Re: VIC-II and luma levels

From: Marko Mäkelä <>
Date: Fri, 13 Jan 2012 20:07:02 +0200
Message-ID: <20120113180702.GD2864@x60s>
On Fri, Jan 13, 2012 at 03:32:08PM +0000, Richard Atkinson wrote:
>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.

If I remember correctly, if you move the sprites to the left border 
close to where the border begins, the sprites would disappear at some X 
coordinate and then reappear when you move further to the left or right.  
The X coordinate would be somewhere in the $1c0 to $1ff range. You might 
also use double width mode to make the sprite better visible.

This was years ago. I do not think I opened the horizontal borders.  
Opening the horizontal borders would have to be done on every raster 
line, right? I think I just used POKEs from the BASIC. But I do not 
remember observing differences between the 6569R1 and 6569R3. I may 
have, I just do not remember it.


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Received on 2012-01-13 19:00:04

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