Re: VIC-II and luma levels

From: Gerrit Heitsch <>
Date: Fri, 13 Jan 2012 18:48:13 +0100
Message-ID: <>
On 01/13/2012 06:40 PM, Segher Boessenkool wrote:
>>>> Although the timing stayed the same between 6569R1 and 6569R3, the
>>>> number of luminance levels changed and the timing of video accesses
>>>> changed also. Christian Bauer's document has the details.
>>> I don't see it? Do you perhaps misremember, or are you looking
>>> at a modified version of his doc?
>> I misremembered. I think it was Marko Makela who mentioned it, some
>> years ago. The sequence of sprite accesses was different between
>> 6569R1 and 6569R3. With the borders open and sprites in the borders,
>> you could see the difference in at least one of the sprites.
> Any chance you can dig up some details? :-)

I'd be interested too... I did play 'Edge of Disgrace' on a 6569R1. That 
demo has a lot of open border stuff and I didn't notice any obvious 
difference between the 6569R1 and later revisions.

It can be detected by software though, so maybe the better coders 
adjusted their code to it?


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Received on 2012-01-13 18:00:37

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