Looking for a favor from Poly-8813 owners. Take a look at your CPU board, video board, and RAM boards and see if any of them have a wire as part of a mod that is tacked onto bus pin 16. The CPU board actually has a very short trace and feed-thru attached to pin 16, so look for a wire on the backside attached to that feed-thru. On the other boards, you’ll look for a wire attached directly to bus pin 16. If you have any boards with these mods, let me know. Thanks!