# Alpha 21464

> unfinished microprocessor

**Wikidata**: [Q4734973](https://www.wikidata.org/wiki/Q4734973)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Alpha_21464)  
**Source**: https://4ort.xyz/entity/alpha-21464

## Summary
The Alpha 21464 is an unfinished microprocessor developed by Digital Equipment Corporation (DEC) as part of the Alpha series of central processing units (CPUs). It was designed to succeed the Alpha 21364 chip but was never completed. As a high-performance RISC-based processor, it represented an evolutionary step in DEC's microprocessor lineup.

## Key Facts
- **Manufacturer**: Digital Equipment Corporation (DEC).
- **Instance of**: CPU model; subclass of central processing unit.
- **Predecessor**: Alpha 21364 chip.
- **Aliases**: Alpha 21464 chip.
- **Wikidata Description**: Unfinished microprocessor.
- **Sitelink Count**: 3 (Wikipedia pages in English, Hungarian, and Korean).
- **Freebase ID**: `/m/05zxck1`.
- **Development Status**: Never completed or released.

## FAQs
### Q: Was the Alpha 21464 ever released?
A: No, the Alpha 21464 remained an unfinished project and was not commercially released.

### Q: What company developed the Alpha 21464?
A: The microprocessor was developed by Digital Equipment Corporation (DEC), a major player in computer hardware.

### Q: What made the Alpha 21464 notable?
A: It was part of the Alpha series, a line of high-performance RISC-based microprocessors, and was intended to succeed the Alpha 21364.

## Why It Matters
The Alpha 21464 holds significance as a planned evolution of DEC’s Alpha microprocessor architecture, a family known for its high-performance RISC design. Although it was never completed, its development reflects DEC’s efforts to maintain competitiveness in the microprocessor market during the 1990s and early 2000s. The Alpha series influenced the broader computing industry, particularly in enterprise and scientific computing, and the 21464’s unfinished status underscores the challenges faced by DEC in sustaining its processor roadmap amid market shifts. Understanding the 21464 provides insight into the trajectory of RISC architecture and the strategic decisions of a major hardware developer.

## Notable For
- **Unfinished Successor**: The Alpha 21464 is notable for being an uncompleted follow-up to the Alpha 21364, highlighting the complexities of microprocessor development.
- **Alpha Lineage**: Part of the Alpha series, which was renowned for its performance in RISC-based computing.
- **DEC Heritage**: Developed by Digital Equipment Corporation, a company pivotal in early computing innovation.

## Body
### Development Context
The Alpha 21464 was designed by Digital Equipment Corporation (DEC) as a successor to the Alpha 21364 microprocessor. It was part of the Alpha series, which utilized reduced instruction set computing (RISC) architecture to achieve high performance. The 21464 was intended to extend the capabilities of its predecessor but remained in an unfinished state.

### Technical Lineage
- **Predecessor**: The Alpha 21364, a microprocessor known for its integration of on-chip memory controllers and high-speed interconnects.
- **Architecture**: The Alpha instruction set architecture (ISA) emphasized simplicity and scalability, principles that would have guided the 21464’s design.

### Legacy
Despite its unfinished status, the Alpha 21464 represents a milestone in DEC’s efforts to advance its microprocessor technology. The Alpha series, including the conceptual 21464, influenced later processor designs and remains a subject of study in computer architecture. The project’s termination also reflects broader industry challenges, including competition from x86 and other RISC architectures like SPARC and PowerPC.