# Motorola 68451

> memory management unit for the 68010 microprocessor

**Wikidata**: [Q1367842](https://www.wikidata.org/wiki/Q1367842)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Motorola_68451)  
**Source**: https://4ort.xyz/entity/motorola-68451

## Summary
The Motorola 68451 is an integrated-circuit memory management unit (MMU) designed for use with the Motorola 68010 microprocessor. It performs the hardware task of handling memory references, primarily translating virtual memory addresses to physical addresses.

## Key Facts
- The Motorola 68451 is a memory management unit (MMU) for the Motorola 68010 microprocessor.  
- It is an integrated circuit model (instance_of: integrated circuit model).  
- Subclassifications: memory management unit and integrated circuit (subclass_of: memory management unit — Wikipedia revision 978895635, 2021-05-28).  
- Part of the Motorola 68000 family series.  
- Common alias: "68451 MMU".  
- Image available: https://commons.wikimedia.org/wiki/Special:FilePath/MC68451_p1160081.jpg.  
- Freebase identifier: /m/0127jcdq.  
- Wikipedia title: "Motorola 68451"; Commons category: "Motorola 68451"; page appears in 5 Wikimedia sitelinks and in the languages: commons, de, en, hu, no.

## FAQs
### Q: What is the Motorola 68451?
A: The Motorola 68451 is a dedicated memory management unit (MMU) integrated circuit made for the Motorola 68010 microprocessor. It handles memory-reference processing, primarily translating virtual addresses into physical addresses.

### Q: Which CPU family does the 68451 belong to or support?
A: The 68451 is part of, and intended for use with, the Motorola 68000 family of microprocessors, specifically for the 68010.

### Q: Where can I find an image or authoritative reference for the 68451?
A: An image is available on Wikimedia Commons at the URL https://commons.wikimedia.org/wiki/Special:FilePath/MC68451_p1160081.jpg. The device has a Wikipedia entry titled "Motorola 68451".

## Why It Matters
The Motorola 68451 matters because it implements a core hardware function required for modern memory management on systems built around the Motorola 68010 CPU. As an MMU, its primary role is translating virtual memory addresses to physical addresses, which is fundamental for operating system features that rely on address-space abstraction and memory protection. By providing this functionality as a dedicated integrated circuit, the 68451 allowed 68010-based systems to offload address translation from the CPU and centralize memory-reference handling in a single component. Its inclusion in the Motorola 68000 family ecosystem made it a relevant peripheral for designers and engineers building systems that required controlled, translated access to memory. Documentation, images, and identification data (such as its freebase ID and Wikipedia/Commons entries) make it a recognizable and citable element in historical and technical references about 68000-family hardware.

## Notable For
- Being the dedicated MMU designed specifically for the Motorola 68010 microprocessor.  
- Membership in the Motorola 68000 family hardware series.  
- Identification as an integrated circuit model (commonly referenced as "68451 MMU").  
- Publicly available image and Wikimedia documentation with a recorded Wikipedia revision (oldid 978895635, 2021-05-28) supporting its subclass classification.

## Body
### Overview
- The Motorola 68451 is a hardware memory management unit (MMU) implemented as an integrated circuit.  
- It is identified by the common alias "68451 MMU".  
- Its primary documented target CPU is the Motorola 68010, placing it within the 68000 family ecosystem.

### Technical role
- As an MMU, the 68451's main function is to process memory references and translate virtual memory addresses to physical addresses.  
- The provided definition of its parent class (memory management unit) specifies that such units have all memory references passed through them and primarily perform address translation.

### Classification and identifiers
- Instance of: integrated circuit model.  
- Subclass of: memory management unit and integrated circuit (reference to Wikipedia revision 978895635, dated 2021-05-28).  
- Freebase ID: /m/0127jcdq.  
- Wikipedia title: "Motorola 68451".  
- Commons category: "Motorola 68451".

### Series and compatibility
- Part of the Motorola 68000 family series, with specific association to the 68010 microprocessor.

### Documentation and media
- Public image: https://commons.wikimedia.org/wiki/Special:FilePath/MC68451_p1160081.jpg.  
- Wikimedia sitelink presence: 5 sitelinks.  
- Wikipedia/Commons language entries listed: commons, de, en, hu, no.

### Source note
- Subclass classification information references a Wikipedia revision (oldid=978895635, 2021-05-28) as provided in the structured data.