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.infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vevent"><caption class="infobox-title summary">Micro-Cap</caption><tbody><tr><td colspan="2" class="infobox-image logo"><span typeof="mw:File"><a href="/wiki/File:Micro-Cap12.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/en/thumb/7/76/Micro-Cap12.JPG/120px-Micro-Cap12.JPG" decoding="async" width="120" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/7/76/Micro-Cap12.JPG/180px-Micro-Cap12.JPG 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/7/76/Micro-Cap12.JPG/240px-Micro-Cap12.JPG 2x" data-file-width="294" data-file-height="293" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Original author(s)</a></th><td class="infobox-data">Andy Thompson, Tim O'Brien, Bill Steele</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Developer(s)</a></th><td class="infobox-data"><a href="/wiki/Spectrum_Software" title="Spectrum Software">Spectrum Software</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Initial release</th><td class="infobox-data">September 1982<span class="noprint">;<br />42 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">1982-09</span>)</span></td></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_release_life_cycle" title="Software release life cycle">Final release</a></th><td class="infobox-data"><div style="margin:0px;">12.2.0.5 / June 17, 2021<span class="noprint">; 3 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">2021-06-17</span>)</span></div></td></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Operating_system" title="Operating system">Operating system</a></th><td class="infobox-data"><a href="/wiki/Microsoft_Windows" title="Microsoft Windows">Windows</a> 2K, XP, Vista, 7, 8, 8.1, 10</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Computing_platform" title="Computing platform">Platform</a></th><td class="infobox-data"><a href="/wiki/IA-32" title="IA-32">IA-32</a>, <a href="/wiki/X86-64" title="X86-64">x86-64</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/File_size" title="File size">Size</a></th><td class="infobox-data">58 MB</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Available in</th><td class="infobox-data">English</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data"><a href="/wiki/Electronic_design_automation" title="Electronic design automation">Electronic design automation</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="/wiki/Freeware" title="Freeware">Freeware</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20230219052113/http://www.spectrum-soft.com/index.shtm">Website archive</a></td></tr></tbody></table> <p><b>Micro-Cap</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> is a <a href="/wiki/SPICE" title="SPICE">SPICE</a> compatible analog/digital circuit simulator with an integrated schematic editor that provides an interactive sketch and simulate environment for electronics engineers. It was developed by <a href="/wiki/Spectrum_Software" title="Spectrum Software">Spectrum Software</a>, and was only available with a paid commercial license.<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> In July 2019, Spectrum Software closed down and Micro-Cap was released as <a href="/wiki/Freeware" title="Freeware">freeware</a>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Software updates and technical support are no longer available. In early 2023, their website went offline, though it was previously backed up at archive.org.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Version_history">Version history</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Micro-Cap&action=edit&section=1" title="Edit section: Version history"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The name Micro-Cap was derived from the term Microcomputer Circuit Analysis Program. The forerunners to the Micro-Cap simulator were the Logic Designer and Simulator. Released in June 1980, this product was the first integrated circuit editor and logic simulation system available for personal computers. Its primary goal was to provide a “circuit creation and simulation” environment for digital simulation. </p><p>In August 1981, the analog equivalent of the first program, Circuit Designer and Simulator, was released. Its integrated text editor created circuit descriptions for a simple, linear, analog simulator. September 1982 saw the release of the first Micro-Cap package as a successor to the Circuit Designer and Simulator. </p> <ul><li>1982 Micro-Cap</li> <li>1984 Micro-Cap 2</li> <li>1988 Micro-Cap 3</li> <li>1992 Micro-Cap 4</li> <li>1995 Micro-Cap 5</li> <li>1997 Micro-Cap 5 2.0</li> <li>1999 Micro-Cap 6</li> <li>2001 Micro-Cap 7</li> <li>2004 Micro-Cap 8</li> <li>2007 Micro-Cap 9</li> <li>2010 Micro-Cap 10</li> <li>2013 Micro-Cap 11</li> <li>2018 Micro-Cap 12 - the final major version</li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Micro-Cap&action=edit&section=2" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Comparison_of_EDA_software" title="Comparison of EDA software">Comparison of EDA software</a></li> <li><a href="/wiki/List_of_free_electronics_circuit_simulators" title="List of free electronics circuit simulators">List of free electronics circuit simulators</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Micro-Cap&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns 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no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFThompson" class="citation web cs1">Thompson, Andy. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20121012013611/http://www.computer.org/portal/web/csdl/doi/10.1109/MCG.1984.276090">"Micro-CAP: An Analog Circuit Design System for Personal Computers"</a>. <i>IEEE Computer Society</i>. IEEE. Archived from <a rel="nofollow" class="external text" href="http://www.computer.org/portal/web/csdl/doi/10.1109/MCG.1984.276090">the original</a> on 2012-10-12<span class="reference-accessdate">. Retrieved <span class="nowrap">2011-08-04</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=IEEE+Computer+Society&rft.atitle=Micro-CAP%3A+An+Analog+Circuit+Design+System+for+Personal+Computers&rft.aulast=Thompson&rft.aufirst=Andy&rft_id=http%3A%2F%2Fwww.computer.org%2Fportal%2Fweb%2Fcsdl%2Fdoi%2F10.1109%2FMCG.1984.276090&rfr_id=info%3Asid%2Fen.wikipedia.org%3AMicro-Cap" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20181108030621/http://www.spectrum-soft.com/price.shtm">"Micro-Cap Price List"</a>. <i>Micro-Cap</i>. Archived from <a rel="nofollow" class="external text" href="http://www.spectrum-soft.com/price.shtm">the original</a> on November 8, 2018.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Micro-Cap&rft.atitle=Micro-Cap+Price+List&rft_id=http%3A%2F%2Fwww.spectrum-soft.com%2Fprice.shtm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AMicro-Cap" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://hackaday.com/2020/01/08/commercial-circuit-simulator-goes-free/">"Commercial Circuit Simulator Goes Free"</a>. <i>Hack-A-Day</i>. January 8, 2020. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20230327075118/https://hackaday.com/2020/01/08/commercial-circuit-simulator-goes-free/">Archived</a> from the original on March 27, 2023.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Hack-A-Day&rft.atitle=Commercial+Circuit+Simulator+Goes+Free&rft.date=2020-01-08&rft_id=https%3A%2F%2Fhackaday.com%2F2020%2F01%2F08%2Fcommercial-circuit-simulator-goes-free%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AMicro-Cap" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20230219052113/http://www.spectrum-soft.com/index.shtm">Final archive of Spectrum Software website; February 19, 2023.</a></span> </li> </ol></div></div> <dl><dt>Notes</dt></dl> <style data-mw-deduplicate="TemplateStyles:r1239549316">.mw-parser-output .refbegin{margin-bottom:0.5em}.mw-parser-output .refbegin-hanging-indents>ul{margin-left:0}.mw-parser-output .refbegin-hanging-indents>ul>li{margin-left:0;padding-left:3.2em;text-indent:-3.2em}.mw-parser-output .refbegin-hanging-indents ul,.mw-parser-output .refbegin-hanging-indents ul li{list-style:none}@media(max-width:720px){.mw-parser-output .refbegin-hanging-indents>ul>li{padding-left:1.6em;text-indent:-1.6em}}.mw-parser-output .refbegin-columns{margin-top:0.3em}.mw-parser-output .refbegin-columns ul{margin-top:0}.mw-parser-output .refbegin-columns li{page-break-inside:avoid;break-inside:avoid-column}@media screen{.mw-parser-output .refbegin{font-size:90%}}</style><div class="refbegin" style=""> <ul><li><a rel="nofollow" class="external text" href="http://electronicdesign.com/embedded/spice-programs-computerized-circuit-analysis-analog-ees">Spice Programs: Computerized Circuit Analysis For Analog EEs</a></li> <li><a rel="nofollow" class="external text" href="http://user.unob.cz/biolek/DF/DFa.htm">Analysis of digital filters via SPICE-family programs</a></li> <li><a rel="nofollow" class="external text" href="http://home.fnal.gov/~kubik/Noise.pdf">Modeling IIj Noise in HEMTS with SPICE-Based Micro-Cap</a></li> <li><a rel="nofollow" class="external text" href="http://user.unob.cz/biolek/veda/articles/CSCC07.pdf">AC Analysis of Idealized Switched-Capacitor Circuits in Spice-Compatible Programs</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20100928040701/http://www.russandrews.com/downloads/ZapperatorDocJA4.pdf">White Paper: A New Zobel Network for Audio</a></li> <li><a rel="nofollow" class="external text" href="https://archive.today/20130103161801/http://www.edn.com/article/481000-Get_more_power_with_a_boosted_triode.php">Get more power with a boosted triode</a></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Micro-Cap&action=edit&section=4" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20230219052113/http://www.spectrum-soft.com/index.shtm">Archive of Micro-Cap website</a> at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> (archived February 19, 2023)</li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20230214034946/http://www.spectrum-soft.com/download/download.shtm">Download Micro-Cap</a>, archived</li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20230309075525/http://www.spectrum-soft.com/download/mc12_brochure.pdf">Micro-Cap Brochure</a>, archived</li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20230106104609/http://www.spectrum-soft.com/news.shtm">Micro-Cap Application Notes</a>, archived</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist 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software)">Allegro</a> (<i><a href="/wiki/OrCAD" title="OrCAD">OrCAD</a></i>)</li> <li><a href="/wiki/Altium_Designer" title="Altium Designer">Altium Designer</a> (<i><a href="/wiki/Altium#History" title="Altium">Protel</a></i> (<i><a href="/wiki/Autotrax" title="Autotrax">Autotrax</a></i> (<i>Easytrax</i>, <i>Tango PCB</i>)), <i><a href="/wiki/P-CAD" title="P-CAD">P-CAD</a></i>)</li> <li><a href="/wiki/AutoCAD" title="AutoCAD">AutoCAD</a> Electrical</li> <li><a href="/wiki/Mentor_Graphics" title="Mentor Graphics">BoardStation, IntegraStation, PADS, Xpedition</a></li> <li><a href="/wiki/CADSTAR" title="CADSTAR">CADSTAR</a></li> <li><a href="/wiki/CircuitMaker" title="CircuitMaker">CircuitMaker</a></li> <li><a href="/wiki/Zuken" title="Zuken">CR-2000, CR-3000</a>, <a href="/wiki/CR-5000" title="CR-5000">CR-5000</a>, <a href="/wiki/CR-8000" title="CR-8000">CR-8000</a></li> <li><a href="/wiki/DesignSpark_PCB" title="DesignSpark PCB">DesignSpark PCB</a></li> <li><a href="/wiki/DipTrace" title="DipTrace">DipTrace</a></li> <li><a href="/wiki/EAGLE_(program)" title="EAGLE (program)">EAGLE</a></li> <li><a href="/wiki/EasyEDA" title="EasyEDA">EasyEDA</a></li> <li><a href="/wiki/LTspice" title="LTspice">LTspice</a></li> <li><i><a class="mw-selflink selflink">Micro-Cap</a></i></li> <li><a href="/wiki/NI_Multisim" title="NI Multisim">Multisim</a></li> <li><a href="/wiki/PCB_(software)" title="PCB (software)">PCB</a></li> <li><a href="/wiki/Proteus_Design_Suite" title="Proteus Design Suite">Proteus</a></li> <li><a href="/wiki/Pulsonix" title="Pulsonix">Pulsonix</a></li> <li><a href="/wiki/SolidWorks" title="SolidWorks">SolidWorks</a> Electrical</li> <li><a href="/wiki/TARGET_(CAD_software)" title="TARGET (CAD software)">TARGET</a></li> <li><a href="/wiki/TopoR" title="TopoR">TopoR</a> (<a href="/wiki/TopoR#Features" title="TopoR">Delta Design</a>, <i><a href="/wiki/TopoR#History" title="TopoR">FreeStyle</a></i>)</li> <li><a href="/wiki/NI_Ultiboard" title="NI Ultiboard">Ultiboard</a></li> <li><a href="/wiki/Upverter" title="Upverter">Upverter</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/File_format" title="File format">File formats</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/3D_Manufacturing_Format" title="3D Manufacturing Format">3MF</a></li> <li><a href="/wiki/ACIS#File_format" title="ACIS">ACIS</a></li> <li><a href="/wiki/Additive_manufacturing_file_format" title="Additive manufacturing file format">AMF</a></li> <li><a href="/wiki/C3D_Toolkit" title="C3D Toolkit">C3D</a></li> <li><a href="/wiki/KeyCreator" title="KeyCreator">CKD</a></li> <li><a href="/wiki/Specctra" title="Specctra">DSN</a></li> <li><a href="/wiki/Design_Web_Format" title="Design Web Format">DWF</a></li> <li><a href="/wiki/Open_Packaging_Conventions" title="Open Packaging Conventions">DWFX</a></li> <li><a href="/wiki/.dwg" title=".dwg">DWG</a></li> <li><a href="/wiki/AutoCAD_DXF" title="AutoCAD DXF">DXF</a></li> <li><a href="/wiki/IGES" title="IGES">IGES</a></li> <li><a href="/wiki/Wavefront_.obj_file" title="Wavefront .obj file">OBJ</a></li> <li><a href="/wiki/Open_Design_Alliance" title="Open Design Alliance">OpenDWG</a></li> <li><a href="/wiki/PLY_(file_format)" title="PLY (file format)">PLY</a></li> <li><a href="/wiki/OrCAD#OrCAD_PSpice" title="OrCAD">PSpice</a></li> <li><a href="/wiki/Specctra" title="Specctra">SES</a></li> <li><a href="/wiki/ISO_10303" title="ISO 10303">STEP</a></li> <li><a href="/wiki/STL_(file_format)" title="STL (file format)">STL</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Geometric_modeling_kernel" title="Geometric modeling kernel">Modeling<br />kernels</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ACIS" title="ACIS">ACIS</a></li> <li><a href="/wiki/C3D_Toolkit" title="C3D Toolkit">C3D</a></li> <li><a href="/wiki/Digital_Geometric_Kernel" title="Digital Geometric Kernel">Digital Geometric Kernel</a> (<i>KernelCAD</i>)</li> <li><a href="/wiki/IntelliCAD" title="IntelliCAD">IntelliCAD</a></li> <li><a href="/wiki/Open_Cascade_Technology" title="Open Cascade Technology">Open Cascade Technology</a></li> <li><a href="/wiki/Open_Design_Alliance" title="Open Design Alliance">Open Design Alliance</a> (<i>Teigha</i>)</li> <li><a href="/wiki/Romulus_(modelling_kernel)" title="Romulus (modelling kernel)">Romulus</a> (<a href="/wiki/Parasolid" title="Parasolid">Parasolid</a>)</li> <li><a href="/wiki/Russian_Geometric_Kernel" title="Russian Geometric Kernel">RGK</a></li> <li><a href="/wiki/ShapeManager" title="ShapeManager">ShapeManager</a></li> <li><a href="/wiki/Solid_Modeling_Solutions" title="Solid Modeling Solutions">SMLib</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Historic</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/DAC-1" title="DAC-1">DAC-1</a></i> (1963)</li> <li><i><a href="/wiki/Sketchpad" title="Sketchpad">Sketchpad</a></i> (1963)</li> <li><a href="/wiki/UNISURF" title="UNISURF">UNISURF</a> (1968)</li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><i>Italics</i> <b>= discontinued</b><br /><a href="/wiki/Computer-aided_industrial_design" title="Computer-aided industrial design">Computer-aided industrial design</a> • <a href="/wiki/Comparison_of_computer-aided_design_software" title="Comparison of computer-aided design software">Comparison</a> • <a href="/wiki/History_of_CAD_software" title="History of CAD software">History</a></div></td></tr></tbody></table></div>    </div><noscript><img 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