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60-bit computing
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<h2 id="examples">Examples</h2> <p>The only widely-used computers with 60-bit <a href="/facts/Word_(data_type)/2e5umRaj">words</a> were produced by <a href="/facts/Control_Data_Corporation/ChfGgfPM">Control Data Corporation</a> (CDC),<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> including the <a href="/facts/CDC_6000/WDWo1psf">CDC 6000</a> series,<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> the <a href="/facts/CDC_7600/Rgu6spkG">CDC 7600</a>, and the <a href="/facts/CDC_Cyber/04hxKmJw">CDC Cyber 70 and 170 series</a>.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> Though the addressable unit was the 60-bit word, instructions were either 15 or 30 bits.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> </p><p>Early design documents for the <a href="/facts/IBM_7030_Stretch/V8SdUp00">IBM 7030 Stretch</a> tentatively specified its word length as 60 bits; the final design used 64.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> </p> <h2 id="emulator">Emulator</h2> <p>Museum examples of 60-bit CDC machines exist. There also exists an emulator for the series which will simulate the CDC 60-bit machines on commodity hardware and operating systems.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>James L. Peterson, Computer Organization and Assembly Language Programming, 2014, ISBN 1483268594, p. 46 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Peterson; Concise Encyclopedia of Computer Science, 2004 ISBN 0470090952; Linda Null, Julia Lobur, Essentials of Computer Organization and Architecture, 2014, ISBN 1284033155; John Y. Hsu, Computer Architecture: Software Aspects, Coding, and Hardware, 2017, ISBN 1351836048 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"CDC 6000 Hardware". 60bits.net. Central Memory. Archived from the original on 28 February 2019. Retrieved 28 February 2018. <a href="http://60bits.net/msu/mycomp/cdc6000/65hard.htm" target="_blank">http://60bits.net/msu/mycomp/cdc6000/65hard.htm</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Welcome to cray-cyber.org - home of Cray Research and CDC computer". Desktop Cyber. Archived from the original on 28 February 2019. Retrieved 28 February 2018. <a href="https://cray-cyber.org/systems/desktop-cyber/" target="_blank">https://cray-cyber.org/systems/desktop-cyber/</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"CDC 6000 Hardware". 60bits.net. Central Memory. Archived from the original on 28 February 2019. Retrieved 28 February 2018. <a href="http://60bits.net/msu/mycomp/cdc6000/65hard.htm" target="_blank">http://60bits.net/msu/mycomp/cdc6000/65hard.htm</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Werner Buchholz, "Memory Word Length", STRETCH Memo no. 40, July 31, 1956, archived at the Computer History Museum <a href="http://archive.computerhistory.org/resources/text/IBM/Stretch/pdfs/06-08/102632289.pdf" target="_blank">http://archive.computerhistory.org/resources/text/IBM/Stretch/pdfs/06-08/102632289.pdf</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"Welcome to cray-cyber.org - home of Cray Research and CDC computer". Desktop Cyber. Archived from the original on 28 February 2019. Retrieved 28 February 2018. <a href="https://cray-cyber.org/systems/desktop-cyber/" target="_blank">https://cray-cyber.org/systems/desktop-cyber/</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> </ol>