[Coco] Re: [Color Computer] Re: TRS-80 CoCo Group Color Computer Composite Video - Compared to "modern" composite - I don't get it

[Mat¡as Guti‚rrez Reto]

My case is similar to Ben's.

Related to this subject I've a little question.
I've found this groups some time ago and I decided to reconnect again my Coco 
2, which I did not use from the late 80s.
Back in the 80s I used to connect my Coco to a 300 ohms impedance tv antenna 
input.

Nowadays the antenna input from my tv is 75 ohms. The right impedance to 
connect the coco is 300 ohms, right? In that case I imagine that an impedance 
adaptor will by necessary.

Regards from Argentina,
Matías

On 29 Jan 2006 at 21:55, Neil Morrison wrote:

> 
> 
> You have to connect to the ANTENNA, not the video in. Note that it has a 
> channel 3/4 switch - the TV has to be set to the same channel. You may need 
> an adaptor plug, but you can't use the RF modulator - return it.
> 
> (Other lists - copy this guy please, he's only on 
> TRS80CoCo at yahoogroups.com )
> 
> Neil
> 
> ----- Original Message ----- 
> From: "benwillis" <benwillis at verizon.net>
> 
> 
> > Hello, I'm new to this board and hope that there's somebody out
> > there who can help me understand something.
> >
> > I've loved the Coco for years, used one in college back in the early
> > 80's for my degree. It was cool to hookup to the TV, had a 300 baud
> > modem, cassette drive, loved it, but always had screen interference
> > problems with the RF modulator. Oh well.
> >
> > Now I've purchased one on eBay, even got a floppy drive (I just had
> > cassette in college, couldn't afford the $500 drive!).
> >
> > Anyway, I want to hook it up, and get a good picture. Bought an RF
> > modulator, disappointing to say, it still has a crappy picture.
> >
> > Then I was wondering - the Coco (this is a Coco 2) has a composite
> > video out, but what confuses me is it has _both_ video and audio
> > over one cable. Newer TV's with composite input have just the video
> > on the composite cable, and the sound is separate. Plus if I plug
> > the composite from the Coco into the TV composite input, it (of
> > course) doesn't work.
> >
> > What I don't get is, why doesn't it work? Why is the sound/video
> > together on the Coco composite, but separate on "modern" TV's? Is
> > it possible to separate the 2 somehow and plug directly into a TV
> > without an A/B switch? All I want is to display the video crisp and
> > sharp and also have sound. Should I just buy a Coco monitor?
> >
> > Any advice on improving the Coco picture, and making it work well
> > with a TV, would be appreciated.
> >
> > Thanks,
> > Ben
> 
> 
> 
> Brought to you by the 6809, the 6803 and their cousins! 
> 
> 
> 
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---
Matías Gutiérrez Reto
CMA Argentina
(54 11) 43 28 68 08 Interno: 108
http://www.e-cma.com.ar


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