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<title>Conversational Programming System</title>

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<p><b>Conversational Programming System</b><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> or <b>CPS</b> is an early <a href="Time-sharing" title="Time-sharing">Time-sharing</a> system offered by <a href="IBM" title="IBM">IBM</a> which runs on <a href="System/360" class="mw-redirect" title="System/360">System/360</a> <a href="Mainframe_computer" title="Mainframe computer">mainframes</a> <i>circa</i> 1967 through 1972 in a partition of <a href="OS/360" class="mw-redirect" title="OS/360">OS/360</a> Release 17 MFT II or MVT or above.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> CPS is implemented as an <a href="Interpreter_(computing)" title="Interpreter (computing)">interpreter</a>, and users can select either a rudimentary form of <a href="BASIC" title="BASIC">BASIC</a> or a reasonably complete version of <a href="PL/I" title="PL/I">PL/I</a>. A third option provides <a href="Remote_Job_Entry" class="mw-redirect" title="Remote Job Entry">remote job entry</a> (RJE) features allowing users to submit <a href="Job_Control_Language" title="Job Control Language">JCL</a> <a href="Job_stream" title="Job stream">job streams</a> for batch processing. A fourth option is called control mode. Normally, only the system operator would be permitted to use control mode. The available features in control mode include:

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<ul><li>Send a message to an individual user or all users.</li>

<li>Clobber a specific user's interpreter environment.</li>

<li>Monitor the activity of an individual user.</li>

<li>Terminate the entire CPS system.</li></ul>

<p>CPS provides a highly interactive user experience. It accomplishes this by giving an immediate <a href="Syntax_error" title="Syntax error">syntax error</a> (when necessary) as soon as each line of a program is entered.

</p><p>CPS was also offered with a firmware-assisted interpreter, on the <a href="IBM_System/360_Model_50" title="IBM System/360 Model 50">IBM System/360 Model 50</a>, only, but few Model 50 installations elected to install this <a href="Request_price_quotation" title="Request price quotation">RPQ</a>. This RPQ executed the <i>EVAL</i> function of CPS's programming stack using a firmware assist.

</p><p>The IBM-released version of CPS was designed to run on the <a href="IBM_1050" title="IBM 1050">IBM 1050</a> terminal and the <a href="IBM_2741" title="IBM 2741">IBM 2741</a> terminal with the "<a href="Break_key" title="Break key">break</a> feature". User groups later added support for the <a href="IBM_2260" title="IBM 2260">IBM 2260</a> video display terminal.

</p><p>CPS support for the IBM 2741 "break feature" most likely influenced the eventual user group support for the "break feature" and the IBM 1050 terminal on <a href="IBM_Administrative_Terminal_System" title="IBM Administrative Terminal System">IBM Administrative Terminal System</a> (ATS/360), as many IBM customers which operated CPS also operated ATS/360.

</p><p>CPS was ultimately superseded by <a href="Time_Sharing_Option" title="Time Sharing Option">TSO</a>. An IBM <a href="Software_as_a_Product" title="Software as a Product">program product</a> was offered which provided limited CPS functionality under <a href="Time_Sharing_Option" title="Time Sharing Option">Time Sharing Option</a> (TSO), intended mainly as a "bridge" between CPS and TSO.

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<ul><li><a href="Allen-Babcock" title="Allen-Babcock">Allen-Babcock</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">GYBO-0517 CONVERSATIONAL PROGRAMMING SYSTEM (CPS) VERSION LISTINGS PROGRAM NUMBER 3600-03.4.016</span>

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</style><cite id="CITEREFThielen" class="citation web cs1">Thielen, Ronald J. <a rel="nofollow" class="external text" href="http://home.uchicago.edu/~rthielen/cps.html">"Conversational Programming System"</a>. <i>The University of Chicago</i><span class="reference-accessdate">. Retrieved <span class="nowrap">Dec 29,</span> 2018</span>.</cite></span>

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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><cite id="CITEREFAllen-Babcock,_Inc." class="citation web cs1">Allen-Babcock, Inc. <a rel="nofollow" class="external text" href="http://bitsavers.informatik.uni-stuttgart.de/pdf/allen-babcock/cps/Draft_Eval_Microprogram_Mar66.pdf">"Specification EVAL Microprogram"</a> <span class="cs1-format">(PDF)</span><span class="reference-accessdate">. Retrieved <span class="nowrap">February 18,</span> 2013</span>.</cite></li>

<li><a rel="nofollow" class="external text" href="https://www.computerhistory.org/collections/catalog/102773382">Conversational Programming System (CPS) development at computerhistory.org</a></li></ul>

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