Re: 6569 vs. 8565

From: silverdr_at_wfmh.org.pl
Date: Mon, 26 Nov 2012 21:06:01 +0100
Message-Id: <626C94E9-9C07-4A71-803E-19E4772CED2F@wfmh.org.pl>
On 2012-11-26, at 20:58, Gerrit Heitsch wrote:

>>> Maybe that generator in your 6569 is a bit 'off' with respect to signal quality? Have you tried a different 8701?
>> 
>> After I fixed that second board I have now two working 250425s. Both behave almost identically. Swapping VICs and 8701s doesn't make any change.
> 
> What revisions of the 6569 do you use? Also, how hot do they run?

R5 and R3. R5 runs very hot (don't have the meter here). R3 runs hot. Just - the artefacting doesn't seem to be highly temperature dependent. Yes, there is a change with temperature but the reddish pixels are there from the cold start.

>>> Also, some people claim, that the old clock generator (74LS629 and MC4044P on the 250407 boards) produces less jitter than the 8701.
>> 
>> I watched the clocks from the 8701. They look differently on the wide and on the narrow boards but generally both seem to have similar jitter (as far as I can tell from measuring freq on different ranges) while the output from 8565 doesn't create the ghostings. The chroma output from 6569 and 8565 does differ significantly though. Hm, maybe I check with a "regular", not studio monitor. Who knows, maybe this one is more sensitive to things being off norm.
> 
> I only have a 1084 and 2 LCD (one a TV) with S-Video input. They all show the color ghosting differently. I have not tried CVBS.

Yes, this is all Y/C connection here.

-- 
SD!
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Received on 2012-11-26 21:00:51

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