Xref: utzoo rec.video:2955 comp.sys.ibm.pc:11837 sci.electronics:2167
Path: utzoo!dciem!king
From: king@dciem.UUCP (Stephen King)
Newsgroups: rec.video,comp.sys.ibm.pc,sci.electronics
Subject: Re: HELP!! NEED HELP!!
Message-ID: <2652@dciem.UUCP>
Date: 17 Feb 88 13:28:16 GMT
Article-I.D.: dciem.2652
Posted: Wed Feb 17 08:28:16 1988
References: <259@fedeva.UUCP> <173@lrakAT.UUCP>
Reply-To: king@dciem.UUCP (Stephen King)
Organization: D.C.I.E.M., Toronto, Canada
Lines: 41
Summary: 

In article <173@lrakAT.UUCP> karl@lrakAT.UUCP (Karl Vollbrecht (414) 358-1180 / 961-1602) writes:
>In article <259@fedeva.UUCP> gmw8868@fedeva.UUCP (Mitch Wood) writes:
>>Does anyone know of a EGA/RGB convertor to Composite Video encoder
>>that is less than $15,000.00??? 

Yes. There is one advertised for $300 - $400. I think it was in Byte,
but can't be sure. If I remember correctly, it is an ANALOG RGB->NTSC
convertor. A few transistors will convert RGBi -> analog RGB for use
with this device.

>I am also looking for such a device, it seems unfortunate that one
>must buy an Amiga with a genlock device to get real, usable composite
>video.  I am not sure why this is so hard, but their must be a market
>for it.  I have a CGA (with very bad monochrome composite output).
>video card.

Wait a minute - the genlock adaptor is NOT necessary to get composite
video from an Amiga (1000) - it is available at an RCA jack on the rear
of the Amiga (1000). The genlock provides synchronization with an external
video source. I don't know about the 2000.

>Thanks for any info (although I know no one will respond!).
Just to prove you wrong :-)

Elektor Electronics magazine (British), in their _Summer Circuits 86_
issue, gave a simple schematic for a CGA -> monochrome video combiner.
Use this to convert digital video to analog. Use three (modified slightly)
to convert RGBi to analog RGB.
Motorola make the MC1377 composite video encoder. Use this to convert
RGB -> NTSC. We built the circuit from the Motorola application notes
and it works OK. Mail me if you have questions. Flames OK too (help
cut down on my heating bill).

To keep warm in winter, we in the Great White North GET DOWN.

				Regards, Stephen J King.
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