REX OS

REX Operating System
Developer	Qualcomm
OS family	Embedded operating system
Initial release	1999; 25 years ago
Marketing target	Smartphones
Platforms	ARM
Kernel type	Microkernel based on L4A Pistachio and Iguana
License	Proprietary

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 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.

References

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

External links

This operating-system-related article is a stub. You can help Wikipedia by expanding it.

This mobile software article is a stub. You can help Wikipedia by expanding it.

[baidu-1] Staff. "REX and Common Software". Retrieved 2012-03-10.

[TJ-2] Edgewall Software. "HTC Vision". Retrieved 2012-03-12.

[nextgen-3] Saad Zaman Asif. Next Generation Mobile Communications Ecosystem: Technology Management for Mobile Communications. John Wiley and Sons, 2011-01-11, p. 299.

[1]

[2]

[3]