Path: utzoo!utgpu!water!watmath!clyde!bellcore!decvax!decwrl!sun!pepper!cmcmanis
From: cmcmanis%pepper@Sun.COM (Chuck McManis)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Speed-up question
Message-ID: <45023@sun.uucp>
Date: 10 Mar 88 20:29:23 GMT
References: <8803090654.AA04873@cory.Berkeley.EDU> <386@coplex.UUCP>
Sender: news@sun.uucp
Reply-To: cmcmanis@sun.UUCP (Chuck McManis)
Organization: Sun Microsystems, Mountain View
Lines: 23

In article <386@coplex.UUCP> jim@coplex.UUCP (Jim Sewell) writes:
>Any help would be appreciated.  Experiments are so much fun!  Besides, our
>Amiga club would be VERY interested in any positive results we would have.

Jim, the *first* thing you folks should do is spring for a copy of the 
schematics of the machine in question. Perusal of the clock circuit in 
those will show that on the video connector are two lines, XCLK, and 
XCLKENABLE*. Basically, when XCLKENABLE* is grounded your Amiga is running
from the clock coming in on the XCLK pin. You can move the frequency around
on this pin to your hearts delight and change the speed of your system.
Note that the frequency on this pin should be 8*3.58Mhz or about 28Mhz. 

Things to note : 
	a) The video is generated from this clock so you had better have
	   a multisync attached to your machine or you won't be able to
	   see the video.
	b) The time blocks are in the Custom chips and they will crap out
	   at about 30 Mhz. 


--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.