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Conversational Programming System

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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. A forth option was called control mode. Normally, only the system operator would be permitted to use control mode. The available features in control mode included:

  • Send a message to an individual user or all users.
  • Clobber (today it would be called re-boot) a specific user's virtual CPS machine.
  • Monitor the activity of an individual user.
  • Terminate the entire CPS system.

CPS provided a highly interactive user experience. It accomplished this by giving an immediate syntax error (when necessary) as soon as each line of a program was entered.

Early versions of CPS were designed to run on the IBM 2741 terminal. Later support was added for the IBM 2260 terminal.

CPS was ultimately superseded by TSO. Some installations ported CPS so that it could run as a command-invoked subsystem under TSO.


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