Re: Commodore PLA equations (complete)

On 06/06/2012 07:09 PM, Bil Herd wrote:
> Yes especially the quick dying ones that only lasted between 1-6 months.
> You could see the corrosion creeping across the die under a microscope ,
> "purple creeping crud"  we called it.   There was a point probably late 84
> early 85 where the passivation problem was fixed.

Hm... might that at least partially explain the 'unstable' CPU and TED 
for the 264? Those were smaller (HMOS-I and HMOS-II), among the first 
chips using that process and they were known to die quickly, at least 
the 84 datecodes...


  Gerrit

>
> -----Original Message-----
> From: owner-cbm-hackers@musoftware.de
> [mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Gerrit Heitsch
> Sent: Wednesday, June 06, 2012 11:48 AM
> To: cbm-hackers@musoftware.de
> Subject: Re: Commodore PLA equations (complete)
>
> On 06/06/2012 06:12 AM, Bil Herd wrote:
>> Layer 7 was the passivation which we sucked at for quite a while.
>
> Would that explain why the PLA and some other chips made by MOS tended to
> die after a while?
>
>    Gerrit
>
>
>
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