Wow, that's new to me. This is a completely different issue than the one with the Seagate drives. In fact I'm sure I've never heard of CMI (not the same as CMS, a third party supplier of PS/2 SCSI hardware).
Our ATs were delivered in early 1985 - when did the very first IBM AT ship?
We used our AT as a network server way back then - a real, original IBM NETBIOS network.