# VOS3

> Operating system from Hitachi

**Wikidata**: [Q11252810](https://www.wikidata.org/wiki/Q11252810)  
**Source**: https://4ort.xyz/entity/vos3

## Summary
VOS3 is an operating system developed by Hitachi, based on IBM's MVS, designed for mainframe computers like the IBM System/370. It is a virtual-storage operating system that manages hardware resources, similar to other mainframe OS like z/OS.

## Key Facts
- **Based on MVS**: VOS3 was developed as a derivative of IBM's MVS operating system.
- **Platform**: Designed for mainframe computers, specifically the IBM System/370.
- **Developer**: Created by Hitachi, a Japanese company.
- **Instance of**: Classified as an operating system.
- **Country of origin**: Japan.
- **Aliases**: Also known as Virtual-storage Operating System 3 (VOS3) and Hitachi VOS.
- **Wikipedia availability**: Only available in Japanese.
- **Official documentation**: Described at [Hitachi's official page](http://www.hitachi.co.jp/Prod/comp/soft1/VOS3/index.html) (Japanese).

## FAQs
### Q: What is VOS3 used for?
A: VOS3 is a mainframe operating system designed to manage hardware resources, similar to IBM's MVS and z/OS. It was developed by Hitachi for use on IBM System/370 mainframe computers.

### Q: Who developed VOS3?
A: VOS3 was developed by Hitachi, a Japanese company, as a derivative of IBM's MVS operating system.

### Q: Is VOS3 still in use today?
A: The source material does not provide information on its current usage, but it was developed by Hitachi and documented on their official page as of April 29, 2018.

### Q: What makes VOS3 different from other mainframe operating systems?
A: VOS3 is based on IBM's MVS, making it part of the same family of mainframe operating systems. Its specific features and differences from other systems are not detailed in the provided source material.

### Q: Where can I find more information about VOS3?
A: Official documentation is available in Japanese at [Hitachi's VOS3 page](http://www.hitachi.co.jp/Prod/comp/soft1/VOS3/index.html).

## Why It Matters
VOS3 represents Hitachi's contribution to the mainframe operating system market, providing an alternative to IBM's MVS and z/OS. As a virtual-storage operating system, it was designed to efficiently manage hardware resources on IBM System/370 mainframe computers. While its exact impact or current usage is not detailed in the source material, it highlights Hitachi's role in developing compatible mainframe solutions. For organizations relying on mainframe systems, VOS3 offers a Japanese-developed alternative to IBM's dominant operating systems, though its adoption and long-term relevance remain unclear.

## Notable For
- **Derivative of MVS**: VOS3 was based on IBM's MVS, positioning it as a competitor in the mainframe OS market.
- **Japanese origin**: Developed by Hitachi, a Japanese company, offering a non-IBM alternative for mainframe systems.
- **Mainframe compatibility**: Designed for IBM System/370, ensuring compatibility with existing mainframe hardware.
- **Virtual-storage architecture**: Like MVS, VOS3 was a virtual-storage operating system, optimizing memory management for mainframe workloads.

## Body
### Overview
VOS3 is an operating system developed by Hitachi, based on IBM's MVS. It was designed for mainframe computers, specifically the IBM System/370. The system is classified as a virtual-storage operating system, similar to MVS and z/OS, which manage hardware resources efficiently.

### Development and Origin
- **Developer**: Hitachi, a Japanese company.
- **Based on**: IBM's MVS operating system.
- **Country of origin**: Japan.
- **Aliases**: Also known as Virtual-storage Operating System 3 (VOS3) and Hitachi VOS.

### Technical Specifications
- **Platform**: IBM System/370 mainframe computers.
- **Instance of**: Operating system.
- **Wikipedia availability**: Only available in Japanese.

### Documentation and References
- **Official documentation**: Available at [Hitachi's VOS3 page](http://www.hitachi.co.jp/Prod/comp/soft1/VOS3/index.html) (Japanese).
- **Last documented update**: April 29, 2018.

### Comparison to Other Systems
- **Related to**: MVS and z/OS, both mainframe operating systems.
- **Competitive alternative**: VOS3 was developed as a competitor to IBM's dominant mainframe OS offerings.