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From: bradd@gssc.UUCP (Brad Davis)
Newsgroups: comp.sys.att,comp.sys.ibm.pc
Subject: Re: Color Monitor for AT&T 6300+
Summary: be careful - there is more to it than 25 pins and 25KHz
Message-ID: <5509@gssc.UUCP>
Date: 2 Apr 88 02:02:04 GMT
References: <354@lehi3b15.UUCP> <5384@gssc.UUCP> <239@dale.acc.virginia.edu>
Reply-To: bradd@gssc.UUCP (Brad Davis)
Organization: Graphic Software Systems, Beaverton Or
Lines: 36

In article <239@dale.acc.virginia.edu> Galen Hekhuis writes:
>The NEC Multisync can be used quite easily with the 6300 or 6300+, requiring
>only a simple modification of the DB-25 connector to 9 pin connector.  If you 
>want a color monitor, get one that can do 25khz scan rate (multisync or single
>scan rate) and do a simple cable modification (if necessary).  

   Galen is only half right.  With a simple cable modification, you *can*
display your AT&T video on a NEC Multisync.

   But your picture will be a square in the center of the tube, about 9"
across diagonally.  NEC warned me about this, but I was still disappointed
when I saw it.  Usable?  Certainly.  Worth buying a Multisync for?  No way.

   The problem is that the horizontal size can't adjust out far enough
to expand the 640 pixels across to anything near 10".  While 25khz is well
within the Multisync's range, it seems that the horizontal blanking interval
is much higher than NEC considered or was willing to allow for.  Even on
the Nanao (which is the only multisync(tm)-type I know of that advertizes
AT&T compatibility), you must throw a switch on the back of the monitor to
get the horizontal size out far enough.

   This may not be a problem with the Multisync XL, Multisync Plus or even
the Multisync II, but you sure won't like the results on a Multisync I.

   So the moral is: don't assume that a multisync-type (there's alot more
out there than NEC, you know) will handle AT&T/Olivetti just because it can
handle 25KHz and is rated above 640x400.

   Brad Davis

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