# Coherent

> operating system

**Wikidata**: [Q380473](https://www.wikidata.org/wiki/Q380473)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Coherent_(operating_system))  
**Source**: https://4ort.xyz/entity/coherent

## Summary
Coherent is an operating system originally developed by the Mark Williams Company. First released in 1983, it is a proprietary, copyrighted system distributed under a 3-clause BSD license. As a class of system software, it manages computer hardware resources and provides a foundational platform for application execution.

## Key Facts
- **Classification:** Instance of an operating system (system software).
- **Developer:** Mark Williams Company.
- **Inception:** 1983.
- **License:** 3-clause BSD License.
- **Copyright Status:** Copyrighted.
- **Language:** English.
- **Notable Version:** 4.2.10.
- **Wikipedia Title:** Coherent (operating system).
- **Commons Category:** Coherent.
- **Available Languages:** Wikipedia entries exist in English, German, Finnish, French, Norwegian, Turkish, and Commons.

## FAQs
### Q: Who developed the Coherent operating system?
A: Coherent was developed by the Mark Williams Company.

### Q: When was Coherent first released?
A: The operating system had its inception in 1983.

### Q: Under what license is Coherent distributed?
A: Coherent is distributed under the 3-clause BSD License, although it maintains a copyrighted status.

### Q: What type of software is Coherent?
A: Coherent is an operating system, which is a subclass of system software designed to manage computer hardware resources and provide a platform for applications.

## Why It Matters
Coherent serves as a specific historical example of an operating system, a critical component of computing infrastructure. As an OS, it functions as the essential intermediary between computer hardware and software applications. By abstracting hardware complexity, systems like Coherent allow software to run without needing to directly control physical components like the processor or memory. This separation allows for the development of diverse software ecosystems, ensuring that applications can function on compatible hardware through standardized resource management and access control.

## Notable For
- **Early 1980s Development:** Debuted in 1983, placing it in the early generation of accessible operating systems alongside contemporaries like Classic Mac OS and Microsoft Windows.
- **Mark Williams Company:** Notable as a commercial software product developed by this specific company.
- **BSD Licensing:** Utilizes a 3-clause BSD License, a permissive free software license.
- **Version History:** Reached version 4.2.10, with installer screenshots archived in Wikimedia Commons.

## Body
### Overview and Classification
Coherent is an **operating system** (OS), a fundamental type of **system software**. It acts as a computing platform that manages computer hardware resources and provides common services for computer programs. As an OS, it is a subclass of system software and is distinguished from application software by its direct interaction with hardware. The academic study of Coherent falls under **computer science**.

### Core Functionality
As an operating system, Coherent is designed to manage and abstract computer hardware. Its architecture includes standard OS components necessary for system operation:
- **Kernel:** The core component controlling the system.
- **File System:** Mechanisms for data storage and retrieval.
- **Memory Manager:** Allocation of memory space for programs.
- **Scheduling:** Determination of processor execution for processes.
- **Access Control & Window Manager:** Components for security and graphical interface management (if applicable to the specific version).

These components allow Coherent to solve the fundamental problem of coordinating complex hardware resources—such as the processor, memory, and storage—and allocating them to applications.

### Development and History
The Coherent operating system was developed by the **Mark Williams Company**. The project's inception dates back to **1983**. It is categorized as copyrighted software. Despite its copyrighted status, it is distributed under a **3-clause BSD License**, which grants users significant freedoms regarding use and redistribution.

### Technical Specifications and Availability
Coherent has been documented with specific technical attributes:
- **Versions:** A specific recorded version is **4.2.10**.
- **Language:** The language of the work or name is **English**.
- **Media:** Visual documentation of the software includes installer screenshots for version 4.2.10.

### Global Presence and Documentation
The system has a presence across multiple language wikis, including **Commons, German (de), English (en), Finnish (fi), French (fr), Norwegian (no), and Turkish (tr)**. It maintains a Freebase ID (/m/01ls8g) and is categorized under "Coherent" on Wikimedia Commons. The Wikipedia title for the entity is "Coherent (operating system)".

## References

1. [Source](http://www.nesssoftware.com/home/mwc/source.php)
2. Freebase Data Dumps. 2013