Path: utzoo!attcan!uunet!peregrine!elroy!ames!oliveb!sun!pepper!cmcmanis
From: cmcmanis%pepper@Sun.COM (Chuck McManis)
Newsgroups: comp.sys.amiga.tech
Subject: Re: 23 pin video port
Message-ID: <62315@sun.uucp>
Date: 1 Aug 88 21:57:36 GMT
References: <7476@cit-vax.Caltech.Edu>
Sender: news@sun.uucp
Reply-To: cmcmanis@sun.UUCP (Chuck McManis)
Organization: Sun Microsystems, Mountain View
Lines: 16

XCLK stands for eXternal CLocK. and XCLKEN* is an active low enable line.
Basically this lets you run your Amiga from an external clock source (which
you will want to do when Genlocked). Basically, feeding a 28Mhz squarewave
into this and enabling XCLKEN will run your Amiga as though it was running
on the internal clock, you can then however crank this clock up a bit to
get a few more CPU cycles out of it. Note that since the timings inside 
the box are pretty tight running it over 30Mhz will start things to fail.
If you ever wondered what your Amiga would be like running at 14Mhz feed
a 56Mhz clock input in here. [It won't work] And since *everything* is
synchronized to this clock you will have to look out for skewing the NTSC
timings on the video signal. (It would be a good time to have a multisync)


--Chuck McManis
uucp: {anywhere}!sun!cmcmanis   BIX: cmcmanis  ARPAnet: cmcmanis@sun.com
These opinions are my own and no one elses, but you knew that didn't you.