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From: farren@hoptoad.uucp (Mike Farren)
Newsgroups: comp.sys.amiga
Subject: Re: 14.31818 MHz 68010 Upgrade
Message-ID: <2695@hoptoad.uucp>
Date: Sun, 9-Aug-87 22:06:47 EDT
Article-I.D.: hoptoad.2695
Posted: Sun Aug  9 22:06:47 1987
Date-Received: Mon, 10-Aug-87 04:39:10 EDT
References: <19965@ucbvax.BERKELEY.EDU> <204@dana.UUCP> <942@omepd> <20038@ucbvax.BERKELEY.EDU>
Reply-To: farren@hoptoad.UUCP (Mike Farren)
Distribution: world
Organization: Nebula Consultants in San Francisco
Lines: 20

In article robinson@renoir.Berkeley.EDU.UUCP (Michael Robinson) writes:
[regarding a double speed 68000/10 add-on]
>
>The big win (which many people seem to be overlooking) is that the 68000 and
>68010 only use half the memory bandwidth available (the "every other" 
>phenomenon).  This circuit will hopefully remedy that situation.

The big win isn't quite as big as you might think.  If accesses are being
done to CHIP RAM, the normal arbitration circuitry of the Amiga will lock
out the faster processor during most of those "every other" cycles, anyway.
Only if you are accessing FAST RAM will the full speed-up come into being.
Not that it isn't a good idea, though, but I just don't want people getting
big hopes up, looking for 100% speed improvements, and getting 20%.


-- 
----------------
                 "... if the church put in half the time on covetousness
Mike Farren      that it does on lust, this would be a better world ..."
hoptoad!farren       Garrison Keillor, "Lake Wobegon Days"