[Coco] Generic VGA adapter

[Barry Nelson]

> Steve C. towmater at gmail.com  <mailto:coco%40maltedmedia.com?Subject=Re%3A%20%5BCoco%5D%20Generic%20VGA%20adapter&In-Reply-To=%3CCACAVgyGJ-MzL03uYB0%2BV_mqBF4QP2%3DyYtpV06pWHKijYcUXTqw%40mail.gmail.com%3E>
> Wed Jan 25 13:08:38 EST 2017
> 
> I rewired the Scart convertor to draw power from a 1-amp iPhone 5v supply.
> Still no joy. I have resigned myself to this not working, and it won't be
> the first time that buying the cheapest option on Amazon has led to
> dissapointment. Still, at the very least I now have a composite to HDMI
> convertor running, making for a slightly less messy wiring behind the
> Coco3. Many thanks for nursing me along with this.
> 
> When I gather again my resolve, (and some money) I will look at buying a
> new convertor and try once more.  Meanwhile, what are your thoughts on
> using the same design to convert Commodore C128 RGB to HDMI?
> 
> -Steve

With the external supply connected, what is the voltage between pins 16 and 18 (which should be a common ground) on the SCART connector?

SCART will NOT work with a C128 without additional circuitry since the Commodore outputs a digital RGBL signal instead of analog RGB.