Conversational Programming System or CPS was an early Time-sharing system offered by IBM which ran on System/360 mainframes circa 1967 through 1972. CPS was implemented as an interpreter, and users could select either a rudimentary form of BASIC or a reasonably complete version of PL/I. A third option provided remote job entry (RJE) features allowing users to submit JCL JOB Streams for batch processing. CPS was ultimately superseded by TSO. Some installations ported CPS so that it could run as a command-invoked subsystem under TSO.
