This article needs to be updated. Please help update this article to reflect recent events or newly available information. Last update: 2012(May 2023)
Operating system
REX Operating System
Developer
Qualcomm
Written in
C[1]
OS family
L4A Pistachio and Iguana embedded operating system
Working state
Discontinued
Source model
Proprietary
Initial release
1999; 25 years ago (1999)[1]
Marketing target
Smartphones
Platforms
ARM
Kernel type
Microkernel RTOS
License
Proprietary
The REX Operating System (Real-time Executive Operating System) is a real-time operating system (RTOS) developed by Qualcomm for the ARM processor 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.
REX is a combination of two operating systems: L4Ka::Pistachio embedded microkernel and Iguana, with extensive modifications and extensions by Qualcomm and HTC.[2]
Originally developed for the Intel 80186, it was then ported to ARM, and x86 architectures are no longer supported. REX is not POSIX compliant or open-source software and requires a proprietary software license from Qualcomm for use.[3]
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 Samsung SPH-M300.
^ ab"REX and Common Software". Retrieved 2012-03-10.
^Asif, Saad Zaman (2011-01-11). Next Generation Mobile Communications Ecosystem: Technology Management for Mobile Communications. John Wiley and Sons. p. 299.
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