Re: VIC-II DRAM refresh

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Sat, 15 Oct 2016 19:06:34 +0200 Message-ID: <64994fe1-5269-0326-c449-471e92ff3a8f@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 10/14/2016 01:21 PM, silverdr@wfmh.org.pl wrote:
>
>> On 2016-10-14, at 12:52, Francesco Messineo <francesco.messineo@gmail.com> 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.

  Gerrit

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