From: Scott McDonnell (simstoolbox_at_attbi.com)
Date: 2002-10-02 07:22:34
----- Original Message -----
From: "Marko Mäkelä" <marko.makela@hut.fi>
To: <cbm-hackers@cling.gu.se>
Sent: Tuesday, October 01, 2002 2:42 PM
Subject: Re: Vic 20 RF Modulator
> On Tue, Oct 01, 2002 at 07:58:23PM +0200, Christer Palm wrote:
> > With a bit of soldering you can, of course, also use any suitable RF
> > modulator as a replacement.
>
> But where can you find such modulators? Not all modulators operate on
> a composite video signal. I have the opposite problem, trying to get
> composite video output (or S-video for that matter) from an Atari VCS
2600.
Basically both problems go hand in hand. Nearly EVERY modulator either
accepts luma/chroma or composite video for the input. This is because a
modulator does exactly what it is named; it modulates a compositie signal by
simply adding composite video signal and line-level audio signal directly
into a Chan 3 or 4 carrier frequency. If a modulator accepts a luma/chroma
signal, it is going to convert that into composite video before adding it to
the channel carrier.
Going from Luma/Chroma to composite is fairly simple. It is just a capacitor
buffer on the chroma line terminating into the Y and C lines tying together.
http://www.hut.fi/Misc/Electronics/circuits/svideo2cvideo.html
or for a deeper understanding and even more circuits:
http://www.epanorama.net/links/video.html
(might want to bookmark http://www.epanorama.net)
A google search for "Atari 2600 composite" resulted in this site.
http://www.classicgaming.com/vcsp/HowToMAIN.htm
If you are not comfortable with modifying your Atari, you could use a VCR to
do this for you.
However, to the original poster of this question: I would say to get your
hands on some kind of monitor with composite inputs, purchase a
fully-packaged modulator directly (read: no soldering required) from an
electronics retailer. Here in the states they go for around $20 USD at Radio
Shack. I'm sure you have some similar shop in your local area.
Of course, this does not solve your problem of not being confident with a
soldering iron, because you will still need to make a DIN to RCA cable. You
might look into it though, because it is extremely trivial to do (and if you
get crimp-type connectors, you do not even need to solder.)
>
> Another idea: if you want a Commodore to Scart cable but don't want to
> solder, get one of those cheap RCA (or RCA/Mini-DIN) to Scart adapters and
> a DIN to 4 RCA plugs cable. (Or a DIN to 2 RCA plugs cable, in which case
> you probably will have to reroute one of the wires going to the DIN plug.)
>
> Marko
>
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