====== 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''.)

===== CTSS Command Summary =====

<code>
attach
bkgrnd
brief
chball
chmod
combin
comment
confrm
cpu
delete
ditto
edit
fap
file
input
listf
load
login 
logout
mad
madtrn
memo
modify
octlk
octpat
patch
pm
printf
releas
rename
resume
retrve
rquest
save
split
start
status
stopat
time
tra
use
</code>

===== 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].