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From: dafa@ihwpt.UUCP (David Fay)
Newsgroups: net.micro.mac
Subject: Re: Re: 1.5 Meg Upgrade from MacMemory
Message-ID: <536@ihwpt.UUCP>
Date: Tue, 29-Oct-85 12:37:02 EST
Article-I.D.: ihwpt.536
Posted: Tue Oct 29 12:37:02 1985
Date-Received: Wed, 30-Oct-85 07:20:15 EST
References: <501@ihwpt.UUCP> <2092@amdahl.UUCP> <509@ihwpt.UUCP> <523@ihwpt.UUCP> <240@well.UUCP> <7807@apple.UUCP>
Distribution: net
Organization: AT&T Bell Laboratories
Lines: 26

Thank you Donald North for clarifying how screen memory location is
determined. One small correction - screen memory on the 128K is at
$1A700 not $3A700.

We have now installed our first MacMemory 1.5 Meg upgrade on top of
an Apple 512K board. It was not a difficult job, requiring about the
same level of skill as a 512K upgrade. Three ICs must be de-soldered
on the mother board along with some other minor modifications. Less
work is required on a 128K board which has been upgraded to 512K.
The MacMemory board appears to be of high quality - at least as good
as the Apple board itself. We can not detect any increase in heat
coming out of the vents on top.

The materials that come with the kit state that the upgrade is to be
added to stock Apple boards with soldered (not socketed) RAM.
Apparently this is because MacMemory believes socketed memory is not as
reliable as soldered. Throwing all caution to the wind, our next
upgrade will be on a homebrew 512K upgrade with low profile sockets.
We have already determined that there is plenty of clearance for the
daughter board even with the socketed memory.
-- 
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David Fay
AT&T Bell Laboratories
Naperville, IL 60566
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