REX OS

The REX Operating System (Real-Time Executive Operating System) is an RTOS developed by Qualcomm for the ARM-based mobile phone Dual-Mode Subscriber Station (DMSS) or Advanced Mode Subscriber Software (AMSS) development. As of 2007 most Korean cell phones run on REX.

REX Operating System
DeveloperQualcomm
OS familyEmbedded operating system
Initial release1999 (1999)[1]
Marketing targetSmartphones
PlatformsARM
Kernel typeMicrokernel based on L4A Pistachio and Iguana
LicenseProprietary

REX is an L4A Pistachio embedded micro-kernel and Iguana operating system combination and has extensive Qualcomm and HTC modifications and extensions.[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 and requires a license from Qualcomm for use.[3]

It does not seem 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.

Features

REX is a Real-time operating system with the following features:

REX does not provide any memory protection features but does have memory management capabilities.

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References
  1. Staff. "REX and Common Software". Retrieved 2012-03-10.
  2. Edgewall Software. "HTC Vision". Retrieved 2012-03-12.
  3. Saad Zaman Asif. Next Generation Mobile Communications Ecosystem: Technology Management for Mobile Communications. John Wiley and Sons, 2011-01-11, p. 299.
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