Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!cs.utexas.edu!usc!apple!motcsd!motsj1!mcdchg!att!cbnewsd!njd
From: njd@cbnewsd.ATT.COM (nick.j.dimasi)
Newsgroups: comp.sys.atari.8bit
Subject: Re: Connecting Atari 800 to a video input
Message-ID: <13330@cbnewsd.ATT.COM>
Date: 21 Feb 90 23:55:08 GMT
References: <2045@atari.UUCP>
Reply-To: njd@cbnewsd.ATT.COM (nick.j.dimasi,ix,)
Organization: AT&T Bell Laboratories
Lines: 31

In article <2045@atari.UUCP> jwt@atari.UUCP (Jim Tittsler) writes:
>CURRENTM@CARLETON.EDU (Michael Current) writes:
>
>>In the article <13178@cbnewsd.ATT.COM> Nick DiMasi [me] gives an explanation 
>>of chroma and luma outputs of the Atari XE's.  What I found surprising to read
>>was that the 800 has no split chroma/luma output.
>The 800 does indeed have separate chroma and luminence outputs (on pins 5
>and 1 respectively).  The 400 only provides modulated RF output.
>
>Jim Tittsler, Systems Engineer, Atari Corp

Oops, I goofed on the 800 this time (I don't even have one anymore).  But I'm
pretty sure about the 800XL not having chroma output - at least, that is what
I've read (in this newsgroup among other places), and _my_ 800XL does not
have chroma (unless it comes out on a strange pin - the pinouts for the 800XL
and 130XE are supposed to be the same, except that the chroma signal isn't
really there). 

I'm still looking for the info on the 800XL chroma mod.  (I know I have it on
a tape, but I have yet to try reading that tape over here ...)  If someone
else has it handy, please post/mail it - meanwhile I'll keep looking (at least
one 8-bitter out there asked me for it).  As I recall, it is mostly (if not 
entirely) the addition of a proper resistor between something (a transistor?) 
on the board and the output pin...

Nick DiMasi				Uniq Digital Technologies, Inc.
nick@udt386.chi.il.us (the ".us" might be ".com" instead)  [I'm not there much]
...att!odutsa!njd [I'm on here a lot] | Delphi: TURBONICK
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