Re: 6569 luminances

From: Segher Boessenkool <*segher_at_kernel.crashing.org*> Date: Sun, 13 May 2012 21:59:34 +0200 Message-Id: <8BE949D6-83A7-4B33-8D16-B502CC91912A@kernel.crashing.org> · segher_at_kernel.crashing.org

> a little ago we had a discussion on the VIC luminances levels and  
> this picture by Markko was referred
>
> http://www.zimmers.net/anonftp/pub/cbm/documents/chipdata/656x- 
> luminances.gif
>
> It seems that the R3 displays colours noticeably brighter than R4  
> for example

[snip]

There should also be pretty big differences between different batches
of the same chip, and individual chips in a batch even, especially
on the 65xx (less so on the 85xx I think, but it could be the other
way around, hrm.  Threshold voltages are more uniform on the 85xx,
but diffused resistor values is what matters more here).

Segher

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