[Coco] SCART to HDMI project.

[CoCo Demus]

a XNOR you keep the serrated vsync, a NOR gate you make it flat. some
monitor may complain about a flat vsync

On Tue, Jun 13, 2017 at 11:43 AM, Salvador Garcia via Coco <
coco at maltedmedia.com> wrote:

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