Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!rutgers!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Video Signals
Keywords: RGB, digital, clock signals
Message-ID: <9726@cbmvax.commodore.com>
Date: 19 Feb 90 18:02:59 GMT
References: <9?!#+`-@rpi.edu>
Reply-To: daveh@cbmvax.cbm.commodore.com (Dave Haynie)
Followup-To: comp.sys.amiga.hardware
Organization: Commodore, West Chester, PA
Lines: 22

In article <9?!#+`-@rpi.edu> jvmiller@zeno1.rdrc.rpi.edu (Jim Miller) writes:

>    I am interested in using the digital RGB outputs and I need to
>know if the XCLK*, and XCLKEN* are outputs and if XCLK* is a clock
>running at the pixel rate.  

Both XCLK and XCLKEN* are inputs.  XCLK is an alternate 28.636 (NTSC) system
basis clock, and XCLKEN* switches the multiplexer that directs the system to
use XCLK instead of the internal clock.  Generally this clock is provided by
Genlock devices to slave the Amiga system to an external video signal.

If you're interested in cleanly clocking pixels somehow, you need to talk
with an Amiga Video Wizard of some sort -- that looks a bit like black magic
even to me, though I kinda know what is done (Hedley hires and flickerFixer
do this sort of thing).  I'd recommend Pete Silverstone or Hedley Davis; there
may be a few others who know this stuff, but I wouldn't bet on there being
more than a handful or so.

-- 
Dave Haynie Commodore-Amiga (Systems Engineering) "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: hazy     BIX: hazy
                    Too much of everything is just enough