This category has information on only RealTime Operating Systems (RTOSs), and closely related material. Realtime systems are not the same as embedded systems. Realtime OSs can be used in general purpose computers, and in embedded types. Some embedded OSs are not realtime, and cannot serve some uses. Why segregate RTOSs so fully? Three clear reasons exist: 1) The functional divide between RTOSs and non-RTOSs is large, which profoundly effects design: all OSs must provide logically correct/precise results, but RTOSs must go beyond this and give temporal (time) correctness. RTOSs are the only logical and safe choice for time-critical uses. 2) More RTOSs than non-RTOSs (fewer non-RTOSs than RTOSs) are in use, in this solar system at least. 3) Directory user needs are different: those seeking information on RTOSs usually need no information on non-RTOSs, and vice versa, those interested in non-RTOSs usually need no information on RTOSs. On this page, links are arranged in three groups and levels: 1) Top group: issues spanning multiple unrelated OSs. 2) Middle group: types or classes of OS, or OSs for which there are more than one instance of an OS of this name/type, an OS family. 3) Bottom group: specific OSs, individual instances; there is only one OS of this name/type.

Subcategories 35

C Kernel
Realtime preemptive kernel coded fully in C, so is highly portable to different hardware platforms and easily embeddable; Descriptions, full source code, examples, C Style Guide and programming Guidelines. [Free]
CMX Company
Makes multitasking RTOS products: CMX-RTX (full RTOS), CMX-TINY+ (small RTOS), CMX-TCP/IP, CMXBug, CMXTracker. These support most 8/16/32/64-bit embedded controllers, processors, DSPs, over 30 compiler vendors.
Enea
Develops and distributes the OSE family of real-time operating systems and embedded development tools for high reliability telecom/datacom, medical, automotive and safety critical applications.
Fusion RTOS
A fast (190 cycle context switch), small (1-1.5 K), designed and optimized for next generation DSP systems; and Fusion Net (TCP/IP Stack), Fusion Web (services); all support priority based, realtime, preemptive, multitasking. By Unicoi Systems, Inc.
Fusion RTOS
Details the specs for the Fusion RTOS from Unicoi Systems, an embedded software provider which delivers its RTOS to customers, free of charge.
JMI Software Systems, Inc.
Makes C Executive and PSX multitasking, ROMable kernels for embedded systems. C Ex runs on 8/16/32 bit CISC CPUs, many RISC CPUs, DSPs, over 20 so far: fast context switch, compact. Options: DOS file system, TCP/IP, SNMP. PSX is medium-size kernel, between small basic kernels and full Unix; optional subset of POSIX.1 system calls.
Kadak Products Ltd.
Makes AMX RTOS, KwikNet TCP/IP stack and Web server, KwikLook fault finder, KwikPeg GUI with graphics library. A high quality realtime software foundation for embedded products.
Micro Digital, Inc.
Makes SMX: no-royalty, modular, preemptive multitasking, small fast, many featured RTOS for embedded systems. Portable to all 32-bit processors, now on ARM, ColdFire, PowerPC, SH3/4, x86. Unlike generic C kernels, it exploits strengths of x86 to make it easier to program.
On Time Informatik GmbH
Makes RTOS-32, and realtime multitasking development tools, for x86-based embedded systems; no royalty, full source code available on all products. Supports Borland, Microsoft, Watcom C/C++ compilers; DOS, Win32 compatible API gives easy ports of extant programs.
Plan 9 from Bell Labs Real Time Capabilities
A collection of papers about the real time capabilities of the Plan 9 kernel.
Pumpkin, Inc.
Makes Salvo RTOS, designed expressly for very low cost embedded systems with highly limited ROM and RAM (normal uses: 1-2K ROM, 50-100 bytes RAM) and/or no software stack. Priority-based, cooperative multitasking, event services, real-time delays.
QP state machine frameworks
Open source, state machine frameworks for embedded systems by Quantum Leaps.
Quadros Systems, Inc.
Makes RTXC 3.2 and RTXC Quadros, for convergent processing in embedded uses. Seamless use with microprocessors, DSPs. Configurations: single stack, dual stack, multi stack; multicore, multiprocessing.
Realtime Operating System
Growing article, with links to many related topics. Wikipedia.
SCIOPTA RTOS
Assembly coded high performance kernels, internet protocols (TCP/IP), filesystem, support for distributed systems, DRUID system level debugger. Supports most 32-bit processors; COMPACT is for 8/16-bit controllers. By Litronic AG.
Segger Microcontroller Systeme GmbH
Makes, sells, supports embOS RTOS for embedded uses, multitasking, minimum cost, no royalty, fully interruptible, efficient for time critical uses, RAM and ROM needs so small it fits 1-chip uses, leaving more room for user programs.
SW Datentechnik GmbH
Realtime software, hardware, services: QNX, SQL, multiplatform RAD, portable UNIX-Windows, networking, RAID, multiport.
TenAsys Corp.
Specializes in real-time virtual machine technology that combines the Windows OS and a hard real-time OS on a single x86 PC compatible computer.
TurboTask RTOS
For Z80 and Z180 compatible processors; full-featured, tiny, size ranges from 1k to 2.5k, set by features used; written in pure Assembly, making it maximally small, fast; no royalty; low cost licenses for binary and full source code. By Softools, Inc.
VITA
The VMEbus International Trade Association
Wind River Systems, Inc.
Makes pSOSystem, OSEKWorks, Virtuoso, VxWorks RTOSs (and BSD/OS). Providing full embedded system software and design automation solutions: software, hardware, custom design, and support.
Xpolyplus
Realtime OS and development system for programs for industrial automation, telecontrol, machine automation. It is C-Scada: does all functions of SCADA, plus control (more so with neXor I/O hardware); by XPLAB. English, Italian.

Other languages 1

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