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

From: Hársfalvi Levente <*hlpublic_at_freestart.hu*> Date: Wed, 24 Aug 2011 21:30:24 +0200 Message-ID: <4E555150.60607@freestart.hu> · hlpublic_at_freestart.hu

On 2011-08-24 20:23, Marko Mäkelä wrote:
> 
> 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).
> 
> A peculiar thing about the 6567R56A is that the video timings are
> different. It is 64 cycles per line, while the 6567R8 is 65 cycles per
> line. Maybe even the number of lines differed. All 6569 revisions that I
> know of are 63 cycles per line and 312 lines per frame.

I seem to remember that they also provided about half the number of
luminance levels than later ones (6567R8 / 6569R3) did (which really
affected picture quality IMHO).

Levente

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