# VP/CSS

> defunct time-sharing operating system for IBM mainframes

**Wikidata**: [Q7907414](https://www.wikidata.org/wiki/Q7907414)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/VP/CSS)  
**Source**: https://4ort.xyz/entity/vp-css

## Summary
VP/CSS is a defunct time-sharing operating system designed for IBM mainframes. Developed jointly by National CSS and IBM, it operated on the IBM System/360 Model 67 and IBM System/370 platforms. As an operating system, its primary function was to manage computer hardware resources.

## Key Facts
*   **Classification:** VP/CSS is an instance of an operating system.
*   **Status:** The system is currently defunct.
*   **Function:** It functioned as a time-sharing operating system.
*   **Target Platform:** The software was designed for IBM mainframes, specifically the IBM System/360 Model 67 and IBM System/370.
*   **Developers:** The operating system was developed by National CSS and IBM.
*   **Core Capability:** As an operating system, it managed computer hardware resources.
*   **Freebase ID:** /m/025ts88

## FAQs
### Q: What type of system was VP/CSS?
A: VP/CSS was a time-sharing operating system. It is now classified as defunct.

### Q: What hardware was compatible with VP/CSS?
A: VP/CSS was utilized on IBM mainframes, specifically supporting the IBM System/360 Model 67 and the IBM System/370.

### Q: Who were the developers of VP/CSS?
A: The operating system was developed by National CSS and IBM.

## Why It Matters
VP/CSS holds historical significance as an early example of time-sharing technology implemented on major enterprise hardware. In the context of mainframe computing, operating systems like VP/CSS were essential for managing the expensive and powerful hardware resources of the era, such as the IBM System/360 and 370 series. By facilitating time-sharing, the system allowed for more efficient allocation of computing power, likely serving multiple users or tasks simultaneously.

The collaboration between National CSS and IBM highlights the ecosystem of software development surrounding mainframe architectures before the dominance of modern standalone operating systems. While defunct, it represents a specific era of computing where resource management and time-sharing were critical technical challenges solved by software like VP/CSS.

## Notable For
*   **Time-Sharing Capability:** It provided time-sharing functionality for mainframes.
*   **Platform Specificity:** It was distinctively tailored for the IBM System/360 Model 67 and System/370.
*   **Dual Development:** It was a product of collaboration between National CSS and the hardware manufacturer, IBM.
*   **Resource Management:** It fulfilled the essential role of managing computer hardware resources.

## Body
### System Overview
VP/CSS is identified as a defunct operating system within the domain of computer software. It falls under the class of "operating system," defined as software that manages computer hardware resources. The system is specifically categorized as a time-sharing operating system, a method which allows multiple users or processes to access the mainframe's resources simultaneously.

### Platform and Development
The operating system was built to function on IBM mainframe architecture. Specifically, VP/CSS ran on the **IBM System/360 Model 67** and the **IBM System/370**.

The development of VP/CSS is attributed to two entities:
*   **National CSS**
*   **IBM**

### Metadata
*   **Freebase ID:** /m/025ts88
*   **Wikidata Description:** Defunct time-sharing operating system for IBM mainframes.