The VIA VT82C686B is a south bridge chip that provides a comprehensive range of I/O functions for PC systems. It works in conjunction with a north bridge chip (such as a VIA Apollo chipset) to form the core logic of a motherboard. The VT82C686B manages slower peripheral connections, allowing the north bridge to focus on high-speed data transfers.

Applications

• Desktop PCs
• Workstations
• Embedded systems

Features

• Integrated PCI Bus Master IDE controller with Ultra DMA 33/66 support: Enables fast data transfer between the hard drive and the system.
• Integrated Super I/O controller: Provides support for legacy I/O devices like serial and parallel ports.
• AC'97 audio controller: Supports high-quality audio output.
• Integrated USB controller: Supports Universal Serial Bus (USB) connections for peripherals. Typically supports USB 1.1.
• Power Management: Supports Advanced Power Management (APM) for energy saving.
• Real-Time Clock (RTC): Provides timekeeping functionality.

Benefits

• Enhanced System Performance: The Ultra DMA support allows for faster hard drive performance, leading to quicker loading times for applications and data.
• Legacy Device Support: Integrated Super I/O ensures compatibility with older serial and parallel port devices.
• Improved Audio Experience: The AC'97 audio controller delivers clear and crisp audio output.
• Peripheral Connectivity: USB support allows connection of a wide range of modern peripherals.
• Reduced Power Consumption: Power management features help to conserve energy.
• Cost-Effective Solution: Integrates multiple functions into a single chip, reducing overall system cost.

The VT82C686B typically interfaces with the north bridge via the PCI bus. It's a key component for enabling a wide range of I/O functions in older PC systems. Its support for legacy devices and power management features make it a versatile and reliable south bridge solution. This chip provides a stable and feature-rich platform for various computing needs, particularly in systems where compatibility with older peripherals is required.