|OS family||Embedded operating system|
|Kernel type||Microkernel based on L4A Pistachio and Iguana|
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.
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.
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.
REX is a Real-time operating system with the following features:
- Preemptive multitasking
- Task management
- Task synchronization
- Exclusive lock
- Interrupt management
- Uses less than 5K of ROM
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