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From: myers@hpfcdj.HP.COM (Bob Myers)
Newsgroups: sci.electronics
Subject: Re: RGB monitor stuff
Message-ID: <17660080@hpfcdj.HP.COM>
Date: 27 Jun 90 18:28:31 GMT
References: <2686d1ca@nw.com>
Organization: Hewlett Packard -- Fort Collins, CO
Lines: 25

>Hi.  I recently bought a p.c.board set for the arcade game Defender and I'm 
>trying to get it hooked up but I don't know much about color tv workings.
>I'd like to hook it up to a color tv (thru the composite video input
>on my VCR).  For the video it has the following outputs:
>
>  R, G, and B:  analog, vary from about 0-3vdc
>  Sync signals:  TTL levels
>    Vert. Sync: a 60hz signal (positive pulse about every 17ms, 0.8ms wide)
>    Horiz Sync: a positive pulse about every 18usec, about 2usec wide
>    Composite sync:  combo of H and V

You can't do it.  Assuming that your horiz. sync really does have a period
of 18 us, this board wants a display with a 55.56 kHz horizontal sweep
capability, which is far beyond what conventional televisions do.  You might
be able to run this to one of the newer "multisync" monitors, assuming that
you can get a model which will run on TTL sync and handle this rate.  Off the
top of my head, I'd look at the Mitsubishi line.  You'll also need to attenuate
the video, as most commercially-available monitors expect RS-343 levels -
which give 1V p-p on green and about 0.7V p-p on red and blue.

      

Bob Myers  KC0EW   HP Graphics Tech. Div.|  Opinions expressed here are not
                   Ft. Collins, Colorado |  those of my employer or any other
myers%hpfcla@hplabs.hp.com               |  sentient life-form on this planet.