@mbrantly
I just looked through my Toaster paperwork and found a pinout for a Toaster 2000/Flyer/YCPlus S-video board cable which looks like it just piggy backs the YCPlus connector onto the Toaster 2000/Flyer cable when I compare it to the photo Plaz posted. I've got to rush off to a meeting that I don't really want to go to right now but I'd be happy to scan it for you. Even better, I know I once made one of these cables and if I can find it and it's in usable shape, I'd be happy to send it to you for $5, shipping included.
Send me a PM. I'll be home this evening.