Re: AppleColor RGB lines

[Michael J. Mahon <mjmahon@aol.com>]

KP <kjpmail@gmail.com> wrote:
> On Apr 22, 9:26 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:
>> KP wrote:
>>> On Apr 22, 8:46 pm, Osgeld <osg...@cheesefactory.us> wrote:
>> 
>>>> On Apr 22, 6:18 pm, KP <kjpm...@gmail.com> wrote:
>> 
>>>>> On Apr 22, 7:17 pm, Osgeld <osg...@cheesefactory.us> wrote:
>> 
>>>>>> On Apr 22, 5:58 pm, KP <kjpm...@gmail.com> wrote:
>> 
>>>>>>> Thank you.  I'm going to hope it either resolves itself or I come
>>>>>>> across a cheap AppleColor RGB to replace it with.
>> 
>>>>>>> Incidentally, is there any solution that would not involve assembling
>>>>>>> my own cables (never done that before, not looking to start) but that
>>>>>>> would nonetheless allow me to connect the IIgs RGB-out to either a VGA
>>>>>>> monitor or an S-Video TV?  I've read about the Australian/New Zealand
>>>>>>> S-CART converter cable.  Is there a way to use that to put the signal
>>>>>>> into S-CART and then use another intermediary to put the signal into
>>>>>>> VGA such that it can go into a normal monitor, or 31.5 khz S-Video
>>>>>>> such that it can go into an S-Video TV?  Or even 31.5 khz separate-
>>>>>>> component plugs (the differentiated parts that are combined in a
>>>>>>> "composite" plug)?
>> 
>>>>>>> I would love to not have to rely on a 25-year-old monitor--and to be
>>>>>>> able to junk & replace the monitor whenever necessary.
>> 
>>>>>> I am not saying anything is impossible, but VGA is not going to happen
>>>>>> without extra hardware, it just simply runs 2x as fast in its slowest
>>>>>> form. s-video is more likely, though your going to need a converter or
>>>>>> pick the signals off the motherboard as I keep threatening to do on
>>>>>> my //c as s-video is not a RGB signal
>> 
>>>>> I don't mind a converter.  What I mind is slicing & dicing my own
>>>>> cables.
>> 
>>>>> If there's a combination of existing cables and existing converters
>>>>> that can do it, I want to know!
>> 
>>>> I have never used one but they do exist
>> 
>>>> http://sewelldirect.com/Component-YPbPr-RGB-RCA-to-Composite-Yellow-R...
>> 
>>> No, that receives the triple components.
>> 
>>> I need to receive as SCART in order to use this:
>>> http://vintageware.orconhosting.net.nz/scart.html
>> 
>>> So I need to put IIgs to SCART using that cable.
>> 
>>> And THEN, I need to put the SCART to either S-Video or Component.
>> 
>>> Is there anything that can do the second step of that process?
>> 
>>> While simultaneously fixing the problem of the IIgs putting out 15 khz
>>> and the TV or monitor receiving 31 khz?
>> 
>> The TV will handle a 15kHz horizontal sweep rate--that's standard.
>> 
>> The problem you are experiencing is unlikely to be caused by your
>> monitor, which I suspect is working fine (see my earlier response).
>> 
>> Your life will be much simpler if you can simply use a 15kHz monitor.
>> Conversion to VGA *with the quality you are accustomed to* is not a
>> trivial matter.
>> 
>> -michael
>> 
>> NadaNet 3.1 for Apple II parallel computing!
>> Home page:  http://home.comcast.net/~mjmahon/
>> 
>> "The wastebasket is our most important design
>> tool--and it's seriously underused."
> 
> To the best of my knowledge, the only available 15 khz monitor is that
> Samsung one with the SCART input.
> 
> Are there others commonly available?

While there are good reasons to want a VGA solution, the best results with
the least fiddling will always be converting 15kHz RGB to 15kHz YCrCb
(component video). 

This is purely a real-time (no storage) analog (video opamps) solution.  It
has been published at least once, and should, with today's ICs, be both
cheap and low-powered. 

I'm surprised that video gamers haven't made it more popular. 

-michael  -  NadaNet 3.1:  http://home.comcast.net/~mjmahon