# R4000

> RISC microprocessor

**Wikidata**: [Q3032799](https://www.wikidata.org/wiki/Q3032799)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/R4000)  
**Source**: https://4ort.xyz/entity/r4000

## Summary
R4000 is a RISC microprocessor and a CPU model that implements the MIPS architecture. It was developed by MIPS Technologies and has been manufactured by multiple companies including Integrated Device Technology, NEC, and Toshiba.

## Key Facts
- R4000 is a RISC microprocessor that implements the MIPS architecture.  
- Developer: MIPS Technologies.  
- Manufacturers: Integrated Device Technology, NEC, and Toshiba.  
- Aliases: MIPS R4000 and R4400.  
- Instance of: CPU model; Subclass of: central processing unit.  
- Freebase ID: /m/05_5phv.  
- Image available on Wikimedia Commons: https://commons.wikimedia.org/wiki/Special:FilePath/KL_Toshiba_MIPS_R4000.jpg.  
- Library of Congress authority ID: sh93002870.  
- National Library of Israel j9u ID: 987007556234105171.  
- Wikidata sitelink_count: 8; Wikipedia title: R4000; Wikimedia Commons category: R4000.

## FAQs
### Q: What is the R4000?
A: The R4000 is a RISC microprocessor (CPU model) that implements the MIPS instruction set architecture and is identified in documentation and catalogs as a member of the MIPS processor family.

### Q: Who developed and manufactured the R4000?
A: The R4000 was developed by MIPS Technologies and has been manufactured by multiple firms, including Integrated Device Technology, NEC, and Toshiba.

### Q: What instruction set does the R4000 use?
A: The R4000 uses the MIPS architecture instruction set.

### Q: Where can I find authoritative identifiers or images for the R4000?
A: Identifiers include Freebase ID /m/05_5phv, Library of Congress authority ID sh93002870, and National Library of Israel j9u ID 987007556234105171; an image is hosted on Wikimedia Commons at the link above.

## Why It Matters
The R4000 is significant as a named CPU model implementing the MIPS architecture, a well-known RISC instruction set. As a central processing unit model, it represents a class of processors used to execute machine instructions in computing systems. The fact that development was by MIPS Technologies and manufacturing was carried out by multiple semiconductor companies (Integrated Device Technology, NEC, and Toshiba) shows that the design was produced and distributed across different vendors. That multi-supplier manufacture and the presence of formal identifiers (Freebase, Library of Congress, national library record) and media (Wikimedia Commons image) make the R4000 a documented and citable component within the MIPS family of processors. For researchers, hardware historians, and engineers referencing MIPS-based systems, the R4000 is a distinct model entry with cross-references across library and web resources.

## Notable For
- Being a RISC microprocessor that implements the MIPS architecture.  
- Developed by MIPS Technologies and produced by multiple manufacturers (Integrated Device Technology, NEC, Toshiba).  
- Known under aliases including "MIPS R4000" and "R4400."  
- Documented in library authorities and web resources (Freebase, Library of Congress, National Library of Israel, Wikimedia Commons).  
- Classified as an instance of a CPU model and a subclass of central processing unit.

## Body

### Overview
- R4000 is described as a RISC (Reduced Instruction Set Computer) microprocessor.  
- It is identified on Wikidata and Wikipedia under the title "R4000" and has a Wikimedia Commons category named "R4000."

### Development and Manufacturing
- Developer: MIPS Technologies.  
- Manufacturers listed: Integrated Device Technology, NEC, and Toshiba.  
- The product has been referenced and cataloged across multiple sources, as indicated by library and authority identifiers.

### Technical classification
- Instance of: CPU model.  
- Subclass of: central processing unit.  
- Instruction set: MIPS architecture.  
- Aliases recorded: "MIPS R4000" and "R4400."

### Identifiers and media
- Freebase ID: /m/05_5phv.  
- Library of Congress authority ID: sh93002870.  
- National Library of Israel j9u ID: 987007556234105171.  
- Wikimedia Commons image: https://commons.wikimedia.org/wiki/Special:FilePath/KL_Toshiba_MIPS_R4000.jpg.  
- Wikidata sitelink_count: 8; available Wikipedia and Commons language links include en, eo, es, fr, hu, ja, no, and commons.

### Related organizations
- Toshiba: listed as one of the manufacturers; Toshiba is a Japanese multinational conglomerate corporation (inception value noted as 1875 in the source material) with headquarters in Minato, Japan.  
- NEC: listed as one of the manufacturers; NEC is a Japanese technology corporation (inception value noted as 1899-07-17 in the source material) with headquarters in Tokyo, Japan.  
- Integrated Device Technology: listed as a manufacturer in the R4000 record.

### References and cataloging
- The R4000 entry includes authoritative identifiers useful for library, archival, and cataloging purposes (Freebase, Library of Congress, National Library of Israel).  
- The presence of a Wikimedia Commons image and multiple Wikipedia-language links indicates available public media and documentation.

## References

1. [Source](https://github.com/JohnMarkOckerbloom/ftl/blob/master/data/wikimap)
2. National Library of Israel Names and Subjects Authority File