I'm trying to resurrect an old enhanced IIe. So far, I've gotten everything working again, except for the Super Serial Card. I'm able to run a few diagnostic tools, all of which see it as an unknown card. APEX II sees it as: 44 80 168 184 56. The correct values for an SSC are 44 80 169 184 56, so it's only off by one. I'm wondering if it might be one bad chip on the board somewhere I could replace. I have a second old IIe motherboard, which I've already used to cannibalize parts and repair a bad RAM chip on the 80col card.
Any ideas? While the SSC isn't working, I can sideload disk images with ADT and audio cables (hence why I want to get the SSC running!) Any tips on what to try next?