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Sequent Computer Systems was a computer company that designed and manufactured multiprocessing computer systems. They were among the pioneers in high-performance symmetric multiprocessing (SMP) open systems, innovating in both hardware and software.
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The SCO Group was an American software company in existence from 2002 to 2012 that became known for owning Unix operating system assets that had belonged to the Santa Cruz Operation, including the UnixWare and OpenServer technologies, and then, under CEO Darl McBride, pursuing a series of high-profile legal battles known as the SCO-Linux controversies.
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Merge is a software system which allows a user to run DOS/Windows 3.1 on SCO UNIX, in an 8086 virtual machine.
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The history of Unix dates back to the mid-1960s, when the Massachusetts Institute of Technology, AT&T Bell Labs, and General Electric were jointly developing an experimental time-sharing operating system called Multics for the GE-645 mainframe. Multics introduced many innovations, but also had many problems. Bell Labs, frustrated by the size and complexity of Multics but not its aims, slowly pulled out of the project. Their last researchers to leave Multics – among them Ken Thompson, Dennis Ritchie, Doug McIlroy, and Joe Ossanna – decided to redo the work, but on a much smaller scale.
In some versions of the Unix operating system, the term universe was used to denote some variant of the working environment. During the late 1980s, most commercial Unix variants were derived from either System V or BSD. Most versions provided both BSD and System V universes and allowed the user to switch between them. Each universe, typically implemented by separate directory trees or separate filesystems, usually included different versions of commands, libraries, man pages, and header files. While such a facility offered the ability to develop applications portable across both System V and BSD variants, the requirements in disk space and maintenance gave them a problematic reputation. Systems that offered this facility included Harris/Concurrent's CX/UX, Convex's Convex/OS, Apollo's Domain/OS, Pyramid's DC/OSx, Concurrent's Masscomp/RTU, MIPS Computer Systems' RISC/os, Sequent's DYNIX/ptx and Siemens' SINIX.
Microport Systems (1985–2002) was a software development group that pioneered a new approach towards software ports that dramatically reduced development costs and, consequently, the price charged for UNIX. Microport created the first ports of AT&T's UNIX System V for the IBM 286 and 386 personal computers, as well as IBM's PS/2 systems. Microport was critical to enabling the Free Software Foundation (FSF) to port its GNU C compiler (gcc) and associated utilities, onto the x86 architecture by donating a complete 386 development system to the Richard Stallman-led group. Microport also played a key role in Kevin Mitnick's first arrest, after he broke into the internal computer networks of both Microport and The Santa Cruz Operation.
Locus Computing Corporation was formed in 1982 by Gerald J. Popek, Charles S. Kline and Gregory I. Thiel to commercialize the technologies developed for the LOCUS distributed operating system at UCLA. Locus was notable for commercializing single-system image software and producing the Merge package which allowed the use of DOS and Windows 3.1 software on Unix systems.
A Unix-like operating system is one that behaves in a manner similar to a Unix system, although not necessarily conforming to or being certified to any version of the Single UNIX Specification. A Unix-like application is one that behaves like the corresponding Unix command or shell. Although there are general philosophies for Unix design, there is no technical standard defining the term, and opinions can differ about the degree to which a particular operating system or application is Unix-like.
References
- ↑ "New Version of IBM DB2 Universal Database". May 17, 1999.
- ↑ "Emerging Technologies Multi/Parallel Processing" (PDF).
- ↑ DYNIX/ptx System Administration Guide, Volume 1 (1003-59809-00). Sequent Computer Systems, Inc.
- ↑ "The system we investigated was a NUMA-Q 2000 System from IBM running a proprietary, System V based, operating system DYNIX/ptx."Mohamed Ibrahim; Josef Küng; Norman Revell (2000). Database and Expert Systems Applications: 11th International. ISBN 3540679782.
- ↑ "SCO pulls second IBM Unix license". CNET.
- ↑ "IBM drops Intel high-end server". Computerworld. May 13, 2002.
- ↑ "Sequent "Project Monterey" Road Map". Computerworld. February 1, 1999. p. 28.
- ↑ "Caldera loads Linux apps on UnixWare". ZDNet .
- ↑ "Problems managing Sequent Dynix 4.1.4" . Retrieved July 5, 2019.
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