My dad has this audio interface from the 90s called the Media Vision Pro AudioSpectrum 16 Patch Panel, but unfortunately doesn't have the manual. From my research, it appears that this panel was used to interface with the sound card of the same name in old Apple computers (which my dad owned in the 90s). The function is clear for every port on it except this one, which is on the side and appears to be intended to connect to the computer itself. However, the Pro AudioSpectrum sound card doesn't appear to have a DA-26 port! I can't find any helpful information about this patch panel or any relevant use for a DA-26 connector. I've attached an image and I'd be grateful if anyone could provide any relevant information. Thanks!