[Coco] S-video Prospects...

[Stephen H. Fischer]

Hi,

There is no information anywhere on what IC he is using!

I suspect that he IS using one of the AD72X series,
but he is keeping that information absent.

Probable because with the IC it is a simple process to
duplicate his work and under cut him on price.

The $95 price is below Analog's > $125 price for their evaluation board
but much higher than the ~ $15 that building your own would cost.

BTY, I just used 3 resistors, one in each of the R, G and B lines to connect 
My CoCo 3
to the AD723 Evaluation board for S-Video output to my RCA TV.

Now, if his price was lower, it would be a fine CoCo 3 add on,
even though he has too many unnecessary parts for our usage.

Stephen H. Fischer

Chris Hawks wrote:
> ---Reply to mail from jdaggett at gate.net about [Coco] S-video Prospects...
>
>> If one were to use the AD725 chip the RGB input is AC coupled and
>> needs to be no more than 714 mV max at 75 Ohm load. The fact
>> that the Coco 3 levels are 1.2 V peak really presents only a minor
>> problem. If other systems like the Atari or Comodore have different
>> levels of output, that may complicate things a bit in order to have
>> one board fit all.
>
>    How about this guy for converting RBG to S-Video?
> http://www.jrok.com/hardware/RGB.html
>
>    It's for old video games, but, IIRC they're about the same 15khz etc.
> It does take 'composite sync' and we have it separate, but, 2 high speed
> diodes should take care of that. Also has "RGB input level controls -
> For matching RGB input levels to video game boards
> with high outputs."
>
> ---End reply
>
> Christopher R. Hawks
> HAWKSoft
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