1. That is exactly right, terminations on CPUA and CWI only.
2. That sounds really high, that's from a brand new CPUA? I have replaced CPUA cards for less variation than that (and solved the problem.). Now I'm curious what a good CPUA would measure without anything plugged in at all.
3. So you couldn't get a 16 bit CPU from Thyssen? Obsolete? Did they cut a deal on the 32 bit upgrade? I have never done it myself although I pushed really hard for it on a job with way too many I/Os for 16 bit. I think they offered to supply the hardware.