Web site:
Origin: USA
Category: workstation, embedded
Desktop environment: CLI
Architecture: x86, Motorolla 68000, PowerPC, SPARC, ARM, MIPS
Based on: Mach kernel
Wikipedia: ChorusOS
Media: Install
The last version | Released: 5.1 | 2011

ChorusOS – a highly scalable and reliable embedded operating system that has established itself among top telecommunications suppliers. The ChorusOS operating system is used in public switches and PBXs, as well as within access networks, cross-connect switches, voice-mail systems, cellular base stations, web-phones, and cellular telephones.

The Sun Embedded Workshop software provides a development environment with the necessary tools to build and deploy the ChorusOS operating system on a telecommunications platform. The ChorusOS operating system is the embedded foundation for Sun’s Service-Driven Network. Offering high service availability, complete hardware and software integration, management capabilities and JavaTM technology support dedicated to telecom needs, the ChorusOS operating system allows the dynamic and cost-efficient deployment of new features and applications while maintaining the reliability and functionality of existing networks.

The ChorusOS operating system supports third-party protocol stacks, legacy applications, and applications based on real-time and Java technology, on a single hardware platform.

The ChorusOS operating system can be tuned very finely to meet the requirements of a given application or environment. The core executive component is always present in an instance of the ChorusOS operating system. Optional features are implemented as components that can be added to, or removed from, an instance of the ChorusOS operating system.

Each API function in the ChorusOS operating system is contained in one or more of the configurable components. As long as at least one of these components is configured into a given instance of the operating system, the function is available. Some library functions are independent of any specific component and are always available.

ChorusOS 5.0 runs over Solaris operating environments, and supports the following targets:
– UltraSPARC II (CP1500 and CP20x0)
– Intel x86, Pentium
– Motorola PowerPC 750 and 74×0 processor family (mpc7xx)
– Motorola PowerQUICC I (mpc8xx) and PowerQUICC II (mpc8260) microcontrollers


No download is available.



Web site: (not active)
Origin: USA
Category: Desktop
Desktop environment:
Architecture: Intel x86, Motorola 68000, SPARC, PA-RISC
Based on: UNIX
Wikipedia: NeXTSTEP
Media: Install
The last version | Released: 4.2 Pre-release 2 | September 1997

NeXTSTEP – an object-oriented, multitasking operating system created by NeXT Computer, Inc. a company founded in 1985 by Apple Computer co-founder Steve Jobs.

This system was created on the base of Mach microkernel and BSD Unix system code. NeXTStep was oriented to work in a graphical environment. It had a very well-prepared, intuitive user interface, based on object-oriented architecture, quite different from both the most popular then Microsoft Windows 3.1 and Mac OS. The visualization engine was based on Postscript, which on one hand made it very demanding in terms of hardware (considerable demand for memory) and on other hand an ideal solution for industrial and designer workstations.

NeXTSTEP 1.0 was released 18 September 1989 after a couple of hits in 1986, and last Release 3.3 in early 1995, and previously worked only on the Motorola 68000 CPU family (especially the original black boxes) and the generic IBM compatible x86/Intel, Sun SPARC , and HP PA-RISC. About the time 3.2 releases NeXT teamed up with Sun Microsystems to develop OpenStep, cross-platform implementation of the standard (for Sun Solaris, Microsoft Windows, and NeXT Mach kernel version) based on NEXTSTEP 3.2.

In February 1997, after the purchase of NeXT by Apple, it became the source of the popular operating systems macOS, iOS, watchOS, and tvOS.

The NeXTSTEP screenshot’s author: Gürkan Sengün; source: Wikipedia; License: GNU GPL.


No download is available.