# 1858 series integrated circuits

> series of Soviet Z80-compatible microprocessors

**Wikidata**: [Q115859582](https://www.wikidata.org/wiki/Q115859582)  
**Source**: https://4ort.xyz/entity/1858-series-integrated-circuits

## Summary
The 1858 series integrated circuits are a Soviet series of Z80-compatible microprocessors, including models like the T34VM1 and T34VG1. These chips were designed for use in home computers and video games, adhering to Soviet integrated circuit designation standards.

## Key Facts
- **Class**: Integrated circuit series, clone, second-order class
- **Based on**: Zilog Z80 architecture
- **Manufacturers**: Angstrem, Transistor, VSP Mikron (under ВЗПП Электроника)
- **Country of origin**: Soviet Union, Russia
- **Instruction set**: 8-bit computing
- **Applications**: Home computers, video games
- **Compliance**: Soviet integrated circuit designation
- **Subclass**: Second source
- **Components**: Includes T34VM1 and T34VG1 microprocessors
- **Image**: [KL_USSR_T34BM1_Z80.jpg](https://commons.wikimedia.org/wiki/Special:FilePath/KL_USSR_T34BM1_Z80.jpg)

## FAQs
### Q: What was the purpose of the 1858 series integrated circuits?
A: The 1858 series was developed as Soviet Z80-compatible microprocessors for use in home computers and video games, bypassing Western licensing restrictions.

### Q: Which companies manufactured the 1858 series?
A: The series was produced by Angstrem, Transistor, and VSP Mikron (under ВЗПП Электроника), key Soviet electronics manufacturers.

### Q: How does the 1858 series relate to the Z80?
A: The 1858 series is a clone of the Zilog Z80, maintaining compatibility while being produced domestically in the Soviet Union.

### Q: What are the key models in the 1858 series?
A: The T34VM1 and T34VG1 are the primary 8-bit microprocessors in the series, designed for embedded systems.

### Q: Where can I find images of the 1858 series?
A: An example image is available on Wikimedia Commons: [KL_USSR_T34BM1_Z80.jpg](https://commons.wikimedia.org/wiki/Special:FilePath/KL_USSR_T34BM1_Z80.jpg).

## Why It Matters
The 1858 series integrated circuits played a crucial role in Soviet electronics by providing a domestically produced alternative to the Z80, which was restricted under Western licensing agreements. These microprocessors enabled the development of home computers and video games in the USSR, contributing to the country’s technological independence. By adhering to Soviet integrated circuit designation standards, the series ensured compatibility with existing systems while meeting local manufacturing requirements. This initiative reflected the broader Soviet strategy of reducing reliance on foreign technology, particularly in the semiconductor industry.

## Notable For
- **Domestic Z80 Clone**: First Soviet-produced Z80-compatible microprocessor, crucial for Soviet electronics.
- **Soviet Designation Compliance**: Followed Soviet integrated circuit designation standards for local production.
- **Embedded Applications**: Used in home computers and video games, supporting Soviet tech development.
- **Manufacturing Diversity**: Produced by multiple Soviet manufacturers, including VSP Mikron.
- **8-Bit Architecture**: Maintained Z80’s 8-bit instruction set while ensuring Soviet compatibility.

## Body
### Overview
The 1858 series is a Soviet-developed series of integrated circuits based on the Zilog Z80 architecture. These chips were produced domestically to avoid Western licensing restrictions, enabling their use in home computers and video games.

### Technical Specifications
- **Instruction Set**: 8-bit computing, compatible with Z80.
- **Manufacturers**: Angstrem, Transistor, and VSP Mikron (under ВЗПП Электроника).
- **Compliance**: Followed Soviet integrated circuit designation standards.

### Key Models
- **T34VM1 and T34VG1**: Primary 8-bit microprocessors in the series, designed for embedded systems.

### Applications
- **Home Computers**: Used in Soviet home computer systems.
- **Video Games**: Supported Soviet video game development.

### Significance
- **Technological Independence**: Enabled Soviet electronics development without Western licensing.
- **Manufacturing**: Produced by multiple Soviet manufacturers, ensuring domestic supply.

### Media
- **Image**: [KL_USSR_T34BM1_Z80.jpg](https://commons.wikimedia.org/wiki/Special:FilePath/KL_USSR_T34BM1_Z80.jpg) shows an example of the 1858 series.