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From: daveh@ccwf.cc.utexas.edu (David H. Huang)
Newsgroups: comp.sys.apple2
Subject: Re: NTSC -> RGB converter
Message-ID: <43274@ut-emx.uucp>
Date: 28 Jan 91 01:10:26 GMT
References: <21012422115088@lax.wisc.edu> <7792@plains.NoDak.edu>
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Reply-To: daveh@ccwf.cc.utexas.edu (David H. Huang)
Organization: The University of Texas at Austin
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In article <7792@plains.NoDak.edu> msuacm@plains.NoDak.edu (MSU ACM Student Chapter) writes:
>Is there any sort of device available that will allow one to transfer
>RGB signals to NTSC signals?  I often record CD's and other forms of music
>onto Hi-Fi Videotape (no tape flips and almost as good as CD) but would
>like to be able to capture a video signal onto onto the unused video tracks.
>A friend of mine has a 386SX (sorry - I have a //e :)  ) but would like
>to add some of those mind-bending pallette-switching tricks to the
>tape just for grins.  I know the resolution isn't as good, but it's worth
>a try.  An interesting trick for you hi-fi freaks with graphics demos
>(zip-chips preferred) is to recording music that way but take the video
>output from your apple running something like Fire Organ.  Anyone
>remember that oldie???
>
>Sorry about this ranting if anyone found it stupid
>Eric Ondler
><msuacm@plains.nodak.edu>

Yes, there is something that will do that... I saw it in another issue
of Radio-Electronics magazine (pretty sure that it's before October 90).
I assume you want to get the RGB off of the 386SX's video card, not the
//e. The only problem is that the RGB signal has to scan at the same rate
as the NTSC signal, and only CGA does that :-(
However, if you mean that you want to get the RGB off of the //e (not too
many people of RGB cards in their //e's), it might be easier to get it from
the composite video output instead.

BTW, I've tried recording the FTA Xmas demo on videotape... it looks OK, but
I think the program is really messing with the VGC or the NTSC generator in
the GS, since there is a line between the graphics screen and the border
and the screen shifts vertically whenever the text starts to scroll in the
border. It looks really nice on the RGB monitor though.

-- 
David Huang                                 |
Internet: daveh@ccwf.cc.utexas.edu          |     "My ganglion is stuck in
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America Online: DrWho29                     |