crisman, editor, //The Compatible Time-Sharing System -- A Programmer's Guide// 2nd ed. Cambridge, MA: The M.I.T. Press, 1969. [[https://bitsavers.org/pdf/mit/ctss/CTSS_ProgrammersGuide_Dec69.pdf]]. [Accessed June 30, 2024].
  * E. Kliman, //Abstracts of CTSS Console Commands//. Massachusetts Institute of Technology: 1965. [[https://bitsavers.org/pdf/mit/ctss/CC-239-3_Abstracts_of_CTSS_Console_Commands_Mar65.pdf]]. [Accessed June 30, 2024].
  * Bitsavers' Computing Archive, "CTSS", [[https://bitsavers.org/pdf/mit/ctss/]]. [Accessed June 30, 2024].