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RT-Thread
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<h2 id="variants">Variants</h2> <p>In 2006, RT-Thread began as an open-source real-time operating system (RTOS) that is mainly written in the <a href="/facts/Programming_language/cWTYbgWa">programming language</a> <a href="/facts/C_(programming_language)/Ky2No763">C</a>. In 2017, a second variant was released for resource-constrained microcontrollers; it needs a minimum of 3 kB <a href="/facts/Flash_memory/Cn8JsStx">flash memory</a> or <a href="/facts/Read-only_memory/P9QMuDLH">read-only memory</a> (ROM) and 1.2 kB <a href="/facts/Random-access_memory/DuD4bxh6">random-access memory</a> (RAM). Also, RT-Thread's first variant was named <i>Standard</i>, and second variant was named <i>Nano</i>.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Embedded_system/a4muX1wU">Embedded system</a></li> <li><a href="/facts/Microcontroller/MKrnAhnm">Microcontroller</a></li> <li><a href="/facts/Single-board_microcontroller/oMLzedLU">Single-board microcontroller</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://www.rt-thread.io">Official website</a></li> <li><a href="https://github.com/RT-Thread">RT-Thread</a> on <a href="/facts/GitHub/n1hNCsc3">GitHub</a></li> <li><a href="https://gitee.com/rtthread/rt-thread">gitee repository</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"RT-Thread 启动下一代RTOS演化". <a href="https://www.rt-thread.io" target="_blank">https://www.rt-thread.io</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"RT-Thread github". GitHub. 23 October 2022. <a href="https://github.com/RT-Thread/rt-thread" target="_blank">https://github.com/RT-Thread/rt-thread</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Introduction to the Zephyr RTOS". Nordic Semiconductor. October 6, 2020. <a href="https://youtube.com/watch?v=jR5E5Kz9A-k" target="_blank">https://youtube.com/watch?v=jR5E5Kz9A-k</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"RT-Thread 启动下一代RTOS演化". <a href="https://www.rt-thread.io" target="_blank">https://www.rt-thread.io</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"RT-Thread github". GitHub. 23 October 2022. <a href="https://github.com/RT-Thread/rt-thread" target="_blank">https://github.com/RT-Thread/rt-thread</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> </ol>