Path: utzoo!mnetor!uunet!husc6!uwvax!rutgers!princeton!phoenix!pswisnov
From: pswisnov@phoenix.Princeton.EDU (Peter S. Wisnovsky)
Newsgroups: comp.sys.mac
Subject: Re: HELP--RAM Upgrade Causing Monitor Interference
Message-ID: <1412@phoenix.Princeton.EDU>
Date: 23 Dec 87 20:11:26 GMT
References: <151@umn-d-ub.D.UMN.EDU>
Reply-To: pswisnov@phoenix.Princeton.EDU (Peter S. Wisnovsky)
Organization: Princeton University, NJ
Lines: 15
Keywords: Dove Dr. Dobb's memory upgrade


I installed a similiar upgrade to my 512e. After experiencing some problems,
I called Dove: they were very helpful, and said that most problems relating
to memory failing (Note: get the 2 megabyte memory test from your nearest
mac archive) related to a mismatch in the timings of the chips (I believe
if the chips on your motherboard are 200ns one must solder in a 47Ohm
resistor parallel to r10 (I had to do this) but since I am going from
memory don't trust me on it) or that the voltage on the power supply
was off (it should be between 4.90 and 4.92 volts: I also had to change this.)

The upgrade has been fine since then.
-- 
Peter Wisnovsky		pswisnov@phoenix.princeton.edu   BitNet: pswisnov@pucc

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