Path: utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!wuarchive!psuvax1!rutgers!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Denise generating Hires clock internally?
Message-ID: <14813@cbmvax.commodore.com>
Date: 2 Oct 90 18:47:00 GMT
References: <1990Oct1.064514.27549@funet.fi>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 28

In article <1990Oct1.064514.27549@funet.fi> kp74615@nokikana.tut.fi (Karri Tapani Palovuori) writes:

>I was reading the schematics of my B2000 and noticed that Denise
>only receives 7M (7.09379 MHz - it's PAL, pal) and C1 (3.546895
>MHz) clocks. Are my schematics incomplete or does Denise indeed
>generate Hires clock internally?

Look again.  Pin 34 of Denise gets CDAC*, which is another 7.09379MHz clock,
leading 7M by 90 degrees.

>Does anybody have any suggestions for reading digital RGB
>(12-bit, from internal slots) _synchronously_? Hires?

That is kind of a magic trick.  The RBG signals can be clocked synchronously,
the problem is that there's no built in clock that'll clock them.  So you have
to make your own.  Or something like that.  Outta my league, I'm not the video
slot expert.  Hedley Davis could explain how "Hedley Hires" monitors achieve
this magic, though he doesn't read news all that much.  If you're desparate,
you might try email to hedley@cbmvax.commodore.com.  There are probably one or
two other people in the world who know this trick :-)...

>Karri


-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
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	Standing on the shoulders of giants leaves me cold	-REM