Thread View: comp.sys.mac.hardware.video
2 messages
2 total messages
Started by Clark N. Quinn
Mon, 11 Sep 1995 00:00
Mac II video Card Upgrade Info and Query
Author: Clark N. Quinn
Date: Mon, 11 Sep 1995 00:00
Date: Mon, 11 Sep 1995 00:00
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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
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_--_|\ 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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Re: Mac II video Card Upgrade Info and Query
Author: David Richardson
Date: Mon, 11 Sep 1995 00:00
Date: Mon, 11 Sep 1995 00:00
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In article <C.Quinn-1109951014130001@129.94.246.116> C.Quinn@unsw.edu.au (Clark N. Quinn) writes: >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. You do NOT need to tell the card - it automatically senses how much memory it has. I did the same thing a year ago, and you must push the chips in HARD. When I first did it, they went in only partially and thus they, effectively, weren't there. Didn't I feel silly when I was shown that... Go push them in further! ================================================================ David "Lord" J Richardson djric3@eng3.eng.monash.edu.au << Insert witty comment >> borad@yoyo.cc.monash.edu.au
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