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Author Topic: Memory upgrade for A1200  (Read 2489 times)

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Offline Xamiche

Re: Memory upgrade for A1200
« on: April 10, 2008, 08:53:36 PM »
I'm selling a Microbotics 8MB RAM board on eBay at the moment. Not sure where in the world you are though. It might be too far for you.

I believe there's a fix for the PCMCIA problem when using an expansion. I'll see if I can track down what needs to be done.

Edit: I didn't make this. It's from Aminet. I have never done this modification so I cannot tell you if it works, but I heard of others doing it. I believe AmiKit even has a product that will fix the PCMCIA reset issue with a socket that clips over the Gayle chip.

Quote
The A1200 (and A600?) PCMCIA-port has a bug which causes some PCMCIA-cards
(especially ethernet-cards) not to work after hardreset until you remove
the card and insert it again while power is on.

It seems as if the A1200 is not generating any reset-signal for the PCMCIA-
port. The problem is easily solved by soldering a 10uF capacitor between
CC_RESET and and Vcc. The CC_RESET is active high. The cathode (-) of the
capacitor should be at CC_RESET.

CC_RESET can be found on pin 5 of Gayle (U5) and Vcc on R715A (the end which
is near Gayle).

WARNING!
Although this is a very simple thing to solder please consult a professional
if you are not good at soldering. I take no responsibility for any damages
caused by doing anything described in this file.


Thanks to
---------
Filip Kopec   for making the A1200info series.

Author
------
Pontus Fuchs
email: pontus.fuchs@bluechoice.se
homepage: http://foo.birdnet.se/~pf/

A500, A600, A1200, A2000, A4000D, A4000T, CD32
 

Offline Xamiche

Re: Memory upgrade for A1200
« Reply #1 on: April 10, 2008, 09:14:06 PM »
Ahh, I see.

I'm not sure if my Microbotics board conflicts in the way that you've mentioned. I had no trouble with it, but then I never used the PCMCIA slot.
A500, A600, A1200, A2000, A4000D, A4000T, CD32