# MOS Technology 6522

> integrated circuit

**Wikidata**: [Q583531](https://www.wikidata.org/wiki/Q583531)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/MOS_Technology_6522)  
**Source**: https://4ort.xyz/entity/mos-technology-6522

## Summary
The MOS Technology 6522 is an integrated circuit model widely known as the Versatile Interface Adapter (VIA). Manufactured by MOS Technology, it functions as a chipset and timer designed to manage data flow between the processor, memory, and peripherals. It operates using memory-mapped I/O within 8-bit computing architectures.

## Key Facts
- **Also Known As**: Versatile Interface Adapter (VIA).
- **Manufacturer**: MOS Technology.
- **Classification**: Instance of an integrated circuit model; subclass of chipset and timer.
- **Primary Function**: Manages data flow between the processor, memory, and peripherals.
- **Operation Mode**: Uses memory-mapped I/O.
- **Architecture**: Designed for 8-bit computing.
- **Pinout Configuration**: Features a 40-pin layout (partial list sourced) including GND (Pin 1), Port A pins PA0–PA7 (Pins 2–9), and Port B pin PB0 (Pin 10).
- **Visual Resources**: Schematics and images are available on Wikimedia Commons under the category "MOS Technology 6522."
- **Identifiers**: C64 Wiki ID is "VIA"; Wikidata description is "integrated circuit."

## FAQs
### Q: What does the acronym VIA stand for in relation to this component?
A: VIA stands for Versatile Interface Adapter, which is the functional alias for the MOS Technology 6522 integrated circuit.

### Q: What are the primary functions of the MOS Technology 6522?
A: It serves as both a chipset and a timer. As a chipset, it manages data flow between the processor, memory, and peripherals, while as a timer, it functions as a microcontroller in computer engineering.

### Q: How is the MOS Technology 6522 interfaced in a computer system?
A: The device utilizes memory-mapped I/O, allowing the processor to communicate with it by reading from and writing to specific memory addresses.

## Why It Matters
The MOS Technology 6522 is a significant component in the field of 8-bit computing and computer engineering. By integrating the functions of a chipset and a timer into a single integrated circuit, it streamlines the management of data flow between the central processor, system memory, and external peripherals. This integration is essential for efficient system operation, reducing the complexity of the motherboard and the need for discrete logic components. Its classification as a "Versatile Interface Adapter" underscores its utility in providing flexible input/output options for early personal computers and embedded systems. The chip's specific pin configuration, featuring distinct ports (Port A and Port B), allows for robust connection and control of hardware devices, cementing its role as a standard building block in vintage computing architectures.

## Notable For
- **Dual Classification**: Distinctly classified as both a chipset and a timer, serving dual roles in data management and microcontroller timing.
- **Versatile Interface**: Known as the Versatile Interface Adapter (VIA), highlighting its adaptability in connecting different hardware components.
- **8-Bit Architecture**: Specifically engineered to support 8-bit computing instruction sets.
- **I/O Management**: Utilizes memory-mapped I/O, a standard method for efficient CPU-to-peripheral communication.
- **Port Structure**: Features dedicated I/O ports (Port A and Port B), exemplified by its standardized pinout configuration.

## Body

### Manufacturer and Classification
The MOS Technology 6522 is an integrated circuit model manufactured by MOS Technology. In the hierarchy of electronic components, it is classified as a subclass of both a **chipset** and a **timer**.
*   **Chipset Role**: It functions as a set of electronic components that manages data flow between the processor, memory, and peripherals.
*   **Timer Role**: It operates as a microcontroller used in computer engineering contexts.

### Technical Specifications
The component is designed for **8-bit computing** architectures and operates via **memory-mapped I/O**.
*   **Pinout Configuration**: The physical interface consists of a specific arrangement of pins. The first ten pins are defined as:
    *   **Pin 1**: GND (Ground)
    *   **Pin 2**: PA0 (Port A, Bit 0)
    *   **Pin 3**: PA1 (Port A, Bit 1)
    *   **Pin 4**: PA2 (Port A, Bit 2)
    *   **Pin 5**: PA3 (Port A, Bit 3)
    *   **Pin 6**: PA4 (Port A, Bit 4)
    *   **Pin 7**: PA5 (Port A, Bit 5)
    *   **Pin 8**: PA6 (Port A, Bit 6)
    *   **Pin 9**: PA7 (Port A, Bit 7)
    *   **Pin 10**: PB0 (Port B, Bit 0)

### Nomenclature and Identifiers
The device is primarily identified by the model number **6522**, but is widely referred to by the alias **Versatile Interface Adapter** or the acronym **VIA**.
*   **Wikidata**: Described generally as an "integrated circuit."
*   **C64 Wiki**: Indexed under the ID "VIA."
*   **Wikimedia Commons**: Images and schematic files are categorized under "MOS Technology 6522," including specific pinout diagrams.

## References

1. Freebase Data Dumps. 2013