Last Updated on: 24th July 2023, 03:54 pm

Web site:
Origin: USA
Category: Desktop
Desktop environment: CLI
Architecture: x86
Based on: UNIX-like
Wikipedia: Coherent_(operating_system)
Media: Install
The last version | Released: 4.2.10 | May 1994

Coherent – a clone of the UNIX operating system for Intel 286/386/486 based systems.

In 1992 COHERENT 4.0 for the 386/486 was released, and the whole system looked pretty much like the UNIX System V.3 boxes. This is meant API wise, UNIX System V.3 has many more features than COHERENT, but it is possible to get most software written for UNIX working on COHERENT. Also the system is iBCS2 compatible, so it runs the same shrinkwrap applications like the other 386 UNIX systems from SCO, Interactive and so on. The old HDB uucp was replaced with Taylor uucp from Ian Lance Taylor, which you’ll still find on almost any modern UNIX systems nowadays.

In 1994 Mark Williams released COHERENT 4.2, with STREAMS, POSIX.1 and POSIX.2 compatibility and other features, that made the system pretty much look like UNIX System V.4. Again, meant API wise, UNIX System V.4 has many more features than COHERENT.

In January 2015, Robert “Bob” Swartz (founder and president of MWC) agreed to open posting of COHERENT command and system sources under this Open Source license.

The operating system was a proprietary product, but it became open source in 2015, released under a 3-clause BSD License.
Developer of the project is Mark Williams Company (MWC), the company was closed in 1995.

Copyright © 1977-1995 by Robert Swartz. All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
This software is provided by the copyright holders and contributors “as is” and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall the copyright holder or contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibility of such damage.

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