[Coco] 1702 monitor

[Dave Philipsen]

And if you’re any good with a soldering iron you might even consider instead hacking the 1702 end of things to see if you could simply bring in the RGB and sync signals and get an even better image.  Eventually, in an analog color monitor with a picture tube any input signal is going to eventually get resolved to a red, green, and blue signal which drives the guns of the CRT.  The composite or s-video or chroma/luma interfaces are just bottlenecks in ultimately getting those three signals along with h-sync and v-sync into the monitor.


Dave

> On May 17, 2018, at 10:01 PM, Gene Heskett <gheskett at shentel.net> wrote:
> 
>> On Thursday 17 May 2018 22:12:27 Mike Delyea wrote:
>> 
>> Oops, I made a mistake.  The back of the 1702 monitor has 3 rca jacks,
>> chroma, luma and audio.
> 
> The 1702 predates the standardization of the s-video connector, so that 
> is not surprising.
> 
>> Is it possible to split the composite video 
>> out of the cc3 into chroma and luma?
> 
> No. It must be picked up and exported as two signals. Once its been 
> combined into composite, all the advantages of the s-video format are 
> lost forever.
> 
> Can you get s-video out of a coco3? Yes but it will be an internal 
> hooking up in order to get the sum of the 3 rgb outputs for a luminance 
> output, and the chroma output from the mc1302 color encoder IC in the 
> tuner box. You ought to get a pretty good image out, but the internal 
> hookup might be a little worrysome for those who aren't good friends 
> with a soldering iron.
> 
>> On Thu, May 17, 2018 at 10:00 PM, Mike Delyea <mdelyea at gmail.com> 
> wrote:
>>> Thanks guys.  Barry, $75?  The monitor isn't worth that much.  I was
>>> hoping for something I could hack together - no offense.
>>> 
>>> On Thu, May 17, 2018 at 8:32 PM, Gene Heskett <gheskett at shentel.net>
>>> 
>>> wrote:
>>>>> On Thursday 17 May 2018 17:05:13 Sean wrote:
>>>>> Chris Hawks made an RGB to S-Video adapter for the CoCo 3,
>>>>> however I don't know they are still being produced.
>>>>> I don't think you can even find a new TV with an S-Video port.
>>>> 
>>>> I have a 42" LG from Wallies in the room Dee has settled in since
>>>> she started breaking things, that has one, and the 10 yo SamSung
>>>> 22" in my bedroom has one. The LG is maybe 5 or 6 years old.
>>>> 
>>>> I haven't checked newer stuff as ours is working yet.
>>>> 
>>>>> On Thu, May 17, 2018 at 3:18 PM, Mike Delyea <mdelyea at gmail.com> 
> wrote:
>>>>>> I have a Commodore 1702 monitor.  It has composite for the
>>>>>> front connectors and s-video on the rear.  Has anybody got the
>>>>>> s-video working with a coco3?
>>>>>> 
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>>>> --
>>>> Cheers, Gene Heskett
>>>> --
>>>> "There are four boxes to be used in defense of liberty:
>>>> soap, ballot, jury, and ammo. Please use in that order."
>>>> -Ed Howdershelt (Author)
>>>> Genes Web page <http://geneslinuxbox.net:6309/gene>
>>>> 
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> 
> 
> 
> -- 
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
> 
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