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Available in 11 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-11" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">11 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Real-Time_Operating_System_for_Multiprocessor_Systems" title="Real-Time Operating System for Multiprocessor Systems – German" lang="de" hreflang="de" data-title="Real-Time Operating System for Multiprocessor Systems" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/RTEMS" title="RTEMS – Spanish" lang="es" hreflang="es" data-title="RTEMS" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/RTEMS" title="RTEMS – French" lang="fr" hreflang="fr" data-title="RTEMS" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/RTEMS" title="RTEMS – Korean" lang="ko" hreflang="ko" data-title="RTEMS" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/RTEMS" title="RTEMS – Italian" lang="it" hreflang="it" data-title="RTEMS" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/RTEMS" title="RTEMS – Japanese" lang="ja" hreflang="ja" data-title="RTEMS" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/RTEMS" title="RTEMS – Polish" lang="pl" hreflang="pl" data-title="RTEMS" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/RTEMS" title="RTEMS – Portuguese" lang="pt" hreflang="pt" data-title="RTEMS" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/RTEMS" title="RTEMS – Russian" lang="ru" hreflang="ru" data-title="RTEMS" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/RTEMS" title="RTEMS – Ukrainian" lang="uk" hreflang="uk" data-title="RTEMS" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/RTEMS" title="RTEMS – Chinese" lang="zh" hreflang="zh" data-title="RTEMS" data-language-autonym="中文" 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searchaux" style="display:none">Real-time operating system</div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid 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src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/RTEMS" title="Special:EditPage/RTEMS">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22RTEMS%22">"RTEMS"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22RTEMS%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22RTEMS%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22RTEMS%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22RTEMS%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22RTEMS%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">May 2014</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Operating system</div> <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 vevent"><caption class="infobox-title summary">RTEMS</caption><tbody><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"><a href="/wiki/File:RTEMS_logo.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/11/RTEMS_logo.svg/250px-RTEMS_logo.svg.png" decoding="async" width="250" height="129" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/11/RTEMS_logo.svg/375px-RTEMS_logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/11/RTEMS_logo.svg/500px-RTEMS_logo.svg.png 2x" data-file-width="482" data-file-height="248" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Developer</a></th><td class="infobox-data">OAR Corporation</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programming_language" title="Programming language">Written in</a></th><td class="infobox-data"><a href="/wiki/Ada_(programming_language)" title="Ada (programming language)">Ada</a>, <a href="/wiki/C_(programming_language)" title="C (programming language)">C</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">OS family</th><td class="infobox-data"><a href="/wiki/Real-time_operating_system" title="Real-time operating system">Real-time operating system</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Working state</th><td class="infobox-data">Current</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Source model</th><td class="infobox-data"><a href="/wiki/Open-source_software" title="Open-source software">Open source</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Initial release</th><td class="infobox-data">1993<span class="noprint">; 31 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">1993</span>)</span></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">Latest release</a></th><td class="infobox-data">5.3 / February 10, 2023<span class="noprint">; 21 months ago</span><span style="display:none"> (<span class="bday dtstart published updated">2023-02-10</span>)</span><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></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Repository_(version_control)" title="Repository (version control)">Repository</a></th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="http://git.rtems.org">git<wbr />.rtems<wbr />.org</a></span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Marketing target</th><td class="infobox-data"><a href="/wiki/Embedded_system" title="Embedded system">Embedded systems</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Natural_language" title="Natural language">Available in</a></th><td class="infobox-data">English</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Platforms</th><td class="infobox-data"><a href="/wiki/ARM_architecture" class="mw-redirect" title="ARM architecture">ARM</a>, <a href="/wiki/Blackfin" title="Blackfin">Blackfin</a>, <a href="/wiki/NXP_ColdFire" title="NXP ColdFire">ColdFire</a>, <a href="/wiki/Texas_Instruments" title="Texas Instruments">TI</a> <a href="/wiki/Texas_Instruments_TMS320" class="mw-redirect" title="Texas Instruments TMS320">C3x/C4x</a>, <a href="/wiki/H8_Family" title="H8 Family">H8/300</a>, <a href="/wiki/X86" title="X86">x86</a>, <a href="/wiki/Motorola_68000_series" title="Motorola 68000 series">68k</a>, <a href="/wiki/LatticeMico32" title="LatticeMico32">LatticeMico32</a>, <a href="/wiki/MIPS_architecture" title="MIPS architecture">MIPS</a> (<a href="/wiki/Mongoose-V" title="Mongoose-V">Mongoose-V</a>), <a href="/wiki/Nios_II" title="Nios II">Nios II</a>, <a href="/wiki/OpenRISC" title="OpenRISC">OpenRISC</a>, <a href="/wiki/PowerPC" title="PowerPC">PowerPC</a>, <a href="/wiki/SuperH" title="SuperH">SuperH</a>, <a href="/wiki/SPARC" title="SPARC">SPARC</a> (<a href="/wiki/ERC32" title="ERC32">ERC32</a>, <a href="/wiki/LEON" title="LEON">LEON</a>)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Kernel_(operating_system)" title="Kernel (operating system)">Kernel</a> type</th><td class="infobox-data"><a href="/wiki/Real-time_operating_system" title="Real-time operating system">Real-time</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/User_interface" title="User interface">Default<br />user interface</a></th><td class="infobox-data"><a href="/wiki/Command-line_interface" title="Command-line interface">Command-line</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">Modified <a href="/wiki/GNU_General_Public_License" title="GNU General Public License">GPL</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Official website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="http://www.rtems.org">www<wbr />.rtems<wbr />.org</a></span></td></tr></tbody></table> <p><b>Real-Time Executive for Multiprocessor Systems</b> (<b>RTEMS</b>), formerly <b>Real-Time Executive for Missile Systems</b>, and then <b>Real-Time Executive for Military Systems</b>, is a <a href="/wiki/Real-time_operating_system" title="Real-time operating system">real-time operating system</a> (RTOS) designed for <a href="/wiki/Embedded_system" title="Embedded system">embedded systems</a>. It is <a href="/wiki/Free_and_open-source_software" title="Free and open-source software">free and open-source software</a>. </p><p>Development began in the late 1980s with early versions available via <a href="/wiki/File_Transfer_Protocol" title="File Transfer Protocol">File Transfer Protocol</a> (ftp) as early as 1993. OAR Corporation is currently managing the RTEMS project in cooperation with a steering committee which includes user representatives. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Design">Design</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=RTEMS&action=edit&section=1" title="Edit section: Design"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>RTEMS is designed for real-time, embedded systems and to support various open application programming interface (<a href="/wiki/API" title="API">API</a>) standards including Portable Operating System Interface (<a href="/wiki/POSIX" title="POSIX">POSIX</a>) and <a href="/wiki/ITRON_project" title="ITRON project">μITRON</a>. The API now known as the Classic RTEMS API was originally based on the Real-Time Executive Interface Definition (RTEID) specification. RTEMS includes a <a href="/wiki/Porting" title="Porting">port</a> of the <a href="/wiki/FreeBSD" title="FreeBSD">FreeBSD</a> <a href="/wiki/Internet_protocol_suite" title="Internet protocol suite">Internet protocol suite</a> (TCP/IP stack) and support for various <a href="/wiki/File_system" title="File system">file systems</a> including <a href="/wiki/Network_File_System" title="Network File System">Network File System</a> (NFS) and <a href="/wiki/File_Allocation_Table" title="File Allocation Table">File Allocation Table</a> (FAT). </p><p>RTEMS provides extensive <a rel="nofollow" class="external text" href="https://docs.rtems.org/branches/master/c-user/multiprocessing.html">multi-processing</a> and <a rel="nofollow" class="external text" href="https://docs.rtems.org/branches/master/posix-users/memory_managment.html">memory-management services</a>, and even a <a rel="nofollow" class="external text" href="https://docs.rtems.org/branches/master/posix-users/system_database.html">System-database</a> alongside many other facilities. It has <a rel="nofollow" class="external text" href="https://docs.rtems.org/">extensive documentation</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Architectures">Architectures</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=RTEMS&action=edit&section=2" title="Edit section: Architectures"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>RTEMS has been ported to various target processor architectures: </p> <ul><li><a href="/wiki/ARM_architecture_family#32-bit_architecture" title="ARM architecture family">ARM</a></li> <li><a href="/wiki/AArch64" title="AArch64">AArch64</a></li> <li><a href="/wiki/Atmel_AVR" class="mw-redirect" title="Atmel AVR">Atmel AVR</a></li> <li><a href="/wiki/Blackfin" title="Blackfin">Blackfin</a></li> <li>Freescale, now <a href="/wiki/NXP_ColdFire" title="NXP ColdFire">NXP ColdFire</a></li> <li><a href="/wiki/Texas_Instruments" title="Texas Instruments">Texas Instruments</a> – <a href="/wiki/Texas_Instruments_TMS320" class="mw-redirect" title="Texas Instruments TMS320">C3x/C4x</a> DSPs</li> <li>Intel – <a href="/wiki/X86" title="X86">x86</a> architecture members <a href="/wiki/Intel_80386" class="mw-redirect" title="Intel 80386">80386</a>, <a href="/wiki/Pentium" title="Pentium">Pentium</a>, and above</li> <li><a href="/wiki/LatticeMico32" title="LatticeMico32">LatticeMico32</a></li> <li><a href="/wiki/Microblaze" class="mw-redirect" title="Microblaze">Microblaze</a></li> <li><a href="/wiki/Motorola_68000_series" title="Motorola 68000 series">68k</a></li> <li><a href="/wiki/MIPS_architecture" title="MIPS architecture">MIPS</a></li> <li><a href="/wiki/Nios_II" title="Nios II">Nios II</a></li> <li><a href="/wiki/OpenRISC" title="OpenRISC">OpenRISC</a></li> <li><a href="/wiki/PowerPC" title="PowerPC">PowerPC</a></li> <li><a href="/wiki/Renesas_Electronics" title="Renesas Electronics">Renesas</a> – <a href="/wiki/H8_Family" title="H8 Family">H8/300</a>, M32C, <a href="/wiki/M32R" title="M32R">M32R</a>, <a href="/wiki/SuperH" title="SuperH">SuperH</a></li> <li><a href="/wiki/RISC-V" title="RISC-V">RISC-V</a> RV32, RV64 using <a href="/wiki/QEMU" title="QEMU">QEMU</a></li> <li><a href="/wiki/SPARC" title="SPARC">SPARC</a> – <a href="/wiki/ERC32" title="ERC32">ERC32</a>, <a href="/wiki/LEON" title="LEON">LEON</a>, <a href="/wiki/SPARC_V9" class="mw-redirect" title="SPARC V9">V9</a></li> <li><a href="/wiki/V850" title="V850">V850</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Uses">Uses</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=RTEMS&action=edit&section=3" title="Edit section: Uses"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>RTEMS is used in many application domains. The Experimental Physics and Industrial Control System (<a href="/wiki/EPICS" title="EPICS">EPICS</a>) community includes multiple people who are active RTEMS submitters. RTEMS is also popular for space uses since it supports multiple microprocessors developed for use in space including <a href="/wiki/SPARC" title="SPARC">SPARC</a> <a href="/wiki/ERC32" title="ERC32">ERC32</a> and <a href="/wiki/LEON" title="LEON">LEON</a>, <a href="/wiki/MIPS_architecture" title="MIPS architecture">MIPS</a> <a href="/wiki/Mongoose-V" title="Mongoose-V">Mongoose-V</a>, <a href="/wiki/NXP_ColdFire" title="NXP ColdFire">ColdFire</a>, and <a href="/wiki/PowerPC" title="PowerPC">PowerPC</a> architectures, which are available in space hardened models. RTEMS is currently orbiting Mars as part of the <a href="/wiki/Electra_(radio)" title="Electra (radio)">Electra software radio</a> on <a href="/wiki/NASA" title="NASA">NASA</a>'s <a href="/wiki/Mars_Reconnaissance_Orbiter" title="Mars Reconnaissance Orbiter">Mars Reconnaissance Orbiter</a>,<sup id="cite_ref-NASA_2-0" class="reference"><a href="#cite_note-NASA-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> and the <a href="/wiki/European_Space_Agency" title="European Space Agency">ESA</a>'s <a href="/wiki/ExoMars_Trace_Gas_Orbiter" class="mw-redirect" title="ExoMars Trace Gas Orbiter">Trace Gas Orbiter</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> </p> <div class="mw-heading mw-heading2"><h2 id="License">License</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=RTEMS&action=edit&section=4" title="Edit section: License"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>RTEMS is distributed under the <a href="/wiki/BSD_licenses" title="BSD licenses">two paragraph BSD license</a>. <sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (November 2024)">citation needed</span></a></i>]</sup> This is a <a href="/wiki/Permissive_software_license" title="Permissive software license">permissive license</a>. </p><p>RTEMS was originally distributed under a modified <a href="/wiki/GNU_General_Public_License" title="GNU General Public License">GNU General Public License</a> (GPL), allowing linking RTEMS objects with other files without needing the full executable to be covered by the GPL. This license is based on the <a href="/wiki/GNAT_Modified_General_Public_License" title="GNAT Modified General Public License">GNAT Modified General Public License</a> with the language modified to not be specific to the programming language <a href="/wiki/Ada_(programming_language)" title="Ada (programming language)">Ada</a>. </p> <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=RTEMS&action=edit&section=5" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1259569809">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output 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class="mw-editsection-bracket">[</span><a href="/w/index.php?title=RTEMS&action=edit&section=6" 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 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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 class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.rtems.org/node/135">"RTEMS 5.3 Released"</a>. 2023-02-10<span class="reference-accessdate">. Retrieved <span class="nowrap">2023-02-10</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=RTEMS+5.3+Released&rft.date=2023-02-10&rft_id=https%3A%2F%2Fwww.rtems.org%2Fnode%2F135&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARTEMS" class="Z3988"></span></span> </li> <li id="cite_note-NASA-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-NASA_2-0">^</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/20060930070717/http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/39788/1/06-0474.pdf">"Real Time Mars Approach Navigation aided by the Mars Network"</a> <span class="cs1-format">(PDF)</span>. NASA. Archived from <a rel="nofollow" class="external text" href="https://trs-new.jpl.nasa.gov/dspace/bitstream/2014/39788/1/06-0474.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2006-09-30<span class="reference-accessdate">. Retrieved <span class="nowrap">2008-01-25</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Real+Time+Mars+Approach+Navigation+aided+by+the+Mars+Network&rft.pub=NASA&rft_id=http%3A%2F%2Ftrs-new.jpl.nasa.gov%2Fdspace%2Fbitstream%2F2014%2F39788%2F1%2F06-0474.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARTEMS" 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 news cs1"><a rel="nofollow" class="external text" href="http://phys.org/news/2016-11-nasa-radio-europe-mars-orbiter.html">"NASA radio on Europe's new Mars Orbiter aces relay test"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2016-12-01</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=NASA+radio+on+Europe%27s+new+Mars+Orbiter+aces+relay+test&rft_id=http%3A%2F%2Fphys.org%2Fnews%2F2016-11-nasa-radio-europe-mars-orbiter.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARTEMS" class="Z3988"></span></span> </li> </ol></div></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=RTEMS&action=edit&section=7" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><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="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/df/Wikibooks-logo-en-noslogan.svg/40px-Wikibooks-logo-en-noslogan.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/df/Wikibooks-logo-en-noslogan.svg/60px-Wikibooks-logo-en-noslogan.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/df/Wikibooks-logo-en-noslogan.svg/80px-Wikibooks-logo-en-noslogan.svg.png 2x" data-file-width="400" data-file-height="400" /></span></span></div> <div class="side-box-text plainlist">Wikibooks has a book on the topic of: <i><b><a href="https://en.wikibooks.org/wiki/RTEMS_for_Embedded_Software_Developers" class="extiw" title="wikibooks:RTEMS for Embedded Software Developers">RTEMS for Embedded Software Developers</a></b></i></div></div> </div> <ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="http://www.rtems.org">Official website</a></span></span></li> <li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="https://devel.rtems.org/">Official website</a></span></span> Wiki</li> <li><a rel="nofollow" class="external text" href="http://rtemscentre.edisoft.pt">RTEMS Centre</a></li></ul> <div class="navbox-styles"><style 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operating system">Real-time operating systems</a> (RTOS)</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Operating_system" title="Operating system">Operating<br />systems</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/POSIX" title="POSIX">POSIX</a> support</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Unix-like" title="Unix-like">Unix-like</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/DNIX" title="DNIX">DNIX</a></i></li> <li><a href="/wiki/Junos_OS" title="Junos OS">Junos OS</a></li> <li><a href="/wiki/LynxOS" title="LynxOS">LynxOS</a></li> <li><i><a href="/wiki/Multi-Environment_Real-Time" title="Multi-Environment Real-Time">Multi-Environment Real-Time</a></i>^ (<i>MERT</i> – <i>Unix-RT</i>)</li> <li><i><a href="/wiki/OS2000" title="OS2000">OS2000</a></i></li> <li><a href="/wiki/QNX" title="QNX">QNX</a>^</li> <li><a href="/wiki/Real-Time_Linux" class="mw-redirect" title="Real-Time Linux">Real-Time Linux</a>°</li> <li><a href="/wiki/RTLinux" title="RTLinux">RTLinux</a>°</li> <li><i><a href="/wiki/UNOS_(operating_system)" title="UNOS (operating system)">UNOS</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/LiteOS" title="LiteOS">LiteOS</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/LiteOS" title="LiteOS">LiteOS</a></i>°</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Partial</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/ChorusOS" title="ChorusOS">ChorusOS</a></i>^</li> <li><a href="/wiki/Integrity_(operating_system)" title="Integrity (operating system)">Integrity</a>^</li> <li><a href="/wiki/Nucleus_RTOS" title="Nucleus RTOS">Nucleus RTOS</a>^</li> <li><a href="/wiki/NuttX" title="NuttX">NuttX</a>^°</li> <li><a href="/wiki/Operating_System_Embedded" class="mw-redirect" title="Operating System Embedded">Operating System Embedded</a>^ (OSE)</li> <li><a href="/wiki/PX5_RTOS" title="PX5 RTOS">PX5 RTOS</a>^</li> <li><a href="/wiki/RIOT_(operating_system)" title="RIOT (operating system)">RIOT</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/TRON_project" title="TRON project">TRON</a> support</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ITRON_project" title="ITRON project">ITRON project</a></li> <li><a href="/wiki/T-Kernel" title="T-Kernel">T-Kernel</a> <ul><li><a href="/wiki/Micro_T-Kernel" title="Micro T-Kernel">Micro T-Kernel</a></li> <li><a href="/wiki/T-Engine_Forum" title="T-Engine Forum">T-Engine Forum</a> (organization)</li> <li><a href="/wiki/T-License" title="T-License">T-License</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Partial</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ECos" title="ECos">eCos</a>°</li> <li><a class="mw-selflink selflink">RTEMS</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/Capability-based_security" title="Capability-based security">Capability-based</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/EROS_(microkernel)" title="EROS (microkernel)">EROS</a></i>^°</li> <li><a href="/wiki/SeL4" class="mw-redirect" title="SeL4">seL4</a>^°</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Java_virtual_machine" title="Java virtual machine">Java virtual machine</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/JavaOS#Chorus/Jazz" title="JavaOS">Chorus/Jazz</a></i>^ (<i><a href="/wiki/JavaOS" title="JavaOS">JavaOS</a></i> + <i><a href="/wiki/ChorusOS" title="ChorusOS">ChorusOS</a></i>^)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/DOS" title="DOS">DOS</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Multiuser_DOS" title="Multiuser DOS">Multiuser DOS</a></i> <ul><li><i><a href="/wiki/Concurrent_DOS" class="mw-redirect" title="Concurrent DOS">Concurrent DOS</a></i></li> <li><i><a href="/wiki/FlexOS" title="FlexOS">FlexOS</a></i></li> <li><i><a href="/wiki/REAL/32" class="mw-redirect" title="REAL/32">REAL/32</a></i></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/L4_microkernel_family" title="L4 microkernel family">L4</a> kernel</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/L4Linux" title="L4Linux">L<sup>4</sup>Linux</a>^°</li> <li><a href="/wiki/PikeOS" title="PikeOS">PikeOS</a>^</li> <li><i><a href="/wiki/REX_OS" title="REX OS">REX OS</a></i>^</li> <li><a href="/wiki/Wombat_(operating_system)" title="Wombat (operating system)">Wombat</a>^°</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Psion_(company)" title="Psion (company)">Psion</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/EKA2" title="EKA2">EKA2</a></i>^° kernel → <i><a href="/wiki/Symbian" title="Symbian">Symbian</a> OS</i>^°</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Microsoft" title="Microsoft">Microsoft</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ThreadX" title="ThreadX">ThreadX</a>^</li> <li><a href="/wiki/Windows_Embedded_Compact" title="Windows Embedded Compact">Windows Embedded Compact</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/IBM" title="IBM">IBM</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/4680_OS" class="mw-redirect" title="4680 OS">4680 OS</a></i></li> <li><i><a href="/wiki/4690_Operating_System" title="4690 Operating System">4690 OS</a></i></li> <li><a href="/wiki/Transaction_Processing_Facility" title="Transaction Processing Facility">Transaction Processing Facility</a> (TPF)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Texas_Instruments" title="Texas Instruments">Texas Instruments</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/DSOS" title="DSOS">DSOS</a></i></li> <li><a href="/wiki/TI-RTOS#RTOS_kernel_overview" title="TI-RTOS">TI-RTOS Kernel</a>^°</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Digital_Equipment_Corporation" title="Digital Equipment Corporation">DEC</a> <a href="/wiki/PDP-11" title="PDP-11">PDP-11</a> <a href="/wiki/VAX" title="VAX">VAX</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/RSX-11" title="RSX-11">RSX-11</a></i></li> <li><i><a href="/wiki/RT-11" title="RT-11">RT-11</a></i></li> <li><i><a href="/wiki/VAXELN" title="VAXELN">VAXELN</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Low resource</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ChibiOS/RT" title="ChibiOS/RT">ChibiOS/RT</a>^°</li> <li><a href="/wiki/Contiki" title="Contiki">Contiki</a>°</li> <li><a href="/wiki/ERIKA_Enterprise" title="ERIKA Enterprise">ERIKA Enterprise</a>°</li> <li>FunkOS°</li> <li><a href="/wiki/Apache_Mynewt" title="Apache Mynewt">Mynewt</a>°</li> <li><i><a href="/wiki/Nano-RK" title="Nano-RK">Nano-RK</a></i>°</li> <li><a href="/wiki/OpenComRTOS" title="OpenComRTOS">OpenComRTOS</a>^</li> <li><a href="/wiki/PX5_RTOS" title="PX5 RTOS">PX5 RTOS</a>^</li> <li><a href="/wiki/RT-Thread" title="RT-Thread">RT-Thread</a>° Nano</li> <li><a href="/wiki/RIOT_(operating_system)" title="RIOT (operating system)">RIOT</a>°</li> <li><a href="/wiki/ThreadX" title="ThreadX">ThreadX</a>^</li> <li><a href="/wiki/Zephyr_(operating_system)" title="Zephyr (operating system)">Zephyr</a>^°</li></ul> </div></td></tr></tbody></table><div> <ul><li><i><a href="/wiki/BeRTOS" title="BeRTOS">BeRTOS</a></i>^°</li> <li><i><a href="/wiki/DioneOS" title="DioneOS">DioneOS</a></i></li> <li><a href="/wiki/Segger_Microcontroller_Systems" title="Segger Microcontroller Systems">embOS</a></li> <li><a href="/wiki/FreeRTOS" title="FreeRTOS">FreeRTOS</a>^°</li> <li><a href="/wiki/Micro-Controller_Operating_Systems" title="Micro-Controller Operating Systems">µC/OS</a>^°</li> <li><a href="/wiki/Green_Hills_Software#Real-time_operating_systems" title="Green Hills Software">µ-velOSity</a>^</li> <li><a href="/wiki/MQX" title="MQX">MQX</a>^</li> <li><a href="/wiki/OS-9" title="OS-9">OS-9</a> (<a href="/wiki/Microware" title="Microware">Microware</a>)</li> <li><a href="/wiki/Phantom_OS" title="Phantom OS">Phantom OS</a>^°</li> <li><i><a href="/wiki/PSOS_(real-time_operating_system)" title="PSOS (real-time operating system)">pSOS</a></i></li> <li><i><a href="/wiki/RMX_(operating_system)" title="RMX (operating system)">RMX</a></i></li> <li><a href="/wiki/RT-Thread" title="RT-Thread">RT-Thread</a>° Standard</li> <li><a href="/wiki/ScreenOS" title="ScreenOS">ScreenOS</a></li> <li><i><a href="/wiki/Sintran_III" title="Sintran III">Sintran III</a></i></li> <li><i><a href="/wiki/THEOS" title="THEOS">THEOS</a></i></li> <li><i><a href="/wiki/Thoth_(operating_system)" title="Thoth (operating system)">Thoth</a></i>^ → <i><a href="/wiki/Harmony_(operating_system)" title="Harmony (operating system)">Harmony</a></i>^</li> <li><a href="/wiki/Versatile_Real-Time_Executive" title="Versatile Real-Time Executive">VRTX</a>^</li> <li><a href="/wiki/VxWorks" title="VxWorks">VxWorks</a></li> <li><a href="/wiki/EulerOS" title="EulerOS">UniProton</a></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Software_framework" title="Software framework">Frameworks</a>, <a href="/wiki/Software_development_kit" title="Software development kit">kits</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <li><a href="/wiki/Robot_Operating_System" title="Robot Operating System">Robot Operating System</a>° 2</li> <li><a href="/wiki/RTAI" title="RTAI">RTAI</a>°</li> <li><a href="/wiki/TI-RTOS" title="TI-RTOS">TI-RTOS</a>^°</li> <li><a href="/wiki/Xenomai" title="Xenomai">Xenomai</a>°</li> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Programmer" title="Programmer">Developers</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Gordon_Bell_(QNX)" title="Gordon Bell (QNX)">Gordon Bell</a></li> <li><a href="/wiki/David_Cheriton" title="David Cheriton">David Cheriton</a></li> <li><a href="/wiki/Dave_Cutler" title="Dave Cutler">Dave Cutler</a></li> <li><a href="/wiki/Dan_Dodge" title="Dan Dodge">Dan Dodge</a></li> <li><a href="/wiki/Adam_Dunkels" title="Adam Dunkels">Adam Dunkels</a></li> <li><a href="/wiki/Ken_Sakamura" title="Ken Sakamura">Ken Sakamura</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><i>Italics</i> <b>= discontinued</b></li> <li><b>^ = <a href="/wiki/Microkernel" title="Microkernel">Microkernel</a></b></li> <li><b>° = <a href="/wiki/Open-source_software" title="Open-source software">Open-source software</a></b><br /><span class="noviewer" typeof="mw:File"><span title="List-Class article"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/d/db/Symbol_list_class.svg/16px-Symbol_list_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/d/db/Symbol_list_class.svg/23px-Symbol_list_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/d/db/Symbol_list_class.svg/31px-Symbol_list_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <b><a href="/wiki/Comparison_of_real-time_operating_systems" title="Comparison of real-time operating systems">Comparison</a></b> 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