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Path: utzoo!mnetor!seismo!rutgers!mit-eddie!think!ames!lll-tis!ohlone!ojibwa!tds
From: tds@ojibwa
Newsgroups: comp.sys.m6809
Subject: CoCo 3 memory upgrade
Message-ID: <16800005@ojibwa>
Date: Tue, 26-May-87 21:56:00 EDT
Article-I.D.: ojibwa.16800005
Posted: Tue May 26 21:56:00 1987
Date-Received: Fri, 29-May-87 06:06:06 EDT
Lines: 18
Nf-ID: #N:ojibwa:16800005:000:930
Nf-From: ojibwa!tds    May 26 18:56:00 1987


Hi!

   Just a quick tip to fellow do-it-yourself-ers out there.  If you're doing
your own 512K upgrade for the CoCo 3, DON'T push the expansion board down
all the way.  It seems the sockets don't have a bottom on them, and the
pins can push all the way down onto the board and short to traces!  I've
seen warnings like this around, but they seemed to say that the problem
was that you might contact the tops of the electrolytic caps, which, on my
board are actually quite a ways down.  So, being the fool i am, i just plugged
it in good and snug.  Worked fine for a while, then started going thermal 
sensitive.  Ha! I says, the memory board must have loosened up, so i pulled
it out, pressed the memory chips in tighter, and put the board back in.
Ulp! Video garbage.  I wish i could say i figured it out then, but it took
16 new ram chips to bring the point home.  Oh well, at least i didn't short
+5 to ground!

tim sirianni