The Analog Devices AD1985 is an audio codec (Coder-Decoder) that was commonly integrated into motherboards and sound cards in the early 2000s. This audio chip offered high-quality audio processing and playback capabilities for desktop and server systems. The AD1985 supported features like 5.1 channel surround sound, providing users with immersive audio experiences for gaming, multimedia, and general computing. It was known for its clarity and fidelity of audio output. As technology has advanced, the AD1985 has become less common in modern systems, but it played a significant role in delivering robust audio functionality during its era, contributing to a generation of computer users' audio enjoyment.