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Re: Question for other Highway converter owners
To: Steven Hirsch
From: Michael.J..Mahon@familynet-international.net
Steven Hirsch wrote:
> Steven Hirsch wrote:
>
>> Steven Hirsch wrote:
>>
>>> This evening, I'm planning to rewire the SCART cable so the IIGS
>>> composite sync goes to the SCART sync-in instead of composite video.
>>> This will likely not help the banding, but may mitigate some of the
>>> flashing and flickering (which really does look a sync problem).
>>
>>
>> Alas, turns out that IIGS sync _is_ connected to the only place where
>> it can go on the SCART connector; composite video in.
>
>
> Followup on my travails with the Highway 100 converter:
>
> By default, Roger Johnstone's IIgs --> SCART cable applies composite
> sync to the composite video input on the converter. MdntTrain told me
> this yielded the best results on his unit, so I never really mucked
> around with it. Today I discovered that I'm better off applying the
> IIgs composite video signal to that pin! It seems to have solved the
> worst of the banding problems and the picture now looks quite good.
>
> The question is: Why does this behave so differently between the two
> converters? At any rate, life is now good and I can heartily recommend
> the Highway converter to other IIgs owners with the proviso that you may
> need to do some experimentation with the wiring.
This could be the result of a greater sensitivity to sync levels in your card,
and that could result from any number of small changes on the Highway
converter.
A simple experiment would be to put a 100-Ohm pot between the IIgs sync signal
and the sync-in pin. If the problem is fixed by reducing the level of the
sync, that would confirm the hypothesis.
I'm glad you got it working!
-michael
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