[Coco] RGB/VGA/Svid

Gene Heskett gene.heskett at verizon.net
Sat May 27 18:17:20 EDT 2006

RJRTTY at aol.com wrote:
> In a message dated 5/27/06 2:51:00 P.M. Eastern Daylight Time,  
> vchester at setec-cr.com writes:
>> I'm still wanting to run Roy's VGA AND Chris' Svid adapters at the  same
>> time, and keep a Coco standard RGB output in reserve. That makes  three video
>> outs using the single RGB header. Only two would be used  simultaneously. But
>> since I'm planning on putting it all into a PC case,  I don't want to have to
>> open 'er up and pull cables to switch from one to  another.
>> Would it be possible to have three sets of transistors Q5,  Q6 & Q7 (with
>> their resistors of course) one set each to drive the  two adapters and the
>> one Coco standard RGB simultaneously? What about  Hsync and Vsync? Would
>> these need separate drivers as well?  How?
>> Thanks.
>> /Chester
> It would be easier to clip the input resistors on either my converter  or
> on chris' S-video converter then you could connect them both at the
> same time.  The sync signals can be combined without any  modifications.
> Roy
That, depending on the lengths of the cables, could lead to some 
interesting edge effects.  With short cables, with short being defined 
as less than say 5 feet, it will probably be ok.

Cheers, Gene

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