Re: 6567 revisions (was Re: 264/TED/Plus4 Story)

From: Gerrit Heitsch <>
Date: Wed, 24 Aug 2011 20:38:30 +0200
Message-ID: <>
On 08/24/2011 08:23 PM, Marko Mäkelä wrote:
> On Wed, Aug 24, 2011 at 07:05:36PM +0200, Gerrit Heitsch wrote:
>>> The end of the story was that I went to a CES show and woman pulled
>>> me into her booth to show me the educational software she had written
>>> for the C64. I remember her display had nasty lines in it, she didn’t
>>> yet have access to the R7 chips.
>> The 6567 before R7 were that bad? Since I live in PAL land I have
>> never seen them and the 6569R3 and later always produced a very good
>> picture if the Monitor was hooked up by Chroma/Luma.
> I live in PAL land too, but I traded a few 6567 chips for 6569. As far
> as I remember, the 6567R8 is comparable to the 6569R3. I got one or two
> of them. The oldest NTSC chip that I encountered was a 6567R56A, which
> is about the same picture quality as the 6569R1 (both in ceramic case).

One thing I noticed about the 6569R3 and R5 (the latter in plastic) is 
that they run very hot (I almost burned my finger on an R5 that didn't 
have a heatsink) but that doesn't seem to cause any problems while you 
always hear with the 8501 and TED that they overheat and fail quickly.

More and more I think that the 8501 and TED fail not due to overheating 
but them being MOS earliest attempts at HMOS-II and the process not 
being stable yet. The later 8xxx MOS chips don't seem to have that 
problem. If that's the case, using a heatsink on a 8501 or TED will only 
delay the premature failure (compared to other chips) but not stop it.

Oh... and I found out what happens if you have a 6569R3 where the +12V 
supply is only +8V (due to a dead capacitor), system still runs but you 
only get color while the chip is cold, once it heats up the picture 
becomes black and white.


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Received on 2011-08-24 19:00:23

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