Thanks so very much to all who replied!? And Bob - thanks for having that option - I may still need to do that.? I was able to get a board on the way from Daniel Nelson - he found one that needs some work, but at least that's much more than what I have now.
This motherboard will definitely need some love, as it's pretty ate up with electrolyte in that edge where the A80 board lives.? The card-edge connector for the A80 is toast, and I wouldn't doubt if some of the other ones in that vicinity are bad as well.? I'll be removing the board and doing the standard scrub & soak in an acidic solution, followed by an alkaline bath, then rinsing with clean water.? I've had good luck cleaning things of this nature before by doing that, so hopefully this will work as well.
I'm sure I'll have some other questions along the way, but thank you all again who replied!