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From: emmonsl@csusac.uucp (L. Scott Emmons)
Newsgroups: comp.sys.ibm.pc
Subject: Re: PC video interface help needed
Summary: Fun with scan converters!
Keywords: PC, video monitors, interfacing
Message-ID: <1989Jun18.114923.11903@csusac.uucp>
Date: 22 Jul 89 18:49:23 GMT
References: <1547@agora.UUCP>
Organization: California State University, Sacramento
Lines: 36


In article <1547@agora.UUCP>, bob@agora.UUCP (Robert Lucas) writes:
> Has anyone had experience in using large screen (27") televisions
> with direct video inputs as display devices for PC's?

	Yes..we often convert CGA, EGA, and VGA output to NTSC for display
	on projection TVs and other NTSC devices.


> I am working on a project that requires 40 char/line output on
> ganged monitors.  I purchased a Cyber Research 320X200 video output
> card and tried it on a 27' Sylvania monitor, but the characters seem
> to have poor color convergence and a fuzzy/streaky appearance. 

	As we aren't using converter cards, but scan converter frames, I can
	only speculate that the problem is with your scan converter card, and
	not the monitor (they cannot be brain dead...as they have no brain
	to qualify themselves as such).

	Did you:

		1> Make sure that bridged video loops through the monitor are
		terminated with a 75ohm terminator?

		2> Make sure that the scan card is compatable with the
		graphics card output format?  (i.e. a CGA scan converter won't
		work with an EGA or VGA card, except in CGA mode, because the
		scanning frequency is _much_ different).  This doesn't
		generally account for the type of problem you have encountered,
		but it has been known to happen.


	Hope it helps in some way...

		lse
		"No sig's enough sig for me"