[Coco] 6847 Video (newbie question)

[didier derny]

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
>>>
>>>
>>>
>>>
>>>
>>>
>>> --
>>> Coco mailing list
>>> Coco at maltedmedia.com
>>> https://pairlist5.pair.net/mailman/listinfo/coco
>>>
>> --
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>>
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