Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!mailrus!iuvax!pur-ee!pur-phy!maxwell.physics.purdue.edu!sho
From: sho@maxwell.physics.purdue.edu (Sho Kuwamoto)
Newsgroups: comp.sys.mac.hardware
Subject: Summary: PMMUs vs Mac IIs -- which ones don't work
Message-ID: <3092@pur-phy>
Date: 9 Feb 90 08:50:26 GMT
Sender: news@pur-phy
Reply-To: sho@maxwell.physics.purdue.edu.UUCP (Sho Kuwamoto)
Organization: Purdue Univ. Physics Dept., W. Lafayette, IN
Lines: 14

Thanks to all who replied.
From the info received, and a call to my local Apple dealer, it
seems the following is the case:

Certain Mac IIs *are* defective, in that a PMMU cannot be plugged
in.  Symptom?  When the machine is booted, the screen goes blank.
Apple will provide a free motherboard swap.  

You machine will be affected if you have Rev. A ROMs.  They moved
to Rev. B ROMs sometime around February 1988.

-Sho
--
sho@physics.purdue.edu  <<-- the public should know.