Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!uakari.primate.wisc.edu!uflorida!gatech!ncsuvx!mcnc!duke!cello!jfw
From: jfw@cello.mc.duke.edu (John Whitehead)
Newsgroups: comp.sys.mac.misc
Subject: Solved! was Re: Help!  SE monitor has checkerboard pattern & hangs
Message-ID: <21683@duke.cs.duke.edu>
Date: 17 Oct 90 19:47:43 GMT
References: <21674@duke.cs.duke.edu>
Sender: news@duke.cs.duke.edu
Reply-To: jfw@neuro.duke.edu (John Whitehead)
Organization: Duke University Medical Center -- Durham, NC
Lines: 20
Nntp-Posting-Host: cello.cellbio.duke.edu

In article <21674@duke.cs.duke.edu> jfw@neuro.duke.edu (me) wrote:

>I was doing memory upgrades...
>
>The SE's monitor is a checkerboard pattern (16 across by 10-1/2 down)
>upon bootup... then nothing else happens.

I have fixed the problem, thanks to all who responded so quickly.

I had the 256K RAM chips where the 1 MB chips should have been, and vice
versa.  Apparently, an SE with resistors needs the 1MB chips in slots
1&2, but an SE with jumpers needs the 1MB chips in slots 3&4.  I had been
working on both yesterday; I didn't know they were different.  To make
matters more confusing, my memory installation manual says the latter
in the text, but has the former in the diagram.

    John Whitehead	               Internet:  jfw@neuro.duke.edu
    Department of Neurobiology                    jfw@well.sf.ca.us
    Duke University Medical Center     Bitnet:    white002@dukemc           
    Durham, North Carolina