[Coco] Generic VGA adapter

[Steve C.]

I fear it may be the cheap SCART converter. I have the 100 ohm connected,
and the grounds are all tied to the coco GND, (unless it is supposed to
have a totally isolated 5V + ground? I used a pad conveniently marked 5V TP
on the MB for power) I even went the extra length of using shielded coax
for the RG and B lines with the shields tied to ground on the SCART
connector and motherboard.

On Sun, Jan 22, 2017 at 10:56 PM, Barry Nelson <
barry.nelson at amobiledevice.com> wrote:

> *Steve C.* towmater at gmail.com
> <coco%40maltedmedia.com?Subject=Re%3A%20%5BCoco%5D%20Generic%20VGA%20adapter&In-Reply-To=%3CCACAVgyHesogaf3AYKzUcZYg-4M-p9q%2BAN-TKbenNVJFRrN9WdQ%40mail.gmail.com%3E>
> *Mon Jan 23 01:03:29 EST 2017*
>
> I built this RGB-SCART-HDMI adapter, but it is seemingly just taking the
> composite video on pin 20 to HDMI and ignoring the RGB. Any ideas where
> this went wrong?
>
> One of 3 things is probably wrong.
>
> 1) You did not connect a +5V supply to a 100 ohm resistor to pin 16 as shown in the diagram.
>
> 2) You did not connect the ground of the 5V supply to ground on pins 4,5,9,13,17, and 18.
>
> 3) you got unlucky and got a SCART to HDMI converter that does not support RGB video. Send it back and get a different one. If this is it, let me know as it will be the first time this has happened.
>
>