So I'm on a toslink roll. I ended up doing a saturn and dreamcast install yesterday. Refer to this thread for parts and more info: http://assemblergames.com/l/threads/700x-ps1-toslink-success.57639/ I have a launch model V-Saturn, and this tutorial assumes you have a TDA1386T DAC chip in your saturn (Its located by the the video out connector) I got my feeds from some test points on the back side of the board close to the power connector. It was just easier to solder then going directly on the chip. Also Pin 7 on the TC9231N should get +5 PCB mounting and wiring routing. I used the factory hole to mount the toslink connector. I did have to do some trimming on the top panel around the power supply. All done On to the dreamcast. Check to make sure your dreamcast DAC is a PCM1725. I couldn't really find any convenient test points like the saturn so I just soldered directly to the DAC. I also pulled power from here but you could source GND and +5 from anywhere on the board. Also Pin 7 on the TC9231N should get +5 Next I'm going to try and figure my 3DO, but I need to get some more boards in.