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Article #29

Mac II video Card Upgrade Info and Query

#29
From: Clark N. Quinn
Date: Mon, 11 Sep 1995 00:00
42 lines
2426 bytes
After living for years with 16 greys/colours, I finally decided to upgrade
to 256 (thank you, Realmz).  Yes, this is a real Mac II, no x or anything
else (well, I got the PMMU, and thermostatically controlled fan, but not
even the SuperDrive upgrade tho' I wouldn't mind), with the original Mac
II video card, which was always designed to be upgradeable.  Apple
declined on providing the upgrade, so I was on my own. 

I had no luck finding the necessary chips here in Oz (8 x 41264's, which
are 24 pin dual ported video RAM), but while visiting the US I saw an ad
for a chip company that promised they would have them.  Well, it took two
tries (the first time they sent the wrong chips) and some external
support, but Memory Direct (+1-714-847-5532, Fax +1-714-842-9437) finally
got them to me.  I popped them in and the card works fine.  

In 16 greys/colours.  Hmmph.

I think what's up is that I need to signal to the card that I've added the
chips.  I presume that there's a connection or resistor I need to break,
or a connection needs to be made.  

One suspicion: there's a double triangle of solder that looks like just
dragging a soldering pencil tip across it would create such a join...

   /\
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Alternatively, can anyone state definitively just WHAT extra needs to be
done?  Your help would be greatly appreciated.  Thanks, -- Clark

--------------------------------------------------------------------
 _--_|\   Dr. Clark N. Quinn
/      \  School of Computer Science and Engineering  +61-2-385-3985
\_.--._*  The University of New South Wales       Fax +61-2-385-5995
      v   Sydney NSW 2052                        C.Quinn@unsw.edu.au
          AUSTRALIA                          cnquinn@cse.unsw.edu.au

          "A California Yankee in the Land of Oz"
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From: C.Quinn@unsw.edu.au (Clark N. Quinn)
Subject: Mac II video Card Upgrade Info and Query
Date: 1995/09/11
Message-ID: <C.Quinn-1109951014130001@129.94.246.116>
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organization: University of New South Wales
newsgroups: comp.sys.mac.hardware.video,aus.computers.mac