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REX OS
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<p>The REX Operating System (Real-time Executive Operating System) is a <a href="/facts/Real-time_operating_system/IvUCFwCL">real-time operating system</a> (RTOS) developed by <a href="/facts/Qualcomm/v54S3UgA">Qualcomm</a> for the <a href="/facts/ARM_architecture/SALsYA79">ARM</a> <a href="/facts/Processor_(computing)/z3wPljrI">processor</a> based mobile phone Dual-Mode Subscriber Station (DMSS) or Advanced Mode Subscriber Software (AMSS) development. As of 2007, most Korean cell phones ran on REX. </p><p>REX is a combination of two <a href="/facts/Operating_system/8XTuvMh2">operating systems</a>: <i><a href="/facts/L4_microkernel_family/1rrWcHKB">L4Ka::Pistachio</a></i> embedded <a href="/facts/Microkernel/wsaWtYCU">microkernel</a> and <i><a href="/facts/IGUANA_Computing/mmglL1A6">Iguana</a></i>, with extensive modifications and extensions by Qualcomm and <a href="/facts/HTC/RxsVc2ec">HTC</a>. </p><p>Originally developed for the <a href="/facts/Intel_80186/jUjWLMEX">Intel 80186</a>, it was then ported to <a href="/facts/ARM_architecture/SALsYA79">ARM</a>, and <a href="/facts/X86/Kypq5fgu">x86</a> architectures are no longer supported. REX is not <a href="/facts/POSIX/mQkSt234">POSIX</a> compliant or <a href="/facts/Open-source_software/HzTaB8E9">open-source software</a> and requires a <a href="/facts/Proprietary_software/9zcskxYL">proprietary</a> <a href="/facts/Software_license/7enfIqhL">software license</a> from Qualcomm for use. </p><p>It seems not to be actively developed or marketed as of 2012, but is used in currently or recently sold low end cell phones, typically for use by pay-as-you-go customers, like the <a href="/facts/Samsung_SPH-M300/2bDIYzzw">Samsung SPH-M300</a>. </p>