I found 2 of these Audio ReQuest computers at a thrift store. At first I wanted to know what they were, and when I saw the keyboard port in the back I started to wonder if these were computers, and for $20 each I took a chance back in 2017.
They run a custom OS for media playback. The unit has a CD rom drive built in the front to load media onto, and a removable hard drive.
The company ReQuest designs and makes media servers, and is still in business since 1998. I believe this type of unit would play music in a store, restaurant, or other business. Could also be used for video files on a display or sign.