This is a Yamaha XG card, the SW60XG to be exact ... but it is interesting to see it used as a standalone device. [Benji Kimba] posted the video overview of his project which you can watch ...
If you were to see Yamaha’s R-N800A on a hi-fi rack it would be easy to assume that it was simply another one of the company’s slightly retro-looking but ever-so-classy stereo amplifiers.