[Coco] SCART to HDMI project.

[Salvador Garcia]

I had never heard of an XNOR gate, I had to look it up! 74266 :-) Salvador



      From: Doug Fraser <frase072 at telus.net>
 To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> 
 Sent: Tuesday, June 13, 2017 1:18 PM
 Subject: Re: [Coco] SCART to HDMI project.
   
I was just thinking that. I might have a xnor chip in my collection. Good to know about pin 10. Thanks for that. Will investigate and post my findings. 
Doug Fraser 


Sent from my Samsung Galaxy smartphone.
-------- Original message --------From: CoCo Demus <retrocanada76 at gmail.com> Date: 2017-06-13  11:03  (GMT-08:00) To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> Subject: Re: [Coco] SCART to HDMI project. 
Also should be a XNOR gate, because the signals are inverted on coco3.

On Tue, Jun 13, 2017 at 11:03 AM, CoCo Demus <retrocanada76 at gmail.com>
wrote:

> Yes, you need to add a XOR TTL combining h-sync and v-sync and you can
> disconnect the pin-10 and use it on the RGB connector. the pin-10 is used
> only for the cm-8 for a strange detection system, all this undocumented.
>
> On Tue, Jun 13, 2017 at 10:33 AM, Doug Fraser <frase072 at telus.net> wrote:
>
>> That's possible. A good question is where should we get the h-sync and
>> v-sync signals from? The project suggests the centre pin from the composite
>> video to pin 20 on the scart connector (sync in). Is there a way to combine
>> the rgb sync signals to replace the composite sync signal?
>> Doug Fraser
>>
>>
>> Sent from my Samsung Galaxy smartphone.
>> -------- Original message --------From: CoCo Demus <
>> retrocanada76 at gmail.com> Date: 2017-06-13  07:14  (GMT-08:00) To:
>> CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> Subject:
>> Re: [Coco] SCART to HDMI project.
>> For what you are describing: black and white, black stripes looks to me
>> you
>> connected coco3 composite video into a scart luma input.
>>
>> On Mon, Jun 12, 2017 at 11:36 PM, Barry Nelson <
>> barry.nelson at amobiledevice.com> wrote:
>>
>> > > frase072 frase072 at telus.net  <mailto:coco%40maltedmedia.com
>> > ?Subject=Re%3A%20%5BCoco%5D%20SCART%20to%20HDMI%20project.&
>> In-Reply-To=%
>> > 3Ctqar0lch5fyvl7tt6iq19drr.1497324709423%40email.android.com%3E>
>> > > Mon Jun 12 23:31:49 EDT 2017
>> > >
>> > > Just picked up an SCART to HDMI converter to replace my aging CM-8
>> > monitor. After following Barry Nelsons project on hackaday.io I have
>> had
>> > partial success with a video image. Partial in that I have a black and
>> > white screen and colors are grey scaled and artifacted with vertical
>> black
>> > lines. I'm not sure what is going on with the signal.  Does anyone that
>> has
>> > done this project have any insights as to how to make this work?
>> > > Doug Fraser.
>> > Can you post a picture of the screen? Make sure you connected all the
>> > ground wires and that you have 5 volts applied to the 100 ohm resistor.
>> > Double check all your wiring and measure the voltage on pin 16. Maybe
>> you
>> > got a bad converter, post a photo of the wiring also please, I may be
>> able
>> > to help more after I see the pictures.
>> >
>> > --
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>> >
>>
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>
>

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