metal pin. side. There appears to be some question as to whether thyy are cast in place, or inserted. Actually, I started to wonder about my assertion shortly after I posted it, and took another look at the backplane. The thing is that the hollows that the finger contact pins are in are fairly complicated (since they allow the contact pins to move back and forth, but hold them from going too far), and I'm really wondering if it would be possible to cast that shape, and then remove the mold, and also have the pin in there. So I'm wondering if in fact they weren't inserted post-casting. Well, I'm kind of assuming they are inserted from the edge-connector side, and not the wira-wrap pin side (what with the contact pins being bent, etc on the edge-connector side), If they _were_ inserted from the wire-wrap pin side, I'm totally @&@^$#%@&^, there's no way to get that PCB off now. So in theory, at least, I'd have to de-solder them from the PCB and then try and push the remaining part back through (after identifying and defeating whatever the capture mechanism is - which I might not be able to reach with the PCB in the way). And then I'd have to find replacement pins and put them in. Both of those sound non-trivial. (All assuming, of course, that they are inserted post-casting, and not cast into place... still not sure about that.) This has assumed a little extra urgency as on closer examination, some of the pins in the UNIBUS in-out area are clearly very weak - I imagine there's only a tiny bit of metal holding the contact pin in place, and it could break off any time. And I won't be so lucky as to have them all be ground pins.. So if one breaks off, the backplane is toast (unless it's the the last thing on the UNIBUS, it could be kludged - i.e. attach the termination/ pull-up directly to the wire-wrap pin). Which I guess is not the end of the world - DD11's aren't _that_ rare... Noel