[Coco] 6847 Video (newbie question)

[Zippster]

That looks pretty good.

- Ed


> On Nov 6, 2014, at 2:45 PM, didier derny <didier at aida.org> wrote:
> 
> 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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