[Coco] CoCo 3 to RBG...

[gene heskett]

On Tuesday, August 09, 2011 08:42:19 PM Steve Batson did opine:

> Forgive me if I missed the answer to all of this....I've been away on
> vacation, there's been multiple threads about the topic and I'm not
> sure what my next step should be...
> 
> Remember, I purchased the card, built the appropriate CoCo to CGA cable,
>  and couldn't get it to work from CoCo to my LCD Monitor with a SVGA
> connector. I have not built the circuit offered combine the sync
> signals yet. I basically have 2 questions:
> 
> 1) Has anyone got it working without the extra circuit?

I haven't heard of it if someone has.

> 2) Is it working well using just the board and the extra circuit?

I currently have it working with a diode OR and invertor comnbiner, and the 
pix is great, but am trying to locate a round tuit and try an even easier 
circuit, I currently have another chip to do the mixing sitting on top of 
IC15.  I have the chips here, but several things have contrived to take up 
my time recently, like my milling machine blew its drivers for the 3rd 
time, so I have some heavier duty ones on a rowboat from Hong Kong.  In the 
meantime I've put an older 3 axis driver in until the bigger ones get here.
And this weather is making wood working difficult, throw a coat of finish 
on and watch it warp, so that project isn't making real great progress.

> I'm a bit confused with all the stuff on this topic so far on multiple
> threads.
> 
> Thanks.
> 
> Steve
> 
> On Jul 22, 2011, at 6:45 PM, gene heskett wrote:
> > On Friday, July 22, 2011 09:36:09 PM mike delyea did opine:
> >> Sorry I am not an electronics whiz by any stretch of the imagination
> >> but - When hooking the coco to an Amiga 1080 monitor I used a 74ls02
> >> to combine HSYNC and VYSNC.  This gave me perfect 80 column text on
> >> the 1080.  Looking back on my notes, this hack only provides
> >> composite sync.  Maybe this helps.
> > 
> > I never had a 1080 or a 1084 myself, I had a maggy 8CM515, buckets
> > sharper.
> > 
> > Little known trivia bit:  The honest to goodness Commode-door monitor
> > cable actually had a 74LS02 to do exactly that, encapsulated into the
> > molded backshell of that DB23 connector.  I know, I carved 2 of them
> > open carefully with a dremel and replaced the chip when it got blown.
> >  Not even commie's tech folks would admit to that, preferring instead
> > to sell yet another $29.95 cable, or worse yet, a $159.95 genlock
> > board.
> > 
> > I am glad you reminded me of that, it is also quite do-able.
> > 
> > BTW, that isn't true composite, but its close enough for most of the
> > girls we go with if you don't mind a wee bit of horizontal jitter in
> > the top 2 or 3 lines of the video.
> > 
> > Cheers, gene
> 
> Steve Batson
> Batson Photography
> "Today's Special Moments, Tomorrow's Priceless Treasures"
> 
> Website: http://www.batsonphotography.com
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> 
> 
> 
> 
> 
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Cheers, gene
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