A friend bought this for me over 20 years ago from Akizuki Denshi, but I'm not very knowledgeable about electronics and never assembled it. I don't think I can answer any questions about the contents. It appears to have an optical connector. #AkizukiDenshi #SCMS #DAT #MD (Due to limited storage space, I plan to dispose of it if it doesn't sell by September 30th)