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id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .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"><caption class="infobox-title">UMC Green CPU</caption><tbody><tr><td colspan="2" class="infobox-image"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:UMC_Green_CPU_486_40_MHz.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/UMC_Green_CPU_486_40_MHz.jpg/220px-UMC_Green_CPU_486_40_MHz.jpg" decoding="async" width="220" height="214" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/UMC_Green_CPU_486_40_MHz.jpg/330px-UMC_Green_CPU_486_40_MHz.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/73/UMC_Green_CPU_486_40_MHz.jpg/440px-UMC_Green_CPU_486_40_MHz.jpg 2x" data-file-width="530" data-file-height="516" /></a></span><div class="infobox-caption">A UMC U5SD microprocessor rated for 40 MHz motherboards.</div></td></tr><tr><th colspan="2" class="infobox-header">General information</th></tr><tr><th scope="row" class="infobox-label">Launched</th><td class="infobox-data">ca. 1990s</td></tr><tr><th scope="row" class="infobox-label">Common manufacturer</th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li><a href="/wiki/United_Microelectronics_Corporation" title="United Microelectronics Corporation">UMC</a></li></ul></div></td></tr><tr><th colspan="2" class="infobox-header">Performance</th></tr><tr><th scope="row" class="infobox-label">Max. <a href="/wiki/Central_processing_unit" title="Central processing unit">CPU</a> <a href="/wiki/Clock_rate" title="Clock rate">clock rate</a></th><td class="infobox-data">33 MHz to 40 MHz</td></tr><tr><th scope="row" class="infobox-label">Data width</th><td class="infobox-data">32 bits<sup id="cite_ref-486ref_1-0" class="reference"><a href="#cite_note-486ref-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label">Address width</th><td class="infobox-data">32 bits<sup id="cite_ref-486ref_1-1" class="reference"><a href="#cite_note-486ref-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label">Virtual address width</th><td class="infobox-data">32 bits (linear); 46 bits (logical)<sup id="cite_ref-486ref_1-2" class="reference"><a href="#cite_note-486ref-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th colspan="2" class="infobox-header">Architecture and classification</th></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Technology_node" class="mw-redirect" title="Technology node">Technology node</a></th><td class="infobox-data">0.6 μm to 0.35 μm</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Instruction_set_architecture" title="Instruction set architecture">Instruction set</a></th><td class="infobox-data"><a href="/wiki/X86-16" class="mw-redirect" title="X86-16">x86-16</a>, <a href="/wiki/IA-32" title="IA-32">IA-32</a> including <a href="/wiki/X87" title="X87">x87</a> (except for U5SD)</td></tr><tr><th colspan="2" class="infobox-header">Physical specifications</th></tr><tr><th scope="row" class="infobox-label">Package</th><td class="infobox-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409" /><div class="plainlist"><ul><li><a href="/wiki/Pin_grid_array" title="Pin grid array">PGA</a> (<a href="/wiki/Socket_1" title="Socket 1">socket 1</a>, <a href="/wiki/Socket_2" title="Socket 2">2</a>, <a href="/wiki/Socket_3" title="Socket 3">3</a>), 196-pin <a href="/wiki/PQFP" class="mw-redirect" title="PQFP">PQFP</a>, 208-pin <a href="/wiki/SQFP" class="mw-redirect" title="SQFP">SQFP</a></li></ul></div></td></tr></tbody></table> <p>The <b>UMC Green CPU</b> was an <a href="/wiki/X86" title="X86">x86</a>-compatible <a href="/wiki/Microprocessor" title="Microprocessor">microprocessor</a> produced by <a href="/wiki/United_Microelectronics_Corporation" title="United Microelectronics Corporation">UMC</a>, a Taiwanese semiconductor company, in the early- to mid-1990s. It was offered as an alternative to the <a href="/wiki/Intel_80486" class="mw-redirect" title="Intel 80486">Intel 80486</a> with which it was <a href="/wiki/Pin_compatibility" title="Pin compatibility">pin compatible</a>, enabling it to be installed in most 80486 <a href="/wiki/Motherboard" title="Motherboard">motherboards</a>. All models had power management features intended to reduce electricity consumption. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Models_produced">Models produced</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UMC_Green_CPU&action=edit&section=1" title="Edit section: Models produced"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The UMC Green CPU was available with different features, physical characteristics and clock speeds.<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> Some of which were only sold in limited quantities. </p> <div class="mw-heading mw-heading3"><h3 id="Available_models">Available models</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UMC_Green_CPU&action=edit&section=2" title="Edit section: Available models"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>All models feature an 8 KB <a href="/wiki/Processor_cache" class="mw-redirect" title="Processor cache">level 1 cache</a> and operate at clock speeds of 25 MHz, 33 MHz, or 40 MHz. </p> <table class="wikitable"> <tbody><tr> <th>Model</th> <th><a href="/wiki/Floating-point_unit" title="Floating-point unit">FPU</a></th> <th><a href="/wiki/IC_package" class="mw-redirect" title="IC package">Package</a></th> <th>Voltage</th> <th>Notes </th></tr> <tr> <td>U5S</td> <td>No</td> <td rowspan="2"><a href="/wiki/Ceramic_pin_grid_array" class="mw-redirect" title="Ceramic pin grid array">CPGA</a></td> <td rowspan="5">5.0 V</td> <td>Compatible with the <a href="/wiki/486SX" class="mw-redirect" title="486SX">486SX</a>. </td></tr> <tr> <td>U5D</td> <td>Yes</td> <td>Compatible with the <a href="/wiki/486DX" class="mw-redirect" title="486DX">486DX</a>, very few were produced. </td></tr> <tr> <td>U5SX</td> <td rowspan="5">No</td> <td>CPGA, <a href="/wiki/PPGA" class="mw-redirect" title="PPGA">PPGA</a>, <a href="/wiki/PQFP" class="mw-redirect" title="PQFP">PQFP</a></td> <td>Identical to the U5S, the QFP version was available as an embedded solution or attached to a PGA adapter. </td></tr> <tr> <td>U5SD</td> <td>CPGA</td> <td>Few were produced. Functionally identical to U5S and U5SX but with 486DX <a href="/wiki/Pinout" title="Pinout">pinout</a>. </td></tr> <tr> <td>U5SF</td> <td rowspan="3">PQFP</td> <td>Plastic Package, an embedded solution for smaller computers. </td></tr> <tr> <td>U5SLV</td> <td rowspan="2">3.3 V</td> <td>Low-voltage version </td></tr> <tr> <td>U5FLV</td> <td>Low-voltage version, often embedded on the motherboard. </td></tr></tbody></table> <p>Functionally all models except U5D are identical and only differed in their intended application, voltage rating or physical packaging. The U5SD does not contain a floating point unit and is indistinguishable from other U5S chips in operation, though it is unusual because it features a 486DX pinout<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> as opposed to the more common 486SX pinout versions. This would allow installation into certain older motherboards which may have had upgrade sockets hardwired to fit only 486DX chips. </p> <div class="mw-heading mw-heading3"><h3 id="Production_and_fabrication">Production and fabrication</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UMC_Green_CPU&action=edit&section=3" title="Edit section: Production and fabrication"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As one of the largest chip foundry owners in Taiwan, UMC owns several fabrication plants which allowed them to fabricate their own designs, whereas some other manufacturers, notably <a href="/wiki/Cyrix" title="Cyrix">Cyrix</a>, had to contract this process out to third parties such as <a href="/wiki/IBM" title="IBM">IBM</a> and <a href="/wiki/Texas_Instruments" title="Texas Instruments">Texas Instruments</a>. All available models of Green CPU were produced on a 0.6 <a href="/wiki/Micrometre" title="Micrometre">μm</a> <a href="/wiki/CMOS" title="CMOS">CMOS</a> <a href="/wiki/600_nm_process" title="600 nm process">process</a>.<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> The chips were available in both plastic and ceramic packages for different applications. The majority of PQFP variants were sold to motherboard manufacturers as a low-cost embedded solution. </p> <div class="mw-heading mw-heading2"><h2 id="Performance">Performance</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UMC_Green_CPU&action=edit&section=4" title="Edit section: Performance"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:UMC_U5S_die.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/UMC_U5S_die.JPG/220px-UMC_U5S_die.JPG" decoding="async" width="220" height="178" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/UMC_U5S_die.JPG/330px-UMC_U5S_die.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e7/UMC_U5S_die.JPG/440px-UMC_U5S_die.JPG 2x" data-file-width="3893" data-file-height="3158" /></a><figcaption><a href="/wiki/Die_(integrated_circuit)" title="Die (integrated circuit)">Die</a> shot of a UMC U5S microprocessor.</figcaption></figure> <p>The UMC U5 Series design was focused on microcode optimizations. An equivalently clocked Intel or AMD processor required 40 cycles to perform an <a href="/wiki/Integer_division" class="mw-redirect" title="Integer division">integer division</a> whereas the UMC processors required only 7, allowing the instruction to complete significantly faster. Performance is generally observed to be higher than competing processors on a clock-for-clock basis; The 40 MHz U5S model being comparable to an AMD Am486SX2 at 66 MHz with correctly configured motherboards.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>Due to an error in the <a href="/wiki/Microcode" title="Microcode">microcode</a>, <a href="/wiki/Windows_98#Windows_98_Second_Edition" title="Windows 98">Microsoft Windows 98 Second Edition</a> identifies some processors as an <a href="/wiki/Intel_P5#P55C" class="mw-redirect" title="Intel P5">Intel Pentium MMX</a> which could cause the operating system and software running within it to crash or exhibit undefined behavior. </p> <div class="mw-heading mw-heading2"><h2 id="Clock_doubling_version">Clock doubling version</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UMC_Green_CPU&action=edit&section=5" title="Edit section: Clock doubling version"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>UMC produced a small quantity of clock doubling processors labeled as the U486DX2. These processors were designed to compete with other clock doubling solutions such as the <a href="/wiki/Intel_80486DX2" class="mw-redirect" title="Intel 80486DX2">Intel 80486DX2</a>, <a href="/wiki/Am486" title="Am486">AMD Am486DX2</a> and <a href="/wiki/Cyrix_Cx486#Cx486DX2" title="Cyrix Cx486">Cyrix Cx486DX2</a>, but due to ongoing legal troubles UMC withdrew the U486DX2 from production. The processor was only ever produced as an engineering sample and never made it to market,<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> it was manufactured with a 0.35 μm CMOS process and is contained within a ceramic package.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Legal_dispute">Legal dispute</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UMC_Green_CPU&action=edit&section=6" title="Edit section: Legal dispute"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In 1994, Intel alleged that UMC had infringed upon its patent for the 80486 microprocessor and filed complaints against UMC and its distributors.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> UMC countered the claims with an anti-trust suit and the case was eventually settled out of court with UMC withdrawing their product and ceasing production of 80486-compatible microprocessors. </p><p>As a result of the dispute, all processors were prohibited from sale within the United States and were visibly labelled as such. Placement of this label varies, the ceramic U5S and U5D models typically display "Not for U.S. sale or import" as part of the silkscreen on the top of the chip where the U5SX and U5SD models usually had "NOT FOR U.S. SALE" printed onto the golden die cover on the underside of the package. This labelling is often absent from plastic packages. </p> <div class="mw-heading mw-heading2"><h2 id="Gallery">Gallery</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UMC_Green_CPU&action=edit&section=7" title="Edit section: Gallery"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 185px"> <div class="thumb" style="width: 180px; height: 210px;"><span typeof="mw:File"><a href="/wiki/File:Not_for_US_sale_labeled_UMC_Green_CPU.jpg" class="mw-file-description" title="A UMC Green CPU. Label "Not for U.S. sale" is printed backside. Model U5SD, 486, 33Mhz."><img alt="A UMC Green CPU. Label "Not for U.S. sale" is printed backside. Model U5SD, 486, 33Mhz." src="//upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Not_for_US_sale_labeled_UMC_Green_CPU.jpg/135px-Not_for_US_sale_labeled_UMC_Green_CPU.jpg" decoding="async" width="135" height="180" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Not_for_US_sale_labeled_UMC_Green_CPU.jpg/202px-Not_for_US_sale_labeled_UMC_Green_CPU.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Not_for_US_sale_labeled_UMC_Green_CPU.jpg/270px-Not_for_US_sale_labeled_UMC_Green_CPU.jpg 2x" data-file-width="864" data-file-height="1152" /></a></span></div> <div class="gallerytext">A UMC Green CPU. Label "Not for U.S. sale" is printed backside. Model U5SD, 486, 33Mhz.</div> </li> <li class="gallerybox" style="width: 185px"> <div class="thumb" style="width: 180px; height: 210px;"><span typeof="mw:File"><a href="/wiki/File:UMC_Green_CPU_408-33.jpg" class="mw-file-description" title="A UMC Green CPU, U5SD 486 33Mhz. 1993. Note the Microsoft Windows compatible logo, corresponding to Windows prior to Windows 95 (Windows 3.11 as year 1993 printed on top)."><img alt="A UMC Green CPU, U5SD 486 33Mhz. 1993. Note the Microsoft Windows compatible logo, corresponding to Windows prior to Windows 95 (Windows 3.11 as year 1993 printed on top)." src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/UMC_Green_CPU_408-33.jpg/135px-UMC_Green_CPU_408-33.jpg" decoding="async" width="135" height="180" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/UMC_Green_CPU_408-33.jpg/202px-UMC_Green_CPU_408-33.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/UMC_Green_CPU_408-33.jpg/270px-UMC_Green_CPU_408-33.jpg 2x" data-file-width="864" data-file-height="1152" /></a></span></div> <div class="gallerytext">A UMC Green CPU, U5SD 486 33Mhz. 1993. Note the Microsoft Windows compatible logo, corresponding to Windows prior to <a href="/wiki/Windows_95" title="Windows 95">Windows 95</a> (<a href="/wiki/Windows_3.11" class="mw-redirect" title="Windows 3.11">Windows 3.11</a> as year 1993 printed on top).</div> </li> <li class="gallerybox" style="width: 185px"> <div class="thumb" style="width: 180px; height: 210px;"><span typeof="mw:File"><a href="/wiki/File:UMC_U5S_Super33.jpg" class="mw-file-description" title="A UMC U5S rated for 33 MHz with "Not for U.S. sale or import" on its silkscreen."><img alt="A UMC U5S rated for 33 MHz with "Not for U.S. sale or import" on its silkscreen." src="//upload.wikimedia.org/wikipedia/commons/thumb/7/75/UMC_U5S_Super33.jpg/150px-UMC_U5S_Super33.jpg" decoding="async" width="150" height="151" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/75/UMC_U5S_Super33.jpg/225px-UMC_U5S_Super33.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/75/UMC_U5S_Super33.jpg/300px-UMC_U5S_Super33.jpg 2x" data-file-width="1314" data-file-height="1320" /></a></span></div> <div class="gallerytext">A UMC U5S rated for 33 MHz with "Not for U.S. sale or import" on its silkscreen.</div> </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=UMC_Green_CPU&action=edit&section=8" 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 li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-486ref-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-486ref_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-486ref_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-486ref_1-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px 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="CITEREFIntel1997" class="citation book cs1">Intel (July 1997). <i>Embedded Intel486 Processor Hardware Reference Manual (273025-001)</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Embedded+Intel486+Processor+Hardware+Reference+Manual+%28273025-001%29&rft.date=1997-07&rft.au=Intel&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUMC+Green+CPU" 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"><a rel="nofollow" class="external free" href="http://www.cpu-world.com/CPUs/80486/MANUF-UMC.html">http://www.cpu-world.com/CPUs/80486/MANUF-UMC.html</a> A page which documents several versions of the UMC Green CPU.</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="http://datasheets.chipdb.org/UMC/U5S.txt">"Text file with information from the <i>1994-1995 UMC Data Book</i>"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Text+file+with+information+from+the+1994-1995+UMC+Data+Book&rft_id=http%3A%2F%2Fdatasheets.chipdb.org%2FUMC%2FU5S.txt&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUMC+Green+CPU" 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 free" href="http://www.opennet.ru/docs/FAQ/hardware/chiplist-part3.html">http://www.opennet.ru/docs/FAQ/hardware/chiplist-part3.html</a> Web page documenting several processors and their fabrication.</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external free" href="https://docs.google.com/spreadsheet/ccc?key=0Aigi3Xn2U-_vdGtKeFpIU2pKWTl2N0J6UFh6Z0E2TWc&usp=sharing#gid=0">https://docs.google.com/spreadsheet/ccc?key=0Aigi3Xn2U-_vdGtKeFpIU2pKWTl2N0J6UFh6Z0E2TWc&usp=sharing#gid=0</a> Benchmark showing various processors, including the U5S and U5SX.</span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external free" href="http://www.cpu-museo.it/486umc.html">http://www.cpu-museo.it/486umc.html</a> Web page documenting the U486DX2 version of this CPU.</span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external free" href="https://translate.google.com/translate?hl=en&sl=ru&u=http://www.phantom.sannata.ru/forum/index.php%3Ft%3D13090%26a%3Ddo_print&prev=/search%3Fq%3DUMC%2BU5S%2B0.6%2Bmicron%26client%3Dfirefox-a%26hs%3DVei%26rls%3Dorg.mozilla:en-US:official%26channel%3Dsb">https://translate.google.com/translate?hl=en&sl=ru&u=http://www.phantom.sannata.ru/forum/index.php%3Ft%3D13090%26a%3Ddo_print&prev=/search%3Fq%3DUMC%2BU5S%2B0.6%2Bmicron%26client%3Dfirefox-a%26hs%3DVei%26rls%3Dorg.mozilla:en-US:official%26channel%3Dsb</a> Page talking about various UMC Green CPU models which notes the Micron process of the U486DX2.</span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external free" href="http://www.cpushack.com/2012/09/06/intel-vs-the-world-the-338-patent/">http://www.cpushack.com/2012/09/06/intel-vs-the-world-the-338-patent/</a> An article which talks about the Intel VS. UMC case.</span> </li> </ol></div></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=UMC_Green_CPU&oldid=1221880411">https://en.wikipedia.org/w/index.php?title=UMC_Green_CPU&oldid=1221880411</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:X86_microprocessors" title="Category:X86 microprocessors">X86 microprocessors</a></li><li><a href="/wiki/Category:Computer-related_introductions_in_1993" title="Category:Computer-related introductions in 1993">Computer-related introductions in 1993</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 2 May 2024, at 15:00<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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