What connector was designed to connect your PC a high-end audio system?

The connector that was designed to connect your PC to a high-end audio system is the S/PDIF connector. S/PDIF stands for Sony/Philips Digital Interface Format, and it is a standard for transmitting digital audio between devices.

The S/PDIF connector is typically coaxial or optical, and it allows for the transmission of stereo audio signals at a sampling rate of up to 192 kHz and a resolution of up to 24 bits. S/PDIF is often used to connect PCs to external sound cards and digital-to-analog converters (DACs) to improve the quality of the audio output.