From: utzoo!decvax!cca!hplabs!hao!menlo70!sytek!gi!arizona!kpno!stevens@sri-unix
Newsgroups: net.unix-wizards
Title: 750 machine check 2
Article-I.D.: kpno.114
Posted: Thu Oct 28 08:13:25 1982
Received: Sun Oct 31 06:47:36 1982

We have had the machine check 2 problem with two 11/750's running 4.1bsd.
We called DEC last week and they say that the problem is known but it is not
an official ECO.  Apparently they have used two different manufacturer's
chips on one of the CPU boards and one of the two is "noisier" than the
other.  They are coming out to check both of our systems and will replace
the chip if it is from the "noisy" source.  (Our local DEC field service
tracked this down within DEC and found someone who was "very knowlegable
about UNIX").  Changing the board with another containing the same chip
will probably not solve anything.

Also, the October 1982 "*UNIX softalk" (a new rag that I got unsolicited)
from "international data services" (408-730-unix) has some info on this
and they claim to have a software patch for 4.1bsd.  They have sent me
the info, but I havent received it yet.
	Rich Stevens, Kitt Peak National Observatory