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From: myers@hpfcdj.HP.COM (Bob Myers)
Newsgroups: sci.electronics
Subject: Re: RGB monitor stuff
Message-ID: <17660081@hpfcdj.HP.COM>
Date: 29 Jun 90 18:38:22 GMT
References: <26898b37@nw.com>
Organization: Hewlett Packard -- Fort Collins, CO
Lines: 16

>After getting a number of replies about how high the scan rate was
>for my video game board, I decided to recheck things on my scope.
>This time I got much nicer results!  Vertical sync was 60Hz and
>Horizontal was 15,750Hz.  Just what NTSC uses.  Now the question is,
>how do I know if the signal is interlaced or not without trying it
>out?  Is there some way to tell?

The method already presented is fine; however, if it's using these 
frequencies, it's almost undoubtedly interlaced.  (15.75 kHz at 60Hz
NON-interlaced would only be about 260 lines).



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.