> This is documented.
 > 
 > All of the 21164's with a -Pn designation are the "NT only" versions of the
 > 21164.  However, it wasn't untill the -P7 that the "NT only" nature of the
 > "NT only" processors began to be enforced.


This problem has nothing whatsoever to do with NT-vs-OSF chips. My current
working hypothesis is that it is due to EV5 OK, EV56 !OK palcode. Since we
have the palcode source, we will locate this bug eventually.