Re: VIC-II DRAM refresh

From: Gerrit Heitsch <>
Date: Sat, 15 Oct 2016 19:06:34 +0200
Message-ID: <>
On 10/14/2016 01:21 PM, wrote:
>> On 2016-10-14, at 12:52, Francesco Messineo <> wrote:
>>> Not much since the MT4264 have been working fine for years and only lately
>>> started failing and when they fail it's a consistant pattern of not the
>>> whole chip failing but a number of cells.
>> that's almost always how DRAM chip fail.
> I'd say the "meltdown" (as Gerrit called it) is at least as common.

In German I use the word 'Kernschmelze' which would translate to 'core 
meltdown'. :)

And yes, I also had a few DRAMs that were just dead and doing bad things 
on the bus. One I found by stacking not one but two working 4164 on top 
of the bad one (*) after noticing the activity on the data line looked 
strange on the scope.

(*) Only used for debugging of course.


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Received on 2016-10-15 18:00:01

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