Re: Fat40 RAM problem?

From: Gerrit Heitsch <>
Date: Fri, 19 Sep 2014 17:10:59 +0200
Message-ID: <>
On 09/18/2014 10:14 PM, A. Fachat wrote:

> 2) if it would have been the lower 16 RAM, I would have run into problems with
> that approach. I would have probably tried to write a small machine language
> program that triggers a unique signal (like in the first approach, some I/O
> line, or maybe even the same /CAS signal as above) and immediately after that
> access to the other memory location (or do whatever you want to measure) - you
> can then count the cycles to see where the access is after the trigger and
> check there.

There is also a simple way to switch both RAM banks. Involves switching 
the 2 _CAS signals. If you have the universal system board that would be 
done with R11 and R10:


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Received on 2014-09-19 16:00:02

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