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

From: Segher Boessenkool <>
Date: Thu, 25 Aug 2011 18:54:22 +0200
Message-Id: <>
> Hm, I own a 6569R3, some 6569R5 and some 8565R2. I don't notice any  
> difference in picture quality between the 6569-Revisions, the  
> 8565R2 seems to provide a slighty brighter picture. It also has the  
> 'grey-dots-bug'. If you write to the background or border color  
> register (even if this doesn't change the contents) you get a grey  
> dot on the screen at the moment the register is written to. The  
> intro for Giana Sisters does show that quite nicely. Looks like a  
> kind of 'snow effect' if done right. This doesn't happen on a 6569.  
> On some 8565-VICs it goes away once the chip warms up.
> The bug is also present with TED and the VIC used in the C128. It  
> seems as if it got introduced with the switch to HMOS.

Are you sure this depends on the chip, and not on the board?  The grey
dots are caused because #CS is active before the data lines are.  The
dots go away if you add a cap to the #CS line.


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Received on 2011-08-25 17:00:42

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