I can not say I know and I would suspect they peed on it in some manner, that was the DEC culture.  I've just sent a note to Mr. BI to see if he knows and I'll pass back anything I learn if I do.  Sounds like the sort of thing they might have gotten changed before it was release.

I'm pretty sure we had some stuff from WD at CMU, because CM* was made out of a lot of them, and CMU did custom microcode so they could talk to the capabilities and K.map HW.  I remember seeing some prints with WD markings on it, but I was not heavily involved other than working the new distributed front-end which we did with LSI-11s. 

Somebody from the CMU HW lab like Jim Teter might know, although he did the 11/40e for C.mmp, I'm not sure who was the microcode guru on CM*  as that was all happening as I was leaving.  I sent a couple of emails to folks like Danny Klein, Mike Liebensberger, and Tron McConnell. Danny and Mike are SW folks, Tron was a EE/HW type but mostly worked on other stuff at Mellon Institute in those days.    But, IIRC, Tron was worked on a 3Mbit Xerox board for the LSIs, so he might have had something.   We all did some stuff with CM* (Mike more than any of us). FWIW: Tron was (is) a bit of packrat and if he ever had anything like that, he might still have it.