# RCA CDP1861

> integrated circuit Video Display Controller

**Wikidata**: [Q4047814](https://www.wikidata.org/wiki/Q4047814)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/RCA_CDP1861)  
**Source**: https://4ort.xyz/entity/rca-cdp1861

## Summary
The RCA CDP1861 is an integrated circuit video display controller developed by RCA Corporation in 1977. It is part of the video display controller class of integrated circuits and was used in systems like the COSMAC ELF and Telmac 1800.

## Key Facts
- **Type**: Integrated circuit model, specifically a video display controller
- **Developer**: RCA Corporation
- **Inception**: 1977
- **Used by**: COSMAC ELF, Telmac 1800, RCA Studio II
- **Instruction set**: 8-bit computing
- **Aliases**: RCA CDP1864, CDP1861, CDP1864, CDP 1861, CDP 1864
- **Manufacturer**: RCA Corporation
- **Class**: Video display controller (subclass of integrated circuit)
- **Wikipedia presence**: Available in English, Russian, and Swedish

## FAQs
### Q: What was the RCA CDP1861 used for?
A: The RCA CDP1861 was an integrated circuit video display controller used in systems like the COSMAC ELF, Telmac 1800, and RCA Studio II.

### Q: Who developed the RCA CDP1861?
A: The RCA CDP1861 was developed by RCA Corporation and manufactured by the same company.

### Q: What type of computing did the RCA CDP1861 support?
A: The RCA CDP1861 supported 8-bit computing.

### Q: What are the known aliases for the RCA CDP1861?
A: The RCA CDP1861 is also referred to as RCA CDP1864, CDP1861, CDP1864, CDP 1861, and CDP 1864.

### Q: Is the RCA CDP1861 documented in Wikipedia?
A: Yes, the RCA CDP1861 has Wikipedia entries in English, Russian, and Swedish.

## Why It Matters
The RCA CDP1861 was a significant integrated circuit in the early days of microcomputing, particularly in systems like the COSMAC ELF and Telmac 1800. As a video display controller, it played a crucial role in enabling visual output for these systems, which were popular in the 1970s and early 1980s. Its development by RCA Corporation contributed to the broader advancements in integrated circuit technology during that era. The CDP1861’s support for 8-bit computing further aligned with the growing trend of 8-bit microprocessors, making it a key component in early home computing and educational systems. While not as widely recognized as some other integrated circuits, the RCA CDP1861 remains an important piece of hardware history, reflecting the technological innovations of its time.

## Notable For
- **Early microcomputing support**: One of the first integrated circuit video display controllers used in popular 8-bit systems.
- **RCA Corporation development**: Designed and manufactured by RCA, a major player in electronics during the 1970s.
- **Multiple system compatibility**: Used across different systems, including the COSMAC ELF, Telmac 1800, and RCA Studio II.
- **8-bit computing**: Supported 8-bit computing, aligning with the dominant trend in early microprocessors.
- **Historical significance**: A key component in the evolution of integrated circuit technology and early home computing.

## Body
### Overview
The RCA CDP1861 is an integrated circuit video display controller developed by RCA Corporation in 1977. It is classified as a video display controller, a type of integrated circuit used to manage visual output in computing systems.

### Technical Specifications
- **Instruction set**: 8-bit computing
- **Aliases**: RCA CDP1864, CDP1861, CDP1864, CDP 1861, CDP 1864
- **Manufacturer**: RCA Corporation

### Applications
- **Used by**: COSMAC ELF, Telmac 1800, RCA Studio II
- **Role**: Enabled visual output for early microcomputing systems

### Historical Context
- **Inception**: 1977
- **Developer**: RCA Corporation
- **Wikipedia presence**: Available in English, Russian, and Swedish

### Classification
- **Instance of**: Integrated circuit model
- **Subclass of**: Video display controller

The RCA CDP1861 was a crucial component in early microcomputing systems, supporting 8-bit computing and contributing to the development of integrated circuit technology. Its use in systems like the COSMAC ELF and Telmac 1800 highlights its importance in the early days of home computing.