[Coco] 6847 Video (newbie question)

[Daniel Campos]

The colors are not right, need to be like this:

https://picasaweb.google.com/109345699838454178536/OMeuPrimeiroCP400#5936878406541950354

Sure you don't inverted Cb with Cr on the input pins of your 8220 ?

Daniel

Em 06/11/2014 18:45, didier derny escreveu:
> This is the result:
>
> http://6809.eu/t1.jpg
>
> another test:
>
> http://6809.eu/t2.jpg
> (colors better on the real screen)
>
> Btw I don’t have a coco3 but a coco2
>
> I've not soldered floating wire to the 6847
> But I've soldered a socket (with pins 1,3,8,10,12,13,14 cut)
> [if I remove my connector, the tv modulator is still working]
>
> Then on this improvised connector I connect either
> The composite or the ypbpr interface.
>
> The ypbpr interface is just a bunch of wires
> Connected to a small breadboard
>
> http://6809.eu/if.jpg
>
> now that I have a result I'll rebuilt it on a larger breadboard
> with some adjustable resistor to try to improve the result
>
> for example, the black is not really black
>
> then I'll move to a real pcb
>
>
>
> -----Message d'origine-----
> De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de Daniel Campos
> Envoyé : mercredi 5 novembre 2014 22:47
> À : CoCoList for Color Computer Enthusiasts
> Objet : Re: [Coco] 6847 Video (newbie question)
>
> Very good already! But please do the command bellow and take a picture, please.
>
> FOR I=32 TO 255:? CHR$(I);:NEXT
>
> Daniel
>
> Em 05/11/2014 19:44, didier derny escreveu:
>> I modified the value of some resistors, I get a better result
>>
>> This is what I get:
>> http://6809.eu/ypbpr3.jpg
>>
>> for reference the composite:  (it's just ugly) :(
>> http://6809.eu/composite.jpg
>>
>>
>> Modification made to Luis schematics:
>>
>> 150 ohms resistor between emitter of the first transistor and GND replaced by 330 ohms
>> 75  ohms resistor Cb out  and Cr out    replace by 37.5 ohms  (2 resistors 75 ohms in parallel)
>>
>> All le settings of the GBS 8220 are set to default
>>
>>
>> --
>> didier
>>
>> -----Message d'origine-----
>> De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de didier
>> derny Envoyé : mercredi 5 novembre 2014 21:45 À : 'CoCoList for Color
>> Computer Enthusiasts'
>> Objet : Re: [Coco] 6847 Video (newbie question)
>>
>> In fact it was a problem with the breadboard (a stupid bad contact)
>>
>> http://6809.eu/ypbpr2.jpg
>>
>> I'll try to find a color test...
>>
>> I find the black really good compared to composite With the composite
>> the letter S looks a little bit like 8
>>
>> I don’t find the colors ok, "too clear"
>> (looks better on the image, that it really is)
>>
>> --
>> Didier
>>
>>
>>
>> -----Message d'origine-----
>> De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de Luis
>> Antoniosi (CoCoDemus) Envoyé : mardi 4 novembre 2014 23:15 À :
>> CoCoList for Color Computer Enthusiasts Objet : Re: [Coco] 6847 Video
>> (newbie question)
>>
>> Inverted transistor ? Did you check the datasheet ? They change EBC pins from vendor to vendor.
>>
>>
>> Luis Felipe Antoniosi
>>
>>
>>
>> On Tue, Nov 4, 2014 at 5:11 PM, didier derny <didier at aida.org> wrote:
>>
>>> This is what I get, I have an image but obviously I have a problem
>>>
>>> This is the 3 signals   Y + PB + PR
>>> http://6809.eu/ypbpr.jpg
>>>
>>> I tried with only Y connected  (I expected a black and white image)
>>> http://6809.eu/y.jpg
>>>
>>> It's connected to a GBS 8220
>>>
>>> --
>>> Didier
>>>
>>>
>>>
>>> -----Message d'origine-----
>>> De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de Luis
>>> Antoniosi
>>> (CoCoDemus)
>>> Envoyé : vendredi 31 octobre 2014 22:04 À : CoCoList for Color
>>> Computer Enthusiasts Objet : Re: [Coco] 6847 Video (newbie question)
>>>
>>> It works, but you need to make a driver:
>>>
>>> https://pbs.twimg.com/media/BCb7-hoCEAAJm22.jpg:large
>>>
>>> When I used my it suffered from severe jumps time to time. maybe you
>>> have better luck and a better board.
>>>
>>>
>>> Luis Felipe Antoniosi
>>>
>>>
>>>
>>> On Fri, Oct 31, 2014 at 3:58 PM, didier derny <didier at aida.org> wrote:
>>>
>>>> I just received a GBS 8220 and I was wondering if the YPBPR entries
>>>> of the GBS 8220
>>>>
>>>> Were compatible with the Y phiA phiB of the 6847 ?
>>>>
>>>>
>>>>
>>>> Are they the same signal with another name or something different ?
>>>>
>>>>
>>>>
>>>> Not really understood fig 10 of the 6847 datasheet
>>>>
>>>>
>>>>
>>>> I often used composite or rgb but never  YPBPR or the signal of the
>>>> 6847
>>>>
>>>>
>>>>
>>>> Any idea ?
>>>>
>>>>
>>>>
>>>> Thanks
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>>
>>>> Didier
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> --
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>>>> Coco at maltedmedia.com
>>>> https://pairlist5.pair.net/mailman/listinfo/coco
>>>>
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