IBM 2365 Processor Storage

<h2 id="models">Models</h2>
<p>The various models are used as follows:
</p>
<ul><li>Model 1 is used on the System/360 model 65 when not used as a multiprocessor.</li>
<li>Model 2 is used on the System/360 models 65 (when not used as a multiprocessor) and 67-1.</li>
<li>Model 3 is used on the System/360 model 75.</li>
<li>Model 5 is used on the System/360 model 85.</li>
<li>Model 12 is used on the System/360 model 67-2.</li>
<li>Model 13 is used on the System/360 model 65 when used as a multiprocessor.</li></ul>
<h2 id="use-with-the-system360-model-85">Use with the System/360 model 85</h2>
<p>The IBM 2365 model 5 is special because the System/360 model 85 accesses memory in  <a href="/facts/128-bit/fo1QpdNj">128-bit</a>  (16 byte) units, unlike the other System/360 models which support the IBM 2365, all of which access <a href="/facts/64-bit_computing/AgvkQHkM">64-bit</a> (8 byte) units.  On the System/360 model 85, the IBM 2365 model 5 operates with a cycle time of 1040 nanoseconds, and two or four of them are required.  Because the System/360 model 85 CPU is so much faster than memory, if there are two IBM 2365 model 5 components they are two-way interleaved, and if there are four IBM 2365 model 5 components they are four-way interleaved.  Because the IBM 2365 model 5 is internally two-way <a href="/facts/Interleaved_memory/UPt7yxW9">interleaved</a>, sequential 128-bit memory operations issued by the System/360 model 85 CPU traverse all the memory components before cycling back to the first.
</p><p>The IBM 2365 model 5 is used only with the System/360 model 85 with 524,288 (512 K) or 1,048,576 bytes (1 MB) of storage.
</p>
<h3>IBM 2385 Processor Storage</h3>
<p>The <a href="/facts/IBM_System/360_Model_85/pVoUUagB">IBM System/360 Model 85</a>, when configured with 2,097,152 (2 MB, 360/85 K85) or 4,194,304 (4 MB, 360/85 L85) bytes, uses the IBM 2385 instead of the IBM 2365 Processor Storage.  The IBM 2385 has a cycle time of 960 <a href="/facts/Nanosecond/gARLTp4c">nanoseconds</a> compared to 1,040 nanoseconds for the IBM 2365 model 5.
</p>

<h2 id="external-links">External links</h2>
<ul><li><a href="http://ed-thelen.org/comp-hist/IBM-ProdAnn/360-85.pdf">IBM System/360 model 85 product announcement</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>IBM (September 1968), IBM System/360 Model 65 Functional Characteristics (PDF), Fourth Edition, A22-6884-3 <a href="http://www.bitsavers.org/pdf/ibm/360/functional_characteristics/A22-6884-3_360-65_funcChar.pdf" target="_blank">http://www.bitsavers.org/pdf/ibm/360/functional_characteristics/A22-6884-3_360-65_funcChar.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>IBM (February 1972), IBM System/360 Model 67 Functional Characteristics (PDF), Third Edition, GA27-2719-2 <a href="http://www.bitsavers.org/pdf/ibm/360/functional_characteristics/GA27-2719-2_360-67_funcChar.pdf" target="_blank">http://www.bitsavers.org/pdf/ibm/360/functional_characteristics/GA27-2719-2_360-67_funcChar.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>IBM, IBM System/360 Model 75 Functional Characteristics (PDF), A22-6889-0 <a href="http://www.bitsavers.org/pdf/ibm/360/functional_characteristics/A22-6889-0_360-75_funcChar.pdf" target="_blank">http://www.bitsavers.org/pdf/ibm/360/functional_characteristics/A22-6889-0_360-75_funcChar.pdf</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>IBM (June 1968), IBM System/360 Model 85 Functional Characteristics (PDF), Second Edition, A22-6916-1 <a href="http://www.bitsavers.org/pdf/ibm/360/functional_characteristics/A22-6916-1_360-85_funcChar_Jun68.pdf" target="_blank">http://www.bitsavers.org/pdf/ibm/360/functional_characteristics/A22-6916-1_360-85_funcChar_Jun68.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
</ol>

IBM 2365 Processor Storage open-in-new

IBM 2365 Processor Storage