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From: cabbie@chinet.UUCP (Richard Andrews)
Newsgroups: comp.sys.atari.st
Subject: Re: RGB to video composite for ATARI 1040/Mega ST computer.
Message-ID: <965@chinet.UUCP>
Date: Wed, 6-May-87 23:39:13 EDT
Article-I.D.: chinet.965
Posted: Wed May  6 23:39:13 1987
Date-Received: Sat, 9-May-87 10:17:26 EDT
References: <8705060843.AA21103@cogsci.berkeley.edu>
Reply-To: cabbie@chinet.UUCP (Richard Andrews)
Organization: Chinet - Public Access Unix
Lines: 31


	I did some genlock work on the 520/1040 ST machines and have discovered
the following.

When in external sync mode the 520/1040 does not produce hsync-subcarrier 
locked video.  This causes a color banding effect on the screen.

Depending on the version of GLUE the screen display may be either jumpy,
1/2 black, or 3/4 black when in the extrenal sync mode.

The h-sync is missing equalization pulses, hence, no NTSC standard output.

The composite output of the ST stinks.  There is no delay line in the RGB
to composite coverter (modulator) which causes this.

There are other problems but they can be elimated quite easily.  

In short, unless Atari re-works GLUE or the system clock or both there can
be no genlock.

						Richard Andrews
						Asst. Chief Engineer
						WCFC-TV  Chicago



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Any opinions expressed above are my own.        Rich Andrews
 They can be yours too.  Please send $19.95 to.....ihnp4!chinet!cabbie
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